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| author | Timofey Titovets <nefelim4ag@gmail.com> | 2025-05-19 18:24:29 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-05-19 12:24:29 -0400 |
| commit | 8c01be8c75a99f46ddb8ed9bde655ff18357fde5 (patch) | |
| tree | a152059148fc60babd82afe1ab563bd41b1e5844 | |
| parent | 3a015cd00d0ceaeb001e5777e9588394bff76a48 (diff) | |
| download | kutter-8c01be8c75a99f46ddb8ed9bde655ff18357fde5.tar.gz kutter-8c01be8c75a99f46ddb8ed9bde655ff18357fde5.tar.xz kutter-8c01be8c75a99f46ddb8ed9bde655ff18357fde5.zip | |
stm32: spi enable fifo if supported (#6936)
Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
| -rw-r--r-- | src/stm32/spi.c | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/src/stm32/spi.c b/src/stm32/spi.c index 0c90dabf..f6432681 100644 --- a/src/stm32/spi.c +++ b/src/stm32/spi.c @@ -106,9 +106,7 @@ spi_setup(uint32_t bus, uint8_t mode, uint32_t rate) gpio_peripheral(spi_bus[bus].sck_pin, spi_bus[bus].sck_af, 0); // Configure CR2 on stm32 f0/f7/g0/l4/g4 -#if CONFIG_MACH_STM32F0 || CONFIG_MACH_STM32F7 || \ - CONFIG_MACH_STM32G0 || CONFIG_MACH_STM32G4 || \ - CONFIG_MACH_STM32L4 +#ifdef SPI_CR2_FRXTH spi->CR2 = SPI_CR2_FRXTH | (7 << SPI_CR2_DS_Pos); #endif } @@ -137,15 +135,31 @@ spi_prepare(struct spi_config config) spi->CR1 = config.spi_cr1; } +#ifdef SPI_CR2_FRXTH // stm32 f0/f7/g0/l4/g4 supports buffering +#define CAN_BUFFER 1 +#else +#define CAN_BUFFER 0 +#endif + void spi_transfer(struct spi_config config, uint8_t receive_data, uint8_t len, uint8_t *data) { SPI_TypeDef *spi = config.spi; - while (len--) { - writeb((void*)&spi->DR, *data); - while (!(spi->SR & SPI_SR_RXNE)) - ; + uint8_t *wptr = data; + uint8_t *end = data + len; + while (data < end) { + if (CAN_BUFFER) { + uint32_t sr = spi->SR & (SPI_SR_TXE | SPI_SR_RXNE); + if ((sr == SPI_SR_TXE) && wptr < end) + writeb((void*)&spi->DR, *wptr++); + if (!(sr & SPI_SR_RXNE)) + continue; + } else { + writeb((void*)&spi->DR, *data); + while (!(spi->SR & SPI_SR_RXNE)) + ; + } uint8_t rdata = readb((void*)&spi->DR); if (receive_data) *data = rdata; |