/******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V2.00
* $Date: 15/10/06 1:21p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate how to get PDID, get and clear reset source, configure
* BOD, and output system clock to CKO pin with the system
* clock / 4 frequency
*
* @note
* Copyright (C) 2012 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "Mini51Series.h"
#define SIGNATURE 0x125ab234
#define FLAG_ADDR 0x200007FC
extern char GetChar(void);
/*---------------------------------------------------------------------------------------------------------*/
/* Brown Out Detector IRQ Handler */
/*---------------------------------------------------------------------------------------------------------*/
void BOD_IRQHandler(void)
{
/* Clear Interrupt Flag */
SYS->BODCTL |= SYS_BODCR_BOD_INTF_Msk;
printf("Brown Out is Detected\n");
}
/*---------------------------------------------------------------------------------------------------------*/
/* Power Down Wake Up IRQ Handler */
/*---------------------------------------------------------------------------------------------------------*/
void PWRWU_IRQHandler(void)
{
/* Clear Power Down Wake Up interrupt flag */
CLK->PWRCON |= CLK_PWRCON_PD_WU_STS_Msk;
printf("Wake Up Interrupt is asserted\n");
}
void SYS_Init(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P5 multi-function pins for XTAL1 and XTAL2 */
SYS->P5_MFP &= ~(SYS_MFP_P50_Msk | SYS_MFP_P51_Msk);
SYS->P5_MFP |= (SYS_MFP_P50_XTAL1 | SYS_MFP_P51_XTAL2);
/* Enable external 12MHz XTAL, internal 22.1184MHz */
CLK_EnableXtalRC(CLK_PWRCON_HXT|CLK_PWRCON_HIRC_EN_Msk);
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL_STB_Msk | CLK_CLKSTATUS_IRC22M_STB_Msk);
/* Switch HCLK clock source to XTL */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_XTAL,CLK_CLKDIV_HCLK(1));
/* STCLK to XTL STCLK to XTL */
CLK_SetSysTickClockSrc(CLK_CLKSEL0_STCLK_S_XTAL);
/* Enable IP clock */
CLK_EnableModuleClock(UART_MODULE);
/* Select IP clock source */
CLK_SetModuleClock(UART_MODULE,CLK_CLKSEL1_UART_S_XTAL,CLK_CLKDIV_UART(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P0 multi-function pins for UART RXD and TXD */
SYS->P0_MFP &= ~(SYS_MFP_P01_Msk | SYS_MFP_P00_Msk);
SYS->P0_MFP |= (SYS_MFP_P01_RXD | SYS_MFP_P00_TXD);
/* Set P3 multi-function pins for Clock Output */
SYS->P3_MFP = SYS_MFP_P36_CKO;
/* To update the variable SystemCoreClock */
SystemCoreClockUpdate();
/* Lock protected registers */
SYS_LockReg();
}
void UART_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset IP */
SYS_ResetModule(UART_RST);
/* Configure UART and set UART Baudrate */
UART_Open(UART, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* Main Function */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main (void)
{
uint32_t u32data;
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Init UART for printf */
UART_Init();
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %dHz\n", SystemCoreClock);
/*
This sample code will show some function about system manager controller and clock controller:
1. Read PDID
2. Get and clear reset source
3. Setting about BOD
4. Output system clock from CKO pin, and the output frequency = system clock / 4
*/
printf("+----------------------------------------+\n");
printf("| Mini51 System Driver Sample Code |\n");
printf("+----------------------------------------+\n");
if (M32(FLAG_ADDR) == SIGNATURE) {
printf(" CPU Reset success!\n");
M32(FLAG_ADDR) = 0;
printf(" Press any key to continue ...\n");
GetChar();
}
/*---------------------------------------------------------------------------------------------------------*/
/* Misc system function test */
/*---------------------------------------------------------------------------------------------------------*/
/* Read Part Device ID */
printf("Product ID 0x%x\n", SYS->PDID);
/* Get reset source from last operation */
u32data = SYS_GetResetSrc();
printf("Reset Source 0x%x\n", u32data);
/* Clear reset source */
SYS_ClearResetSrc(u32data);
/* Unlock protected registers for Brown-Out Detector settings */
SYS_UnlockReg();
/* Check if the write-protected registers are unlocked before BOD setting and CPU Reset */
if (SYS->RegLockAddr != 0) {
printf("Protected Address is Unlocked\n");
}
/* Enable Brown-Out Detector and Low Voltage Reset function, and set Brown-Out Detector voltage 2.7V ,
Enable Brown-Out Interrupt function */
SYS_EnableBOD(SYS_BODCR_BOD_INTERRUPT_EN,SYS_BODCR_BOD_VL_2_7V);
/* Enable BOD IRQ */
NVIC_EnableIRQ(BOD_IRQn);
/* Write a signature work to SRAM to check if it is reset by software */
M32(FLAG_ADDR) = SIGNATURE;
printf("\n\n >>> Reset CPU <<<\n");
/* Waiting for message send out */
UART_WAIT_TX_EMPTY(UART);
/* Switch HCLK clock source to Internal 22MHz */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_IRC22M,0);
/* Enable CKO and output frequency = system clock / 4 */
CLK_EnableCKO(CLK_CLKSEL2_FRQDIV_HCLK,1,0);
/* Reset CPU */
SYS_ResetCPU();
}
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