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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.
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Rodrigo Garcia 2021-12-15 06:08:49 -03:00 committed by GitHub
parent 39b9e1e533
commit c2c8d18992
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 0 deletions
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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)); 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(); UART_MUTEX_UNLOCK();
uartFlush(uart); uartFlush(uart);