stm32f3的i2c使用小结

<span style="font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">这几天拿到了stm32f3discovery，拿到手的第一件事就是测试了硬件i2c，使用stm32cube生成库，测试对象为AD5934与ADG715。经过两天的调试，完美调通。中间也碰到了些问题。</span><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">1、一开始用的I2C1，一仿真就会出现死机的情况。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>由于I2C1与swd接口重合，所以调用HAL_I2C_Init()函数后就死机，改成I2C2后问题解决。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">2、无法访问指定地址的设备</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>库函数中的入口地址并不是7bit地址，需要输入8bit。我的设备地址为13，始终无法访问设备，改为26后解决。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">3、可以读写单个地址的数据，但是不能多字节读写。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">       (1)、对于多字节写， </span>库函数中的</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">        HAL_StatusTypeDef HAL_I2C_Mem_Write(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout)</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span line-height:="" 1="" 8em="" style="word-wrap: break-word; word-break: break-all;">       其中</span><span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">MemAddSize表示地址的位数，0表示7bit地址，1表示10bit地址。我误认为这个写的字节数，所以导致在写多字节的时候出错。</span></div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">       (2)、对于多字节读，由于AD5934的读操作与库函数的读操作有些出入，所以导致一直读错误。在库函数中写完读的内存地址就开始读，而AD5934中写完block read后接着还要再写一个number bytes read然后才开始读。所以需要对库函数进行修改，新增一个函数，以适合AD5934的block read.</span></div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><a target=_blank href="/go.html?url=https://bbs.21ic.com/data/attachment/album/201504/26/203136h658z8f7k7f072k6.png" target="_blank" style="word-wrap: break-word; word-break: break-all; color: rgb(0, 102, 153); text-decoration: none;"><img src="https://bbs.21ic.com/data/attachment/album/201504/26/203136h658z8f7k7f072k6.png" style="word-wrap: break-word; word-break: break-all; border: none; max-width: 620px;" alt="" /></a></p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><span line-height:="" 1="" 8em="" style="word-wrap: break-word; word-break: break-all;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>stm32f3的i2c有三种模式：Reload、AutoEnd、SoftEnd模式。</span></p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><span line-height:="" 1="" 8em="" style="word-wrap: break-word; word-break: break-all;">        i2c每发送完一个字节，就会产生TXIS标志，当发送完最后一个字节时：</span></p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>对于Reload模式，当字节大于255字节时，必须使用此模式，此模式下发送结束后，会产生tcr标志。</p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;">        对于AutoEnd模式，发送后最后一个字节时，会自动产生STOP。</p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;">        对于<span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">SoftEnd模式，发送完最后一个字节时，会产生</span>tc标志，对于发送过程中需要Restart的需要使用此模式。</p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;">        对于AD5934的读操作，可以事先工作在SoftEnd模式，发送完<span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">block read与number bytes read字节后，再转入AutoEnd模式进行Restart，读取完指定的字节后自动产生STOP。操作流程如下：</span></p></div><span style="font-family: Tahoma, 'Microsoft Ya