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如果想使用看门狗作为一个定时器,而不让看门狗定时器复位咋办
/*---------------------------------------------------------------------------------------------------------*/ /* */ /* Copyright(c) 2016 Nuvoton Technology Corp. All rights reserved. */ /* */ /*---------------------------------------------------------------------------------------------------------*/ //*********************************************************************************************************** // Nuvoton Technoledge Corp. // Website: http://www.nuvoton.com // E-Mail : MicroC-8bit@nuvoton.com // Date : Apr/21/2016 //*********************************************************************************************************** //*********************************************************************************************************** // File Function: N76E003 Watch Dog reste functiondemo code //*********************************************************************************************************** #include "N76E003.h" #include "Common.h" #include "Delay.h" #include "SFR_Macro.h" #include "Function_define.h" #define CFG_READ 0xC0 #define CFG_ERASE 0xE2 #define CFG_BYTE_PROGRAM 0xE1 /*********************************************************************** WDT CONFIG enable warning : this macro is only when ICP not enable CONFIG WDT function copy this marco code to you code to enable WDT reset. ************************************************************************/ void Enable_WDT_Reset_Config(void) { set_IAPEN; IAPAL = 0x04; IAPAH = 0x00; IAPFD = 0x0F; IAPCN = CFG_BYTE_PROGRAM; set_CFUEN; set_IAPGO; //trigger IAP while((CHPCON&SET_BIT6)==SET_BIT6); //check IAPFF (CHPCON.6) clr_CFUEN; clr_IAPEN; } /*********************************************************************** WDT CONFIG disable warning : this macro is for CONFIG already enable WDT Reset to disable. Since erase CONFIG is full page step 1. storage CONFIG value in RAM step 2. modify RAM CONFIG4 WDT value to disable step 3. erase CONFIG page step 4. re writer CONFIG. ************************************************************************/ void Disable_WDT_Reset_Config(void) { UINT8 cf0,cf1,cf2,cf3,cf4; set_IAPEN; IAPAL = 0x00; IAPAH = 0x00; IAPCN = CFG_READ; set_IAPGO; //Storage CONFIG0 data cf0 = IAPFD; IAPAL = 0x01; set_IAPGO; //Storage CONFIG1 data cf1 = IAPFD; IAPAL = 0x02; set_IAPGO; //Storage CONFIG2 data cf2 = IAPFD; IAPAL = 0x03; set_IAPGO; //Storage CONFIG3 data cf3 = IAPFD; IAPAL = 0x04; set_IAPGO; //Storage CONFIG4 data cf4 = IAPFD; cf4 |= 0xF0; //Moidfy Storage CONFIG4 data disable WDT reset set_CFUEN; IAPCN = CFG_ERASE; //Erase CONFIG all IAPAH = 0x00; IAPAL = 0x00; IAPFD = 0xFF; set_IAPGO; IAPCN = CFG_BYTE_PROGRAM; //Write CONFIG IAPFD = cf0; set_IAPGO; IAPAL = 0x01; IAPFD = cf1; set_IAPGO; IAPAL = 0x02; IAPFD = cf2; set_IAPGO; IAPAL = 0x03; IAPFD = cf3; set_IAPGO; IAPAL = 0x04; IAPFD = cf4; set_IAPGO; clr_CFUEN; clr_IAPEN; } /************************************************************************************************************ * Main function ************************************************************************************************************/ void main (void) { Set_All_GPIO_Quasi_Mode; clr_GPIO1; Timer0_Delay1ms(50); //toggle I/O to show MCU Reset set_GPIO1; Timer0_Delay1ms(50); clr_GPIO1; Timer0_Delay1ms(50); set_GPIO1; Timer0_Delay1ms(50); //---------------------------------------------------------------------------------------------- // WDT Init !!! ENABLE CONFIG WDT FIRST !!! // Warning: // Always check CONFIG WDT enable first, CONFIG not enable, SFR can't enable WDT reset // Please call Enable_WDT_Reset_Config() function to enable CONFIG WDT reset //---------------------------------------------------------------------------------------------- // Enable_WDT_Reset_Config(); //Software enable WDT reset CONFIG setting TA=0xAA;TA=0x55;WDCON|=0x07; //Setting WDT prescale set_WDCLR; //Clear WDT timer while((WDCON|~SET_BIT6)==0xFF); //confirm WDT clear is ok before into power down mode // EA = 1; set_WDTR; //WDT run Disable_WDT_Reset_Config(); //Software disable WDT reset CONFIG setting while (1) { clr_GPIO1; Timer0_Delay1ms(100); set_GPIO1; Timer0_Delay1ms(100); clr_GPIO1; Timer0_Delay1ms(100); set_GPIO1; Timer0_Delay1ms(100); clr_GPIO1; set_PD; } } |
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如果想使用看门狗作为一个定时器,而不让看门狗定时器复位,需要在程序中定期喂狗(向看门狗发送喂狗信号),这样看门狗就不会进行复位操作。具体实现方法可以参考所使用的硬件平台的手册或者资料。
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