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Fix for Serial flush() returning before transmission has completed #328

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Fix for Serial flush() returning before transmission has completed #328

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c77faa4
Update Serial.h
Hsubtnarg May 28, 2024
96a369f
Update Serial.cpp
Hsubtnarg May 28, 2024
f35ad4e
Update Serial.cpp
Hsubtnarg May 29, 2024
d54ce05
Update Serial.cpp
Hsubtnarg Jun 5, 2024
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27 changes: 16 additions & 11 deletions cores/arduino/Serial.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -58,12 +58,14 @@ void UART::WrapperCallback(uart_callback_args_t *p_args) {
{
break;
}
case UART_EVENT_TX_COMPLETE:
case UART_EVENT_TX_DATA_EMPTY:
case UART_EVENT_TX_COMPLETE: // This is call when the transmission is complete
{
//uint8_t to_enqueue = uart_ptr->txBuffer.available() < uart_ptr->uart_ctrl.fifo_depth ? uart_ptr->txBuffer.available() : uart_ptr->uart_ctrl.fifo_depth;
//while (to_enqueue) {
uart_ptr->tx_done = true;
uart_ptr->tx_complete = true;
break;
}
case UART_EVENT_TX_DATA_EMPTY: // This is called when the buffer is empty
{
uart_ptr->tx_empty = true;
break;
}
case UART_EVENT_RX_CHAR:
Expand Down Expand Up @@ -109,9 +111,10 @@ bool UART::setUpUartIrqs(uart_cfg_t &cfg) {
size_t UART::write(uint8_t c) {
/* -------------------------------------------------------------------------- */
if(init_ok) {
tx_done = false;
tx_empty = false;
tx_complete = false;
R_SCI_UART_Write(&uart_ctrl, &c, 1);
while (!tx_done) {}
while (!tx_empty) {}
return 1;
}
else {
Expand All @@ -121,9 +124,10 @@ size_t UART::write(uint8_t c) {

size_t UART::write(uint8_t* c, size_t len) {
if(init_ok) {
tx_done = false;
tx_empty = false;
tx_complete = false;
R_SCI_UART_Write(&uart_ctrl, c, len);
while (!tx_done) {}
while (!tx_empty) {}
return len;
}
else {
Expand Down Expand Up @@ -322,7 +326,8 @@ int UART::read() {
/* -------------------------------------------------------------------------- */
void UART::flush() {
/* -------------------------------------------------------------------------- */
while(txBuffer.available());
unsigned long time = millis();
while(!tx_complete && (millis() - time < _timeout)) {}
}

/* -------------------------------------------------------------------------- */
Expand All @@ -335,4 +340,4 @@ size_t UART::write_raw(uint8_t* c, size_t len) {
i++;
}
return len;
}
}
3 changes: 2 additions & 1 deletion cores/arduino/Serial.h
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,8 @@ class UART : public arduino::HardwareSerial {
arduino::SafeRingBufferN<SERIAL_BUFFER_SIZE> rxBuffer;
arduino::SafeRingBufferN<SERIAL_BUFFER_SIZE> txBuffer;

volatile bool tx_done;
volatile bool tx_empty;
volatile bool tx_complete;

sci_uart_instance_ctrl_t uart_ctrl;
uart_cfg_t uart_cfg;
Expand Down
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