?? bsp.c
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/*
*********************************************************************************************************
* Atmel ATmega128
* Board Support Package
*
* (c) Copyright 2005, Micrium, Weston, FL
* All Rights Reserved
*
*
* File : BSP.C
* By : Jean J. Labrosse
*********************************************************************************************************
*/
#include <includes.h>
/*
*********************************************************************************************************
* PROTOTYPES
*********************************************************************************************************
*/
static void BSP_InitTickISR(void);
static void LED_Init(void);
/*
*********************************************************************************************************
* BSP INITIALIZATION
*
* Description : This function should be called by your application code before you make use of any of the
* functions found in this module.
*
* Arguments : none
*********************************************************************************************************
*/
void BSP_Init (void)
{
LED_Init();
BSP_InitTickISR();
}
/*
*********************************************************************************************************
* SETUP THE TICK RATE
*
* Note(s): 1) OCR0 = CPU_CLK_FREQ / (2 * Prescaler * OC_freq) - 1
* 2) The equation actually performs rounding by multiplying by 2, adding 1 and then divising by 2
* in integer math, this is equivalent to adding 0.5
*********************************************************************************************************
*/
static void BSP_InitTickISR (void)
{
INT32U num;
INT32U denom;
TCCR0 = 0x0E; /* Set TIMER0 prescaler to CTC Mode, CLK/256 */
TCNT0 = 0; /* Start TCNT at 0 for a new cycle */
num = (INT32U)CPU_CLK_FREQ;
denom = 2 * 256 * (INT32U)OS_TICKS_PER_SEC;
OCR0 = (INT8U)((2 * num / denom + 1) / 2 - 1);
TIFR |= 0x02; /* Clear TIMER0 compare Interrupt Flag */
TIMSK |= 0x02; /* Enable TIMER0 compare Interrupt */
}
/*
*********************************************************************************************************
* HANDLE THE TICK INTERRUPT
*
* Note(s): 1) No need to clear the interrupt source since we use output compare mode for Timer #0 and
* the interrupt is automatically cleard in hardware when the ISR runs.
*********************************************************************************************************
*/
void BSP_TickISR_Handler (void)
{
OSTimeTick();
}
/*
*********************************************************************************************************
* BSP INITIALIZATION
*
* Description : This function should be called by your application code before you make use of any of the
* functions found in this module.
*
* Arguments : none
*********************************************************************************************************
*/
static void LED_Init (void)
{
DDRD = 0xFF; /* All PORTD pins are outputs */
PORTD = 0xFF;
LED_Off(0); /* Turn ON all the LEDs */
}
/*
*********************************************************************************************************
* LED ON
*
* Description : This function is used to control any or all the LEDs on the board.
*
* Arguments : led is the number of the LED to control
* 0 indicates that you want ALL the LEDs to be ON
* 1 turns ON LED1 on the board
* .
* .
* 8 turns ON LED8 on the board
*********************************************************************************************************
*/
void LED_On (INT8U led)
{
switch (led) {
case 0:
PORTD = 0x00;
break;
case 1:
PORTD &= ~0x01;
break;
case 2:
PORTD &= ~0x02;
break;
case 3:
PORTD &= ~0x04;
break;
case 4:
PORTD &= ~0x08;
break;
case 5:
PORTD &= ~0x10;
break;
case 6:
PORTD &= ~0x20;
break;
case 7:
PORTD &= ~0x40;
break;
case 8:
PORTD &= ~0x80;
break;
}
}
/*
*********************************************************************************************************
* LED OFF
*
* Description : This function is used to control any or all the LEDs on the board.
*
* Arguments : led is the number of the LED to turn OFF
* 0 indicates that you want ALL the LEDs to be OFF
* 1 turns OFF LED1 on the board
* .
* .
* 8 turns OFF LED8 on the board
*********************************************************************************************************
*/
void LED_Off (INT8U led)
{
switch (led) {
case 0:
PORTD = 0xFF;
break;
case 1:
PORTD |= 0x01;
break;
case 2:
PORTD |= 0x02;
break;
case 3:
PORTD |= 0x04;
break;
case 4:
PORTD |= 0x08;
break;
case 5:
PORTD |= 0x10;
break;
case 6:
PORTD |= 0x20;
break;
case 7:
PORTD |= 0x40;
break;
case 8:
PORTD |= 0x80;
break;
}
}
/*
*********************************************************************************************************
* LED TOGGLE
*
* Description : This function is used to toggle the state of any or all the LEDs on the board.
*
* Arguments : led is the number of the LED to toggle
* 0 indicates that you want ALL the LEDs to toggle
* 1 Toggle LED1 on the board
* .
* .
* 8 Toggle LED8 on the board
*********************************************************************************************************
*/
void LED_Toggle (INT8U led)
{
switch (led) {
case 0:
PORTD ^= 0xFF;
break;
case 1:
PORTD ^= 0x01;
break;
case 2:
PORTD ^= 0x02;
break;
case 3:
PORTD ^= 0x04;
break;
case 4:
PORTD ^= 0x08;
break;
case 5:
PORTD ^= 0x10;
break;
case 6:
PORTD ^= 0x20;
break;
case 7:
PORTD ^= 0x40;
break;
case 8:
PORTD ^= 0x80;
break;
}
}
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