ESP32 MCPWM Funktion

[Welle 🧐 S. (w3llschmidt)]

Hallo Interessierte,

ich verstehe nicht, wie das PWM hier Vorwaerts und Rueckwaerts steuert?

https://github.com/espressif/esp-idf/blob/master/examples/peripherals/mcpwm/mcpwm_brushed_dc_control/main/mcpwm_brushed_dc_control_example.c

/**
 * @brief motor moves in forward direction, with duty cycle = duty %
 */
static void brushed_motor_forward(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num , float duty_cycle)
{
    mcpwm_set_signal_low(mcpwm_num, timer_num, MCPWM_OPR_B);
    mcpwm_set_duty(mcpwm_num, timer_num, MCPWM_OPR_A, duty_cycle);
    mcpwm_set_duty_type(mcpwm_num, timer_num, MCPWM_OPR_A, MCPWM_DUTY_MODE_0); //call this each time, if operator was previously in low/high state
}

/**
 * @brief motor moves in backward direction, with duty cycle = duty %
 */
static void brushed_motor_backward(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num , float duty_cycle)
{
    mcpwm_set_signal_low(mcpwm_num, timer_num, MCPWM_OPR_A);
    mcpwm_set_duty(mcpwm_num, timer_num, MCPWM_OPR_B, duty_cycle);
    mcpwm_set_duty_type(mcpwm_num, timer_num, MCPWM_OPR_B, MCPWM_DUTY_MODE_0);  //call this each time, if operator was previously in low/high state
}

Ich habe eine passende H-Bruecke, dass funtioniert 1A, allerdings muss 
ich zwei PINs high/low setzen. Kein Drama und funktioniert super. Aber 
was ist die Idee hinter dem Beispielcode?

[Brain 2.0 (Gast)]

Das Steuern geschieht sicher über die 3 Anweisungen der einzelnen 
Funktionen, die ja unterschiedlich sind.