109 lines
5.0 KiB
C
109 lines
5.0 KiB
C
/*
|
|
* File : bsp.c
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2009, RT-Thread Development Team
|
|
*
|
|
* The license and distribution terms for this file may be
|
|
* found in the file LICENSE in this distribution or at
|
|
* http://www.rt-thread.org/license/LICENSE
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2010-04-09 fify the first version
|
|
*
|
|
* For : Renesas M16C
|
|
* Toolchain : IAR's EW for M16C v3.401
|
|
*/
|
|
|
|
#include "iom16c62p.h"
|
|
#include "bsp.h"
|
|
#include "rtconfig.h"
|
|
|
|
void led_init(void)
|
|
{
|
|
pu37 = 1;
|
|
pd11_0 = 1;
|
|
|
|
led_off();
|
|
}
|
|
|
|
void led_on(void)
|
|
{
|
|
p11_0 = 0;
|
|
}
|
|
|
|
void led_off(void)
|
|
{
|
|
p11_0 = 1;
|
|
}
|
|
|
|
static void mcu_init(void)
|
|
{
|
|
volatile rt_uint32_t count;
|
|
/* Configure clock for divide by 1 mode */
|
|
prcr |= 0x01; /* Enable access to clock registers PRCR.PRC0 = 1 */
|
|
cm1 = 0x20; /* Set CM16, CM17 divide ratio to 1: */
|
|
/* ... main clock on in high drive no PLL */
|
|
cm0 &= ~0x40; /* Set divide ratio to 1 CM0.CM06 = 0 */
|
|
|
|
/* Configure main PLL */
|
|
prcr |= 0x02; /* Allow writing to processor mode register PRCR.PRC0 = 1 */
|
|
pm2 |= 0x01; /* Set SFR access to 2 wait, which is required for */
|
|
/* ... operation greater than 16 MHz PM2.PM20 = 1 */
|
|
prcr &= ~0x02; /* Protect processor mode register PRCR.PRC0 = 0 */
|
|
plc0 = 0x91; /* Enable and turn on PLL */
|
|
|
|
count = 20000; /* Delay while PLL stabilizes */
|
|
while (count > 0) {
|
|
count--;
|
|
}
|
|
|
|
cm1 |= 0x02; /* Switch to PLL CM1.CM11 = 1 */
|
|
prcr &= ~0x01; /* Protect clock control register PRCR.PRC0 = 0 */
|
|
|
|
prcr |= 0x02; /* Allow writing to processor mode register PRCR.PRC0 = 1 */
|
|
pm1 |= 0x01; /* Enable data flash area PM1.PM10 = 1 */
|
|
prcr &= ~0x02; /* Protect processor mode register PRCR.PRC0 = 0 */
|
|
}
|
|
|
|
/*
|
|
*********************************************************************************************************
|
|
* TICKER INITIALIZATION
|
|
*
|
|
* Description : This function is called to initialize rt-thread's tick source (typically a timer generating
|
|
* interrupts every 1 to 100 mS).
|
|
*
|
|
* We decided to use Timer #B0 as the tick interrupt source.
|
|
*
|
|
* Arguments : none
|
|
*
|
|
* Returns :
|
|
*
|
|
* Notes : (1) Timer B channel 0 is setup as a periodic timer, generating an interrupt
|
|
* OS_TICKS_PER_SEC times per second. The timer counts down and generates an interrupt
|
|
* when it underflows.
|
|
*
|
|
* (2) The timer ISR handler, rt_hw_timer_handler(), is placed into the vector table in vectors.s34.
|
|
*********************************************************************************************************
|
|
*/
|
|
|
|
static void timer_tick_init(void)
|
|
{
|
|
/* Set timer to timer mode */
|
|
/* Set count source as PLL clock / 8 (f8) */
|
|
tb0mr = 0x40;
|
|
/* Assign timer value and reload value */
|
|
tb0 = (CPU_CLK_FREQ / 8) / RT_TICK_PER_SECOND;
|
|
/* Set timer B channel 0 interrupt level = 7 */
|
|
/* Clear interrupt request */
|
|
tb0ic = 0x07;
|
|
tabsr |= 0x20; /* Start timer */
|
|
}
|
|
|
|
void system_init(void)
|
|
{
|
|
mcu_init();
|
|
led_init(); /* Initialize the I/Os for the LED controls */
|
|
timer_tick_init(); /* Initialize the rt-thread tick interrupt */
|
|
}
|