safeload
Thread Summary
The user inquired about the correct syntax for normal and safeload I2C messages to address 0x000A on the ADAU1701 DSP. The final answer clarified that the payload word for safeload should be 5 bytes, not 4, and provided a link to documentation for further details. Additional information on safeloading the ADAU1701 was also referenced.AI Generated Content
Hej
My understanding of normal I2C and safeload I2C message is described below as and example message sent to addres 0x000a in the DSP as normal and safe load operation.
Please inspect and tell me if I have understood the syntax correctly.
If we send data to DSP selecting the Audio ON/OFF Mode for a tone generator, we send to address 0x000A the bytes 0x00,0x80,0x00,0x00
That will in terms of DSP communication be:
Init I2C Communucation with address 0x0038h
Send the bytes:
0a 00 00 80 00 00
If we are to safeload this we:
Init I2C Communucation with address 0x0038h
Send the bytes:
06 00 09 00 02 00 00 80 00 00
06 00 being the 0x0006 safeload address
09 00 being the 0x000a - 1 cell address
02 00 being the payload size in words (4 bytes)
00 80 00 00 The 4 bytes (2 words) for address 0x000A when there is no activity
Is it correct understood?
Hello hjelveh,
The payload word needs to be 5 bytes, even though the parameter itself is only 4 bytes. For the reason why, see Implementing Safeload Writes on the ADAU1701
Best regards,
Bob
Hi once more,
More info on safeloading the ADAU1701 is at https://ez.analog.com/message/117262#117262
Bob
Thank you, Bob.
Please log in to reply.