Re: [Gumstix-users] i2c I/O Problem

[RussellMorin <rm...@wp...>]

Hi Dave,

That seems to be working correctly now. :) How do I tell I2C_IO_SetGPIODir
whether I want it to set the pin to input or output? From what you told me,
output works like this: I2C_IO_SetGPIODir(i2cDev, port, enmask, enmask), but
I can't figure out how to change the direction if I want to get input. 

Thanks again for all your help,
-Russ Morin


Dave Hylands wrote:
> 
> Hi Russel,
> 
>>        I2C_IO_SetGPIODir(i2cDev, port, enmask, 1); // Set the pin to
>> output
>>        I2C_IO_SetGPIO(i2cDev, port, enmask, 1);
> 
> I think that you need to use:
> 
>>        I2C_IO_SetGPIODir(i2cDev, port, enmask, enmask); // Set the pin to
>> output
>>        I2C_IO_SetGPIO(i2cDev, port, enmask, enmask);
> 
> And the same thing here. Replace the 1's with the mask.
> 
>>        // Set the direction of all the motor pins to output
>>        I2C_IO_SetGPIODir(i2cDev, port, m11mask, 1);
>>        I2C_IO_SetGPIODir(i2cDev, port, m12mask, 1);
>>        I2C_IO_SetGPIODir(i2cDev, port, m21mask, 1);
>>        I2C_IO_SetGPIODir(i2cDev, port, m22mask, 1);
> 
> You could actually do it all in a single call:
> 
>>        I2C_IO_SetGPIODir(i2cDev, port, m11mask | m12mask | m21mask |
>> m22mask, m11mask | m12mask | m21mask | m22mask);
> 
>>        uint8_t i = 0;
>>        while (i < 4)
>>        {
>>                uint8_t pinVal;
>>                I2C_IO_GetGPIO(i2cDev, port, &pinVal);
>>                printf("Pinval = %i\n", pinVal);
>>                i++;
>>        }
> 
> And the GetGPIO function returns all 8 pins for a single port, and you
> need to mask out the particular pin you're looking for.
> 
> -- 
> Dave Hylands
> Shuswap, BC, Canada
> http://www.DaveHylands.com/
> 
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