[问答]

24LC024超过16字节读写就不正常怎么解决？

问答对人有帮助，内容完整，我也想知道答案 0 针对这种EEPROM器件，根据芯片手册配置，不超过16字节读写正常，超过就不对，会覆盖之前的内容，就是说永远只写前16个地址，后面的地址没有写上，看了半天也不知道是怎么回事？有没有哪位用过，给个提示。主控制器用的STM32F103。读写控制代码如下：#define ADDR_24LC02_Write 0xA0 #define ADDR_24LC02_Read 0xA1 #define BufferSize 34 HAL_I2C_Mem_Write( hi2c2, ADDR_24LC02_Write, 0, I2C_MEMADD_SIZE_8BIT, WriteBuffer, BufferSize, 0x10); HAL_I2C_Mem_Read( hi2c2, ADDR_24LC02_Read, 0, I2C_MEMADD_SIZE_8BIT, ReadBuffer, BufferSize, 0x10); WriteBuffer写入数据依次为1-34；ReadBuffer读取仅有33,34,19,20,21,22,23,24,25,26,27,28,29,30,31,32。只能读到16个地址数，我认为是写的时候只写了16个地址，数据一直在前16个地址上覆盖。 0 本主题由 Harmony技术专家于 2024-4-15 14:23 审核通过
2024-4-15 06:21:09　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × heks 该类别下有 50 个回答。邀请回答 hgimtk 该类别下有 44 个回答。邀请回答新星之火12138 该类别下有 42 个回答。邀请回答 wang21cj 该类别下有 41 个回答。邀请回答 chm5 该类别下有 40 个回答。邀请回答 hjfjsdgfjdsf 该类别下有 37 个回答。邀请回答 werywer 该类别下有 35 个回答。邀请回答 h1654155957.9520 该类别下有 35 个回答。邀请回答 fdjslkjd 该类别下有 35 个回答。邀请回答 uvysdfydad 该类别下有 35 个回答。邀请回答 jenny042 该类别下有 34 个回答。邀请回答 dfzvzs 该类别下有 34 个回答。邀请回答维生素B2 该类别下有 34 个回答。邀请回答凤毛麟角该类别下有 34 个回答。邀请回答 ggfvxv 该类别下有 33 个回答。邀请回答刘洋该类别下有 33 个回答。邀请回答 meihuacg 该类别下有 33 个回答。邀请回答 hfgdzc 该类别下有 33 个回答。邀请回答 h1654155275.6678 该类别下有 32 个回答。邀请回答河南顺之航该类别下有 32 个回答。邀请回答举报李骏鹏相关推荐 • keil MDK中程序读写结构体成员进入HARDFAUL HANDLE RET为什么无法读写？ 227 • STM32G070挂载4个设备，切换SPI极性和相位之后数据不正常是什么原因导致的？ 170 • 利用软件模拟i2c读写EEPROM，超过256个字节就读写不了了的原因？如何处理？ 304 • AD421负载超过300欧姆输出电流就不正常 2818 • AD421负载超过300欧母时间输出电流就不正常，问题出在哪里？ 312 • 51单片机串口怎么才能接收600个字节？ 851 • 如何使用FileX_LevelX使一个文件可以存储超过512字节？ 765 • 如何访问所有256字节？ 902 • CH438硬件复位寄存器读取不正常怎么处理？ 374 • STM32F407的LWIP移植UDP数据超过256字节的数据不能接收 2504 1个回答

