diff options
Diffstat (limited to 'watch-library/hardware/watch/watch.c')
| -rw-r--r-- | watch-library/hardware/watch/watch.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/watch-library/hardware/watch/watch.c b/watch-library/hardware/watch/watch.c index 934d5623..32bbccbb 100644 --- a/watch-library/hardware/watch/watch.c +++ b/watch-library/hardware/watch/watch.c @@ -27,7 +27,13 @@ // receives interrupts from MCLK, OSC32KCTRL, OSCCTRL, PAC, PM, SUPC and TAL, whatever that is. void SYSTEM_Handler(void) { if (SUPC->INTFLAG.bit.BOD33DET) { + // Our system voltage has dipped below 2.6V! + // Set the voltage regulator to work at low system voltage before we hit 2.5 V + // This voltage regulator can carry us down to 1.62 volts as the battery drains. + SUPC->VREG.bit.LPEFF = 0; + // clear the interrupt condition SUPC->INTENCLR.bit.BOD33DET = 1; + // and disable the brownout detector (TODO: add a second, "power critical" brownout condition?) SUPC->INTFLAG.reg &= ~SUPC_INTFLAG_BOD33DET; } } |