Wednesday, July 31, 2019
Use PWM_PERIOD_HZ/PWM_DUTY_FRACTION to generate PWM for TI CC26xx/CC13xx devices.
You can replace the following mainThread function call in pwmled2 example to use PWM_PERIOD_HZ/PWM_DUTY_FRACTION to generate PWM for TI CC26xx/CC13xx devices.
void *mainThread(void *arg0)
{
/* Period and duty in microseconds */
uint16_t pwmPeriod = 1000; //1K Hz PWM
uint16_t pwmDutyRatio = 0; //Init PWM Duty Ratio
uint16_t pwmDutyRatioInc = 5; //PWM Duty Ratio increase every time
uint16_t pwmDutyRatioMax= 50; //Max PWM Duty Ratio
pwmDutyRatio = (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100);
/* Sleep time in microseconds */
uint32_t time = 50000;
PWM_Handle pwm1 = NULL;
PWM_Handle pwm2 = NULL;
PWM_Params params;
/* Call driver init functions. */
PWM_init();
PWM_Params_init(¶ms);
params.dutyUnits = PWM_DUTY_FRACTION;
params.dutyValue = (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100);
params.periodUnits = PWM_PERIOD_HZ;
params.periodValue = pwmPeriod;
pwm1 = PWM_open(Board_PWM0, ¶ms);
if (pwm1 == NULL) {
/* Board_PWM0 did not open */
while (1);
}
PWM_start(pwm1);
pwm2 = PWM_open(Board_PWM1, ¶ms);
if (pwm2 == NULL) {
/* Board_PWM0 did not open */
while (1);
}
PWM_start(pwm2);
/* Loop forever incrementing the PWM duty */
while (1) {
PWM_setDuty(pwm1, (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100));
PWM_setDuty(pwm2, (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100));
pwmDutyRatio = (pwmDutyRatio + pwmDutyRatioInc);
if (pwmDutyRatio == pwmDutyRatioMax || (!pwmDutyRatio)) {
pwmDutyRatioInc = - pwmDutyRatioInc;
}
usleep(time);
}
}
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