mhu/microscope-ring-light
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Implement first draft of working DMX. Still needs rework and beatifying

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This commit is contained in:
Mario Hüttel
2022-06-24 19:43:00 +02:00
parent d06b2b7eaf
commit 60f1923abe
3 changed files with 114 additions and 36 deletions
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73
firmware/dmx.c
View File

@@ -8,15 +8,14 @@ enum dmx_rx_state_enum {
DMX_RX_DATA,
};
static volatile bool break_received;
/**
* @brief DMX data received. Contains the whole DMX universe including the first 0 byte.
* The controller does check the first byte to be zero.
*/
static volatile uint8_t dmx_channel_data[DMX_UNIVERSE_SIZE + 1];
static volatile enum dmx_rx_state_enum dmx_rx_state;
static volatile uint32_t dmx_write_pointer;
void dmx_init(uint32_t base_channel)
{
int i;
@@ -27,11 +26,10 @@ void dmx_init(uint32_t base_channel)
}
dmx_base_channel = base_channel;
dmx_write_pointer = 0u;
dmx_rx_state = DMX_RX_WAIT_FOR_BREAK;
break_received = false;
/* Enable GPIOA and USART1 clock */
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_DMAEN;
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
/* Switch RXTX pin low, activating permanent READ mode */
@@ -51,49 +49,78 @@ void dmx_init(uint32_t base_channel)
/* Map USART1 RX to DMA Channel 3 */
SYSCFG->CFGR1 &= ~SYSCFG_CFGR1_USART1RX_DMA_RMP;
DMA1_Channel3->CCR = DMA_CCR_PL_1 | DMA_CCR_MINC | DMA_CCR_TCIE;
NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
NVIC_EnableIRQ(USART1_IRQn);
}
const uint8_t *dmx_get_data()
{
return (const uint8_t *)&dmx_channel_data[1];
return (const uint8_t *)dmx_channel_data;
}
void USART1_IRQHandler(void)
{
uint32_t isr;
uint8_t dreg;
isr = USART1->ISR;
USART1->ICR = USART_ICR_ORECF | USART_ICR_NCF | USART_ICR_FECF;
if (isr & USART_ISR_FE) {
/* Frame error received. Start of DMX frame */
dmx_write_pointer = 0u;
dmx_rx_state = DMX_RX_DATA;
/* Flush RX data */
USART1->RQR = USART_RQR_RXFRQ;
USART1->CR3 |= USART_CR3_DMAR;
DMA1_Channel3->CCR &= ~DMA_CCR_EN;
DMA1_Channel3->CMAR = (uint32_t)dmx_channel_data;
DMA1_Channel3->CPAR = (uint32_t)&USART1->RDR;
DMA1_Channel3->CNDTR = DMX_UNIVERSE_SIZE + 1;
DMA1_Channel3->CCR |= DMA_CCR_EN;
USART1->CR3 |= USART_CR3_DMAR;
break_received = true;
} else if (isr & USART_ISR_RXNE) {
/* Received valid symbol */
dreg = (uint8_t)USART1->RDR;
if (dmx_rx_state == DMX_RX_DATA) {
/* Ready to recieve data */
if (dmx_write_pointer < (DMX_UNIVERSE_SIZE + 1)) {
dmx_channel_data[dmx_write_pointer] = dreg;
dmx_write_pointer++;
} else {
dmx_rx_state = DMX_RX_WAIT_FOR_BREAK;
}
}
}
__DSB();
}
void DMA_CH2_3_DMA2_CH1_2_IRQHandler()
void DMA_CH2_3_DMA2_CH1_2_IRQHandler(void)
{
uint32_t isr;
isr = DMA1->ISR;
/* Only clear the interupts of channel 2 (bits 11:9) */
DMA1->IFCR = isr & 0xF00;
if (isr & DMA_ISR_TCIF3) {
DMA1->ISR;
}
__DSB();
}
bool dmx_poll_break_received(void)
{
bool ret;
/* Atomically reset the flag */
__disable_irq();
ret = break_received;
break_received = false;
__enable_irq();
return ret;
}
bool dmx_enough_data_received()
{
uint32_t received_count = (DMX_UNIVERSE_SIZE + 1) - DMA1_Channel3->CNDTR;
if (received_count > (dmx_base_channel + DMX_USED_CHANNEL_COUNT)) {
return true;
}
return false;
}

