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] <javascript:>> 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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