stm32 f103用TM1637驱动数码管

其中读键部分，无符号变量参与右移运算，然后把无符号返回成有符号变量。因为是改的TM1638的程序，不知道为毛他这么搞，所以把类型改成有符号的了，结果出错。搞了半天才搞明白：有符号变量右移的时候，如果是正数左边填0，如果是负数，左边填1。这是基础的东西，结果搞了半天。接下来还得复习一下C语言了。

接线啥的参考手册。TM1637和TM1638不一样，TM1638驱动共阴数码管比较方便，TM1637驱动共阳数码管比较方便。另外TM1637供电电压是5V，高电平低值为0.7VDD，也就是3.5V，而我这个f103是3.3V的，但是很多端口都耐受5V，所以找了一个可以耐受5V的端口，用开漏输出，上拉10k电阻，顺便还可以直接读键。另外那个数码管的时钟点，真的是麻烦，TM1637的SG口只有8个，偏偏这两个时钟点的阳极是连在公共点上的，所以只好再浪费一或二个单片机IO口了。时钟点部分没有写，反正也简单的。下面是TM1637.c的内容。很简略，下次用得上的时候再说。

#include "TM1637.h"
#include "delay.h"
#include "usart.h"
/*********************define and global variables*********************************************/
#define CLK GPIO_Pin_10                                      //clock line
#define DIO GPIO_Pin_11                                                                      //data line
#define Set(x) GPIO_SetBits(GPIOB,(x))              //Sets the selected data port bits
#define Reset(x) GPIO_ResetBits(GPIOB,(x))          //Resets the selected data port bits
#define Get(x) GPIO_ReadInputDataBit(GPIOB,(x))        //Read the specified input port pin
uint16_t const tm_dat[2][14]={{'0','1','2','3','4','5',     //the char and its segment code 
            '6','7','8','9','.','-','_',' '},
            {0x3F,0x06,0x5B,0x4F,0x66,0x6D,
            0x7D,0x07,0x7F,0x6F,0x80,0x40,
            0x08,0x00}};
void RCC_Config(){
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
}
void GPIO_Config(){
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_OD;
    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Pin=CLK|DIO;
    GPIO_Init(GPIOB,&GPIO_InitStructure);
	Set(CLK);
	Set(DIO);
}
void TM1637_start()
{
	delay_us(1);
	Reset(DIO);
	
}
void TM1637_ack()
{
	delay_us(1);
	Reset(CLK);
	Set(DIO);
	while(Get(DIO));
	Reset(DIO);
	Set(CLK);
	delay_us(1);
	Reset(CLK);//
}
void TM1637_stop()
{
	delay_us(1);
	Set(CLK);
	delay_us(1);
	Set(DIO);
}
void Write_Byte(uint8_t byte){
    uint8_t i=0;
    for(i=0;i<8;i++){
        Reset(CLK);
        if(byte&0x01){
            Set(DIO);
        }else{
            Reset(DIO);
        }
        Set(CLK);
        byte>>=1;
    }
}
void Write_Cmd(uint8_t cmd)
{
	TM1637_start();
    Write_Byte(cmd);
	TM1637_ack();
	TM1637_stop();
}
void Write_Dat(uint8_t addr,uint8_t dat){
	TM1637_start();
    Write_Byte(0xc0|addr);
	TM1637_ack();
	Write_Byte(dat);
	TM1637_ack();
	TM1637_stop();
}
int8_t Read_Key(){
    uint8_t i=0;
    uint8_t temp=0x00;
	TM1637_start();
	Write_Byte(0x42);
	TM1637_ack();
	Set(DIO);
	delay_us(5);
    for(i=0;i<8;i++){
        Set(CLK);
        temp>>=1;
        if(Get(DIO)){
            temp|=0x80;
        }
		delay_us(5);
        Reset(CLK);
		delay_us(5);
    }
	TM1637_ack();
	TM1637_stop();
	temp=-(int8_t)temp-8;
	if((int8_t)temp==-7) temp=0;
    return temp;
}
void TM1637_SendData(uint8_t i,char * str){
    int j=0,k=0;
    unsigned char chr;
	
