blob: 29732cb636802ac7602375775785e612c0041175 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* 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)
{
PUR3.BIT.PU37 = 1;
PD11.BIT.PD11_0 = 1;
led_off();
}
void led_on(void)
{
P11.BIT.P11_0 = 0;
}
void led_off(void)
{
P11.BIT.P11_0 = 1;
}
static void mcu_init(void)
{
volatile rt_uint32_t count;
/* Configure clock for divide by 1 mode */
PRCR.BYTE |= 0x01; /* Enable access to clock registers PRCR.PRC0 = 1 */
CM1.BYTE = 0x20; /* Set CM16, CM17 divide ratio to 1: */
/* ... main clock on in high drive no PLL */
CM0.BYTE &= ~0x40; /* Set divide ratio to 1 CM0.CM06 = 0 */
/* Configure main PLL */
PRCR.BYTE |= 0x02; /* Allow writing to processor mode register PRCR.PRC0 = 1 */
PM2.BYTE |= 0x01; /* Set SFR access to 2 wait, which is required for */
/* ... operation greater than 16 MHz PM2.PM20 = 1 */
PRCR.BYTE &= ~0x02; /* Protect processor mode register PRCR.PRC0 = 0 */
PLC0.BYTE = 0x91; /* Enable and turn on PLL */
count = 20000; /* Delay while PLL stabilizes */
while (count > 0) {
count--;
}
CM1.BYTE |= 0x02; /* Switch to PLL CM1.CM11 = 1 */
PRCR.BYTE &= ~0x01; /* Protect clock control register PRCR.PRC0 = 0 */
PRCR.BYTE |= 0x02; /* Allow writing to processor mode register PRCR.PRC0 = 1 */
PM1.BYTE |= 0x01; /* Enable data flash area PM1.PM10 = 1 */
PRCR.BYTE &= ~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.BYTE = 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.BYTE = 0x07;
TABSR.BYTE |= 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 */
}
|
