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 导航:老古开发网首页→文章索引→索引第262页 →文章分类→PIC MSP430 →第2页→[通用MSP430—I2C程序]
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第590篇:通用MSP430—I2C程序 |
| 发布时间:2004年2月25日 点击次数:7250 |
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//通用MSP430—I2C程序 //收藏：清风徐徐 //QQ：78779514 //EMAIL：XSL88888@TOM.com //2004.2.4 //===================================// #include "MSP430x14x.h" //P3.2 SCL //P3.3 SDA #define SDA_1 P3OUT |= BIT3 //SDA = 1 #define SDA_0 P3OUT &=~ BIT3 //SDA = 0 #define SCL_1 P3OUT |= BIT2 //SCL = 1 #define SCL_0 P3OUT &=~ BIT2 //SCL = 0 #define DIR_IN P3DIR &=~ BIT3; SDA_1 //I/O口为输入 #define DIR_OUT P3DIR |= BIT3 //I/0口为输出 #define SDA_IN ((P3IN >> 3) & 0x01) //Read SDA unsigned int a[50]; static void Delay(unsigned int n) { unsigned int i; for (i=0; i void Init(void) { SCL_1; Delay(5); SDA_1; Delay(5); } void Start(void) { SDA_1; Delay(5); SCL_1; Delay(5); SDA_0; Delay(5); SCL_0; Delay(5); } void Stop(void) { SDA_0; Delay(5); SCL_1; Delay(5); SDA_1; Delay(5); } void WriteByte(unsigned char WriteData) { unsigned char i; for (i=0; i<8; i++) { SCL_0; Delay(5); if (((WriteData >> 7) & 0x01) == 0x01) { SDA_1; } else { SDA_0; } Delay(5); SCL_1; WriteData = WriteData << 1; Delay(5); } SCL_0; SDA_1; Delay(5); Delay(5); } unsigned char ReadByte(void) { unsigned char i; unsigned char TempBit = 0; unsigned char TempData = 0; SCL_0; Delay(5); SDA_1; for (i=0; i<8; i++) { Delay(5); SCL_1; Delay(5); DIR_IN; if (SDA_IN == 0x01 /*sda==1*/) { TempBit = 1; } else { TempBit = 0; } DIR_OUT; TempData = (TempData << 1) | TempBit; SCL_0; } Delay(5); return(TempData); } void ReceiveAck(void) { unsigned char i = 0; SCL_1; Delay(5); DIR_IN; while ((SDA_IN == 0x01 /*sda==1*/) && (i < 255)/*调试方便,可以不要*/) { i++; } DIR_OUT; SCL_0; Delay(5); } void Acknowledge(void) { SCL_0; Delay(5); DIR_OUT; SDA_0; SCL_1; Delay(5); SCL_0; } unsigned int ReadWord(unsigned char unit/*address*/) { unsigned char HighData = 0; unsigned char LowData = 0; unsigned int TempData = 0; Start(); WriteByte(0xa0); ReceiveAck(); WriteByte(unit); ReceiveAck(); Start(); WriteByte(0xa1); ReceiveAck(); LowData = ReadByte(); Acknowledge(); HighData = ReadByte(); Stop(); TempData = (HighData << 8) + LowData; Delay(1000); return(TempData); } void ReadWords(unsigned char unit/*address*/) { unsigned char i; unsigned char HighData = 0; unsigned char LowData = 0; unsigned int TempData = 0; Start(); WriteByte(0xa0); ReceiveAck(); WriteByte(unit); ReceiveAck(); Start(); WriteByte(0xa1); ReceiveAck(); for (i=0; i<49; i++) { LowData = ReadByte(); Acknowledge(); HighData = ReadByte(); Acknowledge(); a[i]= (HighData << 8) + LowData; } LowData = ReadByte(); Acknowledge(); HighData = ReadByte(); Stop(); a[49] = (HighData << 8) + LowData; Delay(1000); } void WriteWord(unsigned char unit/*address*/, unsigned int WriteData) { unsigned char LowData = 0; unsigned char HighData = 0; LowData = (unsigned char)WriteData; HighData = (unsigned char)(WriteData >> 8); Start(); WriteByte(0xa0); ReceiveAck(); WriteByte(unit); ReceiveAck(); WriteByte(LowData); ReceiveAck(); WriteByte(HighData); ReceiveAck(); Stop(); Delay(2000); } |
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