mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-10-31 18:04:31 +00:00
241 lines
6.2 KiB
C
241 lines
6.2 KiB
C
/*
|
|
* Copyright (c) 2010, Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* i2c core functions
|
|
* \author
|
|
* Robert Olsson <robert@radio-sensors.com>
|
|
*/
|
|
|
|
#include <avr/pgmspace.h>
|
|
#include <avr/pgmspace.h>
|
|
#include <avr/sleep.h>
|
|
#include <avr/wdt.h>
|
|
#include "dev/watchdog.h"
|
|
#include "contiki.h"
|
|
#include "i2c.h"
|
|
#include <compat/twi.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "dev/co2_sa_kxx-sensor.h"
|
|
|
|
void
|
|
i2c_init(uint32_t speed)
|
|
{
|
|
/* initialize TWI clock: 100 kHz clock, TWPS = 0 => prescaler = 1 */
|
|
|
|
TWSR = 0; /* no prescaler */
|
|
TWBR = ((F_CPU / speed) - 16) / 2; /* must be > 10 for stable operation */
|
|
}
|
|
uint8_t
|
|
i2c_start(uint8_t addr)
|
|
{
|
|
uint8_t twst;
|
|
uint32_t n;
|
|
|
|
/* Send START condition */
|
|
TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
|
|
|
|
/* Wait until transmission completed */
|
|
for(n = 0; n < 100000 && !(TWCR & (1 << TWINT)); n++) {
|
|
}
|
|
if(n >= 100000) {
|
|
return 1;
|
|
}
|
|
|
|
/* check value of TWI Status Register. Mask prescaler bits. */
|
|
twst = TW_STATUS & 0xF8;
|
|
if((twst != TW_START) && (twst != TW_REP_START)) {
|
|
return 1;
|
|
}
|
|
|
|
/* send device address */
|
|
TWDR = addr;
|
|
TWCR = (1 << TWINT) | (1 << TWEN);
|
|
|
|
/* wail until transmission completed and ACK/NACK has been received */
|
|
for(n = 0; n < 100000 && !(TWCR & (1 << TWINT)); n++) {
|
|
}
|
|
if(n >= 100000) {
|
|
return 1;
|
|
}
|
|
|
|
/* check value of TWI Status Register. Mask prescaler bits. */
|
|
twst = TW_STATUS & 0xF8;
|
|
if((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
void
|
|
i2c_start_wait(uint8_t addr)
|
|
{
|
|
uint8_t twst;
|
|
while ( 1 )
|
|
{
|
|
// send START condition
|
|
TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
|
|
// wait until transmission completed
|
|
while(!(TWCR & (1<<TWINT)));
|
|
// check value of TWI Status Register. Mask prescaler bits.
|
|
twst = TW_STATUS & 0xF8;
|
|
if ( (twst != TW_START) && (twst != TW_REP_START)) continue;
|
|
// send device address
|
|
TWDR = addr;
|
|
TWCR = (1<<TWINT) | (1<<TWEN);
|
|
// wail until transmission completed
|
|
while(!(TWCR & (1<<TWINT)));
|
|
// check value of TWI Status Register. Mask prescaler bits.
