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关于使用6713的I2C，SCLK被锁定的问题，请帮忙各位帮忙解答

dadi zeng
Intellectual 431 points
Other Parts Discussed in Thread: CCSTUDIO

使用I2C通信，设置的用自发自收模式，应该是循环发送，结果发完一次后，SCLK就被锁定了，详细状况可见附图（逻辑分析仪抓取的），以下是代码

void I2C0_Init()
{
puts("HI,I2C Init!");

//进入复位 IRS = 0
I2C0_MDR &= ~0x20;

//配置寄存器
//系统时钟 预分频器 225MHz / (21 + 1) = 10.25 MHz
I2C0_PSC = (0x15);

//I2C 时钟分频器 10.25 / (50) = 200KHz
I2C0_CLKL = (0x0013); //19+6 = 25
I2C0_CLKH = (0x0013); //19+6 = 25

//退出复位
I2C0_MDR |= (0x20); //IRS = 1

//5-配置主机地址
I2C0_OAR = 0x05;

//中断设置 -- 接收产生中断
// I2C0_IER = (1 << 3);
}

int I2C_WriteData(char addr, char *array, int count)
{
// int i;
char *p;
p = array;

//先前是否发送完成 检查SST位是否为1
if((I2C0_MDR & (0x01<<11)) == 1)
{
puts("previous not finished!");
return 0;
}

//从机地址
I2C0_SAR = addr;

I2C0_STR |= (1<<12);

//检查总线是否空闲 1：表示忙
if((I2C0_STR & (1<<12)))
{
return 0;
}

//计数器
I2C0_CNT = 2;

//发送开启
//进入复位 IRS = 0
I2C0_MDR |= 0x6E60;

//发送数据
while(I2C0_STR & (0x01<<1)); //ASK
while(!(I2C0_STR & (0x1<<4))); //ICXRDY
I2C0_DXR = *p++;

while(I2C0_STR & (0x01<<1));
while(!(I2C0_STR & (0x1<<4)));
I2C0_DXR = *p++;

//I2C0_MDR |= (0x1<<11);

return p-array;
}

主函数

void main()
{
// int i;
char data[2] = {5, 2};

I2C0_Init();

while(1)
{
I2C_WriteData(0x0F, data, 2);
}
}

  • 0
    Intellectual 431 points

    关于停止位消失的问题，已经解决，应该是发送完最后一个字节，要延迟一会，才能产生，因为停止位有时序要求。

    但是，后面的数组还是没出来，SCLK继续被锁定

    修改的代码：

    //发送数据
    while(I2C0_STR & (0x01<<1)); //ASK
    while(!(I2C0_STR & (0x1<<4))); //ICXRDY
    I2C0_DXR = *p++;

    while(I2C0_STR & (0x01<<1));
    while(!(I2C0_STR & (0x1<<4)));
    I2C0_DXR = *p++;

    for(i=0; i<3200; i++);    //增加的

    修改后：

  • 0 回复 dadi zeng
    TI__Guru**** 357097 points

    试试附件DSK6713 I2C DLB例程, 看能不能在你板子上运行.

  • 0 回复 Shine
    Intellectual 431 points

    Zhang,

        示例工程文件不能直接打开，我重新建立工程，出现如下错误

    undefined first referenced
    symbol in file
    --------- ----------------
    _I2C_start C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\i2c_define.obj
    _I2C_rrdy C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\i2c_define.obj
    _I2C_xrdy C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\i2c_define.obj
    _I2C_readByte C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\i2c_define.obj
    _I2C_bb C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\i2c_define.obj
    _I2C_writeByte C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\i2c_define.obj
    _I2C_open C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj
    _PLL_deassert C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj
    _PLL_enable C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj
    _PLL_bypass C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj
    _PLL_reset C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj
    _I2C_sendStop C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj
    _I2C_configArgs C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj
    _I2C_close C:\\CCStudio_v3.1\\MyProjects\\i2c\\Debug\\main.obj

    我把头文件的放到C:\CCStudio_v3.1\C6000\cgtools\include  下还是不行，请问如何解决，多谢！

  • 0 回复 dadi zeng
    Intellectual 431 points

    Zhang,

       不好意思，忘记加csl6713.lib了，示例文件能够运行，我研究下代码

  • 0 回复 dadi zeng
    TI__Guru**** 357097 points

    嗯, 例程能运行可以排除硬件问题了, 你对比一下代码, 有问题欢迎继续探讨

  • 0 回复 Shine
    Intellectual 431 points

    终于搞出来了，总结起来有如下几点，也不知道对不对：

    1.两次发送之间的间隔要保证，因为起始位和停止位都有最短的脉冲宽度要求

    2.每次发送完之后也有类似的要求

    3.每次发送前，要把机器进入复位，把上次的状态清掉

    4.如果是循环发送，要把接收寄存器的内容读走

     更改后的程序如下

    #include <stdio.h>
    #include "i2c.h"

    void I2C0_Init()
    {
    puts("HI,I2C Init!");

    //进入复位 IRS = 0
    I2C0_MDR &= ~0x20;

    //配置寄存器
    //系统时钟 预分频器 225MHz / (21 + 1) = 10.25 MHz
    I2C0_PSC = (0x15);

    //I2C 时钟分频器 10.25 / (50) = 200KHz
    I2C0_CLKL = (0x0013); //19+6 = 25
    I2C0_CLKH = (0x0013); //19+6 = 25

    //退出复位 IRS = 1
    I2C0_MDR |= (0x20);

    //配置主机地址
    I2C0_OAR = 0x05;

    //中断设置 -- 接收产生中断
    // I2C0_IER = (1 << 3);
    }

    void I2C_EdmaInit(void)
    {

    }

    int I2C_WriteData(char addr, char *array, int count)
    {
    int i;
    char *p,*in_p;
    static char input[2];

    p = array;
    in_p = input;

    //保证起始位及停止位的时序
    for(i=0; i<3200; i++);

    //进入复位，目的是清空I2CO_STR的标志位，不然有些标志位会一直占住I2C模块
    I2C0_MDR &= ~0x20;

    //先前是否发送完成 检查SST位是否为1
    if((I2C0_MDR & (0x01<<11)) == 1)
    {
    puts("previous not finished!");
    return 0;
    }

    //从机地址
    I2C0_SAR = addr;

    I2C0_STR |= (1<<12);

    //检查总线是否空闲 1：表示忙
    while((I2C0_STR & (1<<12)));

    //计数器
    I2C0_CNT = 2;

    //发送开启
    //进入复位 IRS = 0
    I2C0_MDR |= 0x6E60;

    //发送数据
    while(I2C0_STR & (0x01<<1)); //ASK
    while(!(I2C0_STR & (0x1<<4))); //ICXRDY
    I2C0_DXR = *p++;

    //获取得到的数据
    while(I2C0_STR & (0x01<<11))
    {
    *in_p++ = I2C0_DRR;
    }

    //发送数据
    while(I2C0_STR & (0x01<<1));
    while(!(I2C0_STR & (0x1<<4)));
    I2C0_DXR = *p++;

    //获取得到的数据
    while(I2C0_STR & (0x01<<11))
    {
    *in_p++ = I2C0_DRR;
    }

    //停止位时序，去掉的话没有停止位
    for(i=0; i<3000; i++);

    //获取得到的数据
    while(I2C0_STR & (0x01<<11))
    {
    *in_p++ = I2C0_DRR;
    }

    return p-array;
    }

    char I2C_ReadDirRegister(int DirId, int reg)
    {
    return 0;
    }

    void i2c0_int()
    {
    puts("received!");
    }