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Diffstat (limited to 'center_fw/main.c')
-rw-r--r--center_fw/main.c139
1 files changed, 93 insertions, 46 deletions
diff --git a/center_fw/main.c b/center_fw/main.c
index a2c6eaa..71d3f00 100644
--- a/center_fw/main.c
+++ b/center_fw/main.c
@@ -30,11 +30,12 @@ void TIM1_BRK_UP_TRG_COM_Handler() {
}
void set_drv_gpios(uint8_t val) {
- int a=!!(val&1), b=!!(val&2), c=!!(val&4), d=!!(val&8);
- GPIOA->BSRR = ((!a<<3 | !b<<7 | c<<6 | d<<4)<<16) | (a<<3 | b<<7 | !c<<6 | !d<<4);
+ val = ~val;
+ int a=!(val&1), b=!(val&2), c=!(val&4), d=!(val&8);
+ GPIOA->BSRR = (((!a)<<3 | (!b)<<7 | (!c)<<6 | (!d)<<4)<<16) | ((a<<3) | (b<<7) | (c<<6) | (d<<4));
}
-uint8_t out_state = 0x01;
+uint8_t out_state = 0x0f;
void set_outputs(uint8_t val[8]) {
/* TODO implement BCM for digital brightness control */
int x = 0;
@@ -56,111 +57,157 @@ void set_load(bool load) {
}
void blank(void) {
+ GPIOA->BRR = (1<<9) | (1<<10);
set_drv_gpios(0);
}
-volatile int bit; /* FIXME */
-void unblank_low(void) {
+bool has_sync = 0;
+void unblank_low(int bit) {
if (backchannel_frame) { /* Set from protocol.c */
if (tx_next_bit() == 1)
set_load(1);
else /* 0; but also TX_IDLE */
set_load(0);
- } else {
- if (bit)
+ } else if (has_sync) {
+ if (bit) {
+ //GPIOA->BSRR = (1<<10);
set_drv_gpios(out_state & 0xf);
- else
+
+ } else {
+ //GPIOA->BSRR = (1<<9);
set_drv_gpios(out_state >> 4);
+ }
}
}
+int sync_ctr = 0xffff;
void TIM3_IRQHandler(void) {
- GPIOA->BSRR = 1<<10; /* debug */
- if (TIM3->SR & TIM_SR_UIF)
- unblank_low();
- else
+ if (TIM3->SR & TIM_SR_CC2IF) {
+ if (sync_ctr > 10)
+ has_sync = 0;
+ else
+ sync_ctr += 1;
+ EXTI->IMR = (1<<0);
+ GPIOB->BSRR = (1<<1);
+ GPIOA->BRR = (1<<9) | (1<<10);
+
+ } else if (TIM3->SR & TIM_SR_CC3IF) {
+ int bit = GPIOA->IDR & (1<<5); /* Sample current polarity */
+ unblank_low(!bit);
+
+ } else {
blank();
+ }
TIM3->SR = 0;
- GPIOA->BRR = 1<<10; /* debug */
+}
+
+void EXTI0_1_IRQHandler(void) {
+ static uint32_t jitter_meas_sum = 0, jitter_meas_cnt = 0;
+ EXTI->PR = (1<<0);
+
+ /* Store old counter value for jitter measurement. Let it overflow to handle negative offsets. */
+ int16_t cnt = (int16_t)TIM3->CNT;
+ /* Re-initialize the counter to align it with the signal edge */
+ TIM3->EGR |= TIM_EGR_UG;
+
+ /* Don't handle overflow of _sum here since this value is only for monitoring anyway */
+ jitter_meas_sum += (cnt >= 0) ? cnt : -cnt;
+ if (++jitter_meas_cnt == 1000) { /* One measurement roughly every 800ms */
