2013-04-16 12:44:54 +02:00
|
|
|
/*
|
|
|
|
|
|
|
|
u8g_com_i2c.c
|
|
|
|
|
|
|
|
generic i2c interface
|
|
|
|
|
|
|
|
Universal 8bit Graphics Library
|
|
|
|
|
|
|
|
Copyright (c) 2011, olikraus@gmail.com
|
|
|
|
All rights reserved.
|
|
|
|
|
|
|
|
Redistribution and use in source and binary forms, with or without modification,
|
|
|
|
are permitted provided that the following conditions are met:
|
|
|
|
|
|
|
|
* Redistributions of source code must retain the above copyright notice, this list
|
|
|
|
of conditions and the following disclaimer.
|
|
|
|
|
|
|
|
* Redistributions in binary form must reproduce the above copyright notice, this
|
|
|
|
list of conditions and the following disclaimer in the documentation and/or other
|
|
|
|
materials provided with the distribution.
|
|
|
|
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
|
|
|
|
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
|
|
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
|
|
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
|
|
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
|
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
|
|
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
|
|
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
|
|
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
|
|
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
|
|
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
2015-05-31 20:25:36 +02:00
|
|
|
|
2013-04-16 12:44:54 +02:00
|
|
|
#include "u8g.h"
|
|
|
|
|
2015-05-31 20:25:36 +02:00
|
|
|
//#define U8G_I2C_WITH_NO_ACK
|
2013-04-16 12:44:54 +02:00
|
|
|
|
2015-05-31 20:25:36 +02:00
|
|
|
static uint8_t u8g_i2c_err_code;
|
|
|
|
static uint8_t u8g_i2c_opt; /* U8G_I2C_OPT_NO_ACK, SAM: U8G_I2C_OPT_DEV_1 */
|
2013-04-16 12:44:54 +02:00
|
|
|
/*
|
|
|
|
position values
|
|
|
|
1: start condition
|
|
|
|
2: sla transfer
|
|
|
|
*/
|
|
|
|
static uint8_t u8g_i2c_err_pos;
|
|
|
|
|
|
|
|
|
|
|
|
void u8g_i2c_clear_error(void)
|
|
|
|
{
|
|
|
|
u8g_i2c_err_code = U8G_I2C_ERR_NONE;
|
|
|
|
u8g_i2c_err_pos = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_get_error(void)
|
|
|
|
{
|
|
|
|
return u8g_i2c_err_code;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_get_err_pos(void)
|
|
|
|
{
|
|
|
|
return u8g_i2c_err_pos;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void u8g_i2c_set_error(uint8_t code, uint8_t pos)
|
|
|
|
{
|
|
|
|
if ( u8g_i2c_err_code > 0 )
|
|
|
|
return;
|
|
|
|
u8g_i2c_err_code |= code;
|
|
|
|
u8g_i2c_err_pos = pos;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#if defined(__AVR__)
|
|
|
|
#define U8G_ATMEGA_HW_TWI
|
|
|
|
|
|
|
|
/* remove the definition for attiny */
|
|
|
|
#if __AVR_ARCH__ == 2
|
|
|
|
#undef U8G_ATMEGA_HW_TWI
|
|
|
|
#endif
|
|
|
|
#if __AVR_ARCH__ == 25
|
|
|
|
#undef U8G_ATMEGA_HW_TWI
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(U8G_ATMEGA_HW_TWI)
|
|
|
|
|
|
|
|
