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workshop:통신 [2012/06/25 21:48] – 203.247.149.205workshop:통신 [2018/07/18 14:10] (current) – external edit 127.0.0.1
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-칩간에 통신을 실험해보자!+IC와 통신 하기 
  
-====== WS2801 ======+* [[/UART]] 
 +* [[/OneWire]] 
 +* [[/I2C]] 
 +* [[/SPI]]
  
-LED 드라이버 +칩간에 통신을 실험해보자!
- +
-회로도 +
-{{http://i.imgur.com/v1Tol.png?300}} +
- +
-Time +
- +
-{{http://i.imgur.com/zG6jm.png?400}} +
- +
-<code> +
-int SDI = 11;  +
-int CKI = 12;   +
-int ledPin = 13; // LED +
- +
-void setup() { +
-  pinMode(SDI, OUTPUT); +
-  pinMode(CKI, OUTPUT); +
-  pinMode(ledPin, OUTPUT); +
-   +
-  //Serial.begin(9600); +
-  //Serial.println("Hello!"); +
-} +
- +
-void loop() { +
-  delay(2000); +
- +
-  while(1){  +
-    post_frame(0xFF0000); //현재 칼라를 WS2801에 적용한다. +
- +
-    // CLK pin keeps low more than 500uS will make the WS2801 internal status register reset +
-    digitalWrite(CKI, LOW); +
-    delayMicroseconds(500); +
-     +
-    digitalWrite(ledPin, HIGH);     +
-    delay(250);                   +
-    digitalWrite(ledPin, LOW);    +
-    delay(250);                   +
-  } +
-} +
- +
-// this_led_color값의 비트를 ws2801에 CKI에 맞추어 SDI를 밀어 넣는다. +
-void post_frame (long this_led_color) { +
-  for(byte color_bit = 23 ; color_bit != 255 ; color_bit--) { +
-      //23비트가 처음! 빨간색 (red data MSB) +
-       +
-      digitalWrite(CKI, LOW); //클럭이 LOW일때 데이터를 받아 들인다. +
-       +
-      long mask = 1L << color_bit; +
-      //The 1'L' forces the 1 to start as a 32 bit number, otherwise it defaults to 16-bit. +
-       +
-      if(this_led_color & mask)  +
-        digitalWrite(SDI, HIGH); +
-      else +
-        digitalWrite(SDI, LOW); +
-   +
-      digitalWrite(CKI, HIGH); //클럭이 HIGH일때 데이터를 적용(latch) 한다. +
-  } +
-} +
-</code> +
- +
-여러개 보낼경우. 이어서 보낸다. +
-<code> +
-post_frame(0xFF0000); //첫번째 프레임 +
-post_frame(0x00FF00); //두번째 프레임 +
-// CLK pin keeps low more than 500uS will make the WS2801 internal status register reset +
-digitalWrite(CKI, LOW); +
-delayMicroseconds(500); +
-   +
-</code> +
-====== I2C ====== +
-I2C 직렬 컴퓨터 버스 주변기기를 연결하기 위해 사용된다. +
- +
-{{http://i.imgur.com/99a3Z.png?300}} +
- +
-데이터와 클럭은 pull-up +
- +
-{{http://i.imgur.com/U3al8.png?300}} +
- +
-Time +
- +
-{{http://i.imgur.com/NtRbM.png?300}} +
- +
-{{http://i.imgur.com/dgtdQ.png?300}} +
- +
-실제 실험 해보기 +
-24LC256 +
- +
-arduino i2c 관련 핀 +
-  * Analog4 - SDA +
-  * Analog5 - SCL +
- +
-Time +
- +
-{{http://i.imgur.com/VQtTJ.png?300}} +
- +
-<code> +
-#include <Wire.h> //Include the Arduino I2C Library +
- +
-void i2c_eeprom_write_byte( int deviceaddress, unsigned int eeaddress, byte data ) { +
-  int rdata = data; +
- +
-  Wire.beginTransmission(deviceaddress); +
-  Wire.write((int)(eeaddress >> 8)); // MSB +
-  Wire.write((int)(eeaddress & 0xFF)); // LSB +
-  Wire.write(rdata); +
-  Wire.endTransmission(); +
-} +
- +
-void i2c_eeprom_write_page( int deviceaddress, unsigned int eeaddresspage, byte* data, byte length ) { +
-  Wire.beginTransmission(deviceaddress); +
-  Wire.write((int)(eeaddresspage >> 8)); // MSB +
-  Wire.write((int)(eeaddresspage & 0xFF)); // LSB +
- +
-  byte c; +
-  for ( c = 0; c < length; c++) +
-    Wire.write(data[c]); +
- +
-  Wire.endTransmission(); +
-} +
- +
-byte i2c_eeprom_read_byte( int deviceaddress, unsigned int eeaddress ) { +
-  byte rdata = 0xFF; +
- +
-//  Wire.beginTransmission(deviceaddress); +
-//  Wire.write((int)(eeaddress >> 8)); // MSB +
-//  Wire.write((int)(eeaddress & 0xFF)); // LSB +
-//  Wire.endTransmission(); +
-//  Wire.requestFrom(deviceaddress,1); +
- +
-  if (Wire.available()) rdata = Wire.read(); +
- +
-  return rdata; +
-} +
- +
-void setup() { +
-  char data[] = "hello world"; +
-  Wire.begin(); //Start I2C connections +
-  Serial.begin(9600); +
-  i2c_eeprom_write_page(0x50, 0, (byte *)data, sizeof(data)); // write to EEPROM +
- +
-  delay(10); //add a small delay +
- +
-  Serial.println("Memory written"); +
-} +
- +
-void loop() { +
-  int addr=0; //EEPROM Address 0 +
-  byte b = i2c_eeprom_read_byte(0x50, 0); // access the first address from the memory +
- +
-  while (b!=0) { +
-   Serial.print((char)b); //print content to serial port +
-   addr++; //increase address +
-   b = i2c_eeprom_read_byte(0x50, addr); //access an address from the memory +
- } +
- +
-  Serial.println(" "); +
-  delay(2000); +
-} +
-</code> +
- +
- +
-master가 slave에 데이터를 보낸다. +
- +
-{{http://i.imgur.com/lHqBZ.png?300}} +
- +
-master가 slave의 데이터를 읽는다.+
  
-{{http://i.imgur.com/NE9xJ.png?300}} 
workshop/통신.1340660937.txt.gz · Last modified: 2018/07/18 14:09 (external edit)