LCD Fonctionnel
This commit is contained in:
arnaud.houdelette
parent
044633f59d
commit
a75b521dce
8 changed files with 576 additions and 186 deletions
16
Makefile
16
Makefile
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@ -46,7 +46,7 @@
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# $Id$
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# $Id$
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#Bootloader Port
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#Bootloader Port
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PORT = /dev/ttyU0
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PORT = /dev/serial/by-id/usb-Arduino__www.arduino.cc__Arduino_Mega_2560_6493534363335111A032-if00
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# /dev/serial/by-id/usb-Arduino_LLC_Arduino_Micro-if00
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# /dev/serial/by-id/usb-Arduino_LLC_Arduino_Micro-if00
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#Device Port (for autoreset)
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#Device Port (for autoreset)
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RESETPORT = /dev/ttyU0
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RESETPORT = /dev/ttyU0
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@ -54,11 +54,11 @@ RESETPORT = /dev/ttyU0
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TARGET = pyrorf
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TARGET = pyrorf
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SRC = main.c i2c.c lcd.c
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SRC = main.c lcd.c
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CXXSRC =
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CXXSRC =
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ASRC =
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ASRC = i2cmaster.S
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MCU = atmega32
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MCU = atmega2560
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F_CPU = 8000000L
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F_CPU = 16000000UL
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FORMAT = ihex
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FORMAT = ihex
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UPLOAD_RATE = 20000
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UPLOAD_RATE = 20000
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@ -98,10 +98,10 @@ LDFLAGS = -lm -Wl,--gc-sections
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# Programming support using avrdude. Settings and variables.
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# Programming support using avrdude. Settings and variables.
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AVRDUDE_PROGRAMMER = linuxspi
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AVRDUDE_PROGRAMMER = stk500
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AVRDUDE_PORT = /dev/spidev0.0
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AVRDUDE_PORT = $(PORT)
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AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex:i
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AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex:i
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AVRDUDE_FLAGS = -F -pattiny84 -P$(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER) -b $(UPLOAD_RATE)
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AVRDUDE_FLAGS = -F -p m2560 -P$(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER) -b $(UPLOAD_RATE)
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# Program settings
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# Program settings
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CC = avr-gcc
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CC = avr-gcc
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115
i2c.c
115
i2c.c
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@ -1,115 +0,0 @@
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#include "i2c.h"
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#include <util/delay.h>
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void i2c_init(void)
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{
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i2c_sda_hi();
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i2c_scl_hi();
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_delay_us(i2cbitdelay);
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}
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void i2c_writebit( uint8_t c )
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{
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if ( c > 0 ) {
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i2c_sda_hi();
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} else {
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i2c_sda_lo();
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}
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i2c_scl_hi();
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_delay_us(i2cbitdelay);
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i2c_scl_lo();
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_delay_us(i2cbitdelay);
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if ( c > 0 ) {
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i2c_sda_lo();
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}
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_delay_us(i2cbitdelay);
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}
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uint8_t i2c_readbit(void)
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{
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i2c_sda_hi();
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i2c_scl_hi();
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_delay_us(i2cbitdelay);
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uint8_t c = bitRead( SDAPORT,SDAPIN);
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i2c_scl_lo();
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_delay_us(i2cbitdelay);
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return c ? 1 : 0;
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}
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void i2c_start(void)
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{
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i2c_sda_hi();
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i2c_scl_hi();
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_delay_us(i2cbitdelay);
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i2c_sda_lo();
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_delay_us(i2cbitdelay);
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i2c_scl_lo();
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_delay_us(i2cbitdelay);
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}
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void i2c_repstart(void)
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{
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i2c_sda_hi();
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i2c_scl_hi();
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i2c_scl_lo(); // force SCL low
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_delay_us(i2cbitdelay);
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i2c_sda_release(); // release SDA
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_delay_us(i2cbitdelay);
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i2c_scl_release(); // release SCL
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_delay_us(i2cbitdelay);
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i2c_sda_lo(); // force SDA low
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_delay_us(i2cbitdelay);
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}
