TMS320F28379D: driverlib: Transmit-only SCI

Hi Torsten,

The LAUNCHXL-F28379D (Launchpad for the TMS320F28379D) has an out of box demo located in the directory below that will sample one of the ADC channels and output the results to a display in a serial terminal via UART/SCI. This might be a good example project to reference. You can modify the example to transmit what you want instead of the ADC sample readings.

C:\ti\c2000\C2000Ware_version\device_support\f2837xd\examples\cpu1\launchxl_f28379d

Let me know if this helps or if you have any questions.

Best Regards,

Marlyn

Hi Torsten,

I updated the code for the sci_ex2_loopback_interrupts.c example to implement a transmit-only UART (driverlib version).

//
// Included Files
//
#include "driverlib.h"
#include "device.h"

//
// Globals
//

//
// Send data for SCI-A
//
uint16_t sDataA[2];
//
// Function Prototypes
//
__interrupt void sciaTXFIFOISR(void);
void initSCIAFIFO(void);

//
// Main
//
void main(void)
{
    uint16_t i;

    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Setup GPIO by disabling pin locks and enabling pullups
    //
    Device_initGPIO();

    //
    // Configuration for the SCI Tx pin.
    //
    GPIO_setMasterCore(DEVICE_GPIO_PIN_SCITXDA, GPIO_CORE_CPU1);
    GPIO_setPinConfig(DEVICE_GPIO_CFG_SCITXDA);
    GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCITXDA, GPIO_DIR_MODE_OUT);
    GPIO_setPadConfig(DEVICE_GPIO_PIN_SCITXDA, GPIO_PIN_TYPE_STD);
    GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCITXDA, GPIO_QUAL_ASYNC);

    //
    // Initialize PIE and clear PIE registers. Disables CPU interrupts.
    //
    Interrupt_initModule();

    //
    // Initialize the PIE vector table with pointers to the shell Interrupt
    // Service Routines (ISR).
    //
    Interrupt_initVectorTable();

    //
    // Interrupts that are used in this example are re-mapped to
    // ISR functions found within this file.
    //
    Interrupt_register(INT_SCIA_TX, sciaTXFIFOISR);

    //
    // Initialize the Device Peripherals:
    //
    initSCIAFIFO();

    //
    // Init the send data.  After each transmission this data
    // will be updated for the next transmission
    //
    for(i = 0; i < 2; i++)
    {
        sDataA[i] = i;
    }

    Interrupt_enable(INT_SCIA_TX);

    Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);

    //
    // Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
    //
    EINT;
    ERTM;

    //
    // IDLE loop. Just sit and loop forever (optional):
    //
    for(;;);
}


//
// sciaTXFIFOISR - SCIA Transmit FIFO ISR
//
__interrupt void sciaTXFIFOISR(void)
{
    uint16_t i;

    SCI_writeCharArray(SCIA_BASE, sDataA, 2);

    //
    // Increment send data for next cycle
    //
    for(i = 0; i < 2; i++)
    {
        sDataA[i] = (sDataA[i] + 1) & 0x00FF;
    }

    SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_TXFF);

    //
    // Issue PIE ACK
    //
    Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);
}

//
// initSCIAFIFO - Configure SCIA FIFO
//
void initSCIAFIFO()
{
    //
    // Initialize SCIA and its FIFO.
    //
    SCI_performSoftwareReset(SCIA_BASE);

    //
    // 8 char bits, 1 stop bit, no parity. Baud rate is 9600.
    //
    SCI_setConfig(SCIA_BASE, DEVICE_LSPCLK_FREQ, 9600, (SCI_CONFIG_WLEN_8 |
                                                        SCI_CONFIG_STOP_ONE |
                                                        SCI_CONFIG_PAR_NONE));
    SCI_resetChannels(SCIA_BASE);
    SCI_resetTxFIFO(SCIA_BASE);
    SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_TXFF);
    SCI_enableFIFO(SCIA_BASE);

    //
    // TX FIFO Interrupts Enabled
    //
    SCI_enableInterrupt(SCIA_BASE, SCI_INT_TXFF);

    SCI_enableModule(SCIA_BASE);
    SCI_performSoftwareReset(SCIA_BASE);
    SCI_resetTxFIFO(SCIA_BASE);

#ifdef AUTOBAUD
    //
    // Perform an autobaud lock.
    // SCI expects an 'a' or 'A' to lock the baud rate.
    //
    SCI_lockAutobaud(SCIA_BASE);
#endif
}

//
// End of file
//

I changed the SCI_enableModule() function in the sci.h file to be:

static inline void
SCI_enableModule(uint32_t base)
{
    //
    // Check the arguments.
    //
    ASSERT(SCI_isBaseValid(base));

    //
    // Enable TX, and the SCI.
    //
    HWREGH(base + SCI_O_CTL1) |= (SCI_CTL1_TXENA | SCI_CTL1_SWRESET);
    
    //
    // Enable RX, TX, and the SCI.
    //
    //HWREGH(base + SCI_O_CTL1) |= (SCI_CTL1_TXENA | SCI_CTL1_RXENA |
                                  //SCI_CTL1_SWRESET);
}

Hopefully it helps and is what you are looking for.

Best Regards,

Marlyn