[问答]

I2C工作有时会失败

问答对人有帮助，内容完整，我也想知道答案 0 设备：16F1824编译器：XC8V1.45 ID:XV4.01问题：I2C通信有时工作I2C配置代码：这是我的I2C代码：这是主代码。C：有时命令命令失败标志被设置，有时命令Debug失败标志被清除，我需要家伙检查我的I2C流来检查这是不是如果上述代码是正确的：从属芯片的ADC每秒扫描数据（电压、电流等），将这些数据存储到EEPROM寄存器中，然后将操作寄存器映射到EEPROM寄存器中，只有I2C可以通信的是操作寄存器。在芯片向操作寄存器中更新数据时，从芯片是否可能对主响应？非常感谢！谢谢您。以上来自于百度翻译以下为原文 device: 16F1824 compiler: XC8 v1.45 IDE: X v4.01 PROBLEM: I2C communication SOMETIMES works The I2C configuration code: SSPADD = 0x0a; // clock frequency of SLK = Fosc/(SSPADD+1)4 = 100KHz have error, tuning it to 80Khz SSP1STATbits.CKE = 1; // SMBus compatible SSP1CON = 0b00101000; // bit 7: WCOL = 0 // bit 6: SSPOV = 0 Receive Overflow Indicator bit // bit 5: SSPEN = 1 // bit 4: CKP no use in I2C master mode // bit 3-0: 1000 = I2C Master mode, clock = FOSC/(4 (SSP1ADD+1))(4) SSP1CON3 = 0b01110000; // bit 7: ACKTIM 0 = Not an Acknowledge sequence, cleared on 9TH rising edge of SCL clock // bit 6: PCIE 1 = Enable interrupt on detection of Stop condition // bit 5: SCIE 1 = Enable interrupt on detection of Start or Restart conditions // bit 4: BOEN This bit is ignored in I2C master mode // bit 3: SDAHT (I don't know what this do) // bit 2: SBCDE (I2C Slave mode only) // bit 1: AHEN (I2C Slave mode only) // bit 0: DHEN (I2C Slave mode only) This is my I2C code: bit I2C_Start(void) { while ( ( SSPCON2 & 0x1F ) \|\| ( R_nW ) ); // Idle? SSP1CON2bits.SEN = 1; // Initial start condition while (SSP1CON2bits.SEN != 0); if (PIR2bits.BCL1IF == 1){ PIR2bits.BCL1IF = 0; return FAILURE; } else{ PIR1bits.SSP1IF = 0; return SUCCESS; } } bit I2C_RepeatedStart(void) { while ( ( SSPCON2 & 0x1F ) \|\| ( R_nW ) ); // Idle? SSPCON2bits.RSEN = 1; while (SSP1CON2bits.RSEN != 0); if (PIR2bits.BCL1IF == 1){ PIR2bits.BCL1IF = 0; return FAILURE; } else{ PIR1bits.SSP1IF = 0; return SUCCESS; } } bit I2C_SendAddress(const unsigned char address) { while ( ( SSPCON2 & 0x1F ) \|\| ( R_nW ) ); // Idle? SSP1BUF=address; if(SSP1CON2bits.ACKSTAT == 1){ //slave沒回應 return FAILURE; } else{ if(PIR2bits.BCL1IF == 1){ PIR2bits.BCL1IF == 0; return FAILURE; } else return SUCCESS; } } unsigned char I2C_Receive(void) { while ( ( SSPCON2 & 0x1F ) \|\| ( R_nW ) ); // Idle? SSP1CON2bits.RCEN = 1; // 1 = Enables Receive mode for I2C while(SSP1CON2bits.RCEN != 0); PIR1bits.SSP1IF = 0; return SSP1BUF; } bit I2C_AckSequence(unsigned char AckOrNack) { while ( ( SSPCON2 & 0x1F ) \|\| ( R_nW ) ); // Idle? SSPCON2bits.ACKDT = AckOrNack; //Ack = 0, Nack = 1 SSPCON2bits.ACKEN = 1; // tell slave while(SSPCON2bits.ACKEN != 0); if(PIR2bits.BCL1IF == 1){ return FAILURE; } else{ PIR1bits.SSP1IF = 0; return SUCCESS; } } bit I2C_Stop(void) { while ( ( SSPCON2 & 0x1F ) \|\| ( R_nW ) ); // Idle? SSP1CON2bits.PEN = 1; while(SSP1CON2bits.PEN != 0); if (PIR2bits.BCL1IF == 1){ return FAILURE; } else{ PIR1bits.SSP1IF = 0; return SUCCESS; } } This is code in main.c: if( I2C_Start() == FAILURE ) I2C_FLAGbits.START_FAILURE = 1; else I2C_FLAGbits.START_FAILURE = 0; if( I2C_SendAddress(OZ8920_W) == FAILURE ) I2C_FLAGbits.SLAVE_W_FAILURE = 1; else I2C_FLAGbits.SLAVE_W_FAILURE = 0; if( I2C_SendAddress(VOLTAGE) == FAILURE ) I2C_FLAGbits.COMMAND_FAILURE = 1; else I2C_FLAGbits.COMMAND_FAILURE = 0; if( I2C_RepeatedStart() == FAILURE ) I2C_FLAGbits.REPEATED_FAILURE = 1; else I2C_FLAGbits.REPEATED_FAILURE = 0; if( I2C_SendAddress(OZ8920_R) == FAILURE ) I2C_FLAGbits.SLAVE_R_FAILURE = 1; else I2C_FLAGbits.SLAVE_R_FAILURE = 0; Sometimes COMMAND_FAILURE flag is set, sometimes COMMAND_FAILURE flag is cleared, I need guys to examine my I2C flow to check whether this is wrong or not. IF the code above all are right: The slave chip's ADC scan data(voltage, current etc) every second and store these data into EEPROM register, and then Operation register is mapped into EEPROM register. Only thing I2C can communicate is operation register. Is it possible that the slave chip doesn't response to master during the chip is updating data into Operation Register? Very appreciate it! Thank you. 0
2018-12-3 11:30:48　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × qun333 该类别下有 57 个回答。邀请回答 caoguiqun 该类别下有 56 个回答。邀请回答技术发广告该类别下有 56 个回答。邀请回答 psw30 该类别下有 44 个回答。邀请回答伊丹姿子该类别下有 41 个回答。邀请回答 uwufwjrw 该类别下有 39 个回答。邀请回答 hetao1111 该类别下有 38 个回答。邀请回答 lc123617 该类别下有 35 个回答。邀请回答欧阳大大该类别下有 32 个回答。邀请回答作死不止该类别下有 31 个回答。邀请回答 asd010 该类别下有 31 个回答。邀请回答 60user92 该类别下有 29 个回答。邀请回答 wy8719 该类别下有 29 个回答。邀请回答嘻嘻爱哈哈该类别下有 28 个回答。邀请回答 haikitty 该类别下有 28 个回答。邀请回答 ju978779 该类别下有 28 个回答。邀请回答 xiuzhen122 该类别下有 27 个回答。邀请回答 pol666 该类别下有 27 个回答。邀请回答 ueywyrsdfs 该类别下有 26 个回答。邀请回答 lhly23 该类别下有 25 个回答。邀请回答举报李晓欢相关推荐 • steval-mki181v1 - i2c连接之后有时会断开连接要如何解决？ 163 • 编译C代码时，有时会报错，提示找不到头文件是为什么？怎么办？ 3069 • HAL_I2C_Mem_Read()读取I2C失败 11058 • TLV320AIC3110高温时会把I2C拉低的原因？ 139 • CubeMx有时会以错误的顺序为ADC和DMA生成初始化调用，要怎么处理？ 263 • 瑞萨仿真boot时，有时会把用户层代码擦除有时不会的原因是什么？ 838 • PICkit串行分析器可以配置为I2C吗？ 1195 • AD7124重置失败的原因？怎么解决？ 210 • CC2541的BLE设备有时会收不到服务的特征值 3609 • TAS5825M打开AGL声音有时会出现变调，为什么？ 152 1个回答

答案对人有帮助，有参考价值 0 解决了从芯片复位I2C通信中断太多的问题以上来自于百度翻译以下为原文 Problem solved. Too many interrupt result in slave's chip resetting I2C communication

2018-12-3 11:41:43 评论举报冯栋