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LM4F120H5QR code stops at GPIOPinConfigure(GPIO_PCTL_PD2_SSI1RX);

Raphael Lehmann
Prodigy 20 points
Other Parts Discussed in Thread: ADS1271

Hi,

I've a problem with SSI and stellarisware on the TI Stellaris Launchpad.

While the configuration of the SSI1 peripherial (same way as in stellarisware example), the programm seems to stop at "GPIOPinConfigure(GPIO_PCTL_PD2_SSI1RX);".
I don't know why and any other things are working well...

Code: 

void SerialInit(unsigned int baud) {
	SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
	GPIOPinConfigure(GPIO_PA0_U0RX);
	GPIOPinConfigure(GPIO_PA1_U0TX);
	GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
	UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), baud,
			(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));
}

void SerialSyncPrintChar(char c) {
    UARTCharPut(UART0_BASE, c);
}

void SerialSyncPrintE(char* msg) {
	unsigned int cCount = strlen(msg);
	int i = 0;
	for (i = 0; i < cCount; i++) {
		SerialSyncPrintChar(msg[i]);
	}
}

void init_SpiADC() {
	SerialSyncPrintE("SSI1");

	SerialSyncPrintE("i0");
	SysCtlDelay(2666666);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI1);

	SerialSyncPrintE("i1");
	SysCtlDelay(2666666);

	GPIOPinConfigure(GPIO_PCTL_PD0_SSI1CLK);
	GPIOPinConfigure(GPIO_PCTL_PD1_SSI1FSS);
	SerialSyncPrintE("i2");
	SysCtlDelay(2666666);
	GPIOPinConfigure(GPIO_PCTL_PD2_SSI1RX);
	SerialSyncPrintE("i3");
	SysCtlDelay(2666666);
	GPIOPinConfigure(GPIO_PCTL_PD3_SSI1TX);	

	SerialSyncPrintE("i4");
	SysCtlDelay(2666666);
	GPIOPinTypeSSI(GPIO_PORTD_BASE, (GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3));

	SerialSyncPrintE("i5");
	SysCtlDelay(2666666);

	SSIConfigSetExpClk(SSI1_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0,
	SSI_MODE_MASTER, SysCtlClockGet() / 64, 8);
	// -> 80Mhz/64 -> 0.625Mhz SPI Clock

	SerialSyncPrintE("i6");
	SysCtlDelay(2666666);

	// Enable the SSI0 module.
	SSIEnable(SSI1_BASE);

        // ...
}

int main(void) {
    SysCtlClockSet(
    SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

    SysCtlPeripheralEnable(
            SYSCTL_PERIPH_GPIOA | SYSCTL_PERIPH_GPIOB | SYSCTL_PERIPH_GPIOD
                    | SYSCTL_PERIPH_GPIOE | SYSCTL_PERIPH_GPIOF);

    SerialInit(115200); // 115200 Baud


    SysCtlDelay(2666666);

    // ADC over SPI:
    init_SpiADC();

    // ...
}

I see receive "i2", but never "i3" :(

If anyone could provide any information on this I'd be very greatful!

regards

Raphael.

  • 0
    TI__Guru**** 244400 points

    Hello Raphael

    The GPIOPinConfigure function call expects the parameters from the pin_map.h. The above code should be 

    	GPIOPinConfigure(GPIO_PD0_SSI1CLK);
	GPIOPinConfigure(GPIO_PD1_SSI1FSS);
	SerialSyncPrintE("i2");
	SysCtlDelay(2666666);
	GPIOPinConfigure(GPIO_PD2_SSI1RX);
	SerialSyncPrintE("i3");
	SysCtlDelay(2666666);
	GPIOPinConfigure(GPIO_PD3_SSI1TX);

    Regards

    Amit

  • 0 in reply to Amit Ashara
    Prodigy 20 points

    Hello,

    your solution works, thank your very much.

    Now i have an other Problem:

    the following code should return the value of the ADC ADS1271 (http://www.ti.com/lit/ds/symlink/ads1271.pdf), but i always get 0 (from spi_data and ret).

    The ADS1271 is running in High Speed Mode and Format ist set to SPI (both FORMAT and MODE pins direct connected to ground; the DIN pin ist also connected to ground; PWDN pin is switches by teh Stellaris MCU to 0 and the clock input (CLK) is direct connected to an XO22 27MHz oscillator).

    long readSpiADC2() {
	unsigned long spi_data = 0L;
	unsigned long ret = 0L;
	char byten[3];
	unsigned long dummy_data = 0xFFFFFFFF;

	// wait until DRDY (connected to PD_7) gets low
	while (adcDRDY()) {
		serialTrick();
	}
	SysCtlDelay(100);
	// Receive 3 bytes of data.
	for (int h = 0; h <= 2; h++) {
		SSIDataPutNonBlocking(SSI1_BASE, dummy_data);
	}
	for (int i = 0; i <= 2; i++) {
		SSIDataGet(SSI1_BASE, &spi_data);
		byten[i] = spi_data;
		spi_data = 0L;
		SerialSyncPrintE("#i spi_data: ");
		SerialSyncPrintI(spi_data);
		SerialSyncPrintE("\r\n");
	}
	// Not necessary:
	while (SSIBusy(SSI1_BASE)) {
	}
	ret = ((byten[0] << 16) | (byten[1] << 8) | (byten[2]));
	SerialSyncPrintE("#i ret: ");
	SerialSyncPrintI(ret);
	SerialSyncPrintE("\r\n");
	return ret;
}

int adcDRDY() {
	if (GPIOPinRead(GPIO_PORTD_BASE, GPIO_PIN_7) == GPIO_PIN_7)
		return 1;
	else
		return 0;
}


    I do not have an logic analyser or an oscilloscope, so i can not see whether the adc sends out something over spi.

    Is the code correct and the ADS1271 defect?

    Thanks.

  • 0 in reply to Raphael Lehmann
    TI__Guru**** 244400 points

    Hello Raphael,

    First of all, can you hare the configuration code for SSI on the Tiva device side. We need to make sure that it is correct. Also I do not understand what the function serialTick() is protoyped as.

    Lastly, connecting a scope/LA would be better than debugging the code since we need to make sure the CS and CLK pulses are going as expected to the external device.

    Regards

    Amit