USB_HUB_UART/APP/HARDWARE/sources/iwdg.c

#include "iwdg.h"
#include "stm32f2xx_iwdg.h"

void IWDG_Configuration(uint16_t ms)
{
	/* Enable write access to IWDG_PR and IWDG_RLR registers */
    IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
		//Prescaler_4  Min timeout:0.125ms  Max timeout :512
		//Prescaler_8  Min timeout:0.25ms  Max timeout :1024
		//Prescaler_16  Min timeout:0.5ms  Max timeout :2048
		//Prescaler_32  Min timeout:1ms  Max timeout :4096
		//Prescaler_64  Min timeout:2ms  Max timeout :8192
		//Prescaler_128  Min timeout:4ms  Max timeout :16384
		//Prescaler_256  Min timeout:8ms  Max timeout :32768
		IWDG_SetPrescaler(IWDG_Prescaler_64);
		/* Set counter reload value to obtain 1000ms IWDG TimeOut.
		Counter Reload Value = 1000ms/IWDG counter clock period
		= 1000ms / (LSI/64)
		= 1s / (32 KHz /64)
		= 2
		*/
		IWDG_SetReload(ms/2); // ms
		/* Enable IWDG (LSI oscillator will be enabled by hardware) */
		IWDG_Enable();
		/* Reload IWDG counter */
		IWDG_ReloadCounter();
		
}
 
void IWDG_feed()
{
	/* Reload IWDG counter */
	IWDG_ReloadCounter(); 
}