pwm t4

PWM output using hardware timer 4 at a fixed frequency of 97.65 Hz
Author: Johannes Taelman
License: BSD
Github: gpio/out/pwm t4.axo

Inlets

frac32.positive pwm ratio

frac32.positive pwm ratio

Outlets

None

Init
static const PWMConfig pwmcfg = {400000, /* 400kHz PWM clock frequency.  */
                                 4096,   /* PWM period is 128 cycles.    */
                                 NULL,
                                 {{PWM_OUTPUT_ACTIVE_HIGH, NULL},
                                  {PWM_OUTPUT_ACTIVE_HIGH, NULL},
                                  {PWM_OUTPUT_ACTIVE_HIGH, NULL},
                                  {PWM_OUTPUT_ACTIVE_HIGH, NULL}},
                                 /* HW dependent part.*/
                                 0};

pwmStart(&PWMD4, &pwmcfg);
palSetPadMode(GPIOB, 8, PAL_MODE_ALTERNATE(2));
palSetPadMode(GPIOB, 9, PAL_MODE_ALTERNATE(2));
Control Rate
pwmEnableChannel(&PWMD4, 2, (pwmcnt_t)(inlet_pb8 >= 0 ? inlet_pb8 >> 15 : 0));
pwmEnableChannel(&PWMD4, 3, (pwmcnt_t)(inlet_pb9 >= 0 ? inlet_pb9 >> 15 : 0));
Dispose
pwmStop(&PWMD4);

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