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spi: properly exchange bytes by sending and reading each byte within a SPI transaction

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This commit is contained in:
S.J.R. van Schaik 2017-06-14 14:37:22 +02:00
parent e7ad03608a
commit 85a3f84d61
1 changed files with 3 additions and 1 deletions
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4
source/drivers/stm32f0_spi.c
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@ -75,11 +75,13 @@ static int stm32f0_spi_tx_rx(struct spi_dev *dev, void *rx_buf, size_t rx_len,
gpio_clear(GPIOA, GPIO4);
for (i = 0; i < tx_len; ++i) {
spi_send8(dev->dev_id, tx ? *tx++ : 0);
spi_send8(dev->dev_id, *tx++);
(void)spi_read8(dev->dev_id);
}
if (rx_buf) {
for (i = 0; i < rx_len; ++i) {
spi_send8(dev->dev_id, 0);
*rx++ = spi_read8(dev->dev_id);
}
}