Posted on September 12, 2014 at 04:32I have a STM32F2xx connected to FTDI UM232H using SPI communication, STM will configured as Slave and FTDI as Master, I will be using NVID
I have configured my SPI as below:
- 2 line duplex
- 1 Mhz clock
- MSB
- 8bit
- Phase = Low
- Polarity = Positive
- Hardware: 4 lines connection, CS, SCLK, MOSI, MISO
I have no problem sending data from STM to FTDI, I could read the data correctly.
But, the problem starts when I start to send data from FTDI to STM32, I could not read the data properly, I always get 0x00 when I called SPI_I2S_ReceiveData(SPI2);
I could see the signal from FTDI is correctly generated and I could get the interupt in my STM, but I cant get the data, always 0...
and when I configured the SPI as SPI_Direction_1Line_Rx, now I am getting 0xFF instead of 0...
Any idea what is wrong???
My SPI configuration:
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