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void i2c_stop(void)
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{
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i2c_scl_hi();
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_delay_us(i2cbitdelay);
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i2c_sda_hi();
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_delay_us(i2cbitdelay);
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}
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uint8_t i2c_write( uint8_t c )
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{
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for ( uint8_t i=0;i<8;i++) {
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i2c_writebit( c & 128 );
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c<<=1;
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}
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return i2c_readbit();
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}
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uint8_t i2c_read( uint8_t ack )
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{
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uint8_t res = 0;
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for ( uint8_t i=0;i<8;i++) {
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res <<= 1;
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res |= i2c_readbit();
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}
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if ( ack )
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i2c_writebit( 0 );
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else
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i2c_writebit( 1 );
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_delay_us(i2cbitdelay);
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return res;
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}
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45
i2c.h
45
i2c.h
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@ -1,45 +0,0 @@
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#ifndef defines_i2c
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#define defines_i2c
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#include <avr/io.h>
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#include "defines.h"
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#define i2cbitdelay 50
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#define I2C_ACK 1
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#define I2C_NAK 0
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#define SCLPORT PORTD
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#define SDAPORT PORTD
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#define SDAPIN 7
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#define SCLPIN 8
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#define SCLDDR DDRD
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#define SDADDR DDRD
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#define i2c_scl_release() bitClear(SCLDDR,SCLPIN);
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#define i2c_sda_release() bitClear(SDADDR,SDAPIN);
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// sets SCL low and drives output
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#define i2c_scl_lo() bitClear(SCLPORT,SCLPIN); bitSet(SCLDDR,SCLPIN);
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// sets SDA low and drives output
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#define i2c_sda_lo() bitClear(SDAPORT,SCLPIN); bitSet(SDADDR,SDAPIN);
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// set SCL high and to input (releases pin) (i.e. change to input,turnon pullup)
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#define i2c_scl_hi() bitClear(SCLDDR,SCLPIN);bitSet(SCLPORT,SCLPIN);
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// set SDA high and to input (releases pin) (i.e. change to input,turnon pullup)
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#define i2c_sda_hi() bitClear(SDADDR,SDAPIN);bitSet(SDAPORT,SDAPIN);
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void i2c_init(void);
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void i2c_writebit( uint8_t c );
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uint8_t i2c_readbit(void);
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void i2c_start(void);
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void i2c_repstart(void);
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void i2c_stop(void);
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uint8_t i2c_write( uint8_t c );
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uint8_t i2c_read( uint8_t ack );
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#endif
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359
i2cmaster.S
Normal file
359
i2cmaster.S
Normal file
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;*************************************************************************
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; Title : I2C (Single) Master Implementation
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; Author: Peter Fleury <pfleury@gmx.ch>
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; based on Atmel Appl. Note AVR300
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; File: $Id: i2cmaster.S,v 1.13 2015/09/16 11:21:00 peter Exp $
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; Software: AVR-GCC 4.x
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; Target: any AVR device
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;
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; DESCRIPTION
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; Basic routines for communicating with I2C slave devices. This
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; "single" master implementation is limited to one bus master on the
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; I2C bus.
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;
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; Based on the Atmel Application Note AVR300, corrected and adapted
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; to GNU assembler and AVR-GCC C call interface
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; Replaced the incorrect quarter period delays found in AVR300 with
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; half period delays.
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;
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; USAGE
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; These routines can be called from C, refere to file i2cmaster.h.
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; See example test_i2cmaster.c
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; Adapt the SCL and SDA port and pin definitions and eventually
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; the delay routine to your target !
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; Use 4.7k pull-up resistor on the SDA and SCL pin.
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;
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; NOTES
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; The I2C routines can be called either from non-interrupt or
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; interrupt routines, not both.
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;
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;*************************************************************************
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#include <avr/io.h>
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#undef SCL_PORT
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#undef SCL_DDR
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;******----- Adapt these SCA and SCL port and pin definition to your target !!
