stm: add __WFI to sys_tick delay.

2013-12-06 00:42:13 +00:00 · 2013-12-06 00:42:13 +00:00 · 261dbf8ce5
commit 261dbf8ce5
parent d6b4c66565
1 changed files with 2 additions and 0 deletions
--- a/stm/systick.c
+++ b/stm/systick.c
@ -33,10 +33,12 @@ void sys_tick_wait_at_least(uint32_t stc, uint32_t delay_ms) {
    if (stc_wait < stc) {
        // stc_wait wrapped around
        while (stc <= sys_tick_counter || sys_tick_counter < stc_wait) {
+            __WFI(); // enter sleep mode, waiting for interrupt
        }
    } else {
        // stc_wait did not wrap around
        while (stc <= sys_tick_counter && sys_tick_counter < stc_wait) {
+            __WFI(); // enter sleep mode, waiting for interrupt
        }
    }
 }