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msp432p401lp-cc256x: raise RTS if DMA uses different buffer

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This commit is contained in:
Matthias Ringwald 2020-11-22 22:26:23 +01:00
parent 3ae54f9db5
commit 992f9cc193
1 changed files with 15 additions and 4 deletions
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19
port/msp432p401lp-cc256x/main.c
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@ -313,6 +313,17 @@ static uint16_t hal_dma_rx_bytes_avail(uint8_t buffer, uint16_t offset){
return HAL_DMA_RX_BUFFER_SIZE - MAP_DMA_getChannelSize(channel) - offset;
}
static void hal_uart_dma_update_rts(void){
// get active transfer
uint32_t attribute = MAP_DMA_getChannelAttribute(DMA_CH5_EUSCIA2RX & 0x0F);
uint8_t active_transfer_buffer = (attribute & UDMA_ATTR_ALTSELECT) ? 1 : 0;
if (hal_dma_rx_active_buffer == active_transfer_buffer){
GPIO_setOutputLowOnPin(BLUETOOTH_CTS_PORT, BLUETOOTH_CTS_PIN);
} else {
GPIO_setOutputHighOnPin(BLUETOOTH_CTS_PORT, BLUETOOTH_CTS_PIN);
}
}
// directly called from timer or similar interrupt. to call from non-isr context, interrupts must be disabled
static void hal_uart_dma_harvest(void){
if (bytes_to_read == 0) {
@ -336,7 +347,7 @@ static void hal_uart_dma_harvest(void){
hal_dma_rx_offset = 0;
hal_dma_rx_start_transfer(hal_dma_rx_active_buffer);
hal_dma_rx_active_buffer = 1 - hal_dma_rx_active_buffer;
GPIO_setOutputLowOnPin(BLUETOOTH_CTS_PORT, BLUETOOTH_CTS_PIN);
hal_uart_dma_update_rts();
}
if (bytes_to_read == 0){
@ -354,9 +365,9 @@ void DMA_INT1_IRQHandler(void)
void DMA_INT2_IRQHandler(void)
{
MAP_DMA_clearInterruptFlag(DMA_CH5_EUSCIA2RX & 0x0F);
// raise our RTS
GPIO_setOutputHighOnPin(BLUETOOTH_CTS_PORT, BLUETOOTH_CTS_PIN);
// update RTS
hal_uart_dma_update_rts();
// process data
hal_uart_dma_harvest();
}