Posted on December 28, 2015 at 06:58MCU: STM32F429NHi. I know from datasheet that spi should be configured as mode3 (CPOL=1, CPHA=1), but its working only with mode 1 (CPOL=0, CPHA=1)
In mode 3 - x-axis is stuck with value: -32624.
Someone know the problem?
spi config:
Accl_SpiHandle.Instance = SPI4;
Accl_SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16; //2.8Mhz (MAX from datasheet is 10MHz)
Accl_SpiHandle.Init.Direction = SPI_DIRECTION_2LINES; // Need bidirectional here for read and write.
Accl_SpiHandle.Init.Mode = SPI_MODE_MASTER; // Stm32f4 should be the master
Accl_SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT; // we send 8 Bits
Accl_SpiHandle.Init.NSS = SPI_NSS_SOFT; // Chip select hardware/software - set this to software.
Accl_SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB; // Starting with MSB - (Datatsheet p.22 - Read and write protocol)
Accl_SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW; // Clock polarity- the base value of the clock is one (Datatsheet p.22 - Read and write protocol)
Accl_SpiHandle.Init.CLKPhase = SPI_PHASE_2EDGE; // Data should be captured at the rising edge of SPC and data is output on a falling edge.
HAL_SPI_Init(&Accl_SpiHandle);
}
MEMS config:
int memsSensor_Initialize(void) {
//set Output data rate in normal mode
if (!LIS3DH_SetODR(LIS3DH_ODR_50Hz))
return eERROR;
//set Power Mode as normal(turn ON device) (not power save)
if (!LIS3DH_SetMode(LIS3DH_NORMAL))
return eERROR;
//set axis Enable
if (!LIS3DH_SetAxis(LIS3DH_X_ENABLE | LIS3DH_Y_ENABLE | LIS3DH_Z_ENABLE))
return eERROR;
//set Fullscale measurement range of ±2g.
if (!LIS3DH_SetFullScale(LIS3DH_FULLSCALE_2))
return eERROR;
}
