int8_t bmp085_read_calibration_data(uint8_t *cdata) {
uint8_t data[] = {BMP085_ADDRESS_WRITE, BMP085_REG_CAL_START};
/* Set I2C driver to normal mode */
if(i2c_set_mode(I2C_MODE_NORMAL) != I2C_OK) {
return BMP085_ERROR_MODE_CHANGE;
}
/* Write module address, control register address and control register data */
if(i2c_write_bytes(data, 2, true, false) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Send read */
data[0] = BMP085_ADDRESS_READ;
if(i2c_write_bytes(data, 1, true, false) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Read 22 bytes */
if(i2c_read_bytes(cdata, 22, false, true) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Swap endianess to make correct values */
for(data[0] = 0; data[0] < 11; data[0]++) {
data[1] = cdata[data[0] * 2 + 1];
cdata[data[0] * 2 + 1] = cdata[data[0] * 2];
cdata[data[0] * 2] = data[1];
}
return BMP085_OK;
}
/*
void i2C0_IRQHandler (void)
{
if (Chip_I2C_IsMasterActive(I2C0)) {
Chip_I2C_MasterStateHandler(I2C0);
}
else {
Chip_I2C_SlaveStateHandler(I2C0);
}
}
*/
void Board_I2C_Master_Init(void)
{
Board_I2C_Init(I2C0);
/* Initialize I2C */
Chip_I2C_Init(I2C0);
Chip_I2C_SetClockRate(I2C0, 100000);
/* Set default mode to poll */
i2c_set_mode(I2C0, 1);
}
/* Initialize the I2C bus */
static void i2c_app_init(I2C_ID_T id, int speed)
{
Init_I2C_PinMux();
/* Initialize I2C */
Chip_I2C_Init(id);
Chip_I2C_SetClockRate(id, speed);
/* Set default mode to interrupt */
i2c_set_mode(id, 0);
}
int8_t bmp085_read_temperature(uint16_t *p_temp) {
uint8_t data[] = {BMP085_ADDRESS_WRITE, BMP085_REG_CONTROL, BMP085_CREG_TEMP};
/* Set I2C driver to normal mode */
if(i2c_set_mode(I2C_MODE_NORMAL) != I2C_OK) {
return BMP085_ERROR_MODE_CHANGE;
}
/* Write module address, control register address and control register data */
if(i2c_write_bytes(data, 3, true, true) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Wait for conversion complete (max time = 4.5ms) */
_delay_ms(5);
/* Set register to MSB */
data[0] = BMP085_ADDRESS_WRITE;
data[1] = BMP085_REG_MSB;
if(i2c_write_bytes(data, 2, true, false) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Send read */
data[0] = BMP085_ADDRESS_READ;
if(i2c_write_bytes(data, 1, true, false) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Read MSB and LSB */
if(i2c_read_bytes(data, 2, false, true) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Align bytes to little endian */
*p_temp = ((uint16_t)data[0] << 8) | ((uint16_t)data[1]);
return BMP085_OK;
}
int8_t bmp085_read_pressure(uint32_t *p_pr, bmp085_oss_t oss) {
/* Set I2C driver to normal mode */
if(i2c_set_mode(I2C_MODE_NORMAL) != I2C_OK) {
return BMP085_ERROR_MODE_CHANGE;
}
/* Write module address, control register address and control register data */
uint8_t data[] = {BMP085_ADDRESS_WRITE, BMP085_REG_CONTROL, 0};
/* Control register value depends on oss */
data[2] = BMP085_CREG_PRESS | (uint8_t)oss << 6;
/* Write module address, control register address and control register data */
if(i2c_write_bytes(data, 3, true, true) != I2C_OK) {
return BMP085_ERROR_I2C;
}
#if 0
/* Wait for conversion complete (depends on oss) */
switch(oss) {
case bmp085_oss_0:
_delay_ms(5);
break;
case bmp085_oss_1:
_delay_ms(8);
break;
case bmp085_oss_2:
_delay_ms(14);
break;
case bmp085_oss_3:
default:
_delay_ms(26);
break;
}
#endif
#if 0
/* This takes over 800 bytes of space! */
_delay_ms(2 + (3 << ((uint8_t)oss)));
#endif
/* Save some flash and always wait enough */
_delay_ms(26);
/* Set register to MSB */
data[0] = BMP085_ADDRESS_WRITE;
data[1] = BMP085_REG_MSB;
if(i2c_write_bytes(data, 2, true, false) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Send read */
data[0] = BMP085_ADDRESS_READ;
if(i2c_write_bytes(data, 1, true, false) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Read MSB, LSB and XLSB */
if(i2c_read_bytes(data, 3, false, true) != I2C_OK) {
return BMP085_ERROR_I2C;
}
/* Align bytes to little endian */
*p_pr = 0;
*p_pr = (((uint32_t)data[0] << 16) | ((uint32_t)data[1] << 8) | (uint32_t)data[2]) >> (8-oss);
return BMP085_OK;
}
