代码收藏家 使用STM32实现流水灯效果
目录
一、STM32F103C8实现流水灯
打开keil，创建新项目
选择对应芯片
实验代码
c语言代码
//--------------APB2???????------------------------
#define RCC_AP2ENR *((unsigned volatile int*)0x40021018)
//----------------GPIOA????? ------------------------
#define GPIOA_CRL *((unsigned volatile int*)0x40010800)
#define GPIOA_ORD *((unsigned volatile int*)0x4001080C)
//----------------GPIOB????? ------------------------
#define GPIOB_CRH *((unsigned volatile int*)0x40010C04)
#define GPIOB_ORD *((unsigned volatile int*)0x40010C0C)
//----------------GPIOC????? ------------------------
#define GPIOC_CRH *((unsigned volatile int*)0x40011004)
#define GPIOC_ORD *((unsigned volatile int*)0x4001100C)
//-------------------???????-----------------------
void Delay_wxc( volatile unsigned int t)
{
unsigned int i;
while(t--)
for (i=0;i<800;i++);
}
//------------------------???--------------------------
int main()
{
int j=100;
RCC_AP2ENR|=1<<2; //APB2-GPIOA??????
RCC_AP2ENR|=1<<3; //APB2-GPIOB??????
RCC_AP2ENR|=1<<4; //APB2-GPIOC??????
//????????? RCC_APB2ENR|=1<<3|1<<4;
GPIOA_CRL&=0x0FFFFFFF; //??? ??
GPIOA_CRL|=0x20000000; //PA7????
GPIOA_ORD|=1<<7; //???????
GPIOB_CRH&=0xFFFFFF0F; //??? ??
GPIOB_CRH|=0x00000020; //PB9????
GPIOB_ORD|=1<<9; //???????
GPIOC_CRH&=0x0FFFFFFF; //??? ??
GPIOC_CRH|=0x30000000; //PC15????
GPIOC_ORD|=0x1<<15; //???????
while(j)
{
GPIOA_ORD=0x0<<7; //PB0???
Delay_wxc(1000000);
GPIOA_ORD=0x1<<7; //PB0???
Delay_wxc(1000000);
GPIOB_ORD=0x0<<9; //PB9???
Delay_wxc(1000000);
GPIOB_ORD=0x1<<9; //PB9???
Delay_wxc(1000000);
GPIOC_ORD=0x0<<15; //PC15???
Delay_wxc(1000000);
GPIOC_ORD=0x1<<15; //PC15???
Delay_wxc(1000000);
}
}
汇编语言
RCC_APB2ENR EQU 0x40021018;配置RCC寄存器,时钟,0x40021018为时钟地址
GPIOB_BASE EQU 0x40010C00
GPIOC_BASE EQU 0x40011000
GPIOA_BASE EQU 0x40010800
GPIOB_CRL EQU 0x40010C00
GPIOC_CRH EQU 0x40011004
GPIOA_CRL EQU 0x40010800
GPIOB_ODR EQU 0x40010C0C
GPIOC_ODR EQU 0x4001100C
GPIOA_ODR EQU 0x4001080C
Stack_Size EQU 0x00000400;栈的大小
AREA STACK, NOINIT, READWRITE, ALIGN=3 ;NOINIT： = NO Init，不初始化。READWRITE : 可读，可写。ALIGN =3 : 2^3 对齐，即8字节对齐。
Stack_Mem SPACE Stack_Size
__initial_sp
AREA RESET, DATA, READONLY
__Vectors DCD __initial_sp ; Top of Stack
DCD Reset_Handler ; Reset Handler
