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main: first NEC decoding

This commit is contained in:
King Kévin 2022-10-12 17:34:27 +02:00
parent 68a096be7b
commit 058ab29990
1 changed files with 16 additions and 13 deletions
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29
main.c
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@ -382,8 +382,8 @@ void time_isr(void) __interrupt(IRQ_TIM4)
// IR capture timer counter
void nec_uo_isr(void) __interrupt(IRQ_TIM1_UO)
{
if (TIM1->SR1.fields.UIF) { // slot longer than NEC slot
nec_bit = -2; // set to invalid message
if (TIM1->SR1.fields.UIF) { // timer overflow
nec_bit = -2; // set to invalid message since it took longer than NEC slot
TIM1->SR1.fields.UIF = 0; // clear flag
}
}
@ -394,20 +394,12 @@ void nec_cc_isr(void) __interrupt(IRQ_TIM1_CC)
static uint32_t nec_bits = 0; // temporary buffer to construct message
if (TIM1->SR1.fields.CC1IF) { // start of burst
const uint16_t slot = (TIM1->CCR1H.reg << 8) + TIM1->CCR1L.reg;
nec_bit++; // start the bit
if (0 == nec_bit) { // AGC received
if (-1 == nec_bit) { // AGC received
nec_bits = 0; // reset message
if (slot < NEC_AGC_SLOT_MIN || slot > NEC_AGC_SLOT_MAX) {
nec_bit = -2; // slot invalid
}
} else if (32 == nec_bit) { // trailing pulse received
nec_msg[0] = (nec_bits >> 0); // save message
nec_msg[1] = (nec_bits >> 8); // save message
nec_msg[2] = (nec_bits >> 16); // save message
nec_msg[3] = (nec_bits >> 24); // save message
nec_flag = true; // notify we received a message
nec_bit = -2; // restart message
} else if (nec_bit > 0) {
} else if (nec_bit >= 0 && nec_bit < 32) {
if (slot >= NEC_0_SLOT_MIN && slot <= NEC_0_SLOT_MAX) {
// bit should already be 0
} else if (slot >= NEC_1_SLOT_MIN && slot <= NEC_1_SLOT_MAX) {
@ -416,9 +408,20 @@ void nec_cc_isr(void) __interrupt(IRQ_TIM1_CC)
nec_bit = -2; // slot invalid
}
}
nec_bit++; // start the bit
TIM1->SR1.fields.CC1IF = 0; // clear flag
}
if (TIM1->SR1.fields.CC2IF) {
if (TIM1->SR1.fields.CC2IF) { // start of pause
if (32 == nec_bit) {
nec_msg[0] = (nec_bits >> 0); // save message
nec_msg[1] = (nec_bits >> 8); // save message
nec_msg[2] = (nec_bits >> 16); // save message
nec_msg[3] = (nec_bits >> 24); // save message
nec_flag = true; // notify we received a message
nec_bit = -2; // restart message
} else if (nec_bit >= 0) {
// here we could verify the burst length
}
TIM1->SR1.fields.CC2IF = 0; // clear flag
}
}