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