12
firmware/include/ring-light/dmx.h
View File

@@ -34,4 +34,16 @@ void dmx_init(uint32_t base_channel);
*/
const uint8_t *dmx_get_data(void);
/**
* @brief Check if a break was received. This resets the flag
* @return true if a break was received since the last time calling this function
*/
bool dmx_poll_break_received(void);
/**
* @brief The DMX receiver has received all data for the ring light. It can be read
* @return
*/
bool dmx_enough_data_received(void);
#endif /* _DMX_H_ */

65
firmware/main.c
View File

@@ -16,7 +16,9 @@ enum ring_modes {
RING_MODE_ARC, /*!< SK6812 closing ring */
RING_MODE_QUARTER, /*!< SK6812 walking quarter */
RING_MODE_IN_FARBE_UND_BUNT, /*!< SK6812 color mix */
RING_MODE_MAX /*!< end of list */
RING_MODE_MAX, /*!< end of list */
RING_MODE_WAIT_DMX,
RING_MODE_WAIT_DMX_BREAK
};
volatile int32_t temperature;
@@ -34,10 +36,13 @@ static void wait_for_ticks(uint32_t ticks)
int main(void)
{
uint32_t led_val = 0x00UL;
uint32_t last_led_val = 0x00UL;
uint32_t led_calc_val[RING_MAX_LED] = {0x00UL};
uint8_t led_pwm_val = 0u;
const uint8_t *dmx_data;
bool button_pressed = false;
bool force_led_update;
enum ring_modes mode;
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
@@ -88,14 +93,23 @@ int main(void)
SysTick_Config(800000);
while(1) {
force_led_update = false;
temperature = temperature_adc_get_temp();
if (led_val != last_led_val || button_pressed) {
force_led_update = true;
}
/*! -# Gradually dim down the LED brightness in case the temperature is too high */
if (temperature > ((MAX_TEMP_CELSIUS) * 10)) {
if (led_val > 20)
led_val--;
}
if (dmx_poll_break_received()) {
mode = RING_MODE_WAIT_DMX;
}
led_pwm_val = 0u;
switch (mode)
{
@@ -165,6 +179,26 @@ int main(void)
}
}
break;
case RING_MODE_WAIT_DMX:
force_led_update = false;
if (dmx_enough_data_received()) {
dmx_data = dmx_get_data();
mode = RING_MODE_WAIT_DMX_BREAK;
if (dmx_data[0] != 0)
break;
for (int i = 0; i < RING_MAX_LED; i++) {
led_calc_val[i] = (dmx_data[1 + i*4 + 3]) |
(dmx_data[1 + i*4 + 2] << 8) |
(dmx_data[1 + i*4 + 0] << 16) |
(dmx_data[1 + i*4 + 1] << 24);
}
led_pwm_val = dmx_data[129];
force_led_update = true;
}
break;
case RING_MODE_WAIT_DMX_BREAK:
force_led_update = false;
break;
default:
for(int i = 0; i < RING_MAX_LED; i ++) {
led_calc_val[i] = 0x00000000UL;
@@ -172,30 +206,35 @@ int main(void)
break;
}
TIM14->CCR1 = led_pwm_val;
if (force_led_update) {
TIM14->CCR1 = led_pwm_val;
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();
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();
}
last_led_val = led_val;
}
wait_for_ticks(5);
if((int16_t)TIM3->CNT > (int16_t)led_val) {
led_val = 0u;
}
else if(((int16_t)led_val - (int16_t)TIM3->CNT) > UINT8_MAX) {
} else if(((int16_t)led_val - (int16_t)TIM3->CNT) > UINT8_MAX) {
led_val = 255u;
}
else {
} else {
led_val = (int16_t)led_val - (int16_t)TIM3->CNT;
}
TIM3->CNT = 0u;
if(button_pressed) {
if(GPIOA->IDR & GPIO_IDR_0) {
button_pressed = false;