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annotate SLEEPCFG-register detail

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Alex Maestas 2024-01-22 00:37:25 +00:00
parent af49d3cfcb
commit a2a60eb31a
1 changed files with 7 additions and 1 deletions
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8
watch-library/hardware/hal/src/hal_sleep.c
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@ -57,7 +57,13 @@ 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 chip doc.
// 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();