diff options
Diffstat (limited to 'src/stm32f4/spi.c')
| -rw-r--r-- | src/stm32f4/spi.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/stm32f4/spi.c b/src/stm32f4/spi.c index a7e96874..f8852be9 100644 --- a/src/stm32f4/spi.c +++ b/src/stm32f4/spi.c @@ -19,10 +19,12 @@ spi_setup(uint32_t bus, uint8_t mode, uint32_t rate) shutdown("Invalid spi bus"); // Enable SPI - enable_pclock(SPI2_BASE); - gpio_peripheral(GPIO('B', 14), GPIO_FUNCTION(5), 1); - gpio_peripheral(GPIO('B', 15), GPIO_FUNCTION(5), 0); - gpio_peripheral(GPIO('B', 13), GPIO_FUNCTION(5), 0); + if (!is_enabled_pclock(SPI2_BASE)) { + enable_pclock(SPI2_BASE); + gpio_peripheral(GPIO('B', 14), GPIO_FUNCTION(5), 1); + gpio_peripheral(GPIO('B', 15), GPIO_FUNCTION(5), 0); + gpio_peripheral(GPIO('B', 13), GPIO_FUNCTION(5), 0); + } // Calculate CR1 register uint32_t pclk = get_pclock_frequency(SPI2_BASE); |