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;
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#define SDA 1 // SDA Port D, Pin 1
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#define SCL 0 // SCL Port D, Pin 0
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#define SDA_PORT PORTD // SDA Port D
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#define SCL_PORT PORTD // SCL Port D
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;******----------------------------------------------------------------------
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;-- map the IO register back into the IO address space
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#define SDA_DDR (_SFR_IO_ADDR(SDA_PORT) - 1)
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#define SCL_DDR (_SFR_IO_ADDR(SCL_PORT) - 1)
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#define SDA_OUT _SFR_IO_ADDR(SDA_PORT)
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#define SCL_OUT _SFR_IO_ADDR(SCL_PORT)
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#define SDA_IN (_SFR_IO_ADDR(SDA_PORT) - 2)
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#define SCL_IN (_SFR_IO_ADDR(SCL_PORT) - 2)
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#ifndef __tmp_reg__
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#define __tmp_reg__ 0
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#endif
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.section .text
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;*************************************************************************
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; delay half period
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; For I2C in normal mode (100kHz), use T/2 > 5us
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; For I2C in fast mode (400kHz), use T/2 > 1.25us
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;*************************************************************************
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.stabs "",100,0,0,i2c_delay_T2
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.stabs "i2cmaster.S",100,0,0,i2c_delay_T2
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.func i2c_delay_T2 ; delay 5.0 microsec with 4 Mhz crystal
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i2c_delay_T2: ; 3 cycles
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#if F_CPU <= 4000000UL
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rjmp 1f ; 2 "
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1: rjmp 2f ; 2 "
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2: rjmp 3f ; 2 "
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3: rjmp 4f ; 2 "
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4: rjmp 5f ; 2 "
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5: rjmp 6f ; 2 "
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6: nop ; 1 "
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ret ; 4 " total 20 cyles = 5.0 microsec with 4 Mhz crystal
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#elif F_CPU <= 8000000UL
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push r24 ; 2 cycle
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ldi r24, 7 ; 1 cycle
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nop ; 1 cycle
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1: sbiw r24, 1 ; 2 cycle
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brne 1b ; 2 or 1 cycle, 4 cycles per loop
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pop r24 ; 2 ycle
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ret ; 4 cycle = total 60 cycles = 5.0 microsec with 12 Mhz crystal
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#elif F_CPU <= 12000000UL
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push r24 ; 2 cycle
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ldi r24, 12 ; 1 cycle
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nop ; 1 cycle
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1: sbiw r24, 1 ; 2 cycle
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brne 1b ; 2 or 1 cycle, 4 cycles per loop
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pop r24 ; 2 ycle
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ret ; 4 cycle = total 60 cycles = 5.0 microsec with 12 Mhz crystal
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#elif F_CPU <= 16000000UL
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push r24 ; 2 cycle
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ldi r24, 17 ; 1 cycle
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nop ; 1 cycle
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1: sbiw r24, 1 ; 2 cycle
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brne 1b ; 2 or 1 cycle, 4 cycles per loop
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pop r24 ; 2 ycle
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ret ; 4 cycle = total 80 cycles = 5.0 microsec with 16 Mhz crystal
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#else
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push r24 ; 2 cycle
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ldi r24, 22 ; 1 cycle
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nop ; 1 cycle
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1: sbiw r24, 1 ; 2 cycle
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brne 1b ; 2 or 1 cycle, 4 cycles per loop
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pop r24 ; 2 ycle
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ret ; 4 cycle = total 100 cycles = 5.0 microsec with 20 Mhz crystal
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#endif
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.endfunc ;
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;*************************************************************************
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; Initialization of the I2C bus interface. Need to be called only once
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;
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; extern void i2c_init(void)
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;*************************************************************************
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.global i2c_init
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.func i2c_init
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i2c_init:
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cbi SDA_DDR,SDA ;release SDA
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sbi SCL_DDR,SCL ;release SCL
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cbi SDA_OUT,SDA
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sbi SCL_OUT,SCL
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ret
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.endfunc
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;*************************************************************************
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; Issues a start condition and sends address and transfer direction.
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; return 0 = device accessible, 1= failed to access device
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;
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; extern unsigned char i2c_start(unsigned char addr);
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; addr = r24, return = r25(=0):r24
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;*************************************************************************
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.global i2c_start
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.func i2c_start
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i2c_start:
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cbi SDA_OUT,SDA
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sbi SDA_DDR,SDA ;force SDA low
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rcall i2c_delay_T2 ;delay T/2
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rcall i2c_write ;write address
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ret
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.endfunc
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;*************************************************************************
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; Issues a repeated start condition and sends address and transfer direction.