+ jitter_meas_avg_ns = jitter_meas_sum;
+ }
+
+ EXTI->IMR = 0;
+ GPIOB->BRR = (1<<1);
+ has_sync = 1;
+ sync_ctr = 0;
}
int main(void) {
- RCC->CR |= RCC_CR_HSEON;
- while (!(RCC->CR&RCC_CR_HSERDY));
+ //RCC->CR |= RCC_CR_HSEON;
+ //while (!(RCC->CR&RCC_CR_HSERDY));
RCC->CFGR &= ~RCC_CFGR_PLLMUL_Msk & ~RCC_CFGR_SW_Msk & ~RCC_CFGR_PPRE_Msk & ~RCC_CFGR_HPRE_Msk;
- RCC->CFGR |= ((6-2)<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC_HSE_PREDIV; /* PLL x6 -> 48.0MHz */
+ RCC->CFGR |= ((12-2)<<RCC_CFGR_PLLMUL_Pos); /* PLL / 2 * 12 -> 48.0MHz */
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR&RCC_CR_PLLRDY));
RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
SystemCoreClockUpdate();
- //SysTick_Config(SystemCoreClock/1000); /* 1ms interval */
+ SysTick_Config(SystemCoreClock/1000); /* 1ms interval */
/* Turn on lots of neat things */
- RCC->AHBENR |= RCC_AHBENR_DMAEN | RCC_AHBENR_GPIOAEN | RCC_AHBENR_FLITFEN;
+ RCC->AHBENR |= RCC_AHBENR_DMAEN | RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN | RCC_AHBENR_FLITFEN;
RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN | RCC_APB2ENR_ADCEN| RCC_APB2ENR_DBGMCUEN | RCC_APB2ENR_TIM1EN | RCC_APB2ENR_TIM1EN;;
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN;
/* TIM3 foo */
TIM3->CCMR2 = (6<<TIM_CCMR2_OC4M_Pos); /* PWM Mode 1 to get a clean trigger signal */
TIM3->CCER = TIM_CCER_CC4E; /* Enable capture/compare unit 4 connected to ADC */
+ TIM3->CCER = TIM_CCER_CC3E; /* Enable capture/compare unit 3 for unblank interrupt */
+ TIM3->CCER = TIM_CCER_CC2E;
TIM3->PSC = 48-1; /* 48MHz -> 1MHz */
- TIM3->CCR4 = 170-1; /* CC4 is ADC trigger, fire 30us before end of cycle. */
- TIM3->ARR = 200-1; /* 1MHz -> 5kHz */
+ TIM3->CCR2 = 800-1-1;
+ TIM3->CCR3 = 100-1; /* CC3 is used for unblanking in the ISR, fires 30us after beginning of cycle. */
+ TIM3->CCR4 = 800-100-1; /* CC4 is ADC trigger, fire 30us before end of cycle. */
+ TIM3->ARR = 800-1; /* 1MHz -> 5kHz */
- TIM3->DIER |= TIM_DIER_UIE | TIM_DIER_CC4IE;
+ TIM3->DIER |= TIM_DIER_CC2IE | TIM_DIER_CC3IE | TIM_DIER_CC4IE | TIM_DIER_UIE;
TIM3->CR1 |= TIM_CR1_CEN;
NVIC_EnableIRQ(TIM3_IRQn);
NVIC_SetPriority(TIM3_IRQn, 3<<5);
+ GPIOB->MODER |= (1<<GPIO_MODER_MODER1_Pos);
+ GPIOB->OSPEEDR |= (2<<GPIO_OSPEEDR_OSPEEDR1_Pos);
+
+ EXTI->IMR = (1<<0); /* PA0 Vmeas_A for sync */
+ EXTI->RTSR |= (1<<0);
+ NVIC_EnableIRQ(EXTI0_1_IRQn);
+ NVIC_SetPriority(EXTI0_1_IRQn, 4<<5);
+
GPIOA->MODER |=
(0<<GPIO_MODER_MODER0_Pos) /* PA0 - Vmeas_A to ADC */
