Implement Uart RX functionality. UART RX works. DMX frame detection not yet implemented.

This commit is contained in:
Mario Hüttel 2022-06-21 22:04:44 +02:00
parent 4166396f75
commit 3faab7173c
3 changed files with 113 additions and 3 deletions

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@ -1 +1,65 @@
#include <ring-light/dmx.h>
#include <stm32f0xx.h>
static volatile bool dmx_new_data_avail = false;
static uint32_t dmx_base_channel;
static uint8_t dmx_channel_data[DMX_USED_CHANNEL_COUNT];
void dmx_init(uint32_t base_channel)
{
int i;
uint8_t *ptr;
dmx_new_data_avail = false;
for (i = 0, ptr = dmx_channel_data; i < DMX_USED_CHANNEL_COUNT; i++, ptr++) {
*ptr = 0u;
}
dmx_base_channel = base_channel;
/* Enable GPIOA and USART1 clock */
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
/* Switch RXTX pin low, activating permanent READ mode */
GPIOA->MODER |= (0x1<<(2*5));
GPIOA->BRR |= (1<<5);
/* Switch PA10 to RX alternate function of USART1 (AF1) */
GPIOA->MODER |= (0x2<<(2*10));
GPIOA->AFR[1] |=(0x1<<(4*2));
/* Set baudrate: 48MHz / 250k = 129 */
USART1->BRR = 192u;
USART1->CR3 = USART_CR3_EIE;
USART1->CR2 = USART_CR2_STOP_1;
USART1->CR1 = USART_CR1_RXNEIE | USART_CR1_RE | USART_CR1_UE;
NVIC_EnableIRQ(USART1_IRQn);
}
bool dmx_new_data_available()
{
return dmx_new_data_avail;
}
const uint8_t *dmx_get_data()
{
return dmx_channel_data;
}
void USART1_IRQHandler(void)
{
uint32_t isr;
volatile uint8_t dreg;
isr = USART1->ISR;
USART1->ICR = USART_ICR_ORECF | USART_ICR_NCF | USART_ICR_FECF;
if (isr & USART_ISR_RXNE) {
dreg = (uint8_t)USART1->RDR;
dmx_channel_data[0] = dreg;
}
__DSB();
}

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@ -1,4 +1,43 @@
#ifndef _DMX_H_
#define _DMX_H_
#include <stdint.h>
#include <stdbool.h>
#define DMX_UNIVERSE_SIZE (255u)
#define DMX_USED_CHANNEL_COUNT (129u)
/**
* @brief Init DMX reception
*
* DMX data is received from the base channel onwards:
* - R LED1
* - G LED1
* - B LED1
* - W LED1
* - R LED2
* ...
* - W LED32
* - W DISCRETE
*
* In Sum: 129 8 bit channels
*
* @param base_channel Base channel the ring light will listen on
*/
void dmx_init(uint32_t base_channel);
/**
* @brief Has new DMX data been received?
* @return true if new data is available
*/
bool dmx_new_data_available(void);
/**
* @brief Returns the array of the 129 DMX channels
* @return
*/
const uint8_t *dmx_get_data(void);
#endif /* _DMX_H_ */

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@ -2,6 +2,7 @@
#include <cmsis/core_cm0.h>
#include <stdbool.h>
#include <ring-light/temp-adc.h>
#include <ring-light/dmx.h>
#define RING_MAX_LED 32u
#define MAX_TEMP_CELSIUS 70
@ -37,7 +38,7 @@ int main(void)
uint8_t led_pwm_val = 0u;
bool button_pressed = false;
enum ring_modes mode = RING_MODE_ALL;
enum ring_modes mode;
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN | RCC_APB1ENR_TIM14EN;
@ -83,6 +84,7 @@ int main(void)
mode = RING_MODE_WHITE_DISCRETE;
temperature_adc_init();
dmx_init(0u);
SysTick_Config(800000);
while(1) {
@ -171,11 +173,16 @@ int main(void)
}
TIM14->CCR1 = led_pwm_val;
__disable_irq();
for(int i = 0; i < RING_MAX_LED; i ++) {
/* Allow interrupts in between LEDs.
* They must not exceed the reset length of 80us of SK6812.
*/
__disable_irq();
sk6812_send_led(led_calc_val[i]);
__enable_irq();
}
__enable_irq();
wait_for_ticks(5);
if((int16_t)TIM3->CNT > (int16_t)led_val) {