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Diffstat (limited to 'watch-library/hardware/hal/src')
| -rw-r--r-- | watch-library/hardware/hal/src/hal_sleep.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/watch-library/hardware/hal/src/hal_sleep.c b/watch-library/hardware/hal/src/hal_sleep.c index 89472f15..2fac64d5 100644 --- a/watch-library/hardware/hal/src/hal_sleep.c +++ b/watch-library/hardware/hal/src/hal_sleep.c @@ -57,6 +57,15 @@ int sleep(const uint8_t mode) if (ERR_NONE != _set_sleep_mode(mode)) return ERR_INVALID_ARG; + // wait for the mode set to actually take, per note in Microchip data + // sheet DS60001465, section 19.8.2: + // + // A small latency happens between the store instruction and actual + // writing of the SLEEPCFG register due to bridges. Software has to make + // sure the SLEEPCFG register reads the wanted value before issuing WFI + // instruction. + while(_get_sleep_mode() != mode); + _go_to_sleep(); return ERR_NONE; |