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STM32 SPI : Pull Down for output line

pull/15028/head
Jerome Coutant 2021-08-31 11:11:15 +02:00
parent 8bd27caf89
commit 066c07b234
1 changed files with 16 additions and 10 deletions
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26
targets/TARGET_STM/stm_spi_api.c
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@ -318,13 +318,14 @@ static void _spi_init_direct(spi_t *obj, const spi_pinmap_t *pinmap)
// Configure the SPI pins
pin_function(pinmap->mosi_pin, pinmap->mosi_function);
pin_mode(pinmap->mosi_pin, PullNone);
pin_mode(pinmap->mosi_pin, PullDown); // Pull Down is set for output line
pin_function(pinmap->miso_pin, pinmap->miso_function);
pin_mode(pinmap->miso_pin, PullNone);
pin_function(pinmap->sclk_pin, pinmap->sclk_function);
pin_mode(pinmap->sclk_pin, PullNone);
spiobj->pin_miso = pinmap->miso_pin;
spiobj->pin_mosi = pinmap->mosi_pin;
spiobj->pin_sclk = pinmap->sclk_pin;
@ -667,16 +668,21 @@ void spi_format(spi_t *obj, int bits, int mode, int slave)
handle->Init.NSS = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
}
handle->Init.Mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
if (slave) {
handle->Init.Mode = SPI_MODE_SLAVE;
if (slave && (handle->Init.Direction == SPI_DIRECTION_1LINE)) {
/* SPI slave implemtation in MBED does not support the 3 wires SPI.
* (e.g. when MISO is not connected). So we're forcing slave in
* 2LINES mode. As MISO is not connected, slave will only read
* from master, and cannot write to it. Inform user.
*/
debug("3 wires SPI slave not supported - slave will only read\r\n");
handle->Init.Direction = SPI_DIRECTION_2LINES;
if (handle->Init.Direction == SPI_DIRECTION_1LINE) {
/* SPI slave implemtation in MBED does not support the 3 wires SPI.
* (e.g. when MISO is not connected). So we're forcing slave in
* 2LINES mode. As MISO is not connected, slave will only read
* from master, and cannot write to it. Inform user.
*/
debug("3 wires SPI slave not supported - slave will only read\r\n");
handle->Init.Direction = SPI_DIRECTION_2LINES;
}
pin_mode(spiobj->pin_mosi, PullNone);
pin_mode(spiobj->pin_miso, PullDown); // Pull Down is set for output line
}
/*