lpc1752详细的 io口模拟i2c

/* I2Cint.c 文件*/ #include “I2CINT.h“ #include “LPC17xx.h“ #define DELAY_TIME 5 #define SDA (1 FIODIR1 |=SDA #define SDA_1() LPC_GPIO0-FIOSET1 |=SDA #define SDA_0() LPC_GPIO0-FIOCLR1 |=SDA #define SCL (1 FIODIR1 |= SCL #define SCL_1() LPC_GPIO0-FIOSET1 |= SCL #define SCL_0() LPC_GPIO0-FIOCLR1 |= SCL #define SDA_INT() LPC_GPIO0-FIODIR1 volatile INT8U address; volatile INT8U data; /* * * Function name: myDelay * Descriptions: * input parameters: * */ void myDelay(INT32U ulTime) INT32U i; i = 0; while (ulTime-) for (i = 0; i PINSEL0 LPC_PINCON-PINSEL4 SDA_OUT(); SCL_OUT(); LED_on(); DELAY(50000); LED_off(); void I2C_Start(void) SDA_1(); SCL_1(); DELAY(DELAY_TIME); SDA_0(); DELAY(DELAY_TIME); SCL_0(); DELAY(DELAY_TIME); void I2C_Stop(void) SDA_0(); SCL_1(); DELAY(DELAY_TIME); SDA_1(); DELAY(DELAY_TIME); /*0* */ void SEND_0(void) SDA_0(); DELAY(DELAY_TIME); SCL_1(); DELAY(DELAY_TIME); SCL_0(); DELAY(DELAY_TIME); /*1* */ void SEND_1(void) SDA_1(); DELAY(DELAY_TIME); SCL_1(); DELAY(DELAY_TIME); SCL_0(); DELAY(DELAY_TIME); void I2C_Acknowledge(void) SDA_0(); DELAY(DELAY_TIME); SCL_1(); DELAY(DELAY_TIME); SCL_0(); DELAY(DELAY_TIME); void Check_Acknowledge(void) SDA_INT(); DELAY(DELAY_TIME); SCL_0(); DELAY(DELAY_TIME); SCL_1(); DELAY(DELAY_TIME); ack = LPC_GPIO0-FIOPIN1 SCL_0(); DELAY(DELAY_TIME); SDA_OUT(); if (ack=0) else while (1) LED_on(); LED_off(); /* * * Function name: I2C_WriteNByte * Returned value: NONE * */ void I2C_WriteNByte(INT8U sla,INT8U suba_type_one, INT8U suba,INT8U suba_type_two,INT8U *p,INT8U *s, INT8U num) INT8U N; INT8U DEC; INT8U DECy; INT8U nz; INT8U ny; INT8U i; /用来判断能否写满一页 INT8U j; /第几轮写入数据 INT8U k; (num-k)是写入数据的字节数 INT8U n; DEC=(*p)*16+(*(p+1); /16 进制转 10 进制 DECy=16-DEC%16; /第一轮写入时所剩空间的大小 if(numDECy) /计算换页次数 n=1; else n=0; nz=(num-DECy)/16; if(num-DECy)%16)0) ny=1; else ny=0; /计算换页次数 N=n+nz+ny; /页写次数 N 换页次数 N-1 for(;N0;N-) INT8U bit,a; suba_type_one=8; suba_type_two=8; j+; I2C_Start(); /发送起始信号 for(;suba_type_one=1;suba_type_one-) /发送从机地址 address = (sla(suba_type_one-1) if (address=1) SEND_1(); else SEND_0(); Check_Acknowledge();/检测从机应答信号 for(;suba_type_two=1;suba_type_two-) /发送从机子地址 address = (suba(suba_type_two-1) if (address=1) SEND_1(); else SEND_0(); Check_Acknowledge(); if(j=1) /第一次跳页的从机子地址 suba=suba+(DECy)%256); else suba=suba+0x10; /第 n+1 次跳页的从机子地址（n=1 ） i=(num-16)0)?(num-16):0);/如果未写入的数据能够写满一页则写 一页否则全部写入 if(j=1) if(numDECy) /第一轮时要写入的字节数大于所剩空间的 大小则写入所剩空间个数个数据 k=(num-DECy); else k=0; /第一轮时要写入的字节数小于等于所剩空间的 大小则写入全部数据 else k=i; /第 n+1 次写入数据时（ n=1） for(;numk;num-) bit=8; a= *s+; for(;bit=1;bit-) data = (a(bit-1) if (data=1) SEND_1(); else SEND_0(); Check_Acknowledge(); I2C_Stop(); myDelay(200); /写周期延迟时间 /* * * Function name: I2C_ReadNByte * */ void I2C_ReadNByte (INT8U sla,INT8U suba_type_one, INT8U suba,INT8U suba_type_two, INT8U *s, INT8U num) INT8U temp; INT8U sla_r; sla_r=sla+1; I2C_Start(); for(;suba_type_one=1;suba_type_one-) /伪写指令 address = (sla(suba_type_one-1) if (address=1) SEND_1(); else SEND_0(); Check_Acknowledge(); for(;suba_type_two=1;suba_type_two-) address = (suba(suba_type_two-1) if (address=1) SEND_1(); else SEND_0(); Check_Acknowledge(); I2C_Start(); suba_type_one=8; for(;suba_type_one=1;suba_type_one-) /读指令 address = (sla_r(suba_type_one-1) if (address=1) SEND_1(); else SEND_0(); Check_Acknowledge(); for(;num0;num-) INT8U b8; INT8U a; INT8U i; i=8; for (; i=1; i-) SDA_INT(); DELAY(DELAY_TIME); SCL_0(); DELAY(DELAY_TIME); SCL_1(); DELAY(DELAY_TIME); temp=LPC_GPIO0-FIOPIN1; a=(temp b8-i=(aFIODIR |= BEEP #define BEEP_OFF() LPC_GPIO0-FIOSET |= BEEP #define BEEP_ON() LPC_GPIO0-FIOCLR |= BEEP #define AT24C02 0xA4 int main(void) INT8U Data_Buf32,Receive_Buf32,Address_dec2; INT8U i; SystemInit(); BEEP_INIT(); BEEP_ON(); myDelay(200); BEEP_OFF(); GPIOInit( ); Address_dec0=0; /子地址 高四位 Address_dec1=0; /子地址 低四位 for (i = 0; i 32; i+) Data_Bufi = (i+0) ; I2C_WriteNByte(AT24C02, 8, 0x00,8,Address_dec, Data_Buf, 32); /（从机地址，位数从机子地址，位数，子地址数组，发送数据数组，发送字节数） I2C_ReadNByte (AT24C02, 8, 0x00,8, R