Gets the same value every time after enabling FIFO and setting FIFO mode(LIS2DH12)
I am using the LIS2DH12 accelerometer in our product. I am trying to use FIFO.
I have set watermark level to 10 and use fifo buffer in fifo mode.
Every 1 sec I have read data from output register but every time I got same value irrespective of accelerometer is in stable or moving position.
The Configuration settings used as follows
static uint8_t x_buf [10]={0};
static uint8_t y_buf [10]={0};
static uint8_t z_buf [10]={0};
spi_write_reg(LIS2DH_CTRL_REG1, 0X2F); // ODR 10HZ AND LOW POWER MODE ENABLE
spi_write_reg(LIS2DH_CTRL_REG2, 0X00); // HIGH PASS FILTER DISABLED
spi_write_reg(LIS2DH_CTRL_REG4, 0X80); // BLOCK DATA UPDATE AND FS = ±2 g
spi_write_reg(LIS2DH_CTRL_REG5, 0x48); // FIFO ENABLE & LATCH ENABLE ON INT1
spi_write_reg(LIS2DH_FIFO_CTRL_REG, 0x4A); // FIFO MODE SELECTED AND NO OF SAMPLE - 10
spi_write_reg(LIS2DH_CTRL_REG3, 0x04); // FIFO WATERMARK INTERRUPT ENABLE 0N INT1
After 1 Sec
void fifo_read()
{
uint8_t watermark_val;
watermark_val = spi_read_reg(LIS2DH_FIFO_SRC_REG);
if( watermark_val == 0x8B)
{
for( uint8_t i = 0; i< 10; i++)
{
x_buf[i] = spi_read_reg(LIS2DH_OUT_X_H);
y_buf[i] = spi_read_reg(LIS2DH_OUT_Y_H);
z_buf[i] = spi_read_reg(LIS2DH_OUT_Z_H);
}
spi_write_reg(LIS2DH_FIFO_CTRL_REG, 0x00); // RESET FIFO
spi_write_reg(LIS2DH_FIFO_CTRL_REG, 0x4A); // FIFO MODE SELECTED AND NO OF SAMPLE - 10
}
}
Can you tell me whether the above is correct? My requirement is to store 10 samples in FIFO and read them every 1s for further processing.