I would suggest to follow the examples available for HAL instead of trying to fit HAL functions into Arduino perspective. The methods available to you are quite different from Arduino approach. At low speeds you may even be better handling incoming data byte by byte in UART interrupt handler. In the latter you can do a loop calling blocking Receive which will either give you expected data or will time out. Serial.read(): berguna untuk membaca satu byte data yang terdapat di port serial. Jika port serial dalam keadaan kosong, maka fungsi ini dapat menghasilkan nilai nol. Serial.available () : berguna untuk menghasilkan jumlah byte di port serial yang belum terbaca. ![]() With DMA you can check for available data length as described above. Serial.end(): digunakan untuk menghentikan program akan perintah komunikasi serial. In the former case you have to use either interrupt or circular DMA versions of Receive function. If there are characters available, readStringUntil() will be called, but that will not return until a newline is available - so that is where your blocking on input is likely to be occurring. These two really define correct method of doing things in STM32.īut in general, you either need low latency communication, or you don't care how long it takes and your code has nothing to do meanwhile. You did not specify baud rate or whether or not you have variable message length. To answer your question in comments, please note that checking for available bytes in a buffer and using blocking HAL_UART_Receive call are two different approaches. You'd have to bypass that if you want to get circular DMA transfers handled without added latency. Note that current HAL implementation treats RTO as an error, eliminating the possibility to handle it properly. You can call the above code from HAL_UART_RxHalfCpltCallback, HAL_UART_RxCpltCallback and, if you have code for processing either IDLE or RTO events, from corresponding handlers as well. ProcessData(rxbuffer + rxpos, rxsize - rxpos) First process data to the end of the buffer ProcessData(rxbuffer + rxpos, pos - rxpos) Process data directly by subtracting indexes Uint32_t pos = rxsize - puart->hdmarx->Instance->CNDTR find end of data position in the RX buffer The common way to do it is: // index of first unread byte in the RX buffer Serial.AFAIK there is no similar function in HAL. Serial.print(readString) //prints string to serial port out expect a string like wer,qwe rty,123 456,hyre kjhg,Ĭhar c = Serial.read() //gets one byte from serial buffer Serial.println("serial delimit test 1.0") // so I can keep track of what is loaded A funo Serial.available() herdada da classe Stream. Esses so dados que j chegaram e foram guardados no buffer de recebimento (o qual armazena 64 bytes). Open serial monitor on both arduinos to test I was asking the same question myself and after some research I found something like that. Retorna o nmero de bytes (caracteres) disponveis para leitura da porta serial. ![]() I have to take the help of the void serialEvent () function. I could not solve your problem being only in the loop () function. ![]() What is sent to the tx arduino is received on the rx arduino. The program reads a 5, turns the LED on then off and because Serial data is still available it reads the line ending so val no longer equals 5 and the LED does not flash again. Connect the sending arduino rx pin to the receiving arduino rx pin. from serial port input (via serial monitor) zoomkat 3-5-12 simple delimited ',' string tx/rx When I enter a string into the Arduinio monitor, the string is printed on the TeraTerm, and then both monitors. If this works, then try the code with the radios instead of wires. At this point both the TeraTerm monitor and the Arduino monitor print 'mySerial.available () 0', as long as the monitors are idle. Below is some arduino to arduino test code that uses wire between the arduinos.
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