- /**************************************************************************//**
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V3.00
- * $Revision: 3 $
- * $Date: 14/01/28 11:45a $
- * [url=home.php?mod=space&uid=247401]@brief[/url] M051 Series WDT Driver Sample Code
- *
- * @note
- * Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
- ******************************************************************************/
- #include <stdio.h>
- #include "M051Series.h"
- #define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
- #define PLL_CLOCK 50000000
- /*---------------------------------------------------------------------------------------------------------*/
- /* Global Interface Variables Declarations */
- /*---------------------------------------------------------------------------------------------------------*/
- extern int IsDebugFifoEmpty(void);
- volatile uint8_t g_u8IsWDTTimeoutINT = 0;
- /**
- * @brief IRQ Handler for WDT and WWDT Interrupt
- *
- * @param None
- *
- * [url=home.php?mod=space&uid=266161]@return[/url] None
- *
- * [url=home.php?mod=space&uid=1543424]@Details[/url] The WDT_IRQHandler is default IRQ of WDT and WWDT, declared in startup_M051Series.s.
- */
- void WDT_IRQHandler(void)
- {
- if(WDT_GET_TIMEOUT_INT_FLAG() == 1)
- {
- /* Clear WDT time-out interrupt flag */
- WDT_CLEAR_TIMEOUT_INT_FLAG();
- g_u8IsWDTTimeoutINT = 1;
- printf("WDT time-out interrupt occurred.\n");
- }
- }
- void SYS_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init System Clock */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Enable IRC22M clock */
- CLK->PWRCON |= CLK_PWRCON_IRC22M_EN_Msk;
- /* Waiting for IRC22M clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_IRC22M_STB_Msk);
- /* Switch HCLK clock source to HIRC */
- CLK->CLKSEL0 = CLK_CLKSEL0_HCLK_S_HIRC;
- /* Set PLL to Power-down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/
- CLK->PLLCON |= CLK_PLLCON_PD_Msk;
- /* Enable external 12 MHz XTAL, IRC 10 kHz */
- CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC10K_EN_Msk;
- /* Enable PLL and Set PLL frequency */
- CLK->PLLCON = PLLCON_SETTING;
- /* Waiting for clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_IRC10K_STB_Msk);
- /* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
- CLK->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;
- /* Enable peripheral clock */
- CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk | CLK_APBCLK_WDT_EN_Msk;
- /* Peripheral clock source */
- CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL | CLK_CLKSEL1_WDT_S_LIRC;
- /* Update System Core Clock */
- /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
- SystemCoreClockUpdate();
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set P3 multi-function pins for UART0 RXD, TXD */
- SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;
- }
- void UART0_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init UART */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Reset IP */
- SYS_ResetModule(UART0_RST);
- /* Configure UART0 and set UART0 Baudrate */
- UART_Open(UART0, 115200);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* MAIN function */
- /*---------------------------------------------------------------------------------------------------------*/
- int main(void)
- {
- /* Unlock protected registers */
- SYS_UnlockReg();
- /* Init System, peripheral clock and multi-function I/O */
- SYS_Init();
- /* Lock protected registers */
- SYS_LockReg();
- /* Init UART0 for printf */
- UART0_Init();
- if(WDT_GET_RESET_FLAG() == 1)
- {
- /* Use P0.0 to check time-out period time */
- GPIO_SetMode(P0, 0, GPIO_PMD_OUTPUT);
- P00 = 1;
- P00 = 0;
- WDT_CLEAR_RESET_FLAG();
- printf("\n*** WDT time-out reset occurred ***\n");
- while(1);
- }
- printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
- printf("+--------------------------------------+\n");
- printf("| WDT Time-out Reset Sample Code |\n");
- printf("+--------------------------------------+\n\n");
- printf("# WDT Settings:\n");
- printf(" Clock source is 10 kHz; Enable interrupt; Time-out interval is 2^14 * WDT clock.\n");
- printf("# When WDT start counting, system will generate a WDT time-out interrupt after 1.6384 ~ 1.7408 s.\n");
- printf(" Measure P0.0 low period to check time-out interval and do not reload WDT counter.\n\n");
- /* Use P0.0 to check time-out period time */
- GPIO_SetMode(P0, 0, GPIO_PMD_OUTPUT);
- P00 = 1;
- P00 = 0;
- /* Because of all bits can be written in WDT Control Register are write-protected;
- To program it needs to disable register protection first. */
- SYS_UnlockReg();
- /* Enable WDT time-out reset function and select time-out interval to 2^14 * WDT clock then start WDT counting */
- g_u8IsWDTTimeoutINT = 0;
- WDT_Open(WDT_TIMEOUT_2POW14, WDT_RESET_DELAY_1026CLK, TRUE, FALSE);
- /* Enable WDT interrupt function */
- WDT_EnableInt();
- /* Enable WDT NVIC */
- NVIC_EnableIRQ(WDT_IRQn);
- /* Check if WDT time-out interrupt occurred */
- while(g_u8IsWDTTimeoutINT == 0);
- P00 = 1;
- while(1);
- }
- /*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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