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

Simplify STM a bit.

Browse Source
This commit is contained in:
Scott Shawcroft 2020-03-24 15:49:24 -07:00
parent 5e1e4d32db
commit ea0ce39962
No known key found for this signature in database
GPG Key ID: 9349BC7E64B1921E
1 changed files with 1 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
ports/stm/supervisor/port.c
View File

@ -72,8 +72,7 @@ safe_mode_t port_init(void) {
_hrtc.Instance = RTC; _hrtc.Instance = RTC;
_hrtc.Init.HourFormat = RTC_HOURFORMAT_24; _hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
// Divide async as little as possible so that we have RTC_CLOCK_FREQUENCY count in subseconds. // Divide async as little as possible so that we have RTC_CLOCK_FREQUENCY count in subseconds.
// This ensures our timing > 1 second is correct. We fudge < 1 second because there will only be // This ensures our timing > 1 second is correct.
// 1000 subticks with a 32.000k crystal.
_hrtc.Init.AsynchPrediv = 0x0; _hrtc.Init.AsynchPrediv = 0x0;
_hrtc.Init.SynchPrediv = RTC_CLOCK_FREQUENCY - 1; _hrtc.Init.SynchPrediv = RTC_CLOCK_FREQUENCY - 1;
_hrtc.Init.OutPut = RTC_OUTPUT_DISABLE; _hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
@ -218,12 +217,6 @@ void port_interrupt_after_ticks(uint32_t ticks) {
} else { } else {
alarm.AlarmMask = RTC_ALARMMASK_NONE; alarm.AlarmMask = RTC_ALARMMASK_NONE;
} }
// Fudge subseconds if we're running a 32k crystal.
#if RTC_CLOCK_FREQUENCY == 32000
if (raw_ticks % 1024 > 1000) {
raw_ticks -= 24;
}
#endif
alarm.AlarmTime.SubSeconds = RTC_CLOCK_FREQUENCY - alarm.AlarmTime.SubSeconds = RTC_CLOCK_FREQUENCY -
((raw_ticks % (1024)) * 32); ((raw_ticks % (1024)) * 32);