gpio struct with example

ch32v003fun/ch32v003fun.h

@@ -196,15 +196,127 @@ typedef struct
 } OB_TypeDef;
 
 /* General Purpose I/O */
+typedef enum
+{
+    GPIO_CFGLR_MODE_IN,
+    GPIO_CFGLR_MODE_OUT_10MHz,
+    GPIO_CFGLR_MODE_OUT_2MHz,
+    GPIO_CFGLR_MODE_OUT_50MHz
+} GPIO_MODE_TypeDef;
+typedef enum
+{
+    GPIO_CFGLR_CNF_IN_ANALOG = 0,
+    GPIO_CFGLR_CNF_IN_FLOAT = 1,
+    GPIO_CFGLR_CNF_IN_PULL_UP_DOWN = 2,
+    GPIO_CFGLR_CNF_OUT_PP = 0,
+    GPIO_CFGLR_CNF_OUT_OD = 1,
+    GPIO_CFGLR_CNF_OUT_AF_PP = 2,
+    GPIO_CFGLR_CNF_OUT_AF_OD = 3,
+} GPIO_CNF_TypeDef;
 typedef struct
 {
-    __IO uint32_t CFGLR;
+    __IO union {
+      uint32_t CFGLR;
+      struct CFGLR_t {
+        GPIO_MODE_TypeDef MODE0 :2;
+        GPIO_CNF_TypeDef CNF0 :2;
+        GPIO_MODE_TypeDef MODE1 :2;
+        GPIO_CNF_TypeDef CNF1 :2;
+        GPIO_MODE_TypeDef MODE2 :2;
+        GPIO_CNF_TypeDef CNF2 :2;
+        GPIO_MODE_TypeDef MODE3 :2;
+        GPIO_CNF_TypeDef CNF3 :2;
+        GPIO_MODE_TypeDef MODE4 :2;
+        GPIO_CNF_TypeDef CNF4 :2;
+        GPIO_MODE_TypeDef MODE5 :2;
+        GPIO_CNF_TypeDef CNF5 :2;
+        GPIO_MODE_TypeDef MODE6 :2;
+        GPIO_CNF_TypeDef CNF6 :2;
+        GPIO_MODE_TypeDef MODE7 :2;
+        GPIO_CNF_TypeDef CNF7 :2;
+      } CFGLR_bits;
+    };
     __IO uint32_t CFGHR;
-    __IO uint32_t INDR;
-    __IO uint32_t OUTDR;
-    __IO uint32_t BSHR;
-    __IO uint32_t BCR;
-    __IO uint32_t LCKR;
+    __IO union {
+      uint32_t INDR;
+      struct INDR_t {
+        uint32_t IDR0 :1;
+        uint32_t IDR1 :1;
+        uint32_t IDR2 :1;
+        uint32_t IDR3 :1;
+        uint32_t IDR4 :1;
+        uint32_t IDR5 :1;
+        uint32_t IDR6 :1;
+        uint32_t IDR7 :1;
+        uint32_t :24;
+      } INDR_bits;
+    };
+    __IO union {
+      uint32_t OUTDR;
+      struct OUTDR_t {
+        uint32_t ODR0 :1;
+        uint32_t ODR1 :1;
+        uint32_t ODR2 :1;
+        uint32_t ODR3 :1;
+        uint32_t ODR4 :1;
+        uint32_t ODR5 :1;
+        uint32_t ODR6 :1;
+        uint32_t ODR7 :1;
+        uint32_t :24;
+      } OUTDR_bits;
+    };
+    __IO union {
+      uint32_t BSHR;
+      struct BSHR_t {
+        uint32_t BS0 :1;
+        uint32_t BS1 :1;
+        uint32_t BS2 :1;
+        uint32_t BS3 :1;
+        uint32_t BS4 :1;
+        uint32_t BS5 :1;
+        uint32_t BS6 :1;
+        uint32_t BS7 :1;
+        uint32_t :8;
+        uint32_t BR0 :1;
+        uint32_t BR1 :1;
+        uint32_t BR2 :1;
+        uint32_t BR3 :1;
+        uint32_t BR4 :1;
+        uint32_t BR5 :1;
+        uint32_t BR6 :1;
+        uint32_t BR7 :1;
+        uint32_t :8;
+      } BSHR_bits;
+    };
+    __IO union {
+      uint32_t BCR;
+      struct BCR_t {
+        uint32_t BR0 :1;
+        uint32_t BR1 :1;
+        uint32_t BR2 :1;
+        uint32_t BR3 :1;
+        uint32_t BR4 :1;
+        uint32_t BR5 :1;
+        uint32_t BR6 :1;
+        uint32_t BR7 :1;
+        uint32_t :24;
+      } BCR_bits;
+    };
+    __IO union {
+      uint32_t LCKR;
+      struct LCKR_t {
+        uint32_t LCK0 :1;
+        uint32_t LCK1 :1;
+        uint32_t LCK2 :1;
+        uint32_t LCK3 :1;
+        uint32_t LCK4 :1;
+        uint32_t LCK5 :1;
+        uint32_t LCK6 :1;
+        uint32_t LCK7 :1;
+        uint32_t LCKK :1;
+        uint32_t :23;
+      } LCK_bits;
+    };
 } GPIO_TypeDef;
 
