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HAL for Espressif ESP32 Wifi

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This commit is contained in:
Simon Jouet
2017-10-08 17:38:10 +01:00
committed by Scott Lahteine
parent 091f742432
commit e2aeda61ed
23 changed files with 1257 additions and 16 deletions
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41
Marlin/src/HAL/Delay.h
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@@ -21,14 +21,12 @@
*/
/**
Busy wait delay Cycles routines:
DELAY_CYCLES(count): Delay execution in cycles
DELAY_NS(count): Delay execution in nanoseconds
DELAY_US(count): Delay execution in microseconds
*/
* Busy wait delay cycles routines:
*
* DELAY_CYCLES(count): Delay execution in cycles
* DELAY_NS(count): Delay execution in nanoseconds
* DELAY_US(count): Delay execution in microseconds
*/
#ifndef MARLIN_DELAY_H
#define MARLIN_DELAY_H
@@ -37,7 +35,7 @@
#if defined(__arm__) || defined(__thumb__)
/* https://blueprints.launchpad.net/gcc-arm-embedded/+spec/delay-cycles */
// https://blueprints.launchpad.net/gcc-arm-embedded/+spec/delay-cycles
#define nop() __asm__ __volatile__("nop;\n\t":::)
@@ -60,7 +58,7 @@
);
}
/* ---------------- Delay in cycles */
// Delay in cycles
FORCE_INLINE static void DELAY_CYCLES(uint32_t x) {
if (__builtin_constant_p(x)) {
@@ -98,7 +96,7 @@
);
}
/* ---------------- Delay in cycles */
// Delay in cycles
FORCE_INLINE static void DELAY_CYCLES(uint16_t x) {
if (__builtin_constant_p(x)) {
@@ -121,15 +119,30 @@
}
#undef nop
#elif defined(ESP32)
FORCE_INLINE static void DELAY_CYCLES(uint32_t x) {
unsigned long ccount, stop;
__asm__ __volatile__ ( "rsr %0, ccount" : "=a" (ccount) );
stop = ccount + x; // This can overflow
while (ccount < stop) { // This doesn't deal with overflows
__asm__ __volatile__ ( "rsr %0, ccount" : "=a" (ccount) );
}
}
#else
#error "Unsupported MCU architecture"
#endif
/* ---------------- Delay in nanoseconds */
// Delay in nanoseconds
#define DELAY_NS(x) DELAY_CYCLES( (x) * (F_CPU/1000000L) / 1000L )
/* ---------------- Delay in microseconds */
// Delay in microseconds
#define DELAY_US(x) DELAY_CYCLES( (x) * (F_CPU/1000000L) )
#endif // MARLIN_DELAY_H