examples: blink D0 and D4 in iwdg example

examples/iwdg/iwdg.c

@@ -4,10 +4,6 @@
 #include "ch32v003fun.h"
 #include <stdio.h>
 
-#define APB_CLOCK SYSTEM_CORE_CLOCK
-
-uint32_t count;
-
 static void iwdg_setup(uint16_t reload_val, uint8_t prescaler) {
 	IWDG->CTLR = 0x5555;
 	IWDG->PSCR = prescaler;
@@ -22,39 +18,56 @@ static void iwdg_feed() {
 	IWDG->CTLR = 0xAAAA;
 }
 
+static void gpios_on() {
+	GPIOD->BSHR = 1 | (1<<4);
+	GPIOC->BSHR = 1;
+}
+
+static void gpios_off() {
+	GPIOD->BSHR = (1<<16) | (1<<(16+4));
+	GPIOC->BSHR = (1<<16);
+}
+
 int main()
 {
 	SystemInit48HSI();
 
 	// Enable GPIOs
-	RCC->APB2PCENR |= RCC_APB2Periph_GPIOC;
+	RCC->APB2PCENR |= RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC;
+
+	// GPIO D0 Push-Pull
+	GPIOD->CFGLR &= ~(0xf<<(4*0));
+	GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*0);
+
+	// GPIO D4 Push-Pull
+	GPIOD->CFGLR &= ~(0xf<<(4*4));
+	GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*4);
 
 	// GPIO C0 Push-Pull
 	GPIOC->CFGLR &= ~(0xf<<(4*0));
 	GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*0);
 
-	GPIOC->BSHR = 1;
+	gpios_on();
 	Delay_Ms( 1500 );
-	GPIOC->BSHR = (1<<16);
+	gpios_off();
 	Delay_Ms( 1000 );
 
 	// set up watchdog to about 4 s
 	iwdg_setup(0xfff, IWDG_Prescaler_128);
 
-	GPIOC->BSHR = 1;
+	gpios_on();
 	Delay_Ms( 3000 );
-	GPIOC->BSHR = (1<<16);
+	gpios_off();
 
 	// feed the watch dog. Now there should be about 8 blinks
 	iwdg_feed();
 
 	while(1)
 	{
-		GPIOC->BSHR = 1;
+		gpios_on();
 		Delay_Ms( 250 );
-		GPIOC->BSHR = (1<<16);
+		gpios_off();
 		Delay_Ms( 250 );
-		count++;
 	}
 }