djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge pull request #3532 from tannewt/samd21_autoreload

Browse Source 
Fix autoreload on SAMD21
This commit is contained in:
Scott Shawcroft 2020-10-09 14:49:48 -07:00 committed by GitHub
commit c7d87cea62
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 34 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
ports/atmel-samd/supervisor/port.c
View File

@ -430,6 +430,33 @@ uint32_t port_get_saved_word(void) {
static volatile uint64_t overflowed_ticks = 0;
static volatile bool _ticks_enabled = false;
static uint32_t _get_count(void) {
#ifdef SAM_D5X_E5X
while ((RTC->MODE0.SYNCBUSY.reg & (RTC_MODE0_SYNCBUSY_COUNTSYNC | RTC_MODE0_SYNCBUSY_COUNT)) != 0) {}
#endif
#ifdef SAMD21
while (RTC->MODE0.STATUS.bit.SYNCBUSY != 0) {}
#endif
return RTC->MODE0.COUNT.reg;
}
static void _port_interrupt_after_ticks(uint32_t ticks) {
uint32_t current_ticks = _get_count();
if (ticks > 1 << 28) {
// We'll interrupt sooner with an overflow.
return;
}
#ifdef SAMD21
if (hold_interrupt) {
return;
}
#endif
RTC->MODE0.COMP[0].reg = current_ticks + (ticks << 4);
RTC->MODE0.INTFLAG.reg = RTC_MODE0_INTFLAG_CMP0;
RTC->MODE0.INTENSET.reg = RTC_MODE0_INTENSET_CMP0;
}
void RTC_Handler(void) {
uint32_t intflag = RTC->MODE0.INTFLAG.reg;
if (intflag & RTC_MODE0_INTFLAG_OVF) {
@ -452,7 +479,7 @@ void RTC_Handler(void) {
supervisor_tick();
// Check _ticks_enabled again because a tick handler may have turned it off.
if (_ticks_enabled) {
port_interrupt_after_ticks(1);
_port_interrupt_after_ticks(1);
}
}
#endif
@ -462,17 +489,6 @@ void RTC_Handler(void) {
}
}
static uint32_t _get_count(void) {
#ifdef SAM_D5X_E5X
while ((RTC->MODE0.SYNCBUSY.reg & (RTC_MODE0_SYNCBUSY_COUNTSYNC | RTC_MODE0_SYNCBUSY_COUNT)) != 0) {}
#endif
#ifdef SAMD21
while (RTC->MODE0.STATUS.bit.SYNCBUSY != 0) {}
#endif
return RTC->MODE0.COUNT.reg;
}
uint64_t port_get_raw_ticks(uint8_t* subticks) {
uint32_t current_ticks = _get_count();
if (subticks != NULL) {
@ -490,7 +506,7 @@ void port_enable_tick(void) {
#endif
#ifdef SAMD21
_ticks_enabled = true;
port_interrupt_after_ticks(1);
_port_interrupt_after_ticks(1);
#endif
}
@ -505,20 +521,14 @@ void port_disable_tick(void) {
#endif
}
// This is called by sleep, we ignore it when our ticks are enabled because
// they'll wake us up earlier. If we don't, we'll mess up ticks by overwriting
// the next RTC wake up time.
void port_interrupt_after_ticks(uint32_t ticks) {
uint32_t current_ticks = _get_count();
if (ticks > 1 << 28) {
// We'll interrupt sooner with an overflow.
if (_ticks_enabled) {
return;
}
#ifdef SAMD21
if (hold_interrupt) {
return;
}
#endif
RTC->MODE0.COMP[0].reg = current_ticks + (ticks << 4);
RTC->MODE0.INTFLAG.reg = RTC_MODE0_INTFLAG_CMP0;
RTC->MODE0.INTENSET.reg = RTC_MODE0_INTENSET_CMP0;
_port_interrupt_after_ticks(ticks);
}
void port_sleep_until_interrupt(void) {