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Forces UART Flush() to wait until all bits are sent (#6026)

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HardwareSerial flush() was returning before all data was sent out through serial port.
This is a problem to some RS485 libraries that depend on it to signaling.

This PR solves the issue by forcing it to block flush() until all data is sent.
This commit is contained in:
Rodrigo Garcia
2021-12-15 06:08:49 -03:00
committed by GitHub
parent 39b9e1e533
commit c2c8d18992
1 changed files with 3 additions and 0 deletions
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3
cores/esp32/esp32-hal-uart.c
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@ -140,6 +140,9 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx
ESP_ERROR_CHECK(uart_set_line_inverse(uart_nr, UART_SIGNAL_TXD_INV | UART_SIGNAL_RXD_INV));
}
// Set RS485 half duplex mode on UART. This shall force flush to wait up to sending all bits out
ESP_ERROR_CHECK(uart_set_mode(uart_nr, UART_MODE_RS485_HALF_DUPLEX));
UART_MUTEX_UNLOCK();
uartFlush(uart);