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; return 0 = device accessible, 1= failed to access device
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;
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; extern unsigned char i2c_rep_start(unsigned char addr);
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; addr = r24, return = r25(=0):r24
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;*************************************************************************
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.global i2c_rep_start
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.func i2c_rep_start
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i2c_rep_start:
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cbi SCL_OUT,SCL
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sbi SCL_DDR,SCL ;force SCL low
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rcall i2c_delay_T2 ;delay T/2
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cbi SDA_DDR,SDA ;release SDA
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sbi SDA_OUT,SDA
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rcall i2c_delay_T2 ;delay T/2
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cbi SCL_DDR,SCL ;release SCL
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sbi SCL_OUT,SCL
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rcall i2c_delay_T2 ;delay T/2
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cbi SDA_OUT,SDA
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sbi SDA_DDR,SDA ;force SDA low
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rcall i2c_delay_T2 ;delay T/2
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rcall i2c_write ;write address
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|
ret
|
||||||
|
.endfunc
|
||||||
|
|
||||||
|
|
||||||
|
;*************************************************************************
|
||||||
|
; Issues a start condition and sends address and transfer direction.
|
||||||
|
; If device is busy, use ack polling to wait until device is ready
|
||||||
|
;
|
||||||
|
; extern void i2c_start_wait(unsigned char addr);
|
||||||
|
; addr = r24
|
||||||
|
;*************************************************************************
|
||||||
|
|
||||||
|
.global i2c_start_wait
|
||||||
|
.func i2c_start_wait
|
||||||
|
i2c_start_wait:
|
||||||
|
mov __tmp_reg__,r24
|
||||||
|
i2c_start_wait1:
|
||||||
|
cbi SDA_OUT,SDA
|
||||||
|
sbi SDA_DDR,SDA ;force SDA low
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
mov r24,__tmp_reg__
|
||||||
|
rcall i2c_write ;write address
|
||||||
|
tst r24 ;if device not busy -> done
|
||||||
|
breq i2c_start_wait_done
|
||||||
|
rcall i2c_stop ;terminate write operation
|
||||||
|
rjmp i2c_start_wait1 ;device busy, poll ack again
|
||||||
|
i2c_start_wait_done:
|
||||||
|
ret
|
||||||
|
.endfunc
|
||||||
|
|
||||||
|
|
||||||
|
;*************************************************************************
|
||||||
|
; Terminates the data transfer and releases the I2C bus
|
||||||
|
;
|
||||||
|
; extern void i2c_stop(void)
|
||||||
|
;*************************************************************************
|
||||||
|
|
||||||
|
.global i2c_stop
|
||||||
|
.func i2c_stop
|
||||||
|
i2c_stop:
|
||||||
|
cbi SCL_OUT,SCL
|
||||||
|
sbi SCL_DDR,SCL ;force SCL low
|
||||||
|
cbi SDA_OUT,SDA
|
||||||
|
sbi SDA_DDR,SDA ;force SDA low
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
cbi SCL_DDR,SCL ;release SCL
|
||||||
|
sbi SCL_OUT,SCL
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
cbi SDA_DDR,SDA ;release SDA
|
||||||
|
sbi SDA_OUT,SDA
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
ret
|
||||||
|
.endfunc
|
||||||
|
|
||||||
|
|
||||||
|
;*************************************************************************
|
||||||
|
; Send one byte to I2C device
|
||||||
|
; return 0 = write successful, 1 = write failed
|
||||||
|
;
|
||||||
|
; extern unsigned char i2c_write( unsigned char data );
|
||||||
|
; data = r24, return = r25(=0):r24
|
||||||
|
;*************************************************************************
|
||||||
|
.global i2c_write
|
||||||
|
.func i2c_write
|
||||||
|
i2c_write:
|
||||||
|
sec ;set carry flag
|
||||||
|
rol r24 ;shift in carry and out bit one
|
||||||
|
rjmp i2c_write_first
|
||||||
|
i2c_write_bit:
|
||||||
|
lsl r24 ;if transmit register empty
|
||||||
|
i2c_write_first:
|
||||||
|
breq i2c_get_ack
|
||||||
|
cbi SCL_OUT,SCL
|
||||||
|
sbi SCL_DDR,SCL ;force SCL low
|
||||||
|
brcc i2c_write_low
|
