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TARGET_STM: SPI: add pulse on master transmissions 

Add a pulse when using hardware chip select for SPI transmissions.
CS is at low level when a transmission is on-going.

Be careful, this is not compatible with all modes. It will work only
if PHA is 0, ie spi mode is 0 or 2. See stm32xx reference manual,
chapter "NSS pulse mode" for more details.

Fix #10671

Signed-off-by: Vincent Veron <vincent.veron@st.com>
pull/10708/head
Vincent Veron 2019-05-29 16:33:39 +02:00
parent 19e762298f
commit 16475829f1
1 changed files with 6 additions and 1 deletions
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7
targets/TARGET_STM/stm_spi_api.c
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@ -182,8 +182,14 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
if (ssel != NC) {
pinmap_pinout(ssel, PinMap_SPI_SSEL);
handle->Init.NSS = SPI_NSS_HARD_OUTPUT;
#if defined(SPI_NSS_PULSE_ENABLE)
handle->Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
#endif
} else {
handle->Init.NSS = SPI_NSS_SOFT;
#if defined(SPI_NSS_PULSE_DISABLE)
handle->Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
#endif
}
/* Fill default value */
@ -206,7 +212,6 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
handle->Init.TIMode = SPI_TIMODE_DISABLE;
#if TARGET_STM32H7
handle->Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
handle->Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;
handle->Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
#endif