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stmhal: Fix RTC.wakeup so it correctly calculates WUT for large periods. 

Thanks to Peter Hinch.  Addresses issue #1488.
This commit is contained in:
Damien George 2015-10-08 12:41:12 +01:00
parent fd38799049
commit 2a8d7ee0f8
1 changed files with 11 additions and 5 deletions
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16
stmhal/rtc.c
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@ -419,17 +419,23 @@ mp_obj_t pyb_rtc_wakeup(mp_uint_t n_args, const mp_obj_t *args) {
if (div <= 16) {
wut = 32768 / div * ms / 1000;
} else {
// use 1Hz clock
wucksel = 4;
wut = ms / 1000;
if (ms > 0x10000) {
wucksel = 5;
ms -= 0x10000;
if (ms > 0x10000) {
if (wut > 0x10000) {
// wut too large for 16-bit register, try to offset by 0x10000
wucksel = 6;
wut -= 0x10000;
if (wut > 0x10000) {
// wut still too large
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "wakeup value too large"));
}
}
}
wut -= 1;
// wut register should be 1 less than desired value, but guard against wut=0
if (wut > 0) {
wut -= 1;
}
enable = true;
}
if (n_args == 3) {