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add watchdog support
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jenstrange committed Mar 3, 2018
1 parent 8f0add9 commit 9b8472e
Showing 1 changed file with 14 additions and 3 deletions.
17 changes: 14 additions & 3 deletions board/pedal/main.c
Original file line number Diff line number Diff line change
Expand Up @@ -117,10 +117,11 @@ uint32_t timeout = 0;
uint32_t current_index = 0;

#define STATE_GOOD 0
#define STATE_FAULT_CHECKSUM 1
#define STATE_FAULT_BAD_CHECKSUM 1
#define STATE_FAULT_SEND 2
#define STATE_FAULT_SCE 3
uint8_t state = STATE_NONE;
#define STATE_FAULT_STARTUP 4
uint8_t state = STATE_FAULT_STARTUP;

void CAN1_RX0_IRQHandler() {
while (CAN->RF0R & CAN_RF0R_FMP0) {
Expand Down Expand Up @@ -157,7 +158,7 @@ void CAN1_RX0_IRQHandler() {
current_index = index;
} else {
// wrong checksum = fault
state = STATE_FAULT_CHECKSUM;
state = STATE_FAULT_BAD_CHECKSUM;
}
}
// next
Expand Down Expand Up @@ -234,6 +235,9 @@ void pedal() {
dac_set(0, pdl0);
dac_set(1, pdl1);
}

// feed the watchdog
IWDG->KR = 0xAAAA;
}

int main() {
Expand Down Expand Up @@ -267,6 +271,13 @@ int main() {

NVIC_EnableIRQ(TIM3_IRQn);

// setup watchdog
IWDG->KR = 0x5555;
IWDG->PR = 0; // divider /4
// 0 = 0.125 ms, let's have a 50ms watchdog
IWDG->RLR = 400 - 1;
IWDG->KR = 0xCCCC;

puts("**** INTERRUPTS ON ****\n");
__enable_irq();

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