Differences

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--- workshop:통신 [2012/06/25 21:51] – 203.247.149.205
+++ workshop:통신 [2018/07/18 14:10] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-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; // PIN 11
-int CKI = 12; // PIN 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 ======
-I2C직렬 컴퓨터 버스주변기기를 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
-LC256
-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}}