	Write_Cmd(0x44);
    for(;i<8;i++){
        k=0;
        for(j=0;j<14;j++){
            if(*str==tm_dat[0][j]){
                chr=tm_dat[1][j];
                k=1;
                break;
            }
        }
        if(k==0) chr=0x00;
        if(*(str+1)=='.'){
            chr|=0x80;
            Write_Dat(i,chr);
            str++;
        }else{
            Write_Dat(i,chr);
        }
        str++;
        if(*str=='\0')break;
    }
}
void TM1637_SendIntData(uint8_t i,int num)
{
    char a;
    a = num + '0';
    TM1637_SendData(i,&a);
}
void TM1637_Init(){
    int i=0;
    RCC_Config();
    GPIO_Config();
    Write_Cmd(0x8a);
	Write_Cmd(0x44);
    for(i=0;i<6;i++){
        Write_Dat(i,0x00);
    }
}

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#include "TM1637.h"

#include "delay.h"

#include "usart.h"

/*********************define and global variables*********************************************/

#define CLK GPIO_Pin_10 //clock line

#define DIO GPIO_Pin_11 //data line

#define Set(x) GPIO_SetBits(GPIOB,(x)) //Sets the selected data port bits

#define Reset(x) GPIO_ResetBits(GPIOB,(x)) //Resets the selected data port bits

#define Get(x) GPIO_ReadInputDataBit(GPIOB,(x)) //Read the specified input port pin

uint16_t const tm_dat[2][14]={{'0','1','2','3','4','5', //the char and its segment code

'6','7','8','9','.','-','_',' '},

{0x3F,0x06,0x5B,0x4F,0x66,0x6D,

0x7D,0x07,0x7F,0x6F,0x80,0x40,

0x08,0x00}};

void RCC_Config(){

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);

}

void GPIO_Config(){

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_OD;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Pin=CLK|DIO;

GPIO_Init(GPIOB,&GPIO_InitStructure);

Set(CLK);

Set(DIO);

}

void TM1637_start()

{

delay_us(1);

Reset(DIO);

}

void TM1637_ack()

{

delay_us(1);

Reset(CLK);

Set(DIO);

while(Get(DIO));

Reset(DIO);

Set(CLK);

delay_us(1);

Reset(CLK);//

}

void TM1637_stop()

{

delay_us(1);

Set(CLK);

delay_us(1);

Set(DIO);

}

void Write_Byte(uint8_t byte){

uint8_t i=0;

for(i=0;i<8;i++){

Reset(CLK);

if(byte&0x01){

Set(DIO);

}else{

Reset(DIO);

}

Set(CLK);

byte>>=1;

}

void Write_Cmd(uint8_t cmd)

{

TM1637_start();

Write_Byte(cmd);

TM1637_ack();

TM1637_stop();

}

void Write_Dat(uint8_t addr,uint8_t dat){

TM1637_start();

Write_Byte(0xc0|addr);

TM1637_ack();

Write_Byte(dat);

TM1637_ack();

TM1637_stop();

}

int8_t Read_Key(){

uint8_t i=0;

uint8_t temp=0x00;

TM1637_start();

Write_Byte(0x42);

TM1637_ack();

Set(DIO);

delay_us(5);

for(i=0;i<8;i++){

Set(CLK);

temp>>=1;

if(Get(DIO)){

temp|=0x80;

}

delay_us(5);

Reset(CLK);

delay_us(5);

}

TM1637_ack();

TM1637_stop();

temp=-(int8_t)temp-8;

if((int8_t)temp==-7) temp=0;

return temp;

}

void TM1637_SendData(uint8_t i,char * str){

int j=0,k=0;

unsigned char chr;

Write_Cmd(0x44);

for(;i<8;i++){

k=0;

for(j=0;j<14;j++){

if(*str==tm_dat[0][j]){

chr=tm_dat[1][j];

k=1;

break;

}

if(k==0) chr=0x00;

if(*(str+1)=='.'){

chr|=0x80;

Write_Dat(i,chr);

str++;

}else{

Write_Dat(i,chr);

}

str++;

if(*str=='\0')break;

}

void TM1637_SendIntData(uint8_t i,int num)

{

char a;

a = num + '0';

TM1637_SendData(i,&a);

}

void TM1637_Init(){

int i=0;

RCC_Config();

GPIO_Config();

Write_Cmd(0x8a);

Write_Cmd(0x44);

for(i=0;i<6;i++){

Write_Dat(i,0x00);

}