#include <avr/io.h>
|
|
|
|
#include <util/twi.h>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void u8g_i2c_init(uint8_t options)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
TWBR: bit rate register
|
|
|
|
TWSR: status register (contains preselector bits)
|
|
|
|
|
|
|
|
prescalar
|
|
|
|
0 1
|
|
|
|
1 4
|
|
|
|
2 16
|
|
|
|
3 64
|
|
|
|
|
|
|
|
f = F_CPU/(16+2*TWBR*prescalar)
|
|
|
|
|
|
|
|
F_CPU = 16MHz
|
|
|
|
TWBR = 152;
|
|
|
|
TWSR = 0;
|
|
|
|
--> 50KHz
|
|
|
|
|
|
|
|
TWBR = 72;
|
|
|
|
TWSR = 0;
|
|
|
|
--> 100KHz
|
|
|
|
|
2015-05-31 20:25:36 +02:00
|
|
|
TWBR = 12;
|
|
|
|
TWSR = 0;
|
|
|
|
--> 400KHz
|
|
|
|
|
2013-04-16 12:44:54 +02:00
|
|
|
F_CPU/(2*100000)-8 --> calculate TWBR value for 100KHz
|
|
|
|
*/
|
2015-05-31 20:25:36 +02:00
|
|
|
u8g_i2c_opt = options;
|
2013-04-16 12:44:54 +02:00
|
|
|
TWSR = 0;
|
2015-05-31 20:25:36 +02:00
|
|
|
if ( options & U8G_I2C_OPT_FAST )
|
|
|
|
{
|
|
|
|
TWBR = F_CPU/(2*400000)-8;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
TWBR = F_CPU/(2*100000)-8;
|
|
|
|
}
|
2013-04-16 12:44:54 +02:00
|
|
|
u8g_i2c_clear_error();
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_wait(uint8_t mask, uint8_t pos)
|
|
|
|
{
|
|
|
|
volatile uint16_t cnt = 2000; /* timout value should be > 280 for 50KHz Bus and 16 Mhz CPU, however the start condition might need longer */
|
|
|
|
while( !(TWCR & mask) )
|
|
|
|
{
|
|
|
|
if ( cnt == 0 )
|
|
|
|
{
|
2015-05-31 20:25:36 +02:00
|
|
|
if ( u8g_i2c_opt & U8G_I2C_OPT_NO_ACK )
|
|
|
|
{
|
|
|
|
return 1; /* all ok */
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
u8g_i2c_set_error(U8G_I2C_ERR_TIMEOUT, pos);
|
|
|
|
return 0; /* error */
|
|
|
|
}
|
2013-04-16 12:44:54 +02:00
|
|
|
}
|
|
|
|
cnt--;
|
|
|
|
}
|
|
|
|
return 1; /* all ok */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* sla includes all 8 bits (with r/w bit), assums master transmit */
|
|
|
|
uint8_t u8g_i2c_start(uint8_t sla)
|
|
|
|
{
|
|
|
|
register uint8_t status;
|
|
|
|
|
|
|
|
/* send start */
|
|
|
|
TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
|
|
|
|
|
|
|
|
/* wait */
|
|
|
|
if ( u8g_i2c_wait(_BV(TWINT), 1) == 0 )
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
status = TW_STATUS;
|
|
|
|
|
|
|
|
/* check status after start */
|
|
|
|
if ( status != TW_START && status != TW_REP_START )
|
|
|
|
{
|
|
|
|
u8g_i2c_set_error(U8G_I2C_ERR_BUS, 1);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* set slave address */
|
|
|
|
TWDR = sla;
|
|
|
|
|
|
|
|
/* enable sla transfer */
|
|
|
|
TWCR = _BV(TWINT) | _BV(TWEN);
|
|
|
|
|
|
|
|
/* wait */
|
|
|
|
if ( u8g_i2c_wait(_BV(TWINT), 2) == 0 )
|
|
|
|
return 0;
|
|
|
|
|
2015-05-31 20:25:36 +02:00
|
|
|
if ( u8g_i2c_opt & U8G_I2C_OPT_NO_ACK )
|
2013-04-16 12:44:54 +02:00
|
|
|
{
|
2015-05-31 20:25:36 +02:00
|
|
|
/* do not check for ACK */
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
status = TW_STATUS;
|
|
|
|
