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SPI: Fix prescaler at low baudrates #794

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Merged
merged 2 commits into from
Nov 27, 2019
Merged

SPI: Fix prescaler at low baudrates #794

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858699c
Fix prescaler at low baudrates
LinoBarreca Nov 26, 2019
cca16e3
Modified comment and removed double check
LinoBarreca Nov 26, 2019
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4 changes: 2 additions & 2 deletions cores/arduino/stm32/spi_com.c
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Original file line number Diff line number Diff line change
Expand Up @@ -215,8 +215,8 @@ void spi_init(spi_t *obj, uint32_t speed, spi_mode_e mode, uint8_t msb)
handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
} else if (speed >= (spi_freq / SPI_SPEED_CLOCK_DIV256_MHZ)) {
handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
} else {
handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
} else { //speed is lower than (spi_freq / SPI_SPEED_CLOCK_DIV256_MHZ). we can't go below this.
handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256; // Set prescaler at max value so we have the lowest frequency possible
}

handle->Init.Direction = SPI_DIRECTION_2LINES;
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