timer0.c

ATMEGA128的定时器的底层驱动程序,包括C和H文件,定义了充分的宏方便使用

/**********************************************************************
* System Name		DOOR
* Source Name		timer0.c
* Function			定时器0
* Version	Date		Editor		Modification
* 1.0		2007/05/09	周斌		做成
**********************************************************************/

#include <avr/io.h>
#include <avr/interrupt.h>
#include "global.h"
#include "timer0.h"
#include "uart0.h"
#include "uart2.h"


//定时器初始值列表
#define TCNT0_14M_1MS 0xC6
#define TCNT0_14M_2MS 0x8D
#define TCNT0_14M_3MS 0x53
#define TCNT0_14M_4MS 0x1A




/**********************************************************************
* Function Name		led_init
* Function Desc		timer0初始化函数
* Return Value		无
* Parameter         无
* Version	Date		Editor		Modification
* 1.0		2007/05/09	周斌		做成
**********************************************************************/
void timer0_init(UCHAR t_time)
{
	TCCR0  = 0x00;//停止定时器
	switch(t_time)
	{
		case TIMER0_1MS:
			TCNT0  = TCNT0_14M_1MS;//初始值
			break;
		case TIMER0_2MS:
			TCNT0  = TCNT0_14M_2MS;//初始值
			break;
		case TIMER0_3MS:
			TCNT0  = TCNT0_14M_3MS;//初始值
			break;
		case TIMER0_4MS:
			TCNT0  = TCNT0_14M_4MS;//初始值
			break;
		default:
			TCNT0  = TCNT0_14M_1MS;//初始值
			break;
	}			
	OCR0   = 0x19;//匹配值
	TIMSK |= 0x01;//中断允许
	TCCR0  = 0x03;//启动定时器
}



/**********************************************************************
* Function Name		SIGNAL(SIG_OVERFLOW0)
* Function Desc		timer0溢出中断
* Return Value		无
* Parameter         无
* Version	Date		Editor		Modification
* 1.0		2007/05/15	周斌		做成
**********************************************************************/
SIGNAL(SIG_OVERFLOW0)
{
	static UCHAR timer0_task_action_counter = 0;	
	static UCHAR timer0_task_led1_counter = 0;
	static UCHAR timer0_task_rfid_counter = 0;
	static UCHAR timer0_task_uart0pack_counter = 0;
	static UCHAR timer0_task_uart2pack_counter = 0;
	//
	TCNT0 = TCNT0_14M_1MS;	//RELOAD TIMER0
	//TIMER0 TASK ACTION - 10ms
	timer0_task_action_counter++;
	if(timer0_task_action_counter >= 10)
	{
		timer0_task_action_stat = TIMER0_TASK_ACTION_READY;
	}
	//TIMER0 TASK LED1 - 250ms
	timer0_task_led1_counter++;
	if(timer0_task_led1_counter >= 250)
	{
		timer0_task_led1_stat = TIMER0_TASK_LED1_READY;
		timer0_task_led1_counter=0;
	}
	//TIMER0 TASK RFID - 50ms
	timer0_task_rfid_counter++;
	if(timer0_task_rfid_counter >= 50)
	{
		timer0_task_rfid_stat = TIMER0_TASK_RFID_READY;
		timer0_task_rfid_counter=0;
	}
	//TIMER0 TASK UART0PACK - 2ms	,按照时间清除残缺的包
	timer0_task_uart0pack_counter++;
	if(timer0_task_uart0pack_counter >= 200)
	{
		if(timer0_task_uart0pack_stat == TIMER0_TASK_UART0PACK_NEW)
		{
			timer0_task_uart0pack_stat = TIMER0_TASK_UART0PACK_OLD;
		}
		else if(timer0_task_uart0pack_stat == TIMER0_TASK_UART0PACK_OLD)
		{
			timer0_task_uart0pack_stat = TIMER0_TASK_UART0PACK_BAD;
		}
		else if(timer0_task_uart0pack_stat == TIMER0_TASK_UART0PACK_BAD)
		{
			//uart0_clear_buffer();
		}
		timer0_task_uart0pack_counter = 0;
	}
	//TIMER0 TASK UART2PACK - 2ms	,按照时间清除残缺的包
	timer0_task_uart2pack_counter++;
	if(timer0_task_uart2pack_counter >= 200)
	{
		if(timer0_task_uart2pack_stat == TIMER0_TASK_UART2PACK_NEW)
		{
			timer0_task_uart2pack_stat = TIMER0_TASK_UART2PACK_OLD;
		}
		else if(timer0_task_uart2pack_stat == TIMER0_TASK_UART2PACK_OLD)
		{
			timer0_task_uart2pack_stat = TIMER0_TASK_UART2PACK_BAD;
		}
		else if(timer0_task_uart2pack_stat == TIMER0_TASK_UART2PACK_BAD)
		{
			//uart2_clear_buffer();
		}
		timer0_task_uart2pack_counter = 0;
	}

	//TIMER0 TASK UART1TIMEOUT - 2ms	,如果时间超时，重新发送数据包
	timer0_task_uart1timeout_stat++;
	if(timer0_task_uart1timeout_stat >= 100)
	{
		if(timer0_task_uart1timeout_stat == TIMER0_TASK_UART0TIMEOUT_WAIT)
		{
			timer0_task_uart1timeout_stat = TIMER0_TASK_UART0TIMEOUT_TIMEOUT;
		}
		else if(timer0_task_uart1timeout_stat == TIMER0_TASK_UART0TIMEOUT_TIMEOUT)
		{
			timer0_task_uart1timeout_stat = TIMER0_TASK_UART0TIMEOUT_READY;
		}
		timer0_task_uart1timeout_stat = 0;
	}
}