Problem with SPI and ADXL345
Hi, I’m having trouble reading measurements from the ADXL345 using SPI. I’ve attached a picture from the debugger that shows a view of the variables. The SPI is configured as master full duplex, and I’ve included a screenshot showing the SPI configuration. The SCK is connected to SCL, MISO to SDO, MOSI to SDA, and CS is connected to a configured output. I’m looking for help because I can’t figure out how to solve this issue.
int main(void)
{
void adxl_init(void);
while (1)
{
adxl_read(0x32);
// x = (data_rec[1]<<8|data_rec[0]);
// y = (data_rec[3]<<8|data_rec[2]);
// z = (data_rec[5]<<8|data_rec[4]);
x = ((data_rec[1] << 8) | data_rec[0]);
y = ((data_rec[3] << 8) | data_rec[2]);
z = ((data_rec[5] << 8) | data_rec[4]);
xg = x*.0078;
yg = x*.0078;
zg = x*.0078;
}
}
void adxl_write (uint8_t address, uint8_t value)
{
uint8_t data[2];
data[0] = address|0x40; // multibyte write
data[1] = value;
HAL_GPIO_WritePin (GPIOB, GPIO_PIN_6, GPIO_PIN_RESET); // pull the cs pin low
HAL_SPI_Transmit (&hspi2, data, 2, 100); // write data to register
HAL_GPIO_WritePin (GPIOB, GPIO_PIN_6, GPIO_PIN_SET); // pull the cs pin high
}
void adxl_read (uint8_t address)
{
address |= 0x80; // read operation
address |= 0x40; // multibyte read
HAL_GPIO_WritePin (GPIOB, GPIO_PIN_6, GPIO_PIN_RESET); // pull the pin low
HAL_SPI_Transmit (&hspi2, &address, 1, 100); // send address
HAL_SPI_Receive (&hspi2, data_rec, 8, 100); // receive 6 bytes data
HAL_GPIO_WritePin (GPIOB, GPIO_PIN_6, GPIO_PIN_SET); // pull the pin high
}
void adxl_init(void)
{
adxl_write (0x31, 0x01);
adxl_write (0x2d, 0x00);
adxl_write (0x2d, 0x08);
}
void tx_com(uint8_t *tx_buffer, uint16_t len)
{
HAL_UART_Transmit(&huart2, tx_buffer, len, 1000);
}