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TARGET_STM: SPI: update pull up config depending on clk polarity #10804

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Merged
merged 1 commit into from
Jun 14, 2019
Merged

TARGET_STM: SPI: update pull up config depending on clk polarity #10804

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14 changes: 14 additions & 0 deletions targets/TARGET_STM/stm_spi_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -216,6 +216,12 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
handle->Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
#endif

/*
* According the STM32 Datasheet for SPI peripheral we need to PULLDOWN
* or PULLUP the SCK pin according the polarity used.
*/
pin_mode(spiobj->pin_sclk, (handle->Init.CLKPolarity == SPI_POLARITY_LOW) ? PullDown: PullUp);

init_spi(obj);
}

Expand Down Expand Up @@ -290,6 +296,7 @@ void spi_format(spi_t *obj, int bits, int mode, int slave)
{
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
PinMode pull = 0;

DEBUG_PRINTF("spi_format, bits:%d, mode:%d, slave?:%d\r\n", bits, mode, slave);

Expand Down Expand Up @@ -331,6 +338,13 @@ void spi_format(spi_t *obj, int bits, int mode, int slave)
handle->Init.Direction = SPI_DIRECTION_2LINES;
}

/*
* According the STM32 Datasheet for SPI peripheral we need to PULLDOWN
* or PULLUP the SCK pin according the polarity used.
*/
pull = (handle->Init.CLKPolarity == SPI_POLARITY_LOW) ? PullDown: PullUp;
pin_mode(spiobj->pin_sclk, pull);

init_spi(obj);
}

Expand Down