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max30101.c
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max30101.c
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#include "max30101.h"
#include "string.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#define MAX30101_ADDRESS 0x57
#define MAX30102_IR_POWER 45
#define MAX30102_RED_POWER 45
#define MAX30102_GREEN_POWER 125
static nrf_drv_twi_t m_twi;
static void wait_100_ms() {
max30101_100_ms_timer = 0x00;
while (!max30101_100_ms_timer) {
if (NRF_LOG_PROCESS() == false) {
nrf_pwr_mgmt_run();
}
}
}
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, true);
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_write16(uint8_t address, uint8_t reg, uint8_t value) {
uint16_t timeout = UINT16_MAX;
uint8_t txBuffer[2] = { 0x00 };
txBuffer[0] = reg;
txBuffer[1] = value;
twi_write_done = 0x00;
twi_read_done = 0x00;
twi_address_nack = 0x00;
ret_code_t result = nrf_drv_twi_tx(&m_twi, address, txBuffer, 2, 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;
}
}
void set_max30101_i2c_instance(nrf_drv_twi_t twi_instance) {
m_twi = twi_instance;
}
uint8_t init_max30101() {
uint8_t i2c_state = 0x01;
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x02, 0x40);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x03, 0x00);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x04, 0x00);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x05, 0x00);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x06, 0x00);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x08, 0b00101111);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x09, 0x07);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x0A, 0b00100111);
//RED PPG Power Setting
i2c_state = i2c_state
& i2c_write16(MAX30101_ADDRESS, 0x0C, MAX30102_RED_POWER);
//IR PPG Power Setting
i2c_state = i2c_state
& i2c_write16(MAX30101_ADDRESS, 0x0D, MAX30102_IR_POWER);
//GREEN PPG Power Setting
i2c_state = i2c_state
& i2c_write16(MAX30101_ADDRESS, 0x0E, MAX30102_GREEN_POWER);
//GREEN PPG Power Setting
i2c_state = i2c_state
& i2c_write16(MAX30101_ADDRESS, 0x0F, MAX30102_GREEN_POWER);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x10, 0x7F);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x11, 0x21);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x12, 0x03);
i2c_state = i2c_state & i2c_write16(MAX30101_ADDRESS, 0x09, 0x83);
for (uint8_t i = 0; i < 2; i++) {
wait_100_ms();
}
return i2c_state;
}
uint8_t set_max30101_normal_mode() {
uint8_t i2c_state = i2c_write16(MAX30101_ADDRESS, 0x09, 0x07);
return i2c_state;
}
uint8_t set_max30101_sleep_mode() {
uint8_t i2c_state = i2c_write16(MAX30101_ADDRESS, 0x09, 0x83);
return i2c_state;
}
uint8_t get_max30101_ir_red_green(uint32_t *ir, uint32_t *red, uint32_t *green) {
uint8_t i2c_state = 0x00;
uint8_t read_buffer[9] = { 0x00 };
i2c_state = i2c_write8(MAX30101_ADDRESS, 0x07);
i2c_state = i2c_state & i2c_read_buffer(MAX30101_ADDRESS, read_buffer, 9);
uint32_t value = (read_buffer[0] << 16);
value += (read_buffer[1] << 8);
value += read_buffer[2];
value = value & 0x03FFFF;
*red = value;
value = (read_buffer[3] << 16);
value += (read_buffer[4] << 8);
value += read_buffer[5];
value = value & 0x03FFFF;
*ir = value;
value = (read_buffer[6] << 16);
value += (read_buffer[7] << 8);
value += read_buffer[8];
value = value & 0x03FFFF;
*green = value;
return i2c_state;
}