AREA |.text|, CODE, READONLY
THUMB
REQUIRE8
PRESERVE8
ENTRY
Reset_Handler
bl LED_Init;bl：带链接的跳转指令。当使用该指令跳转时，当前地址(PC)会自动送入LR寄存器
MainLoop BL LED_ON_C
BL Delay
BL LED_OFF_C
BL Delay
BL LED_ON_A
BL Delay
BL LED_OFF_A
BL Delay
BL LED_ON_B
BL Delay
BL LED_OFF_B
BL Delay
B MainLoop;B:无条件跳转。
LED_Init;LED初始化
PUSH {R0,R1, LR};R0,R1,LR中的值放入堆栈
;控制时钟
LDR R0,=RCC_APB2ENR;LDR是把地址装载到寄存器中(比如R0)。
ORR R0,R0,#0x1c
LDR R1,=RCC_APB2ENR
STR R0,[R1]
;初始化GPIOA_CRL
LDR R0,=GPIOA_CRL
BIC R0,R0,#0x0fffffff;BIC 先把立即数取反，再按位与
LDR R1,=GPIOA_CRL
STR R0,[R1]
LDR R0,=GPIOA_CRL
ORR R0,#0x00000001
LDR R1,=GPIOA_CRL
STR R0,[R1]
;将PA0置1
MOV R0,#0x01
LDR R1,=GPIOA_ORD
STR R0,[R1]
;初始化GPIOB_CRL
LDR R0,=GPIOB_CRL
BIC R0,R0,#0x0fffffff;BIC 先把立即数取反，再按位与
LDR R1,=GPIOB_CRL
STR R0,[R1]
LDR R0,=GPIOB_CRL
ORR R0,#0x00000001
LDR R1,=GPIOB_CRL
STR R0,[R1]
;将PB0置1
MOV R0,#0x01
LDR R1,=GPIOA_ORD
STR R0,[R1]
;初始化GPIOC
LDR R0,=GPIOC_CRH
BIC R0,R0,#0x0fffffff
LDR R1,=GPIOC_CRH
STR R0,[R1]
LDR R0,=GPIOC_CRH
ORR R0,#0x01000000
LDR R1,=GPIOC_CRH
STR R0,[R1]
;将PC15置1
MOV R0,#0x8000
LDR R1,=GPIOC_ORD
STR R0,[R1]
POP {R0,R1,PC};将栈中之前存的R0，R1，LR的值返还给R0，R1，PC
LED_ON_A
PUSH {R0,R1, LR}
MOV R0,#0x00
LDR R1,=GPIOA_ORD
STR R0,[R1]
POP {R0,R1,PC}
LED_OFF_A
PUSH {R0,R1, LR}
MOV R0,#0x01
LDR R1,=GPIOA_ORD
STR R0,[R1]
POP {R0,R1,PC}
LED_ON_B;亮灯
PUSH {R0,R1, LR}
MOV R0,#0x00
LDR R1,=GPIOB_ORD
STR R0,[R1]
POP {R0,R1,PC}
LED_OFF_B;熄灯
PUSH {R0,R1, LR}
MOV R0,#0x01
LDR R1,=GPIOB_ORD
STR R0,[R1]
POP {R0,R1,PC}
LED_ON_C;亮灯
PUSH {R0,R1, LR}
MOV R0,#0x00
LDR R1,=GPIOC_ORD
STR R0,[R1]
POP {R0,R1,PC}
LED_OFF_C;熄灯
PUSH {R0,R1, LR}
MOV R0,#0x0100
LDR R1,=GPIOC_ORD
STR R0,[R1]
POP {R0,R1,PC}
Delay
PUSH {R0,R1, LR}
MOVS R0,#0
MOVS R1,#0
MOVS R2,#0
DelayLoop0
ADDS R0,R0,#1
CMP R0,#330
BCC DelayLoop0
MOVS R0,#0
ADDS R1,R1,#1
CMP R1,#330
BCC DelayLoop0
MOVS R0,#0
MOVS R1,#0
ADDS R2,R2,#1
CMP R2,#15
BCC DelayLoop0
POP {R0,R1,PC}
NOP
END
添加驱动文件
烧录，烧录前设置生成hex文件
构筑完成后在项目文件的Objects文件中会生成hex文件
接好线路
hex文件生成后用mcuisp进行烧录
实验效果
二、注意事项
1、核心板插入面包板时尽量要看不到引脚
2、在烧录前核心板要置1
3、在烧录前检查是否能正常连接开发板，如果显示连接超时可按下reset键再试一次，如果仍无法连接，可能usb转与核心板件连接有误或没有置1.
4、在连接时，注意核心板插入哪个串口，连接串口要与核心板插入串口一致
三、总结
通过本次练习，我初步了解了stm32核心板的工作原理，并能初步使用核心板。
