TMS320C5517: Why does my timer seem to not exist?

Hi,

I've notified the sw team. Please state which SDK are you using or is this a bare metal code?

Best Regards,
Yordan

I don't know from which SDK the register.h file comes from, it could potentially be several years old. However, I don't mind adding those lines of code myself, but I'm more concerned about my code not working properly.

user4463194,

We currently support the C55x CSL which can be found here http://software-dl.ti.com/dsps/dsps_public_sw/dsps_swops_houston/C55X/latest/index_FDS.html hence the reason for asking which SW package you are using.

Taking a look at the CSL timer driver, there are definitions for Timer0

/********************************************************************* 
* Timer Registers (0x1800 - 0x1896)
**********************************************************************/
#define IOPORT_REG_TIMER0_CONTROL            (IOPORT_REGISTER(0x1810))
#define IOPORT_REG_TIMER0_PERIOD_0           (IOPORT_REGISTER(0x1812))
#define IOPORT_REG_TIMER0_PERIOD_1           (IOPORT_REGISTER(0x1813))
#define IOPORT_REG_TIMER0_COUNTER_0          (IOPORT_REGISTER(0x1814))
#define IOPORT_REG_TIMER0_COUNTER_1          (IOPORT_REGISTER(0x1815))

Are you in a position to try these examples to see if it works for you?

C:\ti\c55_lp\c55_csl_3.08\ccs_v6.x_examples\rtc

Lali

If I include those 5 lines of #defines then I get the following build error:

error #138: expression must be a modifiable lvalue

I have modified my code a bit, but it still doesn't work (I get no timer interrupt) and the register values don't change in the Register view in the debug window. When I break execution and look at the register values I see the following:

TIMER0

   TCR           0x0000

   TIMPRD1 0xFFFF

   TIMPRD2 0x0000

   TIMCNT1 0xFFFF

   TIMCNT2 0x0000

   TINSF       0xFFFF

I can't change the values either in the debugger Register view, it's like those registers are read only .

#define SYSTEM_CLK_FREQ_Hz   ((uint32_t)196000000)

#define T0CR            *(ioport volatile uint16_t *)0x1810
#define TIM0PRD1        *(ioport volatile uint16_t *)0x1812
#define TIM0PRD2        *(ioport volatile uint16_t *)0x1813
#define TIM0CNT1        *(ioport volatile uint16_t *)0x1814
#define TIM0CNT2        *(ioport volatile uint16_t *)0x1815
#define TISR            *(ioport volatile uint16_t *)0x1C3E

uint16_t configAndRestartTimer(uint16_t delayMs, uint16_t timerIntCallbackPtr) {
    PCGCR1 &= ~(0x0400);
    T0CR = 0x8000;                                     // Enable timer
    uint32_t timerFreq = SYSTEM_CLK_FREQ_Hz / 8192;
    uint32_t numNeededTimerTicks = timerFreq/(1000 * ((uint32_t)delayMs));
    TIM0PRD2 = (uint16_t)(numNeededTimerTicks >> 16);  // Set period of timer
    TIM0PRD1 = (uint16_t)(numNeededTimerTicks >> 0);   // Set period of timer
    TIM0CNT2 = 0;                                      // Reset the count value
    TIM0CNT1 = 0;                                      // Reset the count value
    IER0 |= 0x0010;

    T0CR = (((uint16_t) 1)     << 15) |                // Enable timer
           (((uint16_t) 0xC)   << 2)  |                // 8192 as prescalar. This will give a timer freq of 196 MHz / 8192 = 23.926 kHz (timer period: 41.8 microseconds)
           (((uint16_t) 0)     << 1)  |                // Auto-reload is disabled
           (((uint16_t) 1)     << 0);                  // Start the counter
}

interrupt void timerIsr(void) {
    UART_SW_Tx_ONLY_transmitNullTermString("\r\ntimerIsr");
}

user4463194,

Unsure why you are seeing that error.

Just so that we are on the same page, could you please try to run the GPT example that's in the CSL I referenced above?

Its located at C:\ti\c55_lp\c55_csl_3.08\ccs_v6.x_examples\gpt\CSL_GPTExample

This uses timer0 as highlighted in the code. Want to know if thie example works on your setup.

Lali