stm32: Add support for USART3 on PC11/PC10 on STM32G474. (#6704)

Signed-off-by: Liam Powell <liam@liampwll.com>
DangerKlippers · Oct 24, 2024 · a5260c4 · a5260c4
1 parent 464fde9
commit a5260c4
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diff --git a/src/stm32/Kconfig b/src/stm32/Kconfig
@@ -423,6 +423,10 @@ choice
         bool "Serial (on USART3 PD9/PD8)" if LOW_LEVEL_OPTIONS
         depends on !MACH_STM32F0 && !MACH_STM32F401
         select SERIAL
+    config STM32_SERIAL_USART3_ALT_PC11_PC10
+        bool "Serial (on USART3 PC11/PC10)" if LOW_LEVEL_OPTIONS
+        depends on MACH_STM32G474
+        select SERIAL
     config STM32_SERIAL_UART4
         bool "Serial (on UART4 PA0/PA1)"
         depends on MACH_STM32H7

diff --git a/src/stm32/stm32f0_serial.c b/src/stm32/stm32f0_serial.c
@@ -71,6 +71,14 @@
   #define USARTx_FUNCTION GPIO_FUNCTION(CONFIG_MACH_STM32G0 ? 0 : 7)
   #define USARTx USART3
   #define USARTx_IRQn USART3_IRQn
+#elif CONFIG_STM32_SERIAL_USART3_ALT_PC11_PC10
+  //  Currently only supports STM32G474.
+  DECL_CONSTANT_STR("RESERVE_PINS_serial", "PC11,PC10");
+  #define GPIO_Rx GPIO('C', 11)
+  #define GPIO_Tx GPIO('C', 10)
+  #define USARTx_FUNCTION GPIO_FUNCTION(7)
+  #define USARTx USART3
+  #define USARTx_IRQn USART3_IRQn
 #elif CONFIG_STM32_SERIAL_UART4
   DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA1,PA0");
   #define GPIO_Rx GPIO('A', 1)