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| author | Timofey Titovets <nefelim4ag@gmail.com> | 2025-05-22 23:41:47 +0200 |
|---|---|---|
| committer | KevinOConnor <kevin@koconnor.net> | 2025-05-26 18:44:29 -0400 |
| commit | 07b3726d31c528402fffaa7537e45edb507b8fca (patch) | |
| tree | 75917a2eedbbc2d463ee2c1e3947822830ae0908 /src | |
| parent | 28a4baf95cf5bb24b4697f85c67badab42b4a9f8 (diff) | |
| download | kutter-07b3726d31c528402fffaa7537e45edb507b8fca.tar.gz kutter-07b3726d31c528402fffaa7537e45edb507b8fca.tar.xz kutter-07b3726d31c528402fffaa7537e45edb507b8fca.zip | |
stm32: h7 spi - add a delay on SCK polarity change
Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/stm32/stm32h7_spi.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/stm32/stm32h7_spi.c b/src/stm32/stm32h7_spi.c index 9e5aef5b..0f49b5e9 100644 --- a/src/stm32/stm32h7_spi.c +++ b/src/stm32/stm32h7_spi.c @@ -9,6 +9,7 @@ #include "gpio.h" // spi_setup #include "internal.h" // gpio_peripheral #include "sched.h" // sched_shutdown +#include "board/misc.h" // timer_is_before struct spi_info { SPI_TypeDef *spi; @@ -113,8 +114,14 @@ spi_prepare(struct spi_config config) // Load frequency spi->CFG1 = (div << SPI_CFG1_MBR_Pos) | (7 << SPI_CFG1_DSIZE_Pos); // Load mode - spi->CFG2 = ((mode << SPI_CFG2_CPHA_Pos) | SPI_CFG2_MASTER | SPI_CFG2_SSM - | SPI_CFG2_AFCNTR | SPI_CFG2_SSOE); + uint32_t cfg2 = ((mode << SPI_CFG2_CPHA_Pos) | SPI_CFG2_MASTER + | SPI_CFG2_SSM | SPI_CFG2_AFCNTR | SPI_CFG2_SSOE); + uint32_t diff = spi->CFG2 ^ cfg2; + spi->CFG2 = cfg2; + uint32_t end = timer_read_time() + timer_from_us(1); + if (diff & SPI_CFG2_CPOL_Msk) + while (timer_is_before(timer_read_time(), end)) + ; } void |