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89 lines
1.7 KiB
89 lines
1.7 KiB
7 years ago
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#ifdef PANDA
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int relay_control = 0; // True if relay is controlled through l-line
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/* Conrol a relay connected to l-line pin */
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// 160us cycles, 1 high, 25 low
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volatile int turn_on_relay = 0;
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volatile int on_cycles = 25;
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//5s timeout
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#define LLINE_TIMEOUT_CYCLES 31250
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volatile int timeout_cycles = LLINE_TIMEOUT_CYCLES;
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void TIM5_IRQHandler(void) {
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if (TIM5->SR & TIM_SR_UIF) {
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on_cycles--;
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timeout_cycles--;
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if (timeout_cycles == 0) {
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turn_on_relay = 0;
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}
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if (on_cycles > 0) {
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if (turn_on_relay) {
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set_gpio_output(GPIOC, 10, 0);
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}
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}
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else {
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set_gpio_output(GPIOC, 10, 1);
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on_cycles = 25;
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}
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}
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TIM5->ARR = 160-1;
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TIM5->SR = 0;
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}
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void lline_relay_init (void) {
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set_lline_output(0);
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relay_control = 1;
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set_gpio_output(GPIOC, 10, 1);
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// setup
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TIM5->PSC = 48-1; // tick on 1 us
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TIM5->CR1 = TIM_CR1_CEN; // enable
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TIM5->ARR = 50-1; // 50 us
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TIM5->DIER = TIM_DIER_UIE; // update interrupt
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TIM5->CNT = 0;
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NVIC_EnableIRQ(TIM5_IRQn);
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#ifdef DEBUG
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puts("INIT LLINE\n");
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puts(" SR ");
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putui(TIM5->SR);
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puts(" PSC ");
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putui(TIM5->PSC);
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puts(" CR1 ");
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putui(TIM5->CR1);
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puts(" ARR ");
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putui(TIM5->ARR);
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puts(" DIER ");
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putui(TIM5->DIER);
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puts(" SR ");
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putui(TIM5->SR);
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puts(" CNT ");
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putui(TIM5->CNT);
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puts("\n");
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#endif
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}
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void lline_relay_release (void) {
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set_lline_output(0);
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relay_control = 0;
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puts("RELEASE LLINE\n");
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set_gpio_alternate(GPIOC, 10, GPIO_AF7_USART3);
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NVIC_DisableIRQ(TIM5_IRQn);
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}
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void set_lline_output(int to_set) {
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timeout_cycles = LLINE_TIMEOUT_CYCLES;
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turn_on_relay = to_set;
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}
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int get_lline_status() {
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return turn_on_relay;
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}
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#endif
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