Other Parts Discussed in Thread: SYSBIOS
Tool/software: Code Composer Studio
PWM interrupt with DSP is not associated with interrupt service routine, so ISR routine is no executed.
The codes as here
Ether in DSP statics or in C file dynamics to create epwmISR :
In configure file:
var Hwi = xdc.useModule('ti.sysbios.hal.Hwi');
/* initialize hwiParams to default values */
var hwiParams = new Hwi.Params;
hwiParams.arg = 10; /* Set myIsr5 argument to 10 */
hwiParams.enableInt = false; /* override default setting */
hwiParams.eventId = 75;
/* Create a Hwi object for interrupt number 5
* that invokes myIsr5() with argument 10 */
Hwi.create(5, '&epwmISR', hwiParams);
Or in C file:
Hwi_Params hwiParams;
Hwi_Handle myHwi;
Error_Block eb;
/* initialize error block and hwiParams to default values */
Error_init(&eb);
Hwi_Params_init(&hwiParams);
hwiParams.arg = 10;
hwiParams.enableInt = FALSE;
myHwi = Hwi_create(5, epwmISR, &hwiParams, &eb);
if (myHwi == NULL) {
System_abort("Hwi create failed");
}
And:
In C file:
void PWM_InterruptConfig(void)
{
/*
* AM57x DSP does not have a default Xbar connection for PWM
* interrupts, need to use a reserved IRQ Xbar instance for Xbar
* interrupt configuration
*/
/* Use reserved XBAR_INST_DSP1_IRQ_75 */
CSL_xbarIrqConfigure(CSL_XBAR_IRQ_CPU_ID_DSP1, CSL_XBAR_INST_DSP1_IRQ_75, CSL_XBAR_PWMSS2_IRQ_ePWM1INT);
// disables the ePWM Event interrupt.
CSL_epwmEtIntrDisable(PWM_BASE_ADDRESS);
// Configures the interrupt source and interrupt period.
// Enable event time-base counter equal to zero.
// Generate an interrupt on the first event
CSL_epwmEtIntrCfg(PWM_BASE_ADDRESS, PWMSS_EPWM_ETSEL_INTSEL_CTR_0, PWMSS_EPWM_ETPS_INTPRD_GEN_FIRST_EVT);
// Enables the ePWM Event interrupt.
CSL_epwmEtIntrEnable(PWM_BASE_ADDRESS);
}
void epwmISR(void)
{
// disables the ePWM Event interrupt.
CSL_epwmEtIntrDisable(PWM_BASE_ADDRESS);
isr_count++;
GPIO_write(GPIO_PIN_TP48, GPIO_PIN_VAL_HIGH); //For test purpose in Oscillate Scope
// printf("* PWM ISR *\n");
// Enables the ePWM Event interrupt.
CSL_epwmEtIntrEnable(PWM_BASE_ADDRESS);
}
PWM_run()
{
PWM_pwmInit();
PWM_InterruptConfig();
PWM_pwmConfig(freq, amp);
GPIO_init();
GPIO_crossbarInit();
GPIO_write(GPIO_PIN_TP48, GPIO_PIN_VAL_LOW);
delay(3);
PWM_InterruptConfig();
Hwi_Params hwiParams;
Hwi_Handle myHwi;
Error_Block eb;
/* initialize error block and hwiParams to default values */
Error_init(&eb);
Hwi_Params_init(&hwiParams);
hwiParams.arg = 10;
hwiParams.enableInt = FALSE;
myHwi = Hwi_create(5, (ti_sysbios_hal_Hwi_FuncPtr)epwmISR, &hwiParams, &eb);
if (myHwi == NULL) {
printf("Hwi create failed\n");
System_abort("Hwi create failed");
}
else
{
Hwi_enableInterrupt(5);
//wiParams.enableInt = TRUE;
}
PWM_SonicsOn();
Task_sleep(1);
PWM_SonicsOff();
Task_sleep(1);
PWM_SonicsOn();
Task_sleep(1);
GPIO_delay(3);
if(isr_count)
{
isr_count = 0;
printf("\nISR Count %d\n", isr_count);
}
/* Start BIOS */
BIOS_start();
return (0);
}
Disassembly Vector Table:
ti_sysbios_family_c64p_Hwi_int5():
8409aca0: 003C54F6 STW.D2T2 B0,*B15--[2]
8409aca4: 0014A35A MVK.L2 5,B0
8409aca8: 003C22F6 STW.D2T2 B0,*+B15[1]
8409acac: 0056502A MVK.S2 0xffffaca0,B0
8409acb0: 004204EA MVKH.S2 0x84090000,B0
8409acb4: 00000362 B.S2 B0
8409acb8: 003C52E6 LDW.D2T2 *++B15[2],B0
8409acbc: 00006000 NOP 4