 /* Alternate Function I/O */

examples/struct_gpio/Makefile

+all : flash
+
+TARGET:=debugprintfdemo
+
+include ../../ch32v003fun/ch32v003fun.mk
+
+flash : cv_flash
+clean : cv_clean
+

examples/struct_gpio/debugprintfdemo.c

+/* Small example showing how to use the SWIO programming pin to 
+   do printf through the debug interface */
+
+#define SYSTEM_CORE_CLOCK 48000000
+
+#include "ch32v003fun.h"
+#include <stdio.h>
+
+#define APB_CLOCK SYSTEM_CORE_CLOCK
+
+uint32_t count;
+
+int main()
+{
+	SystemInit48HSI();
+	SetupDebugPrintf();
+
+	// Enable GPIOs
+	RCC->APB2PCENR |= RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC;
+
+    // GPIO D0, D4 Push-Pull
+	GPIOD->CFGLR_bits = (struct CFGLR_t) {
+		.MODE0 = GPIO_CFGLR_MODE_OUT_10MHz,
+		.CNF0 = GPIO_CFGLR_CNF_OUT_PP,
+		.MODE1 = GPIO_CFGLR_MODE_IN,
+		.CNF1 = GPIO_CFGLR_CNF_IN_FLOAT,
+		.MODE4 = GPIO_CFGLR_MODE_OUT_10MHz,
+		.CNF4 = GPIO_CFGLR_CNF_OUT_PP,
+	};
+
+	// GPIO C0 Push-Pull
+	GPIOC->CFGLR_bits = (struct CFGLR_t) {
+		.MODE0 = GPIO_CFGLR_MODE_OUT_10MHz,
+		.CNF0  = GPIO_CFGLR_CNF_OUT_PP,
+	};
+
+	while(1)
+	{
+		// Turn on GPIOs, set in BSHR
+		GPIOD->BSHR_bits = (struct BSHR_t) {
+			.BS0 = 1,
+			.BS4 = 1,
+		};
+		GPIOC->BSHR_bits.BS0 = 1;
+		printf( "+%lu\n", count++ );
+		Delay_Ms( 100 );
+
+		// Turn off GPIODs, clear in BSHR
+		GPIOD->BSHR_bits = (struct BSHR_t) {
+			.BR0 = 1,
+			.BR4 = 1,
+		};
+		// or clear in BCR
+		GPIOC->BCR_bits.BR0 = 1;
+		printf( "-%lu\n", count++ );
+		Delay_Ms( 100 );
+	}
+}
+