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stm32-sx1280: avoid memset + memcpy for read buffer via dma

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This commit is contained in:
Matthias Ringwald 2020-10-08 23:43:09 +02:00
parent 78bb22e917
commit c0c089bbef
1 changed files with 22 additions and 19 deletions
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41
chipset/sx128x/SMTC_Drivers/sx1280-driver-c/sx1280-hal.c
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@ -132,11 +132,9 @@ const struct Radio_s Radio =
SX1280GetFrequencyError, SX1280GetFrequencyError,
}; };
#ifndef USE_BK_SPI // static uint8_t halRxBuffer[MAX_HAL_BUFFER_SIZE];
#endif static uint8_t halTxBuffer[MAX_HAL_BUFFER_SIZE];
static uint8_t halRxBuffer[MAX_HAL_BUFFER_SIZE] = {0x00}; const static uint8_t halZeroBuffer[MAX_HAL_BUFFER_SIZE];
static uint8_t halTxBuffer[MAX_HAL_BUFFER_SIZE] = {0x00};
static DioIrqHandler **dioIrqHandlers; static DioIrqHandler **dioIrqHandlers;
extern SPI_HandleTypeDef RADIO_SPI_HANDLE; extern SPI_HandleTypeDef RADIO_SPI_HANDLE;
@ -239,11 +237,10 @@ static void spi_tx_then_rx(SPI_HandleTypeDef *hspi, const uint8_t * tx_data, uin
void SX1280HalSpiTxThenRx(uint16_t tx_len, uint8_t * rx_buffer, uint16_t rx_len){ void SX1280HalSpiTxThenRx(uint16_t tx_len, uint8_t * rx_buffer, uint16_t rx_len){
// min size for dma to be faster (L073@24 Mhz) // min size for dma to be faster (L073@24 Mhz)
const uint16_t dma_tx_min_size = 8; const uint16_t dma_min_size = 8;
const uint16_t dma_tx_rx_min_size = 16;
if (rx_len == 0){ if (rx_len == 0){
if (tx_len < dma_tx_min_size) { if (tx_len < dma_min_size) {
// Custom Polling // Custom Polling
spi_tx_then_rx(&RADIO_SPI_HANDLE, halTxBuffer, tx_len, NULL, 0); spi_tx_then_rx(&RADIO_SPI_HANDLE, halTxBuffer, tx_len, NULL, 0);
} else { } else {
@ -252,21 +249,27 @@ void SX1280HalSpiTxThenRx(uint16_t tx_len, uint8_t * rx_buffer, uint16_t rx_len)
} }
} else { } else {
uint16_t total_len = tx_len + rx_len; if (rx_len < dma_min_size){
// fill TX buffer with zeros
memset(&halTxBuffer[tx_len], 0, rx_len);
if (total_len < dma_tx_rx_min_size){
// Custom Polling // Custom Polling
spi_tx_then_rx(&RADIO_SPI_HANDLE, halTxBuffer, tx_len, rx_buffer, rx_len); spi_tx_then_rx(&RADIO_SPI_HANDLE, halTxBuffer, tx_len, rx_buffer, rx_len);
} else { } else {
// Custom DMA
spi_tx_rx_dma( halTxBuffer, halRxBuffer, total_len);
// return rx data
memcpy( rx_buffer, &halRxBuffer[tx_len], rx_len );
}
// poll the first few bytes
uint8_t *tx_data = halTxBuffer;
uint8_t tx_byte = *tx_data++;
while (tx_len > 0){
tx_len--;
// while (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE) == 0);
*(__IO uint8_t *)&RADIO_SPI_HANDLE.Instance->DR = tx_byte;
tx_byte = *tx_data++;
while (__HAL_SPI_GET_FLAG(&RADIO_SPI_HANDLE, SPI_FLAG_RXNE) == 0);
uint8_t rx_byte = *(__IO uint8_t *)&RADIO_SPI_HANDLE.Instance->DR;
(void) rx_byte;
}
// Custom DMA
spi_tx_rx_dma( halZeroBuffer, rx_buffer, rx_len);
}
} }
} }