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vcnl4040.c
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#include "vcnl4040.h"
#include "string.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#define VCNL4040_ADDRESS 0x60
#define ALS_CONF 0x00
#define PS_CONF1_2 0x03
#define PS_CONF3_PS_MS 0x04
#define PS_Data 0x08
#define ALS_Data 0x09
#define White_Data 0x0A
#define ID 0x0C
typedef union {
struct {
uint16_t ALS_SD :1;
uint16_t ALS_INT_EN :1;
uint16_t ALS_PERS :2;
uint16_t Reserved0 :2;
uint16_t ALS_IT :2;
uint16_t Reserved1 :8;
} bits;
uint16_t value;
} als_conf_t;
typedef union {
struct {
uint16_t PS_SD :1;
uint16_t PS_IT :3;
uint16_t PS_PERS :2;
uint16_t PS_Duty :2;
uint16_t PS_INT :2;
uint16_t Reserved0 :1;
uint16_t PS_HD :1;
uint16_t Reserved1 :4;
} bits;
uint16_t value;
} ps_conf1_2;
typedef union {
struct {
uint16_t PS_SC_EN :1;
uint16_t Reserved0 :1;
uint16_t PS_TRIG :1;
uint16_t PS_AF :1;
uint16_t PS_SMART_PERS :1;
uint16_t PS_MPS :2;
uint16_t Reserved1 :1;
uint16_t LED_I :3;
uint16_t Reserved2 :3;
uint16_t PS_MS :1;
uint16_t White_EN :1;
} bits;
uint16_t value;
} ps_conf3_ps_ms;
static nrf_drv_twi_t m_twi;
static void wait_100_ms() {
vcnl4040_100ms_timer = 0x00;
while (!vcnl4040_100ms_timer) {
if (NRF_LOG_PROCESS() == false) {
nrf_pwr_mgmt_run();
}
}
}
void set_vcnl4040_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, 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_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_read_done && --timeout) {
}
memcpy(read_value, rxBuffer, buffer_size);
if (!timeout || twi_address_nack) {
return 0x00;
} else {
return 0x01;
}
} else {
return 0x00;
}
}
uint8_t init_vcnl4040() {
uint8_t i2c_state = 0x00;
uint8_t init_value[2] = { 0x00 };
als_conf_t als_conf;
als_conf.value = 0x00;
init_value[0] = (als_conf.value & 0xFF);
init_value[1] = (als_conf.value >> 8);
for (uint8_t i = 0; i < 2; i++) {
wait_100_ms();
}
i2c_state = i2c_write_buffer(VCNL4040_ADDRESS, ALS_CONF, init_value, 2);
return i2c_state;
}
uint8_t get_vcnl4040_ambient_light(uint16_t *ambient_light) {
uint8_t i2c_state = 0x00;
uint8_t read_value[2] = { 0x00 };
i2c_state = i2c_write8(VCNL4040_ADDRESS, ALS_Data);
i2c_state = i2c_state & i2c_read_buffer(VCNL4040_ADDRESS, read_value, 2);
uint16_t value = ((uint16_t) read_value[1] << 8 | read_value[0]);
*ambient_light = value * 0.1;
return i2c_state;
}