STM32L1 SPI DMA Receive half duplex (no HAL, only LL) Hi All, My environment: STM32L151CB, SPI2 Master, DMA1 Chan4(RX) and Chan5(TX)I moved from HAL to LL (to save memory) and faced with the following issue:When I configure SPI to receive data by DMA and setup only RX DMA channel SPI transaction doesn't start but if I setup RX+TX channels it's work but sometimes I lost one RX byte and DMA RX Complete never call! //Doesnt' work
while (LL_SPI_IsActiveFlag_RXNE(SPI2)) {
LL_SPI_ReceiveData8(SPI2);
}
LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_4,
LL_SPI_DMA_GetRegAddr(SPI2),
(uint32_t)rx,
LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_4));
LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_4, size);
LL_SPI_EnableDMAReq_RX(SPI2);
LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_4);//Works but sometimes I lost one RX byte and DMA Rx Complete doesn't call! DMA Ch5 CNT=0, DMA Ch4 CNT=1, start size 512 bytes
while (LL_SPI_IsActiveFlag_RXNE(SPI2)) {
LL_SPI_ReceiveData8(SPI2);
}
LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_4,
L