答案对人有帮助，有参考价值 0 EEPROM不能直接跨页写，要跨页的话，得重新指定一次新的页地址，同时得有一次停止位。理解一下这段代码，其中NumOfPage、NumOfSingle两个变量，以及I2C_FLASH_PAGESIZE。 /** * @brief Writes buffer of data to the I2C EEPROM. * @param pBuffer : pointer to the buffer containing the data to be * written to the EEPROM. * @param WriteAddr : EEPROM's internal address to write to. * @param NumByteToWrite : number of bytes to write to the EEPROM. * @retval None / void I2C_EE_BufferWrite(uint8_t pBuffer, uint16_t WriteAddr, uint16_t NumByteToWrite) { uint8_t NumOfPage = 0, NumOfSingle = 0, count = 0; uint16_t Addr = 0; Addr = WriteAddr % I2C_FLASH_PAGESIZE; count = I2C_FLASH_PAGESIZE - Addr; NumOfPage = NumByteToWrite / I2C_FLASH_PAGESIZE; NumOfSingle = NumByteToWrite % I2C_FLASH_PAGESIZE; /* If WriteAddr is I2C_FLASH_PAGESIZE aligned / if(Addr == 0) { / If NumByteToWrite < I2C_FLASH_PAGESIZE / if(NumOfPage == 0) { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); I2C_EE_WaitEepromStandbyState(); } / If NumByteToWrite > I2C_FLASH_PAGESIZE / else { while(NumOfPage--) { I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_FLASH_PAGESIZE); I2C_EE_WaitEepromStandbyState(); WriteAddr += I2C_FLASH_PAGESIZE; pBuffer += I2C_FLASH_PAGESIZE; } if(NumOfSingle!=0) { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); I2C_EE_WaitEepromStandbyState(); } } } / If WriteAddr is not I2C_FLASH_PAGESIZE aligned / else { / If NumByteToWrite < I2C_FLASH_PAGESIZE / if(NumOfPage== 0) { / If the number of data to be written is more than the remaining space in the current page: / if (NumByteToWrite > count) { / Write the data conained in same page / I2C_EE_PageWrite(pBuffer, WriteAddr, count); I2C_EE_WaitEepromStandbyState(); / Write the remaining data in the following page / I2C_EE_PageWrite((uint8_t)(pBuffer + count), (WriteAddr + count), (NumByteToWrite - count)); I2C_EE_WaitEepromStandbyState(); } else { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); I2C_EE_WaitEepromStandbyState(); } } /* If NumByteToWrite > I2C_FLASH_PAGESIZE / else { NumByteToWrite -= count; NumOfPage = NumByteToWrite / I2C_FLASH_PAGESIZE; NumOfSingle = NumByteToWrite % I2C_FLASH_PAGESIZE; if(count != 0) { I2C_EE_PageWrite(pBuffer, WriteAddr, count); I2C_EE_WaitEepromStandbyState(); WriteAddr += count; pBuffer += count; } while(NumOfPage--) { I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_FLASH_PAGESIZE); I2C_EE_WaitEepromStandbyState(); WriteAddr += I2C_FLASH_PAGESIZE; pBuffer += I2C_FLASH_PAGESIZE; } if(NumOfSingle != 0) { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); I2C_EE_WaitEepromStandbyState(); } } } } /* * @brief Writes more than one byte to the EEPROM with a single WRITE cycle. * @note The number of byte can't exceed the EEPROM page size. * @param pBuffer : pointer to the buffer containing the data to be * written to the EEPROM. * @param WriteAddr : EEPROM's internal address to write to. * @param NumByteToWrite : number of bytes to write to the EEPROM. * @retval None / void I2C_EE_PageWrite(uint8_t pBuffer, uint16_t WriteAddr, uint8_t NumByteToWrite) { /* While the bus is busy / while(I2C_GetFlagStatus(I2C_EE, I2C_FLAG_BUSY)); / Send START condition / I2C_GenerateSTART(I2C_EE, ENABLE); / Test on EV5 and clear it / while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_MODE_SELECT)); / Send EEPROM address for write / I2C_Send7bitAddress(I2C_EE, EEPROM_ADDRESS, I2C_Direction_Transmitter); / Test on EV6 and clear it / while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); #ifdef EE_M24C08 / Send the EEPROM's internal address to write to : only one byte Address / I2C_SendData(I2C_EE, WriteAddr); #elif defined(EE_M24C64_32) / Send the EEPROM's internal address to write to : MSB of the address first / I2C_SendData(I2C_EE, (uint8_t)((WriteAddr 0xFF00) >> 8)); / Test on EV8 and clear it / while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); / Send the EEPROM's internal address to write to : LSB of the address / I2C_SendData(I2C_EE, (uint8_t)(WriteAddr 0x00FF)); #endif / EE_M24C08 / / Test on EV8 and clear it / while(! I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); / While there is data to be written / while(NumByteToWrite--) { / Send the current byte / I2C_SendData(I2C_EE, pBuffer); /* Point to the next byte to be written / pBuffer++; / Test on EV8 and clear it / while (!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); } / Send STOP condition / I2C_GenerateSTOP(I2C_EE, ENABLE); } /* * @brief Wait for EEPROM Standby state * @param None * @retval None / void I2C_EE_WaitEepromStandbyState(void) { __IO uint16_t SR1_Tmp = 0; do { / Send START condition / I2C_GenerateSTART(I2C_EE, ENABLE); / Read I2C_EE SR1 register to clear pending flags / SR1_Tmp = I2C_ReadRegister(I2C_EE, I2C_Register_SR1); / Send EEPROM address for write / I2C_Send7bitAddress(I2C_EE, EEPROM_ADDRESS, I2C_Direction_Transmitter); }while(!(I2C_ReadRegister(I2C_EE, I2C_Register_SR1) 0x0002)); / Clear AF flag / I2C_ClearFlag(I2C_EE, I2C_FLAG_AF); / STOP condition */ I2C_GenerateSTOP(I2C_EE, ENABLE); }

2024-4-15 14:19:05 评论举报杨兰兰