在pcDuino上运行Linker LED Bar
本帖最后由 Lily 于 2014-2-28 18:02 编辑LED light bar 原理其实很简单，跟我们平常过的数码管一样，只是我们公司的这个模块用了一个LED驱动芯片MY9221来驱动，这样可以将很多个模块串联起来。MY9221是一个带有跟SPI十分相似的LED驱动芯片，可以驱动12个LED灯，每个LED灯的亮度都可以由串行接口送进来的数据进行PWM调制。
一、试验器材：1套pcduin套件、1块Linker LED Bar、连接线
二、试验连线图：电源（VCC）请接到pcduino v2上的3.3V上，电线（GND）请接在pcduino v2的GND上。数据时钟（DCLK），跟数据输入（DIN）可以随便接在两个数字接口上（D0至D13）都行，但一定要跟例程代码里面的定义相同
三、试验代码：/*
* LED bar test program
*/
#include <core.h>
#define DATA_Pin 4//DATA IN
#define CLK_Pin5//CLK IN
#define LED_pin 2
#define CmdMode 0x0000//Work on 8-bit mode
#define ON 0x0005 //8-bit 1 data
#define SHUT 0x0000 //8-bit 0 data
void send16bitData(unsigned int data)
{
unsigned char i;
boolean clk_pin_state;
clk_pin_state = digitalRead(CLK_Pin);
for(i=0;i<16;i++)
{
if(data & 0x8000) digitalWrite(DATA_Pin, HIGH);
else digitalWrite(DATA_Pin, LOW);
clk_pin_state = !clk_pin_state;
digitalWrite(CLK_Pin, clk_pin_state);
data <<= 1;
delayMicroseconds(1);
}
}
//latch routine for MY9221 data exchange
void latchData(void)
{
unsigned char i;
boolean data_pin_state;
digitalWrite(DATA_Pin, LOW);
data_pin_state = LOW;
delayMicroseconds(300);
for(i=0;i<8;i++)
{
data_pin_state = !data_pin_state;
digitalWrite(DATA_Pin, data_pin_state);
delayMicroseconds(1);
}
delayMicroseconds(300);
}
void sendLED(unsigned int LEDstate)
{
unsigned char i;
for(i=0;i<12;i++)
{
if(LEDstate&0x0001)send16bitData(ON);
elsesend16bitData(SHUT);
LEDstate >>= 1;
}
}
void setup()
{
pinMode(DATA_Pin,OUTPUT); //Data pin
pinMode(CLK_Pin,OUTPUT);//CLK pin
pinMode(LED_pin,OUTPUT);//LED_pin
digitalWrite(DATA_Pin, LOW);
digitalWrite(CLK_Pin, LOW);
}
void loop()
{
unsigned int tmpInt;
for(tmpInt=1;tmpInt < 0xFFF;tmpInt |= (tmpInt<<1))
{
send16bitData(CmdMode); /file:///C:\Users\ADMINI~1.PC-\AppData\Local\Temp\V7(XMWRN]{G8~CI}BCCR3QC.gift LED Bar mode
sendLED(tmpInt); /file:///C:\Users\ADMINI~1.PC-\AppData\Local\Temp\V7(XMWRN]{G8~CI}BCCR3QC.gifnd LED Bar data
latchData();//make it come into effect
delay(100);
}
digitalWrite(LED_pin, LOW);
for(;tmpInt != 0;tmpInt >>=1)
{
send16bitData(CmdMode); /file:///C:\Users\ADMINI~1.PC-\AppData\Local\Temp\V7(XMWRN]{G8~CI}BCCR3QC.gift LED Bar mode
sendLED(tmpInt); /file:///C:\Users\ADMINI~1.PC-\AppData\Local\Temp\V7(XMWRN]{G8~CI}BCCR3QC.gifnd LED Bar data
latchData();//make it come into effect
delay(100);
}
send16bitData(CmdMode); /file:///C:\Users\ADMINI~1.PC-\AppData\Local\Temp\V7(XMWRN]{G8~CI}BCCR3QC.gift LED Bar mode
sendLED(0); /file:///C:\Users\ADMINI~1.PC-\AppData\Local\Temp\V7(XMWRN]{G8~CI}BCCR3QC.gifnd LED Bar data
latchData();//make it come into effect
delay(100);
digitalWrite(LED_pin, HIGH);
}
四、运行结果如图：http://linksprite.com/wiki/index.php5?title=Products-description#pcDuino
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