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Merge pull request #6446 from EmergReanimator/stm_spi_freq_fix 

Fixed STM SPI frequency settings.
This commit is contained in:
Dan Halbert 2022-05-29 12:20:53 -04:00 committed by GitHub
parent dc5565a5ce e8dd5d35d6
commit ebe442cd9d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 4 deletions
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12
ports/stm/common-hal/busio/SPI.c
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@ -206,6 +206,10 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
spi_clock_enable(1 << (self->sck->periph_index - 1));
reserved_spi[self->sck->periph_index - 1] = true;
// Always start at 250khz which is what SD cards need. They are sensitive to
// SPI bus noise before they are put into SPI mode.
const uint32_t default_baudrate = 250000UL;
self->handle.Instance = SPIx;
self->handle.Init.Mode = SPI_MODE_MASTER;
// Direction change only required for RX-only, see RefMan RM0090:884
@ -218,7 +222,7 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
self->handle.Init.CLKPolarity = SPI_POLARITY_LOW;
self->handle.Init.CLKPhase = SPI_PHASE_1EDGE;
self->handle.Init.NSS = SPI_NSS_SOFT;
self->handle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
self->handle.Init.BaudRatePrescaler = stm32_baud_to_spi_div(default_baudrate, &self->prescaler, get_busclock(self->handle.Instance));
self->handle.Init.FirstBit = SPI_FIRSTBIT_MSB;
self->handle.Init.TIMode = SPI_TIMODE_DISABLE;
self->handle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
@ -226,8 +230,8 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
if (HAL_SPI_Init(&self->handle) != HAL_OK) {
mp_raise_ValueError(translate("SPI init error"));
}
self->baudrate = (get_busclock(SPIx) / 16);
self->prescaler = 16;
self->baudrate = default_baudrate;
// self->prescaler = 16; // Initialised above by stm32_baud_to_spi_div
self->half_duplex = half_duplex;
self->polarity = 0;
self->phase = 0;
@ -381,7 +385,7 @@ bool common_hal_busio_spi_transfer(busio_spi_obj_t *self,
uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t *self) {
// returns actual frequency
uint32_t result = HAL_RCC_GetPCLK2Freq() / self->prescaler;
uint32_t result = get_busclock(self->handle.Instance) / self->prescaler;
return result;
}