/* check status after sla */
|
|
|
|
if ( status != TW_MT_SLA_ACK )
|
|
|
|
{
|
|
|
|
u8g_i2c_set_error(U8G_I2C_ERR_BUS, 2);
|
|
|
|
return 0;
|
|
|
|
}
|
2013-04-16 12:44:54 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_send_byte(uint8_t data)
|
|
|
|
{
|
|
|
|
register uint8_t status;
|
|
|
|
TWDR = data;
|
|
|
|
TWCR = _BV(TWINT) | _BV(TWEN);
|
|
|
|
if ( u8g_i2c_wait(_BV(TWINT), 3) == 0 )
|
|
|
|
return 0;
|
2015-05-31 20:25:36 +02:00
|
|
|
|
|
|
|
if ( u8g_i2c_opt & U8G_I2C_OPT_NO_ACK )
|
2013-04-16 12:44:54 +02:00
|
|
|
{
|
2015-05-31 20:25:36 +02:00
|
|
|
/* do not check for ACK */
|
2013-04-16 12:44:54 +02:00
|
|
|
}
|
2015-05-31 20:25:36 +02:00
|
|
|
else
|
|
|
|
{
|
|
|
|
status = TW_STATUS;
|
|
|
|
if ( status != TW_MT_DATA_ACK )
|
|
|
|
{
|
|
|
|
u8g_i2c_set_error(U8G_I2C_ERR_BUS, 3);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-04-16 12:44:54 +02:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void u8g_i2c_stop(void)
|
|
|
|
{
|
|
|
|
/* write stop */
|
|
|
|
TWCR = _BV(TWINT) | _BV(TWEN) | _BV(TWSTO);
|
|
|
|
|
|
|
|
/* no error is checked for the stop condition */
|
|
|
|
u8g_i2c_wait(_BV(TWSTO), 4);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
void twi_send(uint8_t adr, uint8_t data1, uint8_t data2)
|
|
|
|
{
|
|
|
|
u8g_i2c_start(adr<<1);
|
|
|
|
u8g_i2c_send_byte(data1);
|
|
|
|
u8g_i2c_send_byte(data2);
|
|
|
|
u8g_i2c_stop();
|
|
|
|
}
|
|
|
|
*/
|
|
|
|
|
2015-05-31 20:25:36 +02:00
|
|
|
#elif defined(ARDUINO) && defined(__SAM3X8E__)
|
|
|
|
/* Arduino Due */
|
|
|
|
#include "Arduino.h"
|
|
|
|
#include "sam.h"
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
|
|
|
Controller
|
|
|
|
|
|
|
|
TWI0 TWCK0 PA18 A DUE PCB: SCL1
|
|
|
|
TWI0 TWD0 PA17 A DUE PCB: SDA1
|
|
|
|
TWI1 TWCK1 PB13 A DUE PCB: SCL 21
|
|
|
|
TWI1 TWD1 PB12 A DUE PCB: SDA 20
|
|
|
|
|
|
|
|
Arduino definitions
|
|
|
|
|
|
|
|
#define PIN_WIRE_SDA (20u)
|
|
|
|
#define PIN_WIRE_SCL (21u)
|
|
|
|
#define WIRE_INTERFACE TWI1
|
|
|
|
#define WIRE_INTERFACE_ID ID_TWI1
|
|
|
|
#define WIRE_ISR_HANDLER TWI1_Handler
|
|
|
|
|
|
|
|
#define PIN_WIRE1_SDA (70u)
|
|
|
|
#define PIN_WIRE1_SCL (71u)
|
|
|
|
#define WIRE1_INTERFACE TWI0
|
|
|
|
#define WIRE1_INTERFACE_ID ID_TWI0
|
|
|
|
#define WIRE1_ISR_HANDLER TWI0_Handler
|
|
|
|
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void i2c_400KHz_delay(void)
|
|
|
|
{
|
|
|
|
/* should be at least 4 */
|
|
|
|
/* should be 5 for 100KHz transfer speed */
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
Arduino Due
|
|
|
|
0x NOP: 470KHz
|
|
|
|
4x NOP: 450KHz
|
|
|
|
8x NOP: 430KHz
|
|
|
|
16x NOP: 400KHz
|
|
|
|
*/
|
|
|
|
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void i2c_100KHz_delay(void)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
1x u8g_MicroDelay() ca. 130KHz
|
|
|
|
2x u8g_MicroDelay() ca. 80KHz
|
|
|
|
*/
|
|
|
|
u8g_MicroDelay();
|
|
|
|
u8g_MicroDelay();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
