jacob.eva/arduino-esp32
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Minimize HardwareSerial Receive and Transmit delays (#3664)

Browse Source 
* Minimize HardwareSerial Receive and Transmit delays

* Remove uartRxFifoToQueue from esp-hal-uart.h

Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com>
This commit is contained in:
hreintke 2020-01-26 23:38:06 +01:00 committed by Me No Dev
parent 80f9f9aeec
commit ed220bd042
1 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
cores/esp32/esp32-hal-uart.c
View File

@ -208,6 +208,11 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx
uart->dev->conf0.stop_bit_num = ONE_STOP_BITS_CONF;
uart->dev->rs485_conf.dl1_en = 1;
}
// tx_idle_num : idle interval after tx FIFO is empty(unit: the time it takes to send one bit under current baudrate)
// Setting it to 0 prevents line idle time/delays when sending messages with small intervals
uart->dev->idle_conf.tx_idle_num = 0; //
UART_MUTEX_UNLOCK();
if(rxPin != -1) {
@ -265,7 +270,7 @@ uint32_t uartAvailable(uart_t* uart)
if(uart == NULL || uart->queue == NULL) {
return 0;
}
return uxQueueMessagesWaiting(uart->queue);
return (uxQueueMessagesWaiting(uart->queue) + uart->dev->status.rxfifo_cnt) ;
}
uint32_t uartAvailableForWrite(uart_t* uart)
@ -276,12 +281,27 @@ uint32_t uartAvailableForWrite(uart_t* uart)
return 0x7f - uart->dev->status.txfifo_cnt;
}
void uartRxFifoToQueue(uart_t* uart)
{
uint8_t c;
UART_MUTEX_LOCK();
while(uart->dev->status.rxfifo_cnt || (uart->dev->mem_rx_status.wr_addr != uart->dev->mem_rx_status.rd_addr)) {
c = uart->dev->fifo.rw_byte;
xQueueSend(uart->queue, &c, 0);
}
UART_MUTEX_UNLOCK();
}
uint8_t uartRead(uart_t* uart)
{
if(uart == NULL || uart->queue == NULL) {
return 0;
}
uint8_t c;
if ((uxQueueMessagesWaiting(uart->queue) == 0) && (uart->dev->status.rxfifo_cnt > 0))
{
uartRxFifoToQueue(uart);
}
if(xQueueReceive(uart->queue, &c, 0)) {
return c;
}
@ -294,6 +314,10 @@ uint8_t uartPeek(uart_t* uart)
return 0;
}
uint8_t c;
if ((uxQueueMessagesWaiting(uart->queue) == 0) && (uart->dev->status.rxfifo_cnt > 0))
{
uartRxFifoToQueue(uart);
}
if(xQueuePeek(uart->queue, &c, 0)) {
return c;
}