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Swag at handling PWM invert in hardware

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TODO:
1. if it works, do the same for other users of LEDC
2. Remove invert_pwm
This commit is contained in:
Mitch Bradley
2021-06-24 08:14:16 -10:00
parent 76493e0cf8
commit bb53280341
1 changed files with 10 additions and 1 deletions
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11
Grbl_Esp32/src/Spindles/PWMSpindle.cpp
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@@ -28,6 +28,8 @@
#include "../GCode.h" // gc_state.modal #include "../GCode.h" // gc_state.modal
#include "../Logging.h" #include "../Logging.h"
extern "C" void __pinMode(uint8_t pin, uint8_t mode);
// ======================= PWM ============================== // ======================= PWM ==============================
/* /*
This gets called at startup or whenever a spindle setting changes This gets called at startup or whenever a spindle setting changes
@@ -62,7 +64,14 @@ namespace Spindles {
auto outputNative = _output_pin.getNative(Pin::Capabilities::PWM); auto outputNative = _output_pin.getNative(Pin::Capabilities::PWM);
ledcSetup(_pwm_chan_num, (double)_pwm_freq, _pwm_precision); // setup the channel ledcSetup(_pwm_chan_num, (double)_pwm_freq, _pwm_precision); // setup the channel
ledcAttachPin(outputNative, _pwm_chan_num); // attach the PWM to the pin
// This is equivalent to ledcAttachPin with the addition of
// using the hardware inversion function in the GPIO matrix.
// We use that to apply the active low function in hardware.
__pinMode(outputNative, OUTPUT);
uint8_t function = ((_pwm_chan_num / 8) ? LEDC_LS_SIG_OUT0_IDX : LEDC_HS_SIG_OUT0_IDX) + (_pwm_chan_num % 8);
bool isActiveLow = _output_pin.getAttr().has(Pin::Attr::ActiveLow);
pinMatrixOutAttach(outputNative, function, isActiveLow, false);
_enable_pin.setAttr(Pin::Attr::Output); _enable_pin.setAttr(Pin::Attr::Output);
_direction_pin.setAttr(Pin::Attr::Output); _direction_pin.setAttr(Pin::Attr::Output);