uint32_t i2c_started = 0;
|
|
|
|
uint32_t i2c_scl_pin = 0;
|
|
|
|
uint32_t i2c_sda_pin = 0;
|
|
|
|
void (*i2c_delay)(void) = i2c_100KHz_delay;
|
|
|
|
|
|
|
|
const PinDescription *i2c_scl_pin_desc;
|
|
|
|
const PinDescription *i2c_sda_pin_desc;
|
|
|
|
|
|
|
|
|
|
|
|
/* maybe this can be optimized */
|
|
|
|
static void i2c_init(void)
|
|
|
|
{
|
|
|
|
i2c_sda_pin_desc = &(g_APinDescription[i2c_sda_pin]);
|
|
|
|
i2c_scl_pin_desc = &(g_APinDescription[i2c_scl_pin]);
|
|
|
|
pinMode(i2c_sda_pin, OUTPUT);
|
|
|
|
digitalWrite(i2c_sda_pin, HIGH);
|
|
|
|
pinMode(i2c_scl_pin, OUTPUT);
|
|
|
|
digitalWrite(i2c_scl_pin, HIGH);
|
|
|
|
PIO_Configure( i2c_sda_pin_desc->pPort, PIO_OUTPUT_0, i2c_sda_pin_desc->ulPin, PIO_OPENDRAIN );
|
|
|
|
PIO_Configure( i2c_scl_pin_desc->pPort, PIO_OUTPUT_0, i2c_scl_pin_desc->ulPin, PIO_OPENDRAIN );
|
|
|
|
PIO_Clear( i2c_sda_pin_desc->pPort, i2c_sda_pin_desc->ulPin) ;
|
|
|
|
PIO_Clear( i2c_scl_pin_desc->pPort, i2c_scl_pin_desc->ulPin) ;
|
|
|
|
PIO_Configure( i2c_sda_pin_desc->pPort, PIO_INPUT, i2c_sda_pin_desc->ulPin, PIO_DEFAULT ) ;
|
|
|
|
PIO_Configure( i2c_scl_pin_desc->pPort, PIO_INPUT, i2c_scl_pin_desc->ulPin, PIO_DEFAULT ) ;
|
|
|
|
i2c_delay();
|
|
|
|
}
|
|
|
|
|
|
|
|
/* actually, the scl line is not observed, so this procedure does not return a value */
|
|
|
|
static void i2c_read_scl_and_delay(void)
|
|
|
|
{
|
|
|
|
uint32_t dwMask = i2c_scl_pin_desc->ulPin;
|
|
|
|
//PIO_Configure( i2c_scl_pin_desc->pPort, PIO_INPUT, i2c_scl_pin_desc->ulPin, PIO_DEFAULT ) ;
|
|
|
|
//PIO_SetInput( i2c_scl_pin_desc->pPort, i2c_scl_pin_desc->ulPin, PIO_DEFAULT ) ;
|
|
|
|
|
|
|
|
/* set as input */
|
|
|
|
i2c_scl_pin_desc->pPort->PIO_ODR = dwMask ;
|
|
|
|
i2c_scl_pin_desc->pPort->PIO_PER = dwMask ;
|
|
|
|
|
|
|
|
i2c_delay();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void i2c_clear_scl(void)
|
|
|
|
{
|
|
|
|
uint32_t dwMask = i2c_scl_pin_desc->ulPin;
|
|
|
|
|
|
|
|
/* set open collector and drive low */
|
|
|
|
//PIO_Configure( i2c_scl_pin_desc->pPort, PIO_OUTPUT_0, i2c_scl_pin_desc->ulPin, PIO_OPENDRAIN );
|
|
|
|
//PIO_SetOutput( i2c_scl_pin_desc->pPort, i2c_scl_pin_desc->ulPin, 0, 1, 0);
|
|
|
|
|
|
|
|
/* open drain, zero default output */
|
|
|
|
i2c_scl_pin_desc->pPort->PIO_MDER = dwMask;
|
|
|
|
i2c_scl_pin_desc->pPort->PIO_CODR = dwMask;
|
|
|
|
i2c_scl_pin_desc->pPort->PIO_OER = dwMask;
|
|
|
|
i2c_scl_pin_desc->pPort->PIO_PER = dwMask;
|
|
|
|
|
|
|
|
//PIO_Clear( i2c_scl_pin_desc->pPort, i2c_scl_pin_desc->ulPin) ;
|
|
|
|
}
|
|
|
|
|
|
|
|
static uint8_t i2c_read_sda(void)
|
|
|
|
{
|
|
|
|
uint32_t dwMask = i2c_sda_pin_desc->ulPin;
|
|
|
|
//PIO_Configure( i2c_sda_pin_desc->pPort, PIO_INPUT, i2c_sda_pin_desc->ulPin, PIO_DEFAULT ) ;
|
|
|
|
//PIO_SetInput( i2c_sda_pin_desc->pPort, i2c_sda_pin_desc->ulPin, PIO_DEFAULT ) ;
|
|
|
|
|
|
|
|
/* set as input */
|
|
|
|
i2c_sda_pin_desc->pPort->PIO_ODR = dwMask ;
|
|
