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⚡️ PWM for ESP32 I2S expander (#24193)

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This commit is contained in:
John Robertson
2022-06-04 07:26:08 +01:00
committed by Scott Lahteine
parent 7677368aaf
commit c34dd64469
14 changed files with 104 additions and 46 deletions
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20
Marlin/src/HAL/ESP32/i2s.cpp
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@ -337,6 +337,26 @@ uint8_t i2s_state(uint8_t pin) {
}
void i2s_push_sample() {
// Every 4µs (when space in DMA buffer) toggle each expander PWM output using
// the current duty cycle/frequency so they sync with any steps (once
// through the DMA/FIFO buffers). PWM signal inversion handled by other functions
LOOP_L_N(p, MAX_EXPANDER_BITS) {
if (hal.pwm_pin_data[p].pwm_duty_ticks > 0) { // pin has active pwm?
if (hal.pwm_pin_data[p].pwm_tick_count == 0) {
if (TEST32(i2s_port_data, p)) { // hi->lo
CBI32(i2s_port_data, p);
hal.pwm_pin_data[p].pwm_tick_count = hal.pwm_pin_data[p].pwm_cycle_ticks - hal.pwm_pin_data[p].pwm_duty_ticks;
}
else { // lo->hi
SBI32(i2s_port_data, p);
hal.pwm_pin_data[p].pwm_tick_count = hal.pwm_pin_data[p].pwm_duty_ticks;
}
}
else
hal.pwm_pin_data[p].pwm_tick_count--;
}
}
dma.current[dma.rw_pos++] = i2s_port_data;
}