. . . I'm quite sure I'm running the Firmware I compiled. In one build I
verified that I can generate 1MHz signal using the Rate_1MHz setting (BRG
values{ 0x063D, 0x25, 0x0D }). I then I updated the firmware for the 3rd
BRG element ({ 0x063D, 0x25, 0x063D }) and received about 100KHz when
setting Rate to Rate_1MHz again.
I first compiled everything in the firmware using MPLAB X and XC16.
Secondly, I used "tools/make-ioio-bundle firmware/app_layer_v1/dist/
I2C_FirmWare.ioioapp IOIO0030" to create the bundle to download.
And finally I used "../IOIODude-0100/ioiodude --port=/dev/ttyACM0 --reset
write I2C_FirmWare.ioioapp" to download the firmware to the IOIO board.
This wrote to the device since there was Fingerprint mismatch.
The Firmware I used was pulled from ioio-master. I modified the IOIO Simple
APP under IOIO400 to test the changes. I added the twi commands to the
button switch of which I could see output on the I2C lines with my
oscilloscope and verify the clock rates.
I also noticed that my bluetooth dongle no longer flashed on, so I had to
wire directly to my cellphone.
On Thursday, March 13, 2014 1:26:40 PM UTC-7, Rich wrote:
>
> May have replied directly with my reply and didn't post properly . . .
> please re-post question here if you got it, else I'll put it back up.
> Thanks.
>
> On Thursday, March 13, 2014 8:43:39 AM UTC-7, Ytai wrote:
>>
>> This seems the right place to change. Are you sure you are actually
>> running the firmware that you've modified? How did you install it on the
>> IOIO?
>>
>>
>> On Wed, Mar 12, 2014 at 8:06 PM, Rich <[email protected]> wrote:
>>
>>> Hello,
>>>
>>> I was wondering, has anyone (users and/or the IOIO inventor)
>>> experimented with modifying the I2C clock rates below and beyond the
>>> currently supported rates (100KHz, 400kHz, 1MHz)?
>>>
>>> I have a device that can only run at 10KHz . . . I updated line 129 in
>>> the i2c.c IOIO firmware source (static const unsigned int brg_values[] = {
>>> 0x063D, 0x25, 0x0D }; //first element updated from 0x9D for 10KHz),
>>> compiled and downloaded the firmware. Using the correct enum RATE value, I
>>> received about 100KHz on my oscilloscope showing the incorrect clock rate
>>> not the new 10KHz. I also built another firmware version updating all of
>>> the brg_values to 0x063D to ensure that the changes were being passed
>>> properly and I confirmed that when I set the TWI rate to 1MHz for instance,
>>> I also receive 100KHz.
>>>
>>> Does the internal clock runs at 32 MHz? Any possible issues with
>>> modifying these values? I don't see anything in the PIC24 datasheet showing
>>> that I am limited to these three clock rates. Can anyone confirm?
>>>
>>>
>>> Thanks for your help and assistance.
>>>
>>> Best,
>>> Rich
>>>
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>>
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