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-rw-r--r--libmaple/stm32f2/include/series/usart.h8
-rw-r--r--libmaple/stm32f2/usart.c39
2 files changed, 30 insertions, 17 deletions
diff --git a/libmaple/stm32f2/include/series/usart.h b/libmaple/stm32f2/include/series/usart.h
index 805a2b2..8936efa 100644
--- a/libmaple/stm32f2/include/series/usart.h
+++ b/libmaple/stm32f2/include/series/usart.h
@@ -37,6 +37,8 @@
extern "C"{
#endif
+#include <libmaple/gpio.h> /* for gpio_af */
+
/*
* Register map base pointers.
*/
@@ -96,6 +98,12 @@ extern struct usart_dev *UART4;
extern struct usart_dev *UART5;
extern struct usart_dev *USART6;
+/*
+ * Routines
+ */
+
+gpio_af usart_get_af(struct usart_dev *dev);
+
#ifdef __cplusplus
}
#endif
diff --git a/libmaple/stm32f2/usart.c b/libmaple/stm32f2/usart.c
index 9a1acf3..1472d13 100644
--- a/libmaple/stm32f2/usart.c
+++ b/libmaple/stm32f2/usart.c
@@ -111,23 +111,7 @@ void usart_config_gpios_async(usart_dev *udev,
gpio_dev *rx_dev, uint8 rx,
gpio_dev *tx_dev, uint8 tx,
unsigned flags) {
- gpio_af af;
- /* TODO: break this out into a user-facing function. */
- switch (udev->clk_id) {
- case RCC_USART1:
- case RCC_USART2:
- case RCC_USART3:
- af = GPIO_AF_USART_1_2_3;
- break;
- case RCC_UART4:
- case RCC_UART5:
- case RCC_USART6:
- af = GPIO_AF_USART_4_5_6;
- break;
- default:
- ASSERT(0);
- return;
- }
+ gpio_af af = usart_get_af(udev);
gpio_set_modef(rx_dev, rx, GPIO_MODE_AF, 0);
gpio_set_modef(tx_dev, tx, GPIO_MODE_AF, 0);
gpio_set_af(rx_dev, rx, af);
@@ -170,6 +154,27 @@ void usart_foreach(void (*fn)(usart_dev*)) {
fn(USART6);
}
+/**
+ * @brief Get GPIO alternate function mode for a USART.
+ * @param dev USART whose gpio_af to get.
+ * @return gpio_af corresponding to dev.
+ */
+gpio_af usart_get_af(usart_dev *dev) {
+ switch (dev->clk_id) {
+ case RCC_USART1:
+ case RCC_USART2:
+ case RCC_USART3:
+ return GPIO_AF_USART_1_2_3;
+ case RCC_UART4:
+ case RCC_UART5:
+ case RCC_USART6:
+ return GPIO_AF_USART_4_5_6;
+ default:
+ ASSERT(0); /* Can't happen */
+ return (gpio_af)-1;
+ }
+}
+
/*
* Interrupt handlers.
*/