From 0fbfbef3cacb03b184bd0432de2def1893388e22 Mon Sep 17 00:00:00 2001
From: CYFS <2805686936@qq.com>
Date: Wed, 16 Sep 2026 00:07:43 +0800
Subject: [PATCH] [bsp][gd32] Fix USART TX and RX GPIO initialization

Configure TX as alternate-function push-pull and RX as pull-up input on GD32E50x/F10x/F20x/F30x. Remove the GPIO API alias that incorrectly configured both pins as general-purpose push-pull outputs.
---
 bsp/gd32/arm/libraries/gd32_drivers/drv_usart.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/bsp/gd32/arm/libraries/gd32_drivers/drv_usart.c b/bsp/gd32/arm/libraries/gd32_drivers/drv_usart.c
index 610cf8eb2480..5cb9d6b9dd64 100644
--- a/bsp/gd32/arm/libraries/gd32_drivers/drv_usart.c
+++ b/bsp/gd32/arm/libraries/gd32_drivers/drv_usart.c
@@ -24,8 +24,6 @@
 #endif
 
 #if defined(SOC_SERIES_GD32E50x) || defined(SOC_SERIES_GD32F10x) || defined(SOC_SERIES_GD32F20x) || defined(SOC_SERIES_GD32F30x)
-    #define gpio_output_options_set   gpio_init
-    #define GPIO_OTYPE                GPIO_MODE_OUT_PP
     #define GPIO_OSPEED               GPIO_OSPEED_50MHZ
 #elif defined(SOC_SERIES_GD32H7xx) || defined(SOC_SERIES_GD32H75E)
     #define GPIO_OTYPE                GPIO_OTYPE_PP
@@ -485,14 +483,18 @@ void gd32_uart_gpio_init(struct gd32_uart *uart)
     /* configure USART Tx as alternate function push-pull */
 #if !defined(SOC_SERIES_GD32E50x) && !defined(SOC_SERIES_GD32F10x) && !defined(SOC_SERIES_GD32F20x) && !defined(SOC_SERIES_GD32F30x)
     gpio_mode_set(tx_port, GPIO_MODE_AF, GPIO_PUPD_PULLUP, tx_pin);
-#endif
     gpio_output_options_set(tx_port, GPIO_OTYPE, GPIO_OSPEED, tx_pin);
+#else
+    gpio_init(tx_port, GPIO_MODE_AF_PP, GPIO_OSPEED, tx_pin);
+#endif
 
-    /* configure USART Rx as alternate function push-pull */
+    /* configure USART Rx as input with pull-up */
 #if !defined(SOC_SERIES_GD32E50x) && !defined(SOC_SERIES_GD32F10x) && !defined(SOC_SERIES_GD32F20x) && !defined(SOC_SERIES_GD32F30x)
     gpio_mode_set(rx_port, GPIO_MODE_AF, GPIO_PUPD_PULLUP, rx_pin);
-#endif
     gpio_output_options_set(rx_port, GPIO_OTYPE, GPIO_OSPEED, rx_pin);
+#else
+    gpio_init(rx_port, GPIO_MODE_IPU, GPIO_OSPEED, rx_pin);
+#endif
 
     NVIC_SetPriority(uart->irqn, 0);
     NVIC_EnableIRQ(uart->irqn);