|
|
twst = TW_STATUS & 0xF8;
|
|
if ( (twst == TW_MT_SLA_NACK )||(twst ==TW_MR_DATA_NACK) )
|
|
{
|
|
/* device busy, send stop condition to terminate write operation */
|
|
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
|
|
// wait until stop condition is executed and bus released
|
|
while(TWCR & (1<<TWSTO));
|
|
continue;
|
|
}
|
|
//if( twst != TW_MT_SLA_ACK) return 1;
|
|
break;
|
|
}
|
|
}
|
|
void
|
|
i2c_stop(void)
|
|
{
|
|
TWCR = (1 << TWINT) | (1 << TWSTO) | (1 << TWEN);
|
|
/* wait until ready */
|
|
while(TWCR & (1<<TWSTO));
|
|
}
|
|
void
|
|
i2c_write(uint8_t u8data)
|
|
{
|
|
TWDR = u8data;
|
|
TWCR = (1 << TWINT) | (1 << TWEN);
|
|
while((TWCR & (1 << TWINT)) == 0) ;
|
|
}
|
|
uint8_t
|
|
i2c_readAck(void)
|
|
{
|
|
TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA);
|
|
while((TWCR & (1 << TWINT)) == 0) ;
|
|
return TWDR;
|
|
}
|
|
uint8_t
|
|
i2c_readNak(void)
|
|
{
|
|
TWCR = (1 << TWINT) | (1 << TWEN);
|
|
while((TWCR & (1 << TWINT)) == 0) ;
|
|
return TWDR;
|
|
}
|
|
static void
|
|
print_delim(int p, char *s, const char *d)
|
|
{
|
|
if(p) {
|
|
printf("%s", d);
|
|
}
|
|
printf("%s", s);
|
|
}
|
|
void
|
|
i2c_write_mem(uint8_t addr, uint8_t reg, uint8_t value)
|
|
{
|
|
i2c_start(addr | I2C_WRITE);
|
|
i2c_write(reg);
|
|
i2c_write(value);
|
|
i2c_stop();
|
|
}
|
|
void
|
|
i2c_read_mem(uint8_t addr, uint8_t reg, uint8_t buf[], uint8_t bytes)
|
|
{
|
|
uint8_t i = 0;
|
|
i2c_start(addr | I2C_WRITE);
|
|
i2c_write(reg);
|
|
i2c_start(addr | I2C_READ);
|
|
for(i = 0; i < bytes; i++) {
|
|
if(i == bytes - 1) {
|
|
buf[i] = i2c_readNak();
|
|
} else {
|
|
buf[i] = i2c_readAck();
|
|
}
|
|
}
|
|
i2c_stop();
|
|
}
|
|
void
|
|
i2c_at24mac_read(char *buf, uint8_t eui64)
|
|
{
|
|
if(eui64) {
|
|
i2c_read_mem(I2C_AT24MAC_ADDR, 0x98, (uint8_t *)buf, 8);
|
|
}
|
|
/* 128bit unique serial number */
|
|
else {
|
|
i2c_read_mem(I2C_AT24MAC_ADDR, 0x80, (uint8_t *)buf, 16);
|
|
}
|
|
}
|
|
|
|
uint16_t
|
|
i2c_probe(void)
|
|
{
|
|
int p = 0;
|
|
const char *del = ",";
|
|
uint16_t probed = 0;
|
|
watchdog_periodic();
|
|
if(!i2c_start(I2C_AT24MAC_ADDR)) {
|
|
i2c_stop();
|
|
probed |= I2C_AT24MAC;
|
|
print_delim(p++, "AT24MAC", del);
|
|
}
|
|
watchdog_periodic();
|
|
if(!i2c_start(I2C_SHT2X_ADDR)) {
|
|
i2c_stop();
|
|
probed |= I2C_SHT2X;
|
|
print_delim(p++, "SHT2X", del);
|
|
}
|
|
watchdog_periodic();
|
|
if(!i2c_start(I2C_CO2SA_ADDR)) {
|
|
i2c_stop();
|
|
probed |= I2C_CO2SA;
|
|
print_delim(p++, "CO2SA", del);
|
|
}
|
|
watchdog_periodic();
|
|
if(!i2c_start(I2C_BME280_ADDR)) {
|
|
i2c_stop();
|
|
probed |= I2C_BME280;
|
|
print_delim(p++, "BME280", del);
|
|
}
|
|
watchdog_periodic();
|
|
if(!i2c_start(I2C_PMS5003_ADDR)) {
|
|
i2c_stop();
|
|
probed |= I2C_PMS5003;
|
|
print_delim(p++, "PMS5003", del);
|
|
}
|
|
return probed;
|
|
}
|