hueso/Sensor-Watch
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Activity

enable high-efficiency low power regulator

Browse Source
This commit is contained in:
Joey Castillo
2022-02-13 14:15:00 -05:00
parent 203850104d
commit b91f025542
3 changed files with 26 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
watch-library/hardware/watch/watch_private.c
View File

@@ -37,6 +37,18 @@ void _watch_init(void) {
SUPC->VREG.bit.SEL = 1;
while(!SUPC->STATUS.bit.VREGRDY);
// check the battery voltage...
watch_enable_adc();
uint16_t battery_voltage = watch_get_vcc_voltage();
watch_disable_adc();
// ...because we can enable the more efficient low power regulator if the system voltage is > 2.5V
// still, enable LPEFF only if the battery voltage is comfortably above this threshold.
if (battery_voltage >= 2700) {
SUPC->VREG.bit.LPEFF = 1;
} else {
SUPC->VREG.bit.LPEFF = 0;
}
// set up the brownout detector (low battery warning)
NVIC_DisableIRQ(SYSTEM_IRQn);
NVIC_ClearPendingIRQ(SYSTEM_IRQn);
@@ -47,8 +59,8 @@ void _watch_init(void) {
SUPC->BOD33.bit.RUNSTDBY = 1; // Enable sampling mode in standby
SUPC->BOD33.bit.STDBYCFG = 1; // Run in standby
SUPC->BOD33.bit.RUNBKUP = 0; // Don't run in backup mode
SUPC->BOD33.bit.PSEL = 0xB; // Check battery level every 4 seconds
SUPC->BOD33.bit.LEVEL = 31; // Detect brownout at 2.5V (1.445V + level * 34mV)
SUPC->BOD33.bit.PSEL = 0x9; // Check battery level every second (we'll change this before entering sleep)
SUPC->BOD33.bit.LEVEL = 34; // Detect brownout at 2.6V (1.445V + level * 34mV)
SUPC->BOD33.bit.ACTION = 0x2; // Generate an interrupt when BOD33 is triggered
SUPC->BOD33.bit.HYST = 0; // Disable hysteresis
while(!SUPC->STATUS.bit.B33SRDY);