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Update the C code of the 4-digital-display

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After the system is updated, in the ShiftOut function, the IO port pin
changes too fast, resulting in communication abnormality with 74HC595.
In the update, the SHIFT function is override.
This commit is contained in:
Suhayl
2018-07-16 09:01:47 +08:00
parent 9afdd9a547
commit 3ac92b9442
1 changed files with 32 additions and 8 deletions
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Code/C_Code/18.2.1_StopWatch/StopWatch.c
+32 -8
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@@ -2,7 +2,7 @@
* Filename : StopWatch.c
* Description : Control 4_Digit_7_Segment_Display by 74HC595
* Author : freenove
* modification: 2016/07/07
* modification: 2018/07/16
**********************************************************************/
#include <wiringPi.h>
#include <stdio.h>
@@ -23,24 +23,48 @@ void selectDigit(int digit){
digitalWrite(digitPin[2],((digit&0x02) == 0x02) ? LOW : HIGH);
digitalWrite(digitPin[3],((digit&0x01) == 0x01) ? LOW : HIGH);
}
void outData(int8_t data){ //function used to output data for 74HC595输出数据函数
void _shiftOut(int dPin,int cPin,int order,int val){
int i;
for(i = 0; i < 8; i++){
digitalWrite(cPin,LOW);
if(order == LSBFIRST){
digitalWrite(dPin,((0x01&(val>>i)) == 0x01) ? HIGH : LOW);
delayMicroseconds(1);
}
else {//if(order == MSBFIRST){
digitalWrite(dPin,((0x80&(val<<i)) == 0x80) ? HIGH : LOW);
delayMicroseconds(1);
}
digitalWrite(cPin,HIGH);
delayMicroseconds(1);
}
}
void outData(int8_t data){ //function used to output data for 74HC595
digitalWrite(latchPin,LOW);
shiftOut(dataPin,clockPin,MSBFIRST,data);
_shiftOut(dataPin,clockPin,MSBFIRST,data);
digitalWrite(latchPin,HIGH);
}
void display(int dec){ //display function for 7-segment display
int delays = 1;
outData(0xff);
selectDigit(0x01); //select the first, and display the single digit
outData(num[dec%10]);
delay(1); //display duration
delay(delays); //display duration
outData(0xff);
selectDigit(0x02); //select the second, and display the tens digit
outData(num[dec%100/10]);
delay(1);
delay(delays);
outData(0xff);
selectDigit(0x04); //select the third, and display the hundreds digit
outData(num[dec%1000/100]);
delay(1);
delay(delays);
outData(0xff);
selectDigit(0x08); //select the fourth, and display the thousands digit
outData(num[dec%10000/1000]);
delay(1);
delay(delays);
}
void timer(int sig){ //Timer function
if(sig == SIGALRM){ //If the signal is SIGALRM, the value of counter plus 1, and update the number displayed by 7-segment display
@@ -62,7 +86,7 @@ int main(void)
//set the pin connected to 7-segment display common end to output mode
for(i=0;i<4;i++){
pinMode(digitPin[i],OUTPUT);
digitalWrite(digitPin[i],LOW);
digitalWrite(digitPin[i],HIGH);
}
signal(SIGALRM,timer); //configure the timer
alarm(1); //set the time of timer to 1s