MCU-PLUS-SDK-AM273X: am273evm

Hello DM,

I ran the setup and was able to see dummy data sent over SPI to PC. I modified the mibspi_loopback_am273x-evm_r5fss0-0_freertos_ti-arm-clang example you used, mainly the mibspi_loopback.c file code. Below is the modified code, you can copy and replace with it the code in your mibspi_loopback.c file:

#include <kernel/dpl/DebugP.h>
#include <kernel/dpl/SemaphoreP.h>
#include <kernel/dpl/HwiP.h>
#include <kernel/dpl/ClockP.h>
#include <drivers/mibspi.h>
#include "ti_drivers_config.h"
#include "ti_drivers_open_close.h"
#include "ti_board_open_close.h"

/* Block size used for the test*/
#define APP_MIBSPI_MSGSIZE 128

uint8_t gMibspiTxBuffer[APP_MIBSPI_MSGSIZE];
uint8_t gMibspiRxBuffer[APP_MIBSPI_MSGSIZE];

void mibspi_loopback_main(void *args)
{
int32_t status = SystemP_SUCCESS;
uint32_t i;
int32_t transferOK;
MIBSPI_Transaction spiTransaction;
MIBSPI_LoopBackType loopback;

Drivers_open();
Board_driversOpen();

DebugP_log("[MIBSPI] Digital Loopback example started ...\r\n");

/* Enable digital loopback */
loopback = MIBSPI_LOOPBK_DIGITAL;

/* Memfill buffers */
for(i = 0U; i < APP_MIBSPI_MSGSIZE; i++)
{
gMibspiTxBuffer[i] = i;
gMibspiRxBuffer[i] = 0U;
}

/* Initiate transfer */
spiTransaction.count = APP_MIBSPI_MSGSIZE;
spiTransaction.txBuf = (void *)gMibspiTxBuffer;
spiTransaction.rxBuf = (void *)gMibspiRxBuffer;
spiTransaction.peripheralIndex = 0U;
spiTransaction.arg = NULL;

//status = MIBSPI_enableLoopback(gMibspiHandle[CONFIG_MIBSPI0],loopback);
if(SystemP_SUCCESS != status)
{
DebugP_log("Check SPI instance mode of operation and loopback type\r\n");
}

if(SystemP_SUCCESS == status)
{
while(1)
{
transferOK = MIBSPI_transfer(gMibspiHandle[CONFIG_MIBSPI0], &spiTransaction);
// if((SystemP_SUCCESS != transferOK) ||
// (MIBSPI_TRANSFER_COMPLETED != spiTransaction.status))
// {
// DebugP_assert(FALSE); /* MIBSPI transfer failed!! */
// }
// else
// {
// /* Compare data */
// for(i = 0U; i < APP_MIBSPI_MSGSIZE; i++)
// {
// if(gMibspiTxBuffer[i] != gMibspiRxBuffer[i])
// {
// status = SystemP_FAILURE; /* Data mismatch */
// DebugP_log("Data Mismatch at offset %d\r\n", i);
// break;
// }
// }
// }
}
}

if(SystemP_SUCCESS == status)
{
DebugP_log("All tests have passed!!\r\n");
}
else
{
DebugP_log("Some tests have failed!!\r\n");
}

Board_driversClose();
Drivers_close();

return;
}

As you can see, I commented out the lines that enables it as a loopback, and the lines that compare the data (Because we don't need it for this purpose since we are only trying to send data out). The while loop was added just for better observability of the dummy data in the Serial COM terminal.

I didn't have to modify SysConfig as the example was already set to the correct Pin Pads by default in Sysconfig. 

With this modified code, you should be able to see the dummy data on any serial console/terminal of your choice (Tera Term, putty etc) on your PC

Please let me know if you encounter any issues with this and I'll be happy to help.

Best regards,

Fabrice.