Ch32v303 lowpower standby mode

examples_v30x/lowpower_standbyMode_test/Makefile

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+all : flash
+
+TARGET:=lowpower_standbyMode_test
+TARGET_MCU:=CH32V303
+TARGET_MCU_PACKAGE:=CH32V303
+
+include ../../ch32fun/ch32fun.mk
+
+flash : cv_flash
+clean : cv_clean
+
+

examples_v30x/lowpower_standbyMode_test/funconfig.h

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+#ifndef _FUNCONFIG_H
+#define _FUNCONFIG_H
+
+#define FUNCONF_SYSTICK_USE_HCLK 1
+#define FUNCONF_USE_HSI 1
+#define FUNCONF_USE_PLL 0
+#define FUNCONF_PLL_MULTIPLIER 2
+
+#define FUNCONF_USE_DEBUGPRINTF 1
+#define FUNCONF_SYSTEM_CORE_CLOCK 8 * 1000 * 1000 
+
+#endif
+

examples_v30x/lowpower_standbyMode_test/lowpower_standbyMode_test.c

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+// Simple example showing how to use the low power standby mode
+// The current consumption while sleep is around 2uA
+
+// Setup:
+// PB10 - LED indicator
+
+// Program behavior:
+// 1. 5 second delay to allow reprogramming
+// 2. Set all GPIOs to input pull up
+// 3. Enter standby
+// 4. Wake up using the IWDG timer (after 5 seconds), the indicator Led will blink upon wakeup
+// 5. Go back to sleep and repeat
+
+#include "ch32fun.h"
+#include <stdio.h>
+
+#define LED_PIN PB10
+
+void blink_led(int time) {
+	for (int i = 0; i < time; i++) {
+		funDigitalWrite(LED_PIN, 1);
+		Delay_Ms( 50 );
+		funDigitalWrite(LED_PIN, 0);
+		Delay_Ms( 50 );
+	}
+}
+
+void IWDG_init(u16 prescaler, u16 reload) {
+	// 1. Enable access to IWDG registers
+	IWDG->CTLR = IWDG_WriteAccess_Enable;
+
+	// 2. Set prescaler and reload value
+	IWDG->PSCR = prescaler;
+	IWDG->RLDR = reload;
+
+	// 3. Enable IWDG (cannot be disabled after this!)
+	IWDG->CTLR = CTLR_KEY_Reload;
+	IWDG->CTLR = CTLR_KEY_Enable;
+
+	// 4. wait for LSI ready
+	while(!(RCC->RSTSCKR & RCC_LSIRDY));
+}
+
+int main() {
+	SystemInit();
+	Delay_Ms(100);
+	funGpioInitAll();
+
+	printf("\n~ Low Power Stop Mode Test ~\n");
+	funPinMode(LED_PIN, GPIO_CFGLR_OUT_10Mhz_PP);
+	blink_led(1);
+
+	//! WARNING: need 5 seconds to allow reprogramming on power up
+	//! DONT set GPIOA->CFGHR to pullup before the 5 seconds delay because they are used for SWCLK and SWDIO
+	// if you want to get around this 5s delay you can configure a GPIO input and check it to determine
+	// if it's in bypass mode so you can reprogram it
+	Delay_Ms(4000);
+
+	// Set all GPIOs to input pull up to reduce power consumption
+	GPIOA->CFGLR = 0x88888888;
+	GPIOB->CFGLR = 0x88888888;
+	GPIOC->CFGLR = 0x88888888;
+	GPIOD->CFGLR = 0x88888888;
+	GPIOE->CFGLR = 0x88888888;
+
+	GPIOA->CFGHR = 0x88888888;
+	GPIOB->CFGHR = 0x88888888;
+	GPIOC->CFGHR = 0x88888888;
+	GPIOD->CFGHR = 0x88888888;
+	GPIOE->CFGHR = 0x88888888;
+
+	// Enable PWR clock
+	RCC->APB1PCENR |= RCC_APB1Periph_PWR;
+
+	// Enter standby mode	
+	PWR->CTLR |= PWR_CTLR_PDDS;
+	NVIC->SCTLR |= (1 << 2);
+
+	// reload value for 5 second timeout = (5 * 40KHz / 128) - 1 = 1561
+	IWDG_init(IWDG_Prescaler_128, 1561);
+	__WFI();
+
+	while(1);
+}