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SSIConfigSetExpClk freezes in Keil but works in Eclipse.

Zach Wilcox
Prodigy 160 points

Dear TIVA Users,

I'm trying to configure the SSI0 port for using SPI as a slave.
The weird thing is,  SSIConfigSetExpClk hangs when executed. 

Another weird thing is this only occurs when using Keil.  The code works properly in Eclipse using the gcc-arm cross compilier

The link below had a similar problem which was resolved by changing SysCtlClockSet to SysCtlClockFreqSet.

https://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/313814

I'm using the TM4C1294XL board.

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_memmap.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/ssi.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"

void
InitConsole(void)
{
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
    GPIOPinConfigure(GPIO_PA0_U0RX);
    GPIOPinConfigure(GPIO_PA1_U0TX);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

    UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);

    GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
    UARTStdioConfig(0, 115200, 16000000);
}
void SystemInit(){}
int
main(void)
{
    //SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
    //               SYSCTL_XTAL_16MHZ);
    SysCtlClockFreqSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ, 10000000);


    InitConsole();
    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    GPIOPinConfigure(GPIO_PA2_SSI0CLK);
    GPIOPinConfigure(GPIO_PA3_SSI0FSS);
    GPIOPinConfigure(GPIO_PA4_SSI0XDAT0);
    GPIOPinConfigure(GPIO_PA5_SSI0XDAT1);

    GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 |
                   GPIO_PIN_2);

    UARTprintf("test 1\n");
    volatile uint32_t test = SysCtlClockGet();
    SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0,
            SSI_MODE_SLAVE, 1000000, 8);
   

    UARTprintf("test 2\n");                  //never gets here
    SSIEnable(SSI0_BASE);
   

    uint32_t temp = 0;
    while(SSIDataGetNonBlocking(SSI0_BASE, &temp))
    {
    }
    while(1)
    {

        SSIDataGet(SSI0_BASE, &temp);

        temp &= 0x00FF;


        switch(temp)
        {
            case 'M':
                SSIDataPut(SSI0_BASE, 'S');
                break;
            case 'A':
                SSIDataPut(SSI0_BASE, 'L');
                break;
            case 'S':
                SSIDataPut(SSI0_BASE, 'A');
                break;
            case 'T':
                SSIDataPut(SSI0_BASE, 'V');
                break;
            case 'R':
                SSIDataPut(SSI0_BASE, 'E');
                break;
        }

    }
}