||||||
|
nop
|
||||||
|
cbi SDA_DDR,SDA ;release SDA
|
||||||
|
sbi SDA_OUT,SDA
|
||||||
|
rjmp i2c_write_high
|
||||||
|
i2c_write_low:
|
||||||
|
cbi SDA_OUT,SDA
|
||||||
|
sbi SDA_DDR,SDA ;force SDA low
|
||||||
|
rjmp i2c_write_high
|
||||||
|
i2c_write_high:
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
cbi SCL_DDR,SCL ;release SCL
|
||||||
|
sbi SCL_OUT,SCL
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
rjmp i2c_write_bit
|
||||||
|
|
||||||
|
i2c_get_ack:
|
||||||
|
cbi SCL_OUT,SCL
|
||||||
|
sbi SCL_DDR,SCL ;force SCL low
|
||||||
|
cbi SDA_DDR,SDA ;release SDA
|
||||||
|
sbi SDA_OUT,SDA
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
cbi SCL_DDR,SCL ;release SCL
|
||||||
|
sbi SCL_OUT,SCL
|
||||||
|
i2c_ack_wait:
|
||||||
|
sbis SCL_IN,SCL ;wait SCL high (in case wait states are inserted)
|
||||||
|
rjmp i2c_ack_wait
|
||||||
|
|
||||||
|
clr r24 ;return 0
|
||||||
|
sbic SDA_IN,SDA ;if SDA high -> return 1
|
||||||
|
ldi r24,1
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
clr r25
|
||||||
|
ret
|
||||||
|
.endfunc
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
;*************************************************************************
|
||||||
|
; read one byte from the I2C device, send ack or nak to device
|
||||||
|
; (ack=1, send ack, request more data from device
|
||||||
|
; ack=0, send nak, read is followed by a stop condition)
|
||||||
|
;
|
||||||
|
; extern unsigned char i2c_read(unsigned char ack);
|
||||||
|
; ack = r24, return = r25(=0):r24
|
||||||
|
; extern unsigned char i2c_readAck(void);
|
||||||
|
; extern unsigned char i2c_readNak(void);
|
||||||
|
; return = r25(=0):r24
|
||||||
|
;*************************************************************************
|
||||||
|
.global i2c_readAck
|
||||||
|
.global i2c_readNak
|
||||||
|
.global i2c_read
|
||||||
|
.func i2c_read
|
||||||
|
i2c_readNak:
|
||||||
|
clr r24
|
||||||
|
rjmp i2c_read
|
||||||
|
i2c_readAck:
|
||||||
|
ldi r24,0x01
|
||||||
|
i2c_read:
|
||||||
|
ldi r23,0x01 ;data = 0x01
|
||||||
|
i2c_read_bit:
|
||||||
|
cbi SCL_OUT,SCL
|
||||||
|
sbi SCL_DDR,SCL ;force SCL low
|
||||||
|
cbi SDA_DDR,SDA ;release SDA (from previous ACK)
|
||||||
|
sbi SDA_OUT,SDA
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
|
||||||
|
cbi SCL_DDR,SCL ;release SCL
|
||||||
|
sbi SCL_OUT,SCL
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
|
||||||
|
i2c_read_stretch:
|
||||||
|
sbis SCL_IN, SCL ;loop until SCL is high (allow slave to stretch SCL)
|
||||||
|
rjmp i2c_read_stretch
|
||||||
|
|
||||||
|
clc ;clear carry flag
|
||||||
|
sbic SDA_IN,SDA ;if SDA is high
|
||||||
|
sec ; set carry flag
|
||||||
|
|
||||||
|
rol r23 ;store bit
|
||||||
|
brcc i2c_read_bit ;while receive register not full
|
||||||
|
|
||||||
|
i2c_put_ack:
|
||||||
|
cbi SCL_OUT,SCL
|
||||||
|
sbi SCL_DDR,SCL ;force SCL low
|
||||||
|
cpi r24,1
|
||||||
|
breq i2c_put_ack_low ;if (ack=0)
|
||||||
|
cbi SDA_DDR,SDA ; release SDA
|
||||||
|
sbi SCL_OUT,SCL
|
||||||
|
rjmp i2c_put_ack_high
|
||||||
|
i2c_put_ack_low: ;else
|
||||||
|
cbi SDA_OUT,SDA
|
||||||
|
sbi SDA_DDR,SDA ; force SDA low
|
||||||
|
i2c_put_ack_high:
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
cbi SCL_DDR,SCL ;release SCL
|
||||||
|
sbi SCL_OUT,SCL
|
||||||
|
i2c_put_ack_wait:
|
||||||
|
sbis SCL_IN,SCL ;wait SCL high
|
||||||
|
rjmp i2c_put_ack_wait
|
||||||
|
rcall i2c_delay_T2 ;delay T/2
|
||||||
|
mov r24,r23
|
||||||
|
clr r25
|
||||||
|
ret
|
||||||
|
.endfunc
|
||||||
|
|
||||||
178
i2cmaster.h
Normal file
178
i2cmaster.h
Normal file
|
|
@ -0,0 +1,178 @@
|
||||||
|
#ifndef _I2CMASTER_H
|
||||||
|
#define _I2CMASTER_H
|
||||||
|
/*************************************************************************
|
||||||
|
* Title: C include file for the I2C master interface
|
||||||
|
* (i2cmaster.S or twimaster.c)
|
||||||
|
* Author: Peter Fleury <pfleury@gmx.ch>
|
||||||
|
* File: $Id: i2cmaster.h,v 1.12 2015/09/16 09:27:58 peter Exp $
|
||||||
|
* Software: AVR-GCC 4.x
|
||||||
|
* Target: any AVR device
|
||||||
|
* Usage: see Doxygen manual
|
||||||
|
**************************************************************************/
|
||||||
|
|
||||||
|
/**
|
||||||
|
@file
|
||||||
|
@defgroup pfleury_ic2master I2C Master library
|
||||||
|
@code #include <i2cmaster.h> @endcode
|
||||||
|
|
||||||
|
@brief I2C (TWI) Master Software Library
|
||||||
|
|
||||||
|
Basic routines for communicating with I2C slave devices. This single master
|
||||||
|
implementation is limited to one bus master on the I2C bus.
