/**************************************************************************//**
* [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 Timer 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 */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint32_t g_au32TMRINTCount[4] = {0};
/*---------------------------------------------------------------------------------------------------------*/
/* Create Counter Source by GPIO PORT2 */
/*---------------------------------------------------------------------------------------------------------*/
void GeneratePORT2Counter(uint32_t u32Pin, uint32_t u32Counts)
{
while(u32Counts--)
{
GPIO_PIN_ADDR(2, u32Pin) = 1;
GPIO_PIN_ADDR(2, u32Pin) = 0;
}
}
/**
* @brief Timer1 IRQ
*
* @param None
*
* [url=home.php?mod=space&uid=266161]@return[/url] None
*
* [url=home.php?mod=space&uid=1543424]@Details[/url] The Timer1 default IRQ, declared in startup_M051Series.s.
*/
void TMR1_IRQHandler(void)
{
if(TIMER_GetIntFlag(TIMER1) == 1)
{
/* Clear Timer1 time-out interrupt flag */
TIMER_ClearIntFlag(TIMER1);
g_au32TMRINTCount[1]++;
}
}
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 */
CLK->PWRCON |= CLK_PWRCON_XTL12M_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);
/* 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_TMR1_EN_Msk;
/* Peripheral clock source */
CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL | CLK_CLKSEL1_TMR1_S_HCLK;
/* 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 and T1 */
SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P35_T1;
}
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)
{
volatile uint32_t u32InitCount;
/* 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();
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
printf("+-------------------------------------------------+\n");
printf("| Timer1 External Counter Input Sample Code |\n");
printf("+-------------------------------------------------+\n\n");
printf("# Timer Settings:\n");
printf(" Timer1: Clock source is HCLK(50 MHz); Continuous counting mode; Interrupt enable;\n");
printf(" External counter input enable; TCMP is 56789.\n");
printf("# Connect P2.0 to T1 pin and pull P2.0 High/Low as T1 counter input source.\n\n");
/* Configure P2.0 as GPIO output pin and pull pin status to Low first */
GPIO_SetMode(P2, 0, GPIO_PMD_OUTPUT);
P20 = 0;
/* Initial Timer1 default setting */
TIMER_Open(TIMER1, TIMER_CONTINUOUS_MODE, 1);
/* Configure Timer1 setting for external counter input function */
TIMER_SELECT_TOUT_PIN(TIMER1, TIMER_TOUT_PIN_FROM_TX_PIN);
TIMER_SET_PRESCALE_VALUE(TIMER1, 0);
TIMER_SET_CMP_VALUE(TIMER1, 56789);
TIMER_EnableEventCounter(TIMER1, TIMER_COUNTER_FALLING_EDGE);
TIMER_EnableInt(TIMER1);
/* Enable Timer1 NVIC */
NVIC_EnableIRQ(TMR1_IRQn);
/* Clear Timer1 interrupt counts to 0 */
g_au32TMRINTCount[1] = 0;
/* Start Timer1 counting */
TIMER_Start(TIMER1);
/* To check if TDR of Timer1 must be 0 as default value */
if(TIMER_GetCounter(TIMER1) != 0)
{
printf("Default counter value is not 0. (%d)\n", TIMER_GetCounter(TIMER1));
/* Stop Timer1 counting */
TIMER_Close(TIMER1);
while(1);
}
/* To generate one counter event to T1 pin */
GeneratePORT2Counter(0, 1);
/* To check if TDR of Timer1 must be 1 */
while(TIMER_GetCounter(TIMER1) == 0);
if(TIMER_GetCounter(TIMER1) != 1)
{
printf("Get unexpected counter value. (%d)\n", TIMER_GetCounter(TIMER1));
/* Stop Timer1 counting */
TIMER_Close(TIMER1);
while(1);
}
/* To generate remains counts to T1 pin */
GeneratePORT2Counter(0, (56789 - 1));
while(1)
{
if((g_au32TMRINTCount[1] == 1) && (TIMER_GetCounter(TIMER1) == 56789))
{
printf("Timer1 external counter input function ... PASS.\n");
break;
}
}
/* Stop Timer1 counting */
TIMER_Close(TIMER1);
while(1);
}
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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