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Implemented PWM pin user

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This commit is contained in:
Stefan de Bruijn
2020-11-07 10:23:07 +01:00
parent 314f942915
commit 2b90aff19d
1 changed files with 73 additions and 9 deletions
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82
Grbl_Esp32/src/PinUsers/PwmPin.cpp
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@@ -73,13 +73,83 @@ namespace PinUsers {
}
}
// 4. Re-assign hardware PWM channels to software channels.
// TODO: Implement
// 4. Re-assign hardware PWM channels to software channels, because we ran out of hardware pwm.
for (int i = 0; i < 3; ++i) {
for (int j = i + 1; j < 4; ++j) {
if (instances[i * 2]->frequency_ == instances[j * 2]->frequency_) {
// Only make sense if we can clear up all the hardware channel in [j],
// otherwise we save nothing:
int count = 0;
for (int chan = 0; chan < 2; ++chan) {
count += (instances[i * 2 + chan] != nullptr) ? 1 : 0;
count += (instances[i * 2 + chan + 8] != nullptr) ? 1 : 0;
count += (instances[j * 2 + chan] != nullptr) ? 1 : 0;
count += (instances[j * 2 + chan + 8] != nullptr) ? 1 : 0;
}
if (count <= 4) {
// We can move PWM channels and free up some space for more frequencies:
NativePwm* tmp[4] = { nullptr, nullptr, nullptr, nullptr };
int n = 0;
for (int chan = 0; chan < 2; ++chan) {
if (instances[i * 2 + chan] != nullptr) {
tmp[n++] = instances[i * 2 + chan];
instances[i * 2 + chan] = nullptr;
}
if (instances[i * 2 + chan + 8] != nullptr) {
tmp[n++] = instances[i * 2 + chan + 8];
instances[i * 2 + chan + 8] = nullptr;
}
if (instances[j * 2 + chan] != nullptr) {
tmp[n++] = instances[j * 2 + chan];
instances[j * 2 + chan] = nullptr;
}
if (instances[j * 2 + chan + 8] != nullptr) {
tmp[n++] = instances[j * 2 + chan + 8];
instances[j * 2 + chan + 8] = nullptr;
}
}
// Reassign:
tmp[0]->reassign(i * 2 + 0);
tmp[1]->reassign(i * 2 + 1);
tmp[2]->reassign(i * 2 + 8);
tmp[3]->reassign(i * 2 + 9);
// Now that we cleared up some space, we can try again:
return TryGrabChannel(frequency);
}
}
}
}
// 5. Nothing is available.
return -1;
}
void reassign(int target) {
auto native = pin_.getNative(Pin::Capabilities::PWM | Pin::Capabilities::Native);
// grbl_msg_sendf(CLIENT_SERIAL, MsgLevel::Info, "Assigning PWM Output Pin:%s Freq:%0.0fHz to channel %d", _pin.name().c_str(), _pwm_frequency, target);
ledcWrite(pwmChannel_, 0);
ledcDetachPin(native);
auto instances = PwmChannelResources();
instances[target] = this;
pwmChannel_ = target;
setupPwm(native);
}
void setupPwm(uint8_t native) {
resolutionBits_ = calculatePwmPrecision(frequency_);
ledcSetup(pwmChannel_, frequency_, resolutionBits_);
ledcAttachPin(native, pwmChannel_);
ledcWrite(pwmChannel_, 0);
}
public:
NativePwm(Pin pin, uint32_t frequency, uint32_t maxDuty) : pin_(pin), frequency_(frequency), maxDuty_(maxDuty) {
auto native = pin.getNative(Pin::Capabilities::PWM | Pin::Capabilities::Native);
@@ -87,13 +157,7 @@ namespace PinUsers {
pwmChannel_ = TryGrabChannel(frequency);
Assert(pwmChannel_ != -1, "PWM Channel could not be claimed. Are all PWM channels in use?");
resolutionBits_ = calculatePwmPrecision(frequency);
ledcSetup(pwmChannel_, frequency, resolutionBits_);
ledcAttachPin(native, pwmChannel_);
ledcWrite(pwmChannel_, 0);
// grbl_msg_sendf(CLIENT_SERIAL, MsgLevel::Info, "PWM Output:%d on Pin:%s Freq:%0.0fHz", _number, _pin.name().c_str(), _pwm_frequency);
setupPwm(native);
// Store instance:
auto instances = PwmChannelResources();