|
||||||
|
|
||||||
|
This I2c library is implemented as a compact assembler software implementation of the I2C protocol
|
||||||
|
which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c).
|
||||||
|
Since the API for these two implementations is exactly the same, an application can be linked either against the
|
||||||
|
software I2C implementation or the hardware I2C implementation.
|
||||||
|
|
||||||
|
Use 4.7k pull-up resistor on the SDA and SCL pin.
|
||||||
|
|
||||||
|
Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module
|
||||||
|
i2cmaster.S to your target when using the software I2C implementation !
|
||||||
|
|
||||||
|
Adjust the CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.
|
||||||
|
|
||||||
|
@note
|
||||||
|
The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted
|
||||||
|
to GNU assembler and AVR-GCC C call interface.
|
||||||
|
Replaced the incorrect quarter period delays found in AVR300 with
|
||||||
|
half period delays.
|
||||||
|
|
||||||
|
@author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
|
||||||
|
@copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
|
||||||
|
|
||||||
|
@par API Usage Example
|
||||||
|
The following code shows typical usage of this library, see example test_i2cmaster.c
|
||||||
|
|
||||||
|
@code
|
||||||
|
|
||||||
|
#include <i2cmaster.h>
|
||||||
|
|
||||||
|
|
||||||
|
#define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet
|
||||||
|
|
||||||
|
int main(void)
|
||||||
|
{
|
||||||
|
unsigned char ret;
|
||||||
|
|
||||||
|
i2c_init(); // initialize I2C library
|
||||||
|
|
||||||
|
// write 0x75 to EEPROM address 5 (Byte Write)
|
||||||
|
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
|
||||||
|
i2c_write(0x05); // write address = 5
|
||||||
|
i2c_write(0x75); // write value 0x75 to EEPROM
|
||||||
|
i2c_stop(); // set stop conditon = release bus
|
||||||
|
|
||||||
|
|
||||||
|
// read previously written value back from EEPROM address 5
|
||||||
|
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
|
||||||
|
|
||||||
|
i2c_write(0x05); // write address = 5
|
||||||
|
i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode
|
||||||
|
|
||||||
|
ret = i2c_readNak(); // read one byte from EEPROM
|
||||||
|
i2c_stop();
|
||||||
|
|
||||||
|
for(;;);
|
||||||
|
}
|
||||||
|
@endcode
|
||||||
|
|
||||||
|
*/
|
||||||
|
|
||||||
|
|
||||||
|
/**@{*/
|
||||||
|
|
||||||
|
#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
|
||||||
|
#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#include <avr/io.h>
|
||||||
|
|
||||||
|
/** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
|
||||||
|
#define I2C_READ 1
|
||||||
|
|
||||||
|
/** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
|
||||||
|
#define I2C_WRITE 0
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief initialize the I2C master interace. Need to be called only once
|
||||||
|
@return none
|
||||||
|
*/
|
||||||
|
extern void i2c_init(void);
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief Terminates the data transfer and releases the I2C bus
|
||||||
|
@return none
|
||||||
|
*/
|
||||||
|
extern void i2c_stop(void);
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief Issues a start condition and sends address and transfer direction
|
||||||
|
|
||||||
|
@param addr address and transfer direction of I2C device