|
|
i2c_sda_pin_desc->pPort->PIO_PER = dwMask ;
|
|
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void i2c_clear_sda(void)
|
|
|
|
{
|
|
|
|
uint32_t dwMask = i2c_sda_pin_desc->ulPin;
|
|
|
|
|
|
|
|
/* set open collector and drive low */
|
|
|
|
//PIO_Configure( i2c_sda_pin_desc->pPort, PIO_OUTPUT_0, i2c_sda_pin_desc->ulPin, PIO_OPENDRAIN );
|
|
|
|
//PIO_SetOutput( i2c_sda_pin_desc->pPort, i2c_sda_pin_desc->ulPin, 0, 1, 0);
|
|
|
|
|
|
|
|
/* open drain, zero default output */
|
|
|
|
i2c_sda_pin_desc->pPort->PIO_MDER = dwMask ;
|
|
|
|
i2c_sda_pin_desc->pPort->PIO_CODR = dwMask ;
|
|
|
|
i2c_sda_pin_desc->pPort->PIO_OER = dwMask ;
|
|
|
|
i2c_sda_pin_desc->pPort->PIO_PER = dwMask ;
|
|
|
|
|
|
|
|
//PIO_Clear( i2c_sda_pin_desc->pPort, i2c_sda_pin_desc->ulPin) ;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void i2c_start(void)
|
|
|
|
{
|
|
|
|
if ( i2c_started != 0 )
|
|
|
|
{
|
|
|
|
/* if already started: do restart */
|
|
|
|
i2c_read_sda(); /* SDA = 1 */
|
|
|
|
i2c_delay();
|
|
|
|
i2c_read_scl_and_delay();
|
|
|
|
}
|
|
|
|
i2c_read_sda();
|
|
|
|
/*
|
|
|
|
if (i2c_read_sda() == 0)
|
|
|
|
{
|
|
|
|
// do something because arbitration is lost
|
|
|
|
}
|
|
|
|
*/
|
|
|
|
/* send the start condition, both lines go from 1 to 0 */
|
|
|
|
i2c_clear_sda();
|
|
|
|
i2c_delay();
|
|
|
|
i2c_clear_scl();
|
|
|
|
i2c_started = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void i2c_stop(void)
|
|
|
|
{
|
|
|
|
/* set SDA to 0 */
|
|
|
|
i2c_clear_sda();
|
|
|
|
i2c_delay();
|
|
|
|
|
|
|
|
/* now release all lines */
|
|
|
|
i2c_read_scl_and_delay();
|
|
|
|
|
|
|
|
/* set SDA to 1 */
|
|
|
|
i2c_read_sda();
|
|
|
|
i2c_delay();
|
|
|
|
i2c_started = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void i2c_write_bit(uint8_t val)
|
|
|
|
{
|
|
|
|
if (val)
|
|
|
|
i2c_read_sda();
|
|
|
|
else
|
|
|
|
i2c_clear_sda();
|
|
|
|
|
|
|
|
i2c_delay();
|
|
|
|
i2c_read_scl_and_delay();
|
|
|
|
i2c_clear_scl();
|
|
|
|
}
|
|
|
|
|
|
|
|
static uint8_t i2c_read_bit(void)
|
|
|
|
{
|
|
|
|
uint8_t val;
|
|
|
|
/* do not drive SDA */
|
|
|
|
i2c_read_sda();
|
|
|
|
i2c_delay();
|
|
|
|
i2c_read_scl_and_delay();
|
|
|
|
val = i2c_read_sda();
|
|
|
|
i2c_delay();
|
|
|
|
i2c_clear_scl();
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
|
|
|
|
static uint8_t i2c_write_byte(uint8_t b)
|
|
|
|
{
|
|
|
|
i2c_write_bit(b & 128);
|
|
|
|
i2c_write_bit(b & 64);
|
|
|
|
i2c_write_bit(b & 32);
|
|
|
|
i2c_write_bit(b & 16);
|
|
|
|
i2c_write_bit(b & 8);
|
|
|
|
i2c_write_bit(b & 4);
|
|
|
|
i2c_write_bit(b & 2);
|
|
|
|
i2c_write_bit(b & 1);
|
|
|
|
|
|
|
|
/* read ack from client */
|
|
|
|
/* 0: ack was given by client */
|
|
|
|
/* 1: nothing happend during ack cycle */
|
|
|
|
return i2c_read_bit();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void u8g_i2c_init(uint8_t options)
|
|
|
|
{
|
|
|
|
u8g_i2c_opt = options;
|
|
|
|
u8g_i2c_clear_error();
|
|
|
|
|
|
|
