i2c的write、writeto、write_mem分别适用于什么场合？
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本帖最后由 9zhmke 于 2018-2-22 00:52 编辑 import time from machine import Pin,I2C i2c=I2C(-1, sda=Pin(4), scl=Pin(5), freq=100000) #scl=1脚绿线,sda=2脚黄线 buf = buf_bak = bytes(16) #准备放取出的红外定位传感器数据 x=[4] #准备放x轴地址 y=[4] #准备放y轴地址 tmp=0 #很随意个变量 i2c_init=[0x30,0x01,0x30,0x08,0x06,0x90,0x08,0xC0,0x1A,0x40,0x33,0x33] #看上去要传这一串到传感器去 i2c.start() for i in range(0,12,2): time.sleep_ms(10) i2c.write(chr(i2c_init[i])) #i2c.writeto(0x58,chr(i2c_init[i]),False) #i2c.scan实测地址为0x58，与厂标相同 time.sleep_ms(5) i2c.write(chr(i2c_init[i+1])) #官方示例Arduino程序是一对一对发送的，间隔10ms time.sleep_ms(100) def Read_Ir(): global buf,buf_bak buf_bak=buf #先备份之关数据 buf=bytes(16) #清空，下一句读出与之前数据相同、为空、没数据(xFF)或者出错均重新再取，直到取出与之前不相同的内容 while(buf==buf_bak or buf==bytes(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') or buf==bytes(b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff')): time.sleep_ms(3) i2c.write(chr(0x36)) #看上去0x36是取数据前置信号 try: time.sleep_ms(5) buf=i2c.readfrom(i2c_address[0],16,True) except Exception as e: print("Err") return #==========================开始========================== #while(True): for i in range(0,10): Read_Ir() print(i,end=" ") print("buf",end=":") print (buf) print(i,end=" ") print ("Bak",end=":") print (buf_bak) 复制代码 // Wii Remote IR sensor test sample code by kako [url=http://www.kako.com]http://www.kako.com[/url] // modified output for Wii-BlobTrack program by RobotFreak [url=http://www.letsmakerobots.com/user/1433]http://www.letsmakerobots.com/user/1433[/url] // modified for [url=http://DFRobot.com]http://DFRobot.com[/url] by Lumi, Jan. 2014 // 对位置的调整可参考英文版：[url=http://wiibrew.org/wiki/Wiimote/Pointing]http://wiibrew.org/wiki/Wiimote/Pointing[/url] // 维客：[url=http://wiibrew.org/wiki/Wiimote#IR_Camera]http://wiibrew.org/wiki/Wiimote#IR_Camera[/url] #include <Wire.h> int IRsensorAddress = 0xB0; //int IRsensorAddress = 0x58; int slaveAddress; int ledPin = 13; boolean ledState = false; byte data_buf[16]; int i; int Ix[4]; int Iy[4]; int s; void Write_2bytes(byte d1, byte d2) { Wire.beginTransmission(slaveAddress); Wire.write(d1); Wire.write(d2); Wire.endTransmission(); } void setup() { slaveAddress = IRsensorAddress >> 1; // This results in 0x21 as the address to pass to TWI Serial.begin(19200); pinMode(ledPin, OUTPUT); // Set the LED pin as output Wire.begin(); // IR sensor initialize Write_2bytes(0x30,0x01); delay(10); Write_2bytes(0x30,0x08); delay(10); Write_2bytes(0x06,0x90); delay(10); Write_2bytes(0x08,0xC0); delay(10); Write_2bytes(0x1A,0x40); delay(10); Write_2bytes(0x33,0x33); delay(10); delay(100); } void loop() { ledState = !ledState; if (ledState) { digitalWrite(ledPin,HIGH); } else { digitalWrite(ledPin,LOW); } //IR sensor read Wire.beginTransmission(slaveAddress); Wire.write(0x36); Wire.endTransmission(); Wire.requestFrom(slaveAddress, 16); // Request the 2 byte heading (MSB comes first) for (i=0;i<16;i++) { data_buf[i]=0; } i=0; while(Wire.available() && i < 16) { data_buf[i] = Wire.read(); i++; } Ix[0] = data_buf[1]; Iy[0] = data_buf[2]; s = data_buf[3]; Ix[0] += (s & 0x30) <<4; Iy[0] += (s & 0xC0) <<2; Ix[1] = data_buf[4]; Iy[1] = data_buf[5]; s = data_buf[6]; Ix[1] += (s & 0x30) <<4; Iy[1] += (s & 0xC0) <<2; Ix[2] = data_buf[7]; Iy[2] = data_buf[8]; s = data_buf[9]; Ix[2] += (s & 0x30) <<4; Iy[2] += (s & 0xC0) <<2; Ix[3] = data_buf[10]; Iy[3] = data_buf[11]; s = data_buf[12]; Ix[3] += (s & 0x30) <<4; Iy[3] += (s & 0xC0) <<2; for(i=0; i<4; i++) { if (Ix[i] < 1000) Serial.print(""); if (Ix[i] < 100) Serial.print(""); if (Ix[i] < 10) Serial.print(""); Serial.print( int(Ix[i]) ); Serial.print(","); if (Iy[i] < 1000) Serial.print(""); if (Iy[i] < 100) Serial.print(""); if (Iy[i] < 10) Serial.print(""); Serial.print( int(Iy[i]) ); if (i<3) Serial.print(","); } Serial.println(""); delay(15); } 复制代码
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