|
||||||
|
@retval 0 device accessible
|
||||||
|
@retval 1 failed to access device
|
||||||
|
*/
|
||||||
|
extern unsigned char i2c_start(unsigned char addr);
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief Issues a repeated start condition and sends address and transfer direction
|
||||||
|
|
||||||
|
@param addr address and transfer direction of I2C device
|
||||||
|
@retval 0 device accessible
|
||||||
|
@retval 1 failed to access device
|
||||||
|
*/
|
||||||
|
extern unsigned char i2c_rep_start(unsigned char addr);
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief Issues a start condition and sends address and transfer direction
|
||||||
|
|
||||||
|
If device is busy, use ack polling to wait until device ready
|
||||||
|
@param addr address and transfer direction of I2C device
|
||||||
|
@return none
|
||||||
|
*/
|
||||||
|
extern void i2c_start_wait(unsigned char addr);
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief Send one byte to I2C device
|
||||||
|
@param data byte to be transfered
|
||||||
|
@retval 0 write successful
|
||||||
|
@retval 1 write failed
|
||||||
|
*/
|
||||||
|
extern unsigned char i2c_write(unsigned char data);
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief read one byte from the I2C device, request more data from device
|
||||||
|
@return byte read from I2C device
|
||||||
|
*/
|
||||||
|
extern unsigned char i2c_readAck(void);
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief read one byte from the I2C device, read is followed by a stop condition
|
||||||
|
@return byte read from I2C device
|
||||||
|
*/
|
||||||
|
extern unsigned char i2c_readNak(void);
|
||||||
|
|
||||||
|
/**
|
||||||
|
@brief read one byte from the I2C device
|
||||||
|
|
||||||
|
Implemented as a macro, which calls either @ref i2c_readAck or @ref i2c_readNak
|
||||||
|
|
||||||
|
@param ack 1 send ack, request more data from device<br>
|
||||||
|
0 send nak, read is followed by a stop condition
|
||||||
|
@return byte read from I2C device
|
||||||
|
*/
|
||||||
|
extern unsigned char i2c_read(unsigned char ack);
|
||||||
|
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
/**@}*/
|
||||||
|
#endif
|
||||||
26
lcd.c
26
lcd.c
|
|
@ -1,7 +1,7 @@
|
||||||
#include "lcd.h"
|
#include "lcd.h"
|
||||||
#include "i2c.h"
|
|
||||||
#include <util/delay.h>
|
#include <util/delay.h>
|
||||||
#include <avr/pgmspace.h>
|
#include <avr/pgmspace.h>
|
||||||
|
#include "defines.h"
|
||||||
|
|
||||||
#define ENPIN 0
|
#define ENPIN 0
|
||||||
#define RWPIN 1
|
#define RWPIN 1
|
||||||
|
|
@ -13,19 +13,18 @@
|
||||||
|
|
||||||
uint8_t _numlines;
|
uint8_t _numlines;
|
||||||
uint8_t _cols;
|
uint8_t _cols;
|
||||||
uint8_t _En = (1<<ENPIN);
|
uint8_t _En = 0x04;
|
||||||
uint8_t _Rs = (1<<RSPIN);
|
uint8_t _Rs = 0x01;
|
||||||
uint8_t _Rw = (1<<RWPIN);
|
uint8_t _Rw = 0x02;
|
||||||
uint8_t _Bl = (1<<BLPIN);
|
uint8_t _Bl = 0x08;
|
||||||
|
|
||||||
uint8_t _BackliteOn = true;
|
uint8_t _BackliteOn = false;
|
||||||
|
|
||||||
uint8_t _displaymode;
|
uint8_t _displaymode;
|
||||||
uint8_t _displaycontrol;
|
uint8_t _displaycontrol;
|
||||||
|
|
||||||
void i2csend(uint8_t data){
|
void i2csend(uint8_t data){
|
||||||
i2c_start();
|
i2c_start(0x27<<1);
|
||||||
i2c_write(LCD_ADDRESS << 1);
|
|
||||||
i2c_write(data);
|
i2c_write(data);
|
||||||
i2c_stop();
|
