hello there i am trying to interface adxl345 with nrf51822. my code is like
#define ADXL345_ADDR 0x53U
#define ADXL345_ADDR_WR 0xA6U
#define ADXL345_ADDR_RD 0xA7U
#define ADXL345_REG_MODE 0x2DU
/* Mode for MMA7660. */
#define ACTIVE_MODE 8u
void ADXL345_set_mode(void
)
{ret_code_t err_code;
uint8_t reg[2] = {ADXL345_REG_MODE, ACTIVE_MODE};
err_code = nrf_drv_twi_tx(&m_twi_adxl_345,ADXL345_ADDR_WR , reg, sizeof(reg), false);
while(m_set_mode_done == false);
}
uint8_t read_data()
{ ret_code_t err_code;
uint8_t rx_data[6];
while(1)
{
err_code = nrf_drv_twi_rx(&m_twi_adxl_345,ADXL345_ADDR_RD, rx_data, sizeof(rx_data), false);
APP_ERROR_CHECK(err_code);
}
return rx_data[6];
}
void write_data()
{
ret_code_t err_code;
uint8_t tx_data[1] = {0x32};
err_code = nrf_drv_twi_tx(&m_twi_adxl_345,ADXL345_ADDR_WR, tx_data, sizeof(tx_data), false);
}
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
ret_code_t err_code;
static sample_t m_sample;
switch(p_event->type)
{
case NRF_DRV_TWI_RX_DONE:
// read_data(&m_sample);
read_data();
m_xfer_done = true;
break;
case NRF_DRV_TWI_TX_DONE:
if(m_set_mode_done != true)
{
m_set_mode_done = true;
return;
}
m_xfer_done = false;
/* Read 4 bytes from the specified address. */
// err_code = nrf_drv_twi_rx(&m_twi_mma_7660, MMA7660_ADDR, (uint8_t*)&m_sample, sizeof(m_sample), false);
err_code = nrf_drv_twi_rx(&m_twi_adxl_345,ADXL345_ADDR_RD,(uint8_t*)&m_sample, sizeof(m_sample), false);
APP_ERROR_CHECK(err_code);
break;
default:
const nrf_drv_twi_config_t twi_adxl_345_config = {
.scl = ARDUINO_SCL_PIN,
.sda = ARDUINO_SDA_PIN,
.frequency = NRF_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH // interrupt priority
};
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_adxl_345_config = {
.scl = ARDUINO_SCL_PIN,
.sda = ARDUINO_SDA_PIN,
.frequency = NRF_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH // interrupt priority
};
err_code = nrf_drv_twi_init(&m_twi_adxl_345, &twi_adxl_345_config, twi_handler, NULL);
APP_ERROR_CHECK(err_code);
// nrf_drv_twi_enable(&m_twi_mma_7660);
nrf_drv_twi_enable(&m_twi_adxl_345);
}
int main(void)
{
uart_config();
uint8_t rx_data[6];
int x,y,z;
// int a = __GNUC__, c = __GNUC_PATCHLEVEL__;
printf("\n\rTWI sensor example\r\n");
twi_init();
ADXL345_set_mode();
uint8_t reg = {0x32};
ret_code_t err_code;
write_data();
while(true)
{
nrf_delay_ms(100);
err_code = nrf_drv_twi_tx(&m_twi_adxl_345, ADXL345_ADDR_WR, ®, sizeof(reg), true);
APP_ERROR_CHECK(err_code);
//m_xfer_done = false;
write_data();
rx_data[6]= read_data()
x = (((int)rx_data[1]) << 8) | rx_data[0];
y = (((int)rx_data[3])<< 8) | rx_data[2];
z = (((int)rx_data[5]) << 8) | rx_data[4];
printf("\n\rTWI sensor example\r\n");
printf("\n\r x is %d y is %d z is %d\r\n",x,y,z);
}
}
can you tell me what is wrong with it? i am not getting data
