/**************************************************************************//**
* @file main.c
* @version V1.00
* $Date: 19/06/17 3:56p $
* @brief MINI51 DS18B20 Driver Sample Code
*
* @note
* Copyright (C) 2019 Nuvoton Technology Corp. All rights reserved.
*
*****************************************************************************/
#include <stdio.h>
#include "mini51series.h"
int16_t DS18B20_ReadTemperature(void);
void SYS_Init(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable external 12MHz XTAL, internal 22.1184MHz */
CLK->PWRCON |= CLK_PWRCON_XTL12M | CLK_PWRCON_IRC22M_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);
/* To update the variable SystemCoreClock */
SystemCoreClockUpdate();
/* Lock protected registers */
SYS_LockReg();
}
void UART_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset IP */
SYS_ResetModule(SYS_IPRSTC2_UART_RST_Msk);
/* Configure UART and set UART Baudrate */
UART_Open(UART, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
float t;
/* Init System, IP clock and multi-function I/O */
SYS_Init(); //In the end of SYS_Init() will issue SYS_LockReg() to lock protected register. If user want to write protected register, please issue SYS_UnlockReg() to unlock protected register.
/* Init UART for printf */
UART_Init();
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %dHz\n", SystemCoreClock);
printf("+-------------------------------------+ \n");
printf("| DS18B20 Sample Code | \n");
printf("+-------------------------------------+ \n");
/* Configure P5.2 as Quasi mode */
GPIO_SetMode(P5, BIT2, GPIO_PMD_QUASI);
while (1)
{
t = DS18B20_ReadTemperature() * 0.0625;
printf("\n%f\n", t);
CLK_SysTickDelay(1000000);//delay 1 sec
}
}
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