1 /*Include---------------------------*/
2 #include"stm32f10x_lib.h" //包含所有的头文件
3 #include<stdio.h>
4
5 //----------------函数声明--------------------
6 void Delay_MS(u16 dly);
7 void RCC_Configuration(void);
8 void GPIO_Configuration(void);
9 void USART3_Configuration(void);
10
11
12 u8 tab[] = "hello welcome to class !";
13
14 /*******************************************************************************
15 * Function Name : main
16 * Description : Main program.
17 * Input : None
18 * Output : None
19 * Return : None
20 *******************************************************************************/
21 int main(void)
22 {
23 u8 i ,id_num[12];;
24 #ifdef DEBUG
25 debug();
26 #endif
27 //------------初始化------------
28 RCC_Configuration();
29 GPIO_Configuration();
30 USART3_Configuration();
31
32 id_num[0] = *((u8*)(0x1FFFF7E9)); //stm32芯片id的放置地址,96位id；12字节
33 printf("hello world\n");
34 //------------向usart3发送数据-----------
35 for(i=0;i<12;i++)
36 {
37 USART_SendData(USART3, tab[i]);
38 id_num[i] = *((u8*)(0x1FFFF7E9+i));
39 USART_SendData(USART3, id_num[i]); //将id发送给串口
40 Delay_MS(2000);
41 // while(USART_ GetFlagStatus(USART_FLAG_TC)==RESET)
42 // ;
43 }
44
45 }
46
47 /*******************************************************************************
48 * Function Name : Delay_Ms
49 * Description : delay 1 ms.
50 * Input : dly (ms)
51 * Output : None
52 * Return : None
53 *******************************************************************************/
54 void Delay_MS(u16 dly)
55 {
56 u16 i,j;
57 for(i=0;i<dly;i++)
58 for(j=1000;j>0;j--);
59 }
60
61 /*******************************************************************************
62 * Function Name : RCC_Configuration
63 * Description : Configures the different system clocks.
64 * Input : None
65 * Output : None
66 * Return : None
67 *******************************************************************************/
68 void RCC_Configuration(void)
69 {
70 //----------使用外部RC晶振-----------
71 RCC_DeInit(); //初始化为缺省值
72 RCC_HSEConfig(RCC_HSE_ON); //使能外部的高速时钟
73 while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET); //等待外部高速时钟使能就绪
74
75 FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); //Enable Prefetch Buffer
76 FLASH_SetLatency(FLASH_Latency_2); //Flash 2 wait state
77
78 RCC_HCLKConfig(RCC_SYSCLK_Div1); //HCLK = SYSCLK
79 RCC_PCLK2Config(RCC_HCLK_Div1); //PCLK2 = HCLK
80 RCC_PCLK1Config(RCC_HCLK_Div2); //PCLK1 = HCLK/2
81 RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9); //PLLCLK = 8MHZ * 9 =72MHZ
82 RCC_PLLCmd(ENABLE); //Enable PLLCLK
83
84 while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); //Wait till PLLCLK is ready
85 RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); //Select PLL as system clock
86 while(RCC_GetSYSCLKSource()!=0x08); //Wait till PLL is used as system clock source
87
88 //---------打开相应外设时钟--------------------
89 RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //使能APB2外设的GPIOC的时钟
90 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE); //复用功能时钟开启
91 }
92
93 /*******************************************************************************
94 * Function Name : GPIO_Configuration
95 * Description : 初始化GPIO外设
96 * Input : None
97 * Output : None
98 * Return : None
99 *******************************************************************************/
100 //由电路图可知；配置PC10,PC11引脚
101 void GPIO_Configuration(void)
102 {
103 //CLK:PB5 CLR:PE11 DATA:PE10
104 GPIO_InitTypeDef GPIO_InitStructure; //声明一个结构体变量
105 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //选择PB.1-
106 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //管脚频率为50MHZ
107 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //输出模式为 "复用推挽输出"
108 GPIO_Init(GPIOC,&GPIO_InitStructure); //初始化GPIOB寄存器
109
110 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 |GPIO_Pin_11 ; //选择PE.10 PE.11
111 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //管脚频率为50MHZ
112 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //输出模式为 "浮空输入"
113 GPIO_Init(GPIOC,&GPIO_InitStructure); //初始化GPIOE寄存器
114
115 //开启时钟 必须在RCC_Configuration中设置
116
117
118 //端口重映射：PC10/PC11
119 GPIO_PinRemapConfig(GPIO_PartialRemap_USART3, ENABLE);
120 }
121
122 void USART3_Configuration(void)
123 {
124 USART_InitTypeDef USART_InitStructure;
125 USART_InitStructure.USART_BaudRate = 9600;
126 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
127 USART_InitStructure.USART_StopBits = USART_StopBits_1;
128 USART_InitStructure.USART_Parity = USART_Parity_No;
129 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
130 USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
131
132 USART_Init(USART3, &USART_InitStructure);
133
134 USART_Cmd(USART3, ENABLE); //开启使能
135 }
136
137 /***********************************************************
138 name: fputc *
139 Description:重定向这个c库printf函数，文件流--->串口USART *
140 *
141 ************************************************************/
142 int fputc(int ch,FILE *f)
143 {
144 //ch发送给USART1
145 USART_SendData(USART3, ch);
146 //等待发送完毕
147 while(USART_GetFlagStatus(USART3, USART_FLAG_TC)==RESET)
148 ;
149 return ch;
150 }
