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Allow waveforms to be specified in clock cycles #7211

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Apr 16, 2020
Merged

Allow waveforms to be specified in clock cycles #7211

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8f92812
Allow waveforms to be specified in clock cycles
earlephilhower Apr 13, 2020
6001e1d
Cycle-accurate wafveform to specify Tone periods
earlephilhower Apr 13, 2020
5e24fc7
Merge branch 'master' into wvf-to-cycles
devyte Apr 15, 2020
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14 changes: 9 additions & 5 deletions cores/esp8266/core_esp8266_waveform.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -112,15 +112,19 @@ void setTimer1Callback(uint32_t (*fn)()) {
// waveform smoothly on next low->high transition. For immediate change, stopWaveform()
// first, then it will immediately begin.
int startWaveform(uint8_t pin, uint32_t timeHighUS, uint32_t timeLowUS, uint32_t runTimeUS) {
if ((pin > 16) || isFlashInterfacePin(pin)) {
return startWaveformCycles(pin, microsecondsToClockCycles(timeHighUS), microsecondsToClockCycles(timeLowUS), microsecondsToClockCycles(runTimeUS));
}

int startWaveformCycles(uint8_t pin, uint32_t timeHighCycles, uint32_t timeLowCycles, uint32_t runTimeCycles) {
if ((pin > 16) || isFlashInterfacePin(pin)) {
return false;
}
Waveform *wave = &waveform[pin];
// Adjust to shave off some of the IRQ time, approximately
wave->nextTimeHighCycles = microsecondsToClockCycles(timeHighUS);
wave->nextTimeLowCycles = microsecondsToClockCycles(timeLowUS);
wave->expiryCycle = runTimeUS ? GetCycleCount() + microsecondsToClockCycles(runTimeUS) : 0;
if (runTimeUS && !wave->expiryCycle) {
wave->nextTimeHighCycles = timeHighCycles;
wave->nextTimeLowCycles = timeLowCycles;
wave->expiryCycle = runTimeCycles ? GetCycleCount() + runTimeCycles : 0;
if (runTimeCycles && !wave->expiryCycle) {
wave->expiryCycle = 1; // expiryCycle==0 means no timeout, so avoid setting it
}

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2 changes: 2 additions & 0 deletions cores/esp8266/core_esp8266_waveform.h
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Expand Up @@ -50,6 +50,8 @@ extern "C" {
// If runtimeUS > 0 then automatically stop it after that many usecs.
// Returns true or false on success or failure.
int startWaveform(uint8_t pin, uint32_t timeHighUS, uint32_t timeLowUS, uint32_t runTimeUS);
// Same as above, but pass in CPU clock cycles instead of microseconds
int startWaveformCycles(uint8_t pin, uint32_t timeHighCycles, uint32_t timeLowCycles, uint32_t runTimeCycles);
// Stop a waveform, if any, on the specified pin.
// Returns true or false on success or failure.
int stopWaveform(uint8_t pin);
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5 changes: 3 additions & 2 deletions cores/esp8266/core_esp8266_wiring_pwm.cpp
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Expand Up @@ -25,6 +25,7 @@
#include "core_esp8266_waveform.h"

extern "C" {
#include "user_interface.h"

static uint32_t analogMap = 0;
static int32_t analogScale = PWMRANGE;
Expand All @@ -50,7 +51,7 @@ extern void __analogWrite(uint8_t pin, int val) {
if (pin > 16) {
return;
}
uint32_t analogPeriod = 1000000L / analogFreq;
uint32_t analogPeriod = (1000000L * system_get_cpu_freq()) / analogFreq;
if (val < 0) {
val = 0;
} else if (val > analogScale) {
Expand All @@ -68,7 +69,7 @@ extern void __analogWrite(uint8_t pin, int val) {
stopWaveform(pin);
digitalWrite(pin, LOW);
} else {
if (startWaveform(pin, high, low, 0)) {
if (startWaveformCycles(pin, high, low, 0)) {
analogMap |= (1 << pin);
}
}
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