AM4379: eCAP init issue

Hi I Tried to do the same thing with the CSL instead of dal  now it doesent Crash but i dont have PWM Signal on Pinj24

void APWM_Init(void)
{

    int32_t status = S_PASS;
    uint32_t baseAddr = 0;

    if (TRUE == CHIPDBIsResourcePresent(CHIPDB_MOD_ID_PWMSS, 1U))
    {
        baseAddr = CHIPDBBaseAddress(CHIPDB_MOD_ID_PWMSS, 1U);
    }
    else
    {
        status = E_FAIL;
    }


    /* ECAP Module Enable  */
    status = PRCMModuleEnable(CHIPDB_MOD_ID_PWMSS, 1U, 0U);

    //Pinmux eCAP1_in_PWM1_out Pin J24
    PINMUXModuleConfig(CHIPDB_MOD_ID_PWMSS, 1U, NULL);
    HW_WR_REG32(baseAddr + PIN_UART0_TXD, PIN_MODE(4));

    ECAPClockEnable(baseAddr);
 
    ECAPCaptureLoadingEnable(baseAddr);

    // Set to APWM Mode
 
    ECAPOperatingModeSelect(baseAddr, ECAP_APWM_MODE); 

    ECAPAPWMCaptureConfig(baseAddr,COMPARE_APWM,PERIOD_APWM);

    ECAPAPWMPolarityConfig(baseAddr, ECAP_APWM_ACTIVE_HIGH);

    ECAPCounterControl(baseAddr, ECAP_COUNTER_FREE_RUNNING);


}

Any Advice ?

Hi,

Browsing through AM437x PRSDK, I don't observe an example for eCAP for APWM generation. eCAP APWM mode is described in the AM437x TRM, 20.3.2.2.8 APWM Mode Operation.

Can you connect via JTAG (continuous refresh) and confirm TSCTR is counting?

What values are you using for CAP1 (period) and CAP2 (compare)? Is the compare value within the period?

Have you double checked your pinmux settings?

Regards,
Frank

Hi,

thanks for pointing me to the right direction,

i  mismatched my Baseaddresses i used the Baseadress of PWMSS1 adress instead of SOC_PWMSS1_ECAP_REG

for others this is my working code:

int32_t APWM_Init(void)
{

    int32_t status = S_PASS;

    /* PWMSS_ECAP Module & Clk Enable  */
    status = PRCMModuleEnable(CHIPDB_MOD_ID_PWMSS, 1U, 0U);

    uint32_t ctrlModBase;
    ctrlModBase = CHIPDBBaseAddress(CHIPDB_MOD_ID_CONTROL_MODULE, 0);

    //Pinmux eCAP1_in_PWM1_out Pin J24
    HW_WR_REG32(ctrlModBase + PIN_UART0_TXD, PIN_MODE(4)|PIN_PULL_UP_EN| PIN_RX_ACTIVE);

 //   ECAPClockEnable(baseAddr);

    ECAPOperatingModeSelect(SOC_PWMSS1_ECAP_REG, ECAP_APWM_MODE);

    ECAPCounterConfig(SOC_PWMSS1_ECAP_REG, 0);

    ECAPAPWMCaptureConfig(SOC_PWMSS1_ECAP_REG,COMPARE_APWM,PERIOD_APWM);

    ECAPAPWMPolarityConfig(SOC_PWMSS1_ECAP_REG, ECAP_APWM_ACTIVE_HIGH);

    ECAPSyncInOutSelect(SOC_PWMSS1_ECAP_REG, ECAP_SYNC_IN_DISABLE,ECAP_SYNC_OUT_DISABLE);

    ECAPCounterControl(SOC_PWMSS1_ECAP_REG, ECAP_COUNTER_FREE_RUNNING);

    return status;


}