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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/******************************************************************************
* The MIT License
*
* Copyright (c) 2011 LeafLabs, LLC.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
/*
* This file is a modified version of a file obtained from
* CodeSourcery Inc. (now part of Mentor Graphics Corp.), in which the
* following text appeared:
*
* Copyright (c) 2006, 2007 CodeSourcery Inc
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice is included verbatim in any distributions. No written agreement,
* license, or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their authors
* and need not follow the licensing terms described here, provided that
* the new terms are clearly indicated on the first page of each file where
* they apply.
*/
#include <stddef.h>
#include <libmaple/rcc.h>
#include <libmaple/libmaple.h>
#include <libmaple/bitband.h>
#include "rcc_private.h"
#include <libmaple/usart.h>
#include <libmaple/gpio.h>
#include "usart_private.h"
#include <libmaple/sdio.h>
#include <string.h>
extern void __libc_init_array(void);
extern int main(int, char**, char**);
extern void exit(int) __attribute__((noreturn, weak));
/* The linker must ensure that these are at least 4-byte aligned. */
extern char __data_start__, __data_end__;
extern char __bss_start__, __bss_end__;
struct rom_img_cfg {
int *img_start;
};
extern char _lm_rom_img_cfgp;
extern void __lm_error();
extern void timer_disable_all();
/* Turn off ADC */
extern void adc_disable_all();
/* Turn off all USARTs */
extern void usart_disable_all();
extern void DisableEverything();
void __attribute__((noreturn)) start_c(void) {
struct rom_img_cfg *img_cfg = (struct rom_img_cfg*)&_lm_rom_img_cfgp;
int *src = img_cfg->img_start;
int *dst = (int*)&__data_start__;
int exit_code;
asm("CPSID I");
/* Reset the RCC clock configuration to the default reset state(for debug purpose) */
/* Set HSION bit */
RCC_BASE->CR |= 0x00000001U;
/* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
RCC_BASE->CFGR &= 0xF0FF0000U;
/* Reset HSEON, CSSON and PLLON bits */
RCC_BASE->CR &= 0xFEF6FFFFU;
/* Reset HSEBYP bit */
RCC_BASE->CR &= 0xFFFBFFFFU;
/* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
RCC_BASE->CFGR &= 0xFF80FFFFU;
/* Disable all interrupts and clear pending bits */
RCC_BASE->CIR = 0x009F0000U;
USART1_BASE->CR1 = 0;
USART1_BASE->CR2 = 0;
USART1_BASE->CR3 = 0;
memset(SDIO_BASE, 0, sizeof(sdio_reg_map));
asm("CPSIE I");
/* Initialize .data, if necessary. */
if (src != dst) {
int *end = (int*)&__data_end__;
while (dst < end) {
*dst++ = *src++;
}
}
/* Zero .bss. */
dst = (int*)&__bss_start__;
while (dst < (int*)&__bss_end__) {
*dst++ = 0;
}
/* Run initializers. */
__libc_init_array();
/* Jump to main. */
exit_code = main(0, 0, 0);
if (exit) {
exit(exit_code);
}
/* If exit is NULL, make sure we don't return. */
for (;;)
continue;
}
|