i2c_stop();
|
||||||
}
|
}
|
||||||
|
|
@ -33,12 +32,12 @@ void i2csend(uint8_t data){
|
||||||
void pulseEnable (uint8_t data)
|
void pulseEnable (uint8_t data)
|
||||||
{
|
{
|
||||||
i2csend (data | _En); // En HIGH
|
i2csend (data | _En); // En HIGH
|
||||||
i2csend (data & ~_En); // En LOW
|
i2csend (data); // En LOW
|
||||||
}
|
}
|
||||||
|
|
||||||
void write4bits ( uint8_t value, uint8_t mode )
|
void write4bits ( uint8_t value, uint8_t mode )
|
||||||
{
|
{
|
||||||
uint8_t data = value << DATASHIFT;
|
uint8_t data = value << 4;
|
||||||
|
|
||||||
// Is it a command or data
|
// Is it a command or data
|
||||||
// -----------------------
|
// -----------------------
|
||||||
|
|
@ -80,7 +79,6 @@ void lcd_init(uint8_t cols, uint8_t lines)
|
||||||
_cols=cols;
|
_cols=cols;
|
||||||
_numlines=lines;
|
_numlines=lines;
|
||||||
_delay_ms(100);
|
_delay_ms(100);
|
||||||
|
|
||||||
// this is according to the hitachi HD44780 datasheet
|
// this is according to the hitachi HD44780 datasheet
|
||||||
// figure 24, pg 46
|
// figure 24, pg 46
|
||||||
|
|
||||||
|
|
@ -102,7 +100,7 @@ void lcd_init(uint8_t cols, uint8_t lines)
|
||||||
_delay_us(150); // wait min of 100us
|
_delay_us(150); // wait min of 100us
|
||||||
|
|
||||||
|
|
||||||
command(LCD_FUNCTIONSET | LCD_2LINE);
|
command(LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE);
|
||||||
}
|
}
|
||||||
|
|
||||||
void lcd_clear()
|
void lcd_clear()
|
||||||
|
|
@ -250,3 +248,7 @@ void lcd_write(uint8_t value)
|
||||||
{
|
{
|
||||||
send(value, LCD_DATA);
|
send(value, LCD_DATA);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
void lcd_backlight(uint8_t value){
|
||||||
|
_BackliteOn = value?1:0;
|
||||||
|
}
|
||||||
|
|
|
||||||
4
lcd.h
4
lcd.h
|
|
@ -4,7 +4,7 @@
|
||||||
#include <stdlib.h>
|
#include <stdlib.h>
|
||||||
#include <stdbool.h>
|
#include <stdbool.h>
|
||||||
#include <stdio.h>
|
#include <stdio.h>
|
||||||
#include "i2c.h"
|
#include "i2cmaster.h"
|
||||||
|
|
||||||
// LCD Commands
|
// LCD Commands
|
||||||
// ---------------------------------------------------------------------------
|
// ---------------------------------------------------------------------------
|
||||||
|
|
@ -59,7 +59,7 @@
|
||||||
|
|
||||||
#define HOME_CLEAR_EXEC 2000
|
#define HOME_CLEAR_EXEC 2000
|
||||||
|
|
||||||
#define LCD_ADDRESS 0x37
|
#define LCD_ADDRESS 0x27
|
||||||
|
|
||||||
void lcd_init(uint8_t cols, uint8_t lines);
|
void lcd_init(uint8_t cols, uint8_t lines);
|
||||||
void lcd_clear();
|
void lcd_clear();
|
||||||
|
|
|
||||||
19
main.c
19
main.c
|
|
@ -15,14 +15,25 @@
|
||||||
|
|
||||||
|
|
||||||
void lcdprint( char* ptr){
|
void lcdprint( char* ptr){
|
||||||
while (*ptr) lcd_write(*ptr);
|
while (*ptr) lcd_write(*ptr++);
|
||||||
}
|
}
|
||||||
|
|
||||||
int main(void)
|
int main(void)
|
||||||
{
|
{
|
||||||
|
bitSet(DDRB,7);
|
||||||
lcd_init(20,4);
|
lcd_init(20,4);
|
||||||
|
lcd_clear();
|
||||||
|
_delay_ms(1000);
|
||||||
lcd_home();
|
lcd_home();
|
||||||
lcdprint("Hello World");
|
lcd_display();
|
||||||
lcd_setCursor ( 0, 1 );
|
lcdprint("PyRO RF !");
|
||||||
lcdprint("Hello Me");
|
lcd_setCursor(0,3);
|
||||||
|
lcdprint("Arnaud HOUDELETTE");
|
||||||
|
_delay_ms(3000);
|
||||||
|
lcd_backlight(1);
|
||||||
|
lcd_display();
|
||||||
|
while (1){
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue