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我用一个SD模块(SPI接口)和一个8位数码管模块连在一块UNO R3板子上,SD模块用D!!,D12,D13,D4
数码管模块用D5,D6,D7,并分别连上5v,我想让一个数据显示在数码管上,并且写到SD卡里去,可是现在出现单用数码管模块或者单用SD卡模块都可以,同时接好的话,就连SD卡的初始化都不行了,下面是我的程序
SD用的是官方库文件
/*
SD card read/write
This example shows how to read and write data to and from an SD card file
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4
created Nov 2010
by David A. Mellis
updated 2 Dec 2010
by Tom Igoe
This example code is in the public domain.
*/
#include <SD.h>
File myFile;
//Pin connected to ST_CP of 74HC595
int latchPin = 7;
//Pin connected to SH_CP of 74HC595
int clockPin = 6;
////Pin connected to DS of 74HC595
int dataPin = 5;
int tab[]={0x03,0x9f,0x25,0x0d,0x99,0x49,0x41,0x1f};
void ShowLED(int data)
{
for(int i = 0; i < 8; i++)// display 0-7
{
digitalWrite(latchPin, LOW);
shiftOut(dataPin, clockPin, LSBFIRST,tab[7-i]);
digitalWrite(latchPin, HIGH);
delay(1000);
}
while(1)//stop refresh the registers,then the numbers display steady
{
digitalWrite(latchPin, HIGH);
}
}
void setup()
{
Serial.begin(9600);
Serial.print("Initializing SD card...");
// On the Ethernet Shield, CS is pin 4. It's set as an output by default.
// Note that even if it's not used as the CS pin, the hardware SS pin
// (10 on most Arduino boards, 53 on the Mega) must be left as an output
// or the SD library functions will not work.
pinMode(10, OUTPUT);
if (!SD.begin(4)) {
Serial.println("initialization failed!");
while(1);
// return;
}
Serial.println("initialization done.");
//set pins to output because they are addressed in the main loop
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
for(int i = 0; i < 8; i++)// shut off all the segments before being displayed
{
digitalWrite(latchPin, LOW);
shiftOut(dataPin, clockPin, LSBFIRST,0xff);
digitalWrite(latchPin, HIGH);
delay(10);
}
}
void loop()
{
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open("test.txt", FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to test.txt...");
myFile.println("01234567");
ShowLED(0);
delay(3000);
// close the file:
myFile.close();
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
} |
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楼主
发表于 2013-7-21 19:27