关于am335x i2c管脚配置的问题

忘了说了，我没有采用操作系统，我是用的裸跑的模式

 你好，

没有什么特殊的设置，你是否可以贴出来你的相关代码。你是否有尝试过初始化其他control module，比如串口等等，是否有类似问题，

另外你的代码有参考过starterware的I2C例程么？

我们starterware里面pinmux配置函数是没有问题的，而且这2个管脚默认就是I2C数据线和时钟线啊

代码

int main(void)
{

I2C0ModuleClkConfig();
I2CPinMuxSetup(0);

其中这两个函数为 

void I2CPinMuxSetup(unsigned int instance)
{
int sda_tmp,sdl_tmp,i2c_pinmux;
i2c_pinmux = ~CONTROL_CONF_MUXMODE(7);
sda_tmp = HWREG(SOC_CONTROL_REGS + CONTROL_CONF_I2C0_SDA);
sdl_tmp = HWREG(SOC_CONTROL_REGS + CONTROL_CONF_I2C0_SCL);
printf(" The origion sda value is %d\n",sda_tmp);
printf(" The origion sdl value is %d\n",sdl_tmp);
if(instance == 0)
{
HWREG(SOC_CONTROL_REGS + CONTROL_CONF_I2C0_SDA) =
(CONTROL_CONF_I2C0_SDA_CONF_I2C0_SDA_RXACTIVE |
CONTROL_CONF_I2C0_SDA_CONF_I2C0_SDA_SLEWCTRL |
CONTROL_CONF_I2C0_SDA_CONF_I2C0_SDA_PUTYPESEL & i2c_pinmux );

HWREG(SOC_CONTROL_REGS + CONTROL_CONF_I2C0_SCL) =
(CONTROL_CONF_I2C0_SCL_CONF_I2C0_SCL_RXACTIVE |
CONTROL_CONF_I2C0_SCL_CONF_I2C0_SCL_SLEWCTRL |
CONTROL_CONF_I2C0_SCL_CONF_I2C0_SCL_PUTYPESEL & i2c_pinmux);
printf(" The modified sda value is %d\n",sda_tmp);
printf(" The modified sdl value is %d\n",sdl_tmp);

}
else if(instance == 1)
{
/* I2C_SCLK */
HWREG(SOC_CONTROL_REGS + CONTROL_CONF_SPI0_D1) =
(CONTROL_CONF_SPI0_D1_CONF_SPI0_D1_PUTYPESEL |
CONTROL_CONF_SPI0_D1_CONF_SPI0_D1_RXACTIVE |
CONTROL_CONF_SPI0_D1_CONF_SPI0_D1_SLEWCTRL |
CONTROL_CONF_MUXMODE(2));
/* I2C_SDA */
HWREG(SOC_CONTROL_REGS + CONTROL_CONF_SPI0_CS0) =
(CONTROL_CONF_SPI0_CS0_CONF_SPI0_CS0_PUTYPESEL |
CONTROL_CONF_SPI0_CS0_CONF_SPI0_CS0_RXACTIVE |
CONTROL_CONF_SPI0_D1_CONF_SPI0_D1_SLEWCTRL |
CONTROL_CONF_MUXMODE(2));
}

}

/**
* \brief This function will configure the required clocks for I2C1 instance.
*
* \return None.
*
*/

/*
** This function enables the system L3 and system L4_WKUP clocks.
** This also enables the clocks for I2C0 instance.
*/

void I2C0ModuleClkConfig(void)
{
/* Configuring L3 Interface Clocks. */

/* Writing to MODULEMODE field of CM_PER_L3_CLKCTRL register. */
HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKCTRL) |=
CM_PER_L3_CLKCTRL_MODULEMODE_ENABLE;

/* Waiting for MODULEMODE field to reflect the written value. */
while(CM_PER_L3_CLKCTRL_MODULEMODE_ENABLE !=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKCTRL) &
CM_PER_L3_CLKCTRL_MODULEMODE));

/* Writing to MODULEMODE field of CM_PER_L3_INSTR_CLKCTRL register. */
HWREG(SOC_CM_PER_REGS + CM_PER_L3_INSTR_CLKCTRL) |=
CM_PER_L3_INSTR_CLKCTRL_MODULEMODE_ENABLE;

