Tool/software: TI-RTOS
Hi All,
I am using CC2640R2F as SPI slave mode and have some issue. There are two cases of my test, case 1 success and case 2 not. Using the same code in both cases, and provided my code as follow. Please give me some hint. If Case 2 is necessary, can I use SPI slave mode?
Code:
uint8_t tbuf[5]={0x31,0x32,0x33,0x34,0x35},rbuf[5]; // Receive and transmit buffer
// Callback function
static void transferCallback(SPI_Handle handle, SPI_Transaction *transaction)
{
// Start another transfer
SPI_transfer(handle, transaction);
}
static void SimpleBLEPeripheral_taskFxn(UArg a0, UArg a1)
{
// Initialize application
SimpleBLEPeripheral_init();
// for SPI
// Callback function
SPI_init();
// Init SPI and specify non-default parameters
SPI_Params_init(&spi_params);
spi_params.bitRate = 4000000;
spi_params.frameFormat = SPI_POL0_PHA0;
spi_params.mode = SPI_SLAVE;
spi_params.transferMode = SPI_MODE_CALLBACK;
spi_params.transferCallbackFxn = transferCallback;
// Configure the transaction
transaction.count = 5;
transaction.txBuf = tbuf;
transaction.rxBuf = rbuf;
// Open the SPI and initiate the first transfer
spi_handle = SPI_open(Board_SPI0, &spi_params);
SPI_transfer(spi_handle, &transaction);
// Wait forever
while(true);
}
case 1:
The SPI master sends 5 bytes, the chip select (CS) pin goes low, a byte is transferred and then goes high. (fig 1)
=>CC2640R2F receive 5 bytes successfully.
case 2:
SPI Master Sends 5 Bytes, Chip Select (CS) Pin holds Low during data transfer, goes High after 5-bytes transfer completes.(fig2)
=> not work, CC2640R2F only receive first byte successfully.
BR,
Jack
