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Better handling of DELAY_NS and DELAY_US (#10716)

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Co-Authored-By: ejtagle <ejtagle@hotmail.com>
This commit is contained in:
Scott Lahteine
2018-05-12 08:34:04 -05:00
committed by GitHub
parent f5aaa2d6c0
commit a1062eec5b
21 changed files with 273 additions and 268 deletions
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22
Marlin/src/HAL/HAL_LPC1768/arduino.cpp
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@@ -26,6 +26,7 @@
#include <lpc17xx_pinsel.h>
#include "../../inc/MarlinConfig.h"
#include "../Delay.h"
// Interrupts
void cli(void) { __disable_irq(); } // Disable
@@ -40,26 +41,9 @@ uint32_t millis() {
return _millis;
}
// This is required for some Arduino libraries we are using
void delayMicroseconds(uint32_t us) {
static const int nop_factor = (SystemCoreClock / 11000000);
static volatile int loops = 0;
//previous ops already burned most of 1us, burn the rest
loops = nop_factor / 4; //measured at 1us
while (loops > 0) --loops;
if (us < 2) return;
us--;
//redirect to delay for large values, then set new delay to remainder
if (us > 1000) {
delay(us / 1000);
us = us % 1000;
}
// burn cycles, time in interrupts will not be taken into account
loops = us * nop_factor;
while (loops > 0) --loops;
DELAY_US(us);
}
extern "C" void delay(const int msec) {