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Simple speedup for spindle PWM

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This commit is contained in:
Mitch Bradley
2020-02-19 13:30:40 -10:00
parent 096d765f75
commit f7a3d03734
2 changed files with 8 additions and 2 deletions
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2
Grbl_Esp32/grbl.h
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@@ -20,7 +20,7 @@
// Grbl versioning system
#define GRBL_VERSION "1.1f"
#define GRBL_VERSION_BUILD "20200218"
#define GRBL_VERSION_BUILD "20200219"
//#include <sdkconfig.h>
#include <Arduino.h>

8
Grbl_Esp32/spindle_control.cpp
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@@ -205,8 +205,14 @@ void spindle_sync(uint8_t state, float rpm)
void grbl_analogWrite(uint8_t chan, uint32_t duty)
{
if (ledcRead(chan) != duty) // reduce unnecessary calls to ledcWrite()
// Remember the old duty cycle in memory instead of reading
// it from the I/O peripheral because I/O reads are quite
// a bit slower than memory reads.
static uint32_t old_duty = 0;
if (old_duty != duty) // reduce unnecessary calls to ledcWrite()
{
old_duty = duty;
ledcWrite(chan, duty);
}
}