I would like to give some more information:
I modified IOIOSimpleApp and kept the configuration the same in
AndroidManifest.xml and I am running app on the android phone in
OpenAccessory mode connected to ioio-otg with usb cable.
Do I need to change anything to AndroidManifest.xml (such as adding
permission for usb) ?
On Thursday, February 11, 2016 at 10:25:54 AM UTC+1, Lumi wrote:
>
> Hi Ytai,
>
> You are right, I can do it in one writeRead() call. As I did below:
>
> byte[] request=new byte[]{0x01}; //data that I want to write
> byte[] response = new byte[1];
>
>
> In setup()( function:
>
>
> i2c=ioio_.openTwiMaster(2, TwiMaster.Rate.RATE_100KHz, false);
>
>
> In loop() function:
>
>
> if(i2c.writeRead(0x63, false, request, request.length, response,
> response.length)) //This call returns true
> {
> pw.print(String.format("%02X", response[0]));
> pw.print(" ");
> }
>
>
> However, my problem still remains. The data (0x01) in request interpreted
> as starting address of read. Therefore, I read the default data in the
> register which has the address 0x01. However, I would like to write 0x01 as
> (data) into the first register of device and read it back.
>
> What might am I doing wrong ? Is there a way to log/dump writeRead() call ?
>
> Thank you in advance.
> Regards,
>
>
> On Wednesday, February 10, 2016 at 4:23:30 PM UTC+1, Ytai wrote:
>>
>> Why are you separating this into two transactions? It is very uncommon.
>> On Feb 10, 2016 5:09 AM, "Lumi" <[email protected]> wrote:
>>
>>> Hello
>>>
>>> I found a figure (attached) explaining how the communication should take
>>> place, I believe this helps to clarify the issue.
>>>
>>> Thanks.
>>>
>>> On Wednesday, February 10, 2016 at 12:33:25 PM UTC+1, Lumi wrote:
>>>>
>>>> Dear all,
>>>>
>>>> I am trying to talk with an external device via ioio-otg twi ports. I
>>>> would like to write and read data to/from the registers of my external
>>>> device.
>>>>
>>>> Here are samples from my code:
>>>>
>>>> byte[] request=new byte[]{0x01}; //data that I want to write
>>>> byte[] response = new byte[13];
>>>>
>>>>
>>>> In setup()( function:
>>>>
>>>>
>>>> i2c=ioio_.openTwiMaster(2, TwiMaster.Rate.RATE_100KHz, false);
>>>>
>>>>
>>>> In loop() function:
>>>>
>>>>
>>>> if(i2c.writeRead(0x63, false, request, request.length, null, 0)) { //Here,
>>>> I only want to write
>>>>
>>>> if (i2c.writeRead(0x63, false, null, 0, response, response.length))//
>>>> Here, I only want to read
>>>> {
>>>> for (int i = 0; i < 13; i++) {
>>>> pw.print(String.format("%02X", response[i]));
>>>> pw.print(" ");
>>>> }
>>>>
>>>> }
>>>>
>>>>
>>>> Both writeRead() functions return true.
>>>>
>>>> However, the data 0x01 in request array is interpreted as an internal
>>>> address of a register in the device. I could not get 0x01 interpreted as
>>>> data and written into external device register.
>>>>
>>>>
>>>> This may not be very clear, but maybe there are some people who can
>>>> already spot the problem.
>>>>
>>>>
>>>> Thank you in advance,
>>>>
>>>> Regards.
>>>>
>>>>
>>>>
>>> On Wednesday, February 10, 2016 at 12:33:25 PM UTC+1, Lumi wrote:
>>>>
>>>> Dear all,
>>>>
>>>> I am trying to talk with an external device via ioio-otg twi ports. I
>>>> would like to write and read data to/from the registers of my external
>>>> device.
>>>>
>>>> Here are samples from my code:
>>>>
>>>> byte[] request=new byte[]{0x01}; //data that I want to write
>>>> byte[] response = new byte[13];
>>>>
>>>>
>>>> In setup()( function:
>>>>
>>>>
>>>> i2c=ioio_.openTwiMaster(2, TwiMaster.Rate.RATE_100KHz, false);
>>>>
>>>>
>>>> In loop() function:
>>>>
>>>>
>>>> if(i2c.writeRead(0x63, false, request, request.length, null, 0)) { //Here,
>>>> I only want to write
>>>>
>>>> if (i2c.writeRead(0x63, false, null, 0, response, response.length))//
>>>> Here, I only want to read
>>>> {
>>>> for (int i = 0; i < 13; i++) {
>>>> pw.print(String.format("%02X", response[i]));
>>>> pw.print(" ");
>>>> }
>>>>
>>>> }
>>>>
>>>>
>>>> Both writeRead() functions return true.
>>>>
>>>> However, the data 0x01 in request array is interpreted as an internal
>>>> address of a register in the device. I could not get 0x01 interpreted as
>>>> data and written into external device register.
>>>>
>>>>
>>>> This may not be very clear, but maybe there are some people who can
>>>> already spot the problem.
>>>>
>>>>
>>>> Thank you in advance,
>>>>
>>>> Regards.
>>>>
>>>>
>>>> --
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>>
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