From e16e34ade091144863175f42dc23299e36e16b74 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Ma=C5=A1karinec?= <marek@mrms.cz>
Date: Mon, 29 May 2023 22:11:15 +0200
Subject: [PATCH] examples: add independant watchdog example
---
examples/iwdg/Makefile | 10 +++++++
examples/iwdg/iwdg.c | 60 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+)
create mode 100644 examples/iwdg/Makefile
create mode 100644 examples/iwdg/iwdg.c
diff --git a/examples/iwdg/Makefile b/examples/iwdg/Makefile
new file mode 100644
index 0000000..0d17f3d
--- /dev/null
+++ b/examples/iwdg/Makefile
@@ -0,0 +1,10 @@
+all : flash
+
+TARGET:=iwdg
+
+include ../../ch32v003fun/ch32v003fun.mk
+
+flash : cv_flash
+clean : cv_clean
+
+
diff --git a/examples/iwdg/iwdg.c b/examples/iwdg/iwdg.c
new file mode 100644
index 0000000..65d872f
--- /dev/null
+++ b/examples/iwdg/iwdg.c
@@ -0,0 +1,60 @@
+// Could be defined here, or in the processor defines.
+#define SYSTEM_CORE_CLOCK 48000000
+
+#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;
+
+ IWDG->CTLR = 0x5555;
+ IWDG->RLDR = reload_val & 0xfff;
+
+ IWDG->CTLR = 0xCCCC;
+}
+
+static void iwdg_feed() {
+ IWDG->CTLR = 0xAAAA;
+}
+
+int main()
+{
+ SystemInit48HSI();
+
+ // Enable GPIOs
+ RCC->APB2PCENR |= RCC_APB2Periph_GPIOC;
+
+ // GPIO C0 Push-Pull
+ GPIOC->CFGLR &= ~(0xf<<(4*0));
+ GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*0);
+
+ GPIOC->BSHR = 1;
+ Delay_Ms( 1500 );
+ GPIOC->BSHR = (1<<16);
+ Delay_Ms( 1000 );
+
+ // set up watchdog to about 4 s
+ iwdg_setup(0xfff, IWDG_Prescaler_128);
+
+ GPIOC->BSHR = 1;
+ Delay_Ms( 3000 );
+ GPIOC->BSHR = (1<<16);
+
+ // feed the watch dog. Now there should be about 8 blinks
+ iwdg_feed();
+
+ while(1)
+ {
+ GPIOC->BSHR = 1;
+ Delay_Ms( 250 );
+ GPIOC->BSHR = (1<<16);
+ Delay_Ms( 250 );
+ count++;
+ }
+}
+
--
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