- | (0<<GPIO_MODER_MODER1_Pos) /* PA1 - Vmeas_B to ADC */
+ | (0<<GPIO_MODER_MODER1_Pos) /* PA1 - Unused */
| (1<<GPIO_MODER_MODER2_Pos) /* PA2 - LOAD */
| (1<<GPIO_MODER_MODER3_Pos) /* PA3 - CH0 */
| (1<<GPIO_MODER_MODER4_Pos) /* PA4 - CH3 */
- | (1<<GPIO_MODER_MODER5_Pos) /* PA5 - TP1 */
+ | (0<<GPIO_MODER_MODER5_Pos) /* PA5 - TP1 */
| (1<<GPIO_MODER_MODER6_Pos) /* PA6 - CH2 */
| (1<<GPIO_MODER_MODER7_Pos) /* PA7 - CH1 */
- | (1<<GPIO_MODER_MODER9_Pos) /* PA9 - TP2 */
- | (1<<GPIO_MODER_MODER10_Pos);/* PA10 - TP3 */
+ | (1<<GPIO_MODER_MODER9_Pos) /* PA9 - synchronous rectifier bypass A */
+ | (1<<GPIO_MODER_MODER10_Pos);/* PA10 - synchronous rectifier bypass B */
+
+ GPIOA->PUPDR |= (2<<GPIO_PUPDR_PUPDR5_Pos);
/* Set shift register IO GPIO output speed */
GPIOA->OSPEEDR |=
(2<<GPIO_OSPEEDR_OSPEEDR2_Pos) /* LOAD */
| (2<<GPIO_OSPEEDR_OSPEEDR3_Pos) /* CH0 */
- | (2<<GPIO_OSPEEDR_OSPEEDR4_Pos) /* CH3 */
+ | (2<<GPIO_OSPEEDR_OSPEEDR4_Pos) /* CH3 */
| (2<<GPIO_OSPEEDR_OSPEEDR6_Pos) /* CH2 */
- | (2<<GPIO_OSPEEDR_OSPEEDR7_Pos); /* CH1 */
+ | (2<<GPIO_OSPEEDR_OSPEEDR7_Pos) /* CH1 */
+ | (2<<GPIO_OSPEEDR_OSPEEDR9_Pos) /* synchronous rectifier bypass A */
+ | (2<<GPIO_OSPEEDR_OSPEEDR10_Pos); /* synchronous rectifier bypass B */
set_drv_gpios(0);
protocol_init();
- uint32_t jitter_meas_sum = 0, jitter_meas_cnt = 0;
+ int cnt = 0;
+ int seg_c = 0;
while (42) {
- int new = GPIOA->IDR & (1<<0); /* Sample current polarity */
- if (new != bit) { /* Zero-crossing detected */
- bit = new;
-
- /* Store old counter value for jitter measurement. Let it overflow to handle negative offsets. */
- int16_t cnt = (int16_t)TIM3->CNT;
- /* Re-initialize the counter to align it with the signal edge */
- TIM3->EGR |= TIM_EGR_UG;
- /* Unblank since the update interrupt will not fire this time */
- unblank_low();
-
- /* Don't handle overflow of _sum here since this value is only for monitoring anyway */
- jitter_meas_sum += (cnt >= 0) ? cnt : -cnt;
- if (++jitter_meas_cnt == 4000) { /* One measurement roughly every 800ms */
- /* Divide aggregate over 4000 us-resolution measurements by 4 -> ns-resolution average */
- uint32_t divided = jitter_meas_sum>>2;
- jitter_meas_avg_ns = (divided < UINT16_MAX) ? divided : UINT16_MAX;
- }
+ /*
+ if (cnt > 10000) {
+ cnt = 0;
+ seg_c += 1;
+ if (seg_c == 8)
+ seg_c = 0;
+ set_outputs_binary(1<<seg_c, 255);
+ } else {
+ cnt = cnt+1;
}
+ */
/* idle */
}
}
generated by cgit (git 2.34.1) at 2024-11-24 17:35:52 +0000