|
if ( u8g_i2c_opt & U8G_I2C_OPT_FAST )
|
|
|
|
{
|
|
|
|
i2c_delay = i2c_400KHz_delay;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
i2c_delay = i2c_100KHz_delay;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if ( u8g_i2c_opt & U8G_I2C_OPT_DEV_1 )
|
|
|
|
{
|
|
|
|
i2c_scl_pin = PIN_WIRE1_SCL;
|
|
|
|
i2c_sda_pin = PIN_WIRE1_SDA;
|
|
|
|
|
|
|
|
//REG_PIOA_PDR = PIO_PB12A_TWD1 | PIO_PB13A_TWCK1;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
|
|
|
|
i2c_scl_pin = PIN_WIRE_SCL;
|
|
|
|
i2c_sda_pin = PIN_WIRE_SDA;
|
|
|
|
|
|
|
|
//REG_PIOA_PDR = PIO_PA17A_TWD0 | PIO_PA18A_TWCK0;
|
|
|
|
}
|
|
|
|
|
|
|
|
i2c_init();
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/* sla includes also the r/w bit */
|
|
|
|
uint8_t u8g_i2c_start(uint8_t sla)
|
|
|
|
{
|
|
|
|
i2c_start();
|
|
|
|
i2c_write_byte(sla);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_send_byte(uint8_t data)
|
|
|
|
{
|
|
|
|
return i2c_write_byte(data);
|
|
|
|
}
|
|
|
|
|
|
|
|
void u8g_i2c_stop(void)
|
|
|
|
{
|
|
|
|
i2c_stop();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
#elif defined(U8G_RASPBERRY_PI)
|
|
|
|
|
|
|
|
#include <wiringPi.h>
|
|
|
|
#include <wiringPiI2C.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <errno.h>
|
|
|
|
|
|
|
|
#define I2C_SLA 0x3c
|
|
|
|
|
|
|
|
static int fd=-1;
|
|
|
|
static uint8_t i2cMode = 0;
|
|
|
|
|
|
|
|
void u8g_i2c_init(uint8_t options) {
|
|
|
|
u8g_i2c_clear_error();
|
|
|
|
u8g_i2c_opt = options;
|
|
|
|
|
|
|
|
if (wiringPiSetup() == -1) {
|
|
|
|
printf("wiringPi-Error\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
fd = wiringPiI2CSetup(I2C_SLA);
|
|
|
|
if (fd < 0) {
|
|
|
|
printf ("Unable to open I2C device 0: %s\n", strerror (errno)) ;
|
|
|
|
exit (1) ;
|
|
|
|
}
|
|
|
|
//u8g_SetPIOutput(u8g, U8G_PI_RESET);
|
|
|
|
//u8g_SetPIOutput(u8g, U8G_PI_A0);
|
|
|
|
}
|
|
|
|
uint8_t u8g_i2c_start(uint8_t sla) {
|
|
|
|
u8g_i2c_send_mode(0);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void u8g_i2c_stop(void) {
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_send_mode(uint8_t mode) {
|
|
|
|
i2cMode = mode;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_send_byte(uint8_t data) {
|
|
|
|
wiringPiI2CWriteReg8(fd, i2cMode, data);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_wait(uint8_t mask, uint8_t pos)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2013-04-16 12:44:54 +02:00
|
|
|
#else
|
|
|
|
|
|
|
|
/* empty interface */
|
|
|
|
|
|
|
|
void u8g_i2c_init(uint8_t options)
|
|
|
|
{
|
|
|
|
u8g_i2c_clear_error();
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_wait(uint8_t mask, uint8_t pos)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_start(uint8_t sla)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
uint8_t u8g_i2c_send_byte(uint8_t data)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void u8g_i2c_stop(void)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|