CCS/TMS570LS0232: some questions about the spi commuication with a sample chip

Hello,

LS0232 is the SPI master in your configuration. The LS0232 SPI provides the serial clock to the sample chip. Data written to the shift register initiates data transmission on the SIMO pin, MSB first. Simultaneously, received data is shifted through the SPISOMI pin into the LSB of the SPIDAT0 register. Both transmit and receive use the same clock.

1. you can use either SPI2 or SPI3 to tx and rx data to/from the sample chip, but you can not use SPI2 to TX and SPI3 to read.

2. CHARLEN[4:0] specifies the number of bits (2 to 16) in the data word. The CHARLEN[4:0] value directs the state control logic to count the number of bits received or transmitted to determine when a complete word is transferred. When you call the spiTransmitData()/spiGetData() or spiTransmitAndReceiveData(), you need to define the dataconfig_t first:

 spiDAT1_t dataconfig1_t;

 dataconfig1_t.CS_HOLD = FALSE;
 dataconfig1_t.WDEL    = TRUE;
 dataconfig1_t.DFSEL   = SPI_FMT_0;  //select 8 bit in HALCoGen
 dataconfig1_t.CSNR    = 0xFE;             //use CS0