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microscope-ring-light-remote-sw
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Add first working draft of DMX communication

This commit is contained in:
Mario Hüttel 2022-08-09 01:12:33 +02:00
parent 446a253936
commit d3b1c8fc3f
2 changed files with 79 additions and 6 deletions
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58
dmx.c
View File

@ -51,6 +51,7 @@ void dmx_init(uint8_t *data, uint32_t universe_length, GPIO_TypeDef *tx_port, ui
dmx_tx_pin = tx_pin;
dmx_tx_port = tx_port;
dmx_data_ptr = data;
dmx_universe_length = universe_length;
dmx_tx_break_len = dmx_break_len;
dmx_tx_break_pause = break_pause;
@ -67,8 +68,9 @@ void dmx_init(uint8_t *data, uint32_t universe_length, GPIO_TypeDef *tx_port, ui
/* Two stop bits */
USART1->CR2 = USART_CR2_STOP_1;
/* Transmitter enable, USART enable */
USART1->CR1 = USART_CR1_TE | USART_CR1_UE;
/* Transmitter enable, USART enable, trawsnmission complete interrupt */
USART1->CR1 = USART_CR1_TE | USART_CR1_UE | USART_CR1_TCIE;
/* Configure TIM14 to count in 10 us steps */
TIM14->PSC = 480u;
@ -82,6 +84,10 @@ void dmx_init(uint8_t *data, uint32_t universe_length, GPIO_TypeDef *tx_port, ui
TIM14->DIER = TIM_DIER_UIE | TIM_DIER_CC1IE;
NVIC_EnableIRQ(TIM14_IRQn);
/* Enable Interrupts for USART and DMA */
NVIC_EnableIRQ(USART1_IRQn);
NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
}
@ -103,12 +109,18 @@ void dmx_stream_stop(void)
void TIM14_IRQHandler(void)
{
uint32_t sr;
sr = TIM14->SR;
/* Clear interrupt sources */
TIM14->SR = 0;
/* Start the break sequence if idle */
switch (tx_state) {
case DMX_TX_IDLE:
if (!(sr & TIM_SR_UIF))
break;
tx_state = DMX_TX_BREAK;
/* Disable the DMA transfer */
USART1->CR3 = 0ul;
@ -126,9 +138,49 @@ void TIM14_IRQHandler(void)
tx_state = DMX_TX_BREAK_PAUSE;
break;
case DMX_TX_BREAK_PAUSE:
tx_state = DMX_TX_IDLE;
/* Send null byte */
tx_state = DMX_TX_NULLBYTE;
USART1->TDR = 0x00;
break;
default:
break;
}
}
void USART1_IRQHandler(void)
{
uint32_t isr;
isr = USART1->ISR;
/* Clear interrupt flag */
USART1->ICR = USART_ICR_TCCF;
if (isr & USART_ISR_TC) {
if (tx_state == DMX_TX_NULLBYTE) {
/* Null byte transferred. Go to data state and setup DMA */
tx_state = DMX_TX_DATA;
USART1->CR3 |= USART_CR3_DMAT;
DMA1_Channel2->CPAR = (uint32_t)&USART1->TDR;
DMA1_Channel2->CMAR = (uint32_t)dmx_data_ptr;
DMA1_Channel2->CNDTR = dmx_universe_length & 0xFFFF;
DMA1_Channel2->CCR = DMA_CCR_PL_1 | DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE | DMA_CCR_EN;
}
}
}
void DMA_CH2_3_DMA2_CH1_2_IRQHandler(void)
{
uint32_t isr;
isr = DMA1->ISR;
DMA1->IFCR = isr;
if (isr & DMA_ISR_TCIF2) {
/* Channnel 2 trasnfer complete. Universe trasnferred */
tx_state = DMX_TX_IDLE;
DMA1_Channel2->CCR = 0u;
USART1->CR3 &= ~USART_CR3_DMAT;
}
}

27
main.c
View File

@ -58,6 +58,15 @@ static void setup_pins(void)
GPIOB->PUPDR = PULLUP(1);
}
static void zero_dmx_universe(void)
{
int i;
for (i = 0; i < sizeof(dmx_universe); i++) {
dmx_universe[i] = 0;
}
}
int main(void)
{
uint8_t i2c_command[2];
@ -84,6 +93,9 @@ int main(void)
dmx_stream_start();
dmx_universe[0] = 0x55;
dmx_universe[1] = 0x50;
/* Blink the LEDs */
while (1) {
systick_wait_ms(3);
@ -93,13 +105,22 @@ int main(void)
odr = GPIOA->ODR;
odr &= ~((1<<5) | (1<<6) | (1<<7));
if (port & (1<<0)) {
odr |= (1<<5);
zero_dmx_universe();
for (int i = 0; i < 32; i++) {
dmx_universe[i*4] = 0xFF;
}
}
if (port & (1<<1)) {
odr |= (1<<6);
zero_dmx_universe();
for (int i = 0; i < 32; i++) {
dmx_universe[i*4+1] = 0xFF;
}
}
if (port & (1<<2)) {
odr |= (1<<7);
zero_dmx_universe();
for (int i = 0; i < 32; i++) {
dmx_universe[i*4+2] = 0xFF;
}
}
GPIOA->ODR = odr;