/* Waiting for MODULEMODE field to reflect the written value. */
while(CM_PER_L3_INSTR_CLKCTRL_MODULEMODE_ENABLE !=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3_INSTR_CLKCTRL) &
CM_PER_L3_INSTR_CLKCTRL_MODULEMODE));

/* Writing to CLKTRCTRL field of CM_PER_L3_CLKSTCTRL register. */
HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) |=
CM_PER_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

/* Waiting for CLKTRCTRL field to reflect the written value. */
while(CM_PER_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP !=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) &
CM_PER_L3_CLKSTCTRL_CLKTRCTRL));

/* Writing to CLKTRCTRL field of CM_PER_OCPWP_L3_CLKSTCTRL register. */
HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) |=
CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

/*Waiting for CLKTRCTRL field to reflect the written value. */
while(CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP !=
(HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) &
CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL));

/* Writing to CLKTRCTRL field of CM_PER_L3S_CLKSTCTRL register. */
HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) |=
CM_PER_L3S_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

/*Waiting for CLKTRCTRL field to reflect the written value. */
while(CM_PER_L3S_CLKSTCTRL_CLKTRCTRL_SW_WKUP !=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) &
CM_PER_L3S_CLKSTCTRL_CLKTRCTRL));

/* Checking fields for necessary values. */

/* Waiting for IDLEST field in CM_PER_L3_CLKCTRL register to be set to 0x0. */
while((CM_PER_L3_CLKCTRL_IDLEST_FUNC << CM_PER_L3_CLKCTRL_IDLEST_SHIFT)!=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKCTRL) &
CM_PER_L3_CLKCTRL_IDLEST));

/*
** Waiting for IDLEST field in CM_PER_L3_INSTR_CLKCTRL register to attain the
** desired value.
*/
while((CM_PER_L3_INSTR_CLKCTRL_IDLEST_FUNC <<
CM_PER_L3_INSTR_CLKCTRL_IDLEST_SHIFT)!=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3_INSTR_CLKCTRL) &
CM_PER_L3_INSTR_CLKCTRL_IDLEST));

/*
** Waiting for CLKACTIVITY_L3_GCLK field in CM_PER_L3_CLKSTCTRL register to
** attain the desired value.
*/
while(CM_PER_L3_CLKSTCTRL_CLKACTIVITY_L3_GCLK !=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) &
CM_PER_L3_CLKSTCTRL_CLKACTIVITY_L3_GCLK));

/*
** Waiting for CLKACTIVITY_OCPWP_L3_GCLK field in CM_PER_OCPWP_L3_CLKSTCTRL
** register to attain the desired value.
*/
while(CM_PER_OCPWP_L3_CLKSTCTRL_CLKACTIVITY_OCPWP_L3_GCLK !=
(HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) &
CM_PER_OCPWP_L3_CLKSTCTRL_CLKACTIVITY_OCPWP_L3_GCLK));

/*
** Waiting for CLKACTIVITY_L3S_GCLK field in CM_PER_L3S_CLKSTCTRL register
** to attain the desired value.
*/
while(CM_PER_L3S_CLKSTCTRL_CLKACTIVITY_L3S_GCLK !=
(HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) &
CM_PER_L3S_CLKSTCTRL_CLKACTIVITY_L3S_GCLK));

/* Configuring registers related to Wake-Up region. */

/* Writing to MODULEMODE field of CM_WKUP_CONTROL_CLKCTRL register. */
HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CONTROL_CLKCTRL) |=
CM_WKUP_CONTROL_CLKCTRL_MODULEMODE_ENABLE;

/* Waiting for MODULEMODE field to reflect the written value. */
while(CM_WKUP_CONTROL_CLKCTRL_MODULEMODE_ENABLE !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CONTROL_CLKCTRL) &
CM_WKUP_CONTROL_CLKCTRL_MODULEMODE));

/* Writing to CLKTRCTRL field of CM_PER_L3S_CLKSTCTRL register. */
HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CLKSTCTRL) |=
CM_WKUP_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

/*Waiting for CLKTRCTRL field to reflect the written value. */
while(CM_WKUP_CLKSTCTRL_CLKTRCTRL_SW_WKUP !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CLKSTCTRL) &
CM_WKUP_CLKSTCTRL_CLKTRCTRL));

/* Writing to CLKTRCTRL field of CM_L3_AON_CLKSTCTRL register. */
HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CM_L3_AON_CLKSTCTRL) |=
CM_WKUP_CM_L3_AON_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

