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stm32f1: implement spi_prepare 

Implement spi_prepare to fix the undefined behavior on SPI transaction
start.

Tested with the following command sequence:

allocate_oids count=2
config_spi oid=0 bus=0 pin=PA8 mode=3 rate=1000000 shutdown_msg=
config_spi oid=1 bus=0 pin=PA8 mode=1 rate=1000000 shutdown_msg=
spi_send oid=0 data=30313233343536373839
spi_transfer oid=1 data=3031

Discussion about this here:
https://github.com/KevinOConnor/klipper/pull/453#issuecomment-403131149

Signed-off-by: Grigori Goronzy <greg@chown.ath.cx>
This commit is contained in:
Grigori Goronzy 2018-07-08 00:22:53 +02:00 committed by KevinOConnor
parent ebd9035325
commit 2991c7a831
1 changed files with 2 additions and 3 deletions
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5
src/stm32f1/gpio.c
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@ -303,15 +303,14 @@ spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
void
spi_prepare(struct spi_config config)
{
*SPI2 = config.config;
LL_SPI_Enable(SPI2);
}
void
spi_transfer(struct spi_config config, uint8_t receive_data,
uint8_t len, uint8_t *data)
{
*SPI2 = config.config;
LL_SPI_Enable(SPI2);
while (len--) {
LL_SPI_TransmitData8(SPI2, *data);
while (!LL_SPI_IsActiveFlag_TXE(SPI2));