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ESP8266PWM: Annotate sources

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Add additional clarification as to the original source URL and the
specific local patches.
This commit is contained in:
Will Miles 2024-07-12 19:16:31 -04:00
parent ff39a8db3f
commit 2fc2f47d06
1 changed files with 6 additions and 0 deletions
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6
lib/ESP8266PWM/src/core_esp8266_waveform_pwm.cpp
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@ -1,6 +1,8 @@
/* esp8266_waveform imported from platform source code /* esp8266_waveform imported from platform source code
Modified for WLED to work around a fault in the NMI handling, Modified for WLED to work around a fault in the NMI handling,
which can result in the system locking up and hard WDT crashes. which can result in the system locking up and hard WDT crashes.
Imported from https://github.com/esp8266/Arduino/blob/7e0d20e2b9034994f573a236364e0aef17fd66de/cores/esp8266/core_esp8266_waveform_pwm.cpp
*/ */
/* /*
@ -497,6 +499,7 @@ static inline IRAM_ATTR uint32_t earliest(uint32_t a, uint32_t b) {
return (da < db) ? a : b; return (da < db) ? a : b;
} }
// ----- @willmmiles begin patch -----
// NMI crash workaround // NMI crash workaround
// Sometimes the NMI fails to return, stalling the CPU. When this happens, // Sometimes the NMI fails to return, stalling the CPU. When this happens,
// the next NMI gets a return address /inside the NMI handler function/. // the next NMI gets a return address /inside the NMI handler function/.
@ -519,6 +522,7 @@ static inline IRAM_ATTR void nmiCrashWorkaround() {
__asm__ __volatile__("wsr %0,epc3; wsr %1,eps3"::"a"(epc3_backup),"a"(eps3_backup)); __asm__ __volatile__("wsr %0,epc3; wsr %1,eps3"::"a"(epc3_backup),"a"(eps3_backup));
} }
} }
// ----- @willmmiles end patch -----
// The SDK and hardware take some time to actually get to our NMI code, so // The SDK and hardware take some time to actually get to our NMI code, so
@ -540,7 +544,9 @@ static inline IRAM_ATTR void nmiCrashWorkaround() {
#define MINIRQTIME microsecondsToClockCycles(6) #define MINIRQTIME microsecondsToClockCycles(6)
static IRAM_ATTR void timer1Interrupt() { static IRAM_ATTR void timer1Interrupt() {
// ----- @willmmiles begin patch -----
nmiCrashWorkaround(); nmiCrashWorkaround();
// ----- @willmmiles end patch -----
// Flag if the core is at 160 MHz, for use by adjust() // Flag if the core is at 160 MHz, for use by adjust()
bool turbo = (*(uint32_t*)0x3FF00014) & 1 ? true : false; bool turbo = (*(uint32_t*)0x3FF00014) & 1 ? true : false;