/*Waiting for CLKTRCTRL field to reflect the written value. */
while(CM_WKUP_CM_L3_AON_CLKSTCTRL_CLKTRCTRL_SW_WKUP !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CM_L3_AON_CLKSTCTRL) &
CM_WKUP_CM_L3_AON_CLKSTCTRL_CLKTRCTRL));

/* Writing to MODULEMODE field of CM_WKUP_I2C0_CLKCTRL register. */
HWREG(SOC_CM_WKUP_REGS + CM_WKUP_I2C0_CLKCTRL) |=
CM_WKUP_I2C0_CLKCTRL_MODULEMODE_ENABLE;

/* Waiting for MODULEMODE field to reflect the written value. */
while(CM_WKUP_I2C0_CLKCTRL_MODULEMODE_ENABLE !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_I2C0_CLKCTRL) &
CM_WKUP_I2C0_CLKCTRL_MODULEMODE));

/* Verifying if the other bits are set to required settings. */

/*
** Waiting for IDLEST field in CM_WKUP_CONTROL_CLKCTRL register to attain
** desired value.
*/
while((CM_WKUP_CONTROL_CLKCTRL_IDLEST_FUNC <<
CM_WKUP_CONTROL_CLKCTRL_IDLEST_SHIFT) !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CONTROL_CLKCTRL) &
CM_WKUP_CONTROL_CLKCTRL_IDLEST));

/*
** Waiting for CLKACTIVITY_L3_AON_GCLK field in CM_L3_AON_CLKSTCTRL
** register to attain desired value.
*/
while(CM_WKUP_CM_L3_AON_CLKSTCTRL_CLKACTIVITY_L3_AON_GCLK !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CM_L3_AON_CLKSTCTRL) &
CM_WKUP_CM_L3_AON_CLKSTCTRL_CLKACTIVITY_L3_AON_GCLK));

/*
** Waiting for IDLEST field in CM_WKUP_L4WKUP_CLKCTRL register to attain
** desired value.
*/
while((CM_WKUP_L4WKUP_CLKCTRL_IDLEST_FUNC <<
CM_WKUP_L4WKUP_CLKCTRL_IDLEST_SHIFT) !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_L4WKUP_CLKCTRL) &
CM_WKUP_L4WKUP_CLKCTRL_IDLEST));

/*
** Waiting for CLKACTIVITY_L4_WKUP_GCLK field in CM_WKUP_CLKSTCTRL register
** to attain desired value.
*/
while(CM_WKUP_CLKSTCTRL_CLKACTIVITY_L4_WKUP_GCLK !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CLKSTCTRL) &
CM_WKUP_CLKSTCTRL_CLKACTIVITY_L4_WKUP_GCLK));

/*
** Waiting for CLKACTIVITY_L4_WKUP_AON_GCLK field in CM_L4_WKUP_AON_CLKSTCTRL
** register to attain desired value.
*/
while(CM_WKUP_CM_L4_WKUP_AON_CLKSTCTRL_CLKACTIVITY_L4_WKUP_AON_GCLK !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CM_L4_WKUP_AON_CLKSTCTRL) &
CM_WKUP_CM_L4_WKUP_AON_CLKSTCTRL_CLKACTIVITY_L4_WKUP_AON_GCLK));

/*
** Waiting for CLKACTIVITY_I2C0_GFCLK field in CM_WKUP_CLKSTCTRL
** register to attain desired value.
*/
while(CM_WKUP_CLKSTCTRL_CLKACTIVITY_I2C0_GFCLK !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_CLKSTCTRL) &
CM_WKUP_CLKSTCTRL_CLKACTIVITY_I2C0_GFCLK));

/*
** Waiting for IDLEST field in CM_WKUP_I2C0_CLKCTRL register to attain
** desired value.
*/
while((CM_WKUP_I2C0_CLKCTRL_IDLEST_FUNC <<
CM_WKUP_I2C0_CLKCTRL_IDLEST_SHIFT) !=
(HWREG(SOC_CM_WKUP_REGS + CM_WKUP_I2C0_CLKCTRL) &
CM_WKUP_I2C0_CLKCTRL_IDLEST));
}

打印语句打印的结果是

The origion sda value is 55
The origion sdl value is 55
The modified sda value is 55
The modified sdl value is 55

请问是不是在进行pinmux之前还需要进行什么操作而我不知道？

 你好，

如果这样，你的arm运行权限设置对么？