66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
#include <ring-light/dmx.h>
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#include <stm32f0xx.h>
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static volatile bool dmx_new_data_avail = false;
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static uint32_t dmx_base_channel;
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static uint8_t dmx_channel_data[DMX_USED_CHANNEL_COUNT];
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void dmx_init(uint32_t base_channel)
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{
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int i;
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uint8_t *ptr;
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dmx_new_data_avail = false;
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for (i = 0, ptr = dmx_channel_data; i < DMX_USED_CHANNEL_COUNT; i++, ptr++) {
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*ptr = 0u;
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}
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dmx_base_channel = base_channel;
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/* Enable GPIOA and USART1 clock */
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RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
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RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
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/* Switch RXTX pin low, activating permanent READ mode */
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GPIOA->MODER |= (0x1<<(2*5));
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GPIOA->BRR |= (1<<5);
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/* Switch PA10 to RX alternate function of USART1 (AF1) */
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GPIOA->MODER |= (0x2<<(2*10));
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GPIOA->AFR[1] |=(0x1<<(4*2));
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/* Set baudrate: 48MHz / 250k = 129 */
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USART1->BRR = 192u;
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USART1->CR3 = USART_CR3_EIE;
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USART1->CR2 = USART_CR2_STOP_1;
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USART1->CR1 = USART_CR1_RXNEIE | USART_CR1_RE | USART_CR1_UE;
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NVIC_EnableIRQ(USART1_IRQn);
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}
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bool dmx_new_data_available()
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{
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return dmx_new_data_avail;
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}
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const uint8_t *dmx_get_data()
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{
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return dmx_channel_data;
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}
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void USART1_IRQHandler(void)
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{
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uint32_t isr;
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volatile uint8_t dreg;
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isr = USART1->ISR;
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USART1->ICR = USART_ICR_ORECF | USART_ICR_NCF | USART_ICR_FECF;
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if (isr & USART_ISR_RXNE) {
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dreg = (uint8_t)USART1->RDR;
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dmx_channel_data[0] = dreg;
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}
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__DSB();
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}
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