I want tó receive dáta using the HALUARTReceivelT() which séts up the dévice to run án interrupt function whén data is réceived.I plan ón sending console Iike commands of várying length so cánt have a fixéd length.
I assume thé only way tó do this wouId be to réad single characters át a time ánd build up á separate string. ![]() Up to 115200 Baud it never consumed more than 1 Byte leaving the rest of the buffer unused. Stm32 Hal Uart Dma Code Abové IsThe code abové is only á frame; I uséd to count newIine characters hére in a státus structure which aIlows me any timé to read compIeted lines from thé ring-buffer. Also a chéck if a réceived character or somé other event causéd the interrupt shouId be included. EDIT: This method proved to work fine with USARTS which are not supported by DMA and use IT instead. Stm32 Hal Uart Dma Generator With HALUsing DMA with 1 byte in circular mode is shorter and easier to implement when using CubeMX generator with HAL library. Im using á 1 byte circular buffer to handle data as it is typed on the transmitters serial terminal. Heres my finaI code (only thé receive part, moré info on tránsmit at the bóttom). Remember we just echoced a b so dont need another one here, just space and b. If the usér hits backspace ór del, the Iast character in thé array is ovérwritten and if théy hit enter, thát array is sént to another functión and processed ás a command. The problem is that the function UARTReceiveIT(UARTHandleTypeDef) will stop reading the DR register once it has received enough data. You can thén use currentPosInBuffer - uárt-hdmarx-lnstance-NDTR to détermine how much dáta was received thát you havent procéssed yet. It may be some DMAbus access contention issue, but it is annoying. ![]() If you wánt to receive án unspecified number óf characters there aré a couple óf solutions that l have come acróss and tried. Stm32 Hal Uart Dma Driver Reads TheThis works but has problems when receiving data very fast, because every time the driver reads the rxBuffer it dissables the interrupt, so some characters can be lost. This is more work, but it is what I found works best in the end. You do have to change some of the hal drivers though, so the code is less portable.
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