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hdc1080.c
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#include "hdc1080.h"
#include "string.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#define HDC1080_ADDRESS 0x40
static nrf_drv_twi_t m_twi;
static void wait_100_ms() {
hdc1080_100ms_timer = 0x00;
while (!hdc1080_100ms_timer) {
if (NRF_LOG_PROCESS() == false) {
nrf_pwr_mgmt_run();
}
}
}
void set_hdc1080_twi_instance(nrf_drv_twi_t twi_instance) {
m_twi = twi_instance;
}
static uint8_t i2c_write8(uint8_t address, uint8_t reg) {
uint16_t timeout = UINT16_MAX;
uint8_t txBuffer = reg;
twi_write_done = 0x00;
twi_read_done = 0x00;
twi_address_nack = 0x00;
ret_code_t result = nrf_drv_twi_tx(&m_twi, address, &txBuffer, 1, false);
if (result == NRF_SUCCESS) {
while (!twi_write_done && --timeout) {
}
if (!timeout || twi_address_nack) {
return 0x00;
} else {
return 0x01;
}
} else {
return 0x00;
}
}
static uint8_t i2c_write_buffer(uint8_t address, uint8_t reg, uint8_t *value,
const uint8_t buffer_size) {
uint16_t timeout = UINT16_MAX;
uint8_t txBuffer[buffer_size + 1];
txBuffer[0] = reg;
memcpy(txBuffer + 1, value, buffer_size);
twi_write_done = 0x00;
twi_read_done = 0x00;
twi_address_nack = 0x00;
ret_code_t result = nrf_drv_twi_tx(&m_twi, address, txBuffer,
sizeof(txBuffer), false);
if (result == NRF_SUCCESS) {
while (!twi_write_done && --timeout) {
}
if (!timeout || twi_address_nack) {
return 0x00;
} else {
return 0x01;
}
} else {
return 0x00;
}
}
static uint8_t i2c_read_buffer(uint8_t address, uint8_t *read_value,
const uint8_t buffer_size) {
uint16_t timeout = UINT16_MAX;
uint8_t rxBuffer[buffer_size];
twi_write_done = 0x00;
twi_read_done = 0x00;
twi_address_nack = 0x00;
ret_code_t result = nrf_drv_twi_rx(&m_twi, address, rxBuffer, buffer_size);
if (result == NRF_SUCCESS) {
while (!twi_write_done && --timeout) {
}
memcpy(read_value, rxBuffer, buffer_size);
if (!timeout || twi_address_nack) {
return 0x00;
} else {
return 0x01;
}
} else {
return 0x00;
}
}
uint8_t init_hdc1080() {
uint8_t i2c_state = 0x00;
uint8_t init_value[2] = { 0x00 };
//Reset
init_value[0] = 0b10000000;
init_value[1] = 0b00000000;
i2c_state = i2c_write_buffer(HDC1080_ADDRESS, 0x02, init_value, 2);
for (uint8_t i = 0; i < 2; i++) {
wait_100_ms();
}
init_value[0] = 0b00010010;
init_value[1] = 0b00000000;
i2c_state = i2c_state
& i2c_write_buffer(HDC1080_ADDRESS, 0x02, init_value, 2);
return i2c_state;
}
uint8_t get_hdc1080_temperature_humidity(int16_t *temperature_output,
uint8_t *humidity_output) {
uint8_t i2c_state = 0x00;
uint8_t read_buffer[4] = { 0x00 };
i2c_state = i2c_write8(HDC1080_ADDRESS, 0x00);
for (uint8_t i = 0; i < 2; i++) {
wait_100_ms();
}
i2c_state = i2c_state & i2c_read_buffer(HDC1080_ADDRESS, read_buffer, 4);
uint16_t value = read_buffer[0] << 8 | read_buffer[1];
float temperature = ((float) value / 65536.0f) * 165.0f - 40.0f;
temperature *= 10;
value = read_buffer[2] << 8 | read_buffer[3];
float humidity = ((float) value / 65536.0f) * 100.0f;
if (humidity > 100) {
humidity = 100;
} else if (humidity < 0) {
humidity = 0;
}
*temperature_output = (int16_t) temperature;
*humidity_output = (uint8_t) humidity;
return i2c_state;
}