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TMS320F28035 I2Ca外设模块SCL时钟信号无输出

user4938334
Prodigy 175 points
Other Parts Discussed in Thread: TMS320F28035

前提条件：1.TMS320F28035系统时钟为60MHz

2.I2C时钟配置为10MHz，并使能外设时钟

3.SCL时钟配置为400kHz，然后使能I2C模块

4.GPIO32---SDA,GPIO33---SCL

结果：用示波器观察不到SCL引脚波形，一直是高电平，请问各位大神，这是什么原因啊

  • 0
    TI__Intellectual 2245 points
    请参考一下CONTROL SUITE里的I2C_EEPROM例程，先测试一下该例程能否工作，并在例程基础上进行一下修改。
  • 0
    Prodigy 175 points
    当设置为
    I2caRegs.I2CPSC.all = 5; // Prescaler - 10MHz = 60MHz/(5 + 1)
    I2caRegs.I2CCLKL = 10; // NOTE: must be non zero
    I2caRegs.I2CCLKH = 5; // NOTE: must be non zero
    400kHz时钟频率时，SCL无输出，

    后来改为
    I2caRegs.I2CPSC.all = 6; // Prescaler - 8.57MHz = 60MHz/(6 + 1)
    I2caRegs.I2CCLKL = 10; // NOTE: must be non zero
    I2caRegs.I2CCLKH = 5; // NOTE: must be non zero
    SCL波形正常