AWR2944: "BUFF_OVF" error occurs when writing ADCBUF using DMM

gaoyang

Part Number: AWR2944

I am trying to write data to ADCBUF via DMM, below are my writing steps：
1. reset DMM_B
*(volatile uint32_t *)0x03F79E00U = 0x00010000U;
*(volatile uint32_t *)0x03F79E00U = 0x00000000U;
2. DMM_B Pins set(8pin)
*(volatile uint32_t *)0x03F79E6CU = 0x000403FFU;
*(volatile uint32_t *)0x03F79E8CU = 0x000403FEU;
3. DMM_B Direct Data Mode, debug mode, CONTCLK, DDM_WIDTH(32bit)
*(volatile uint32_t *)0x03F79E00U = 0x0006050AU;
4. DMM_B Destination ADCBUF(0xA4000000), 32KB
*(volatile uint32_t *)0x03F79E1CU = 0xA4000000U;
*(volatile uint32_t *)0x03F79E20U = 0x0000000BU;
5. Write 3072byte data using fpga

Then I read ADCBUF (0xA5000000) in CCS, and the actual written data length is 258H, INTFLAG.BUFF_OVF flag is set. Are my configuration steps wrong?

over 1 year ago

0 Saswat Kumar over 1 year ago

TI__Mastermind 36015 points

Hello Gaoyang,

When you are writing the same data to L3 instead I assume that it is working correctly? If it is working correctly, then follow the below steps:

So, for ADCBUFF there is a separate sequence to write as you cannot directly write to ADCBUFF via the DMM.
The ADCBUFFER has both ping and pong memory (You can read up more about this in the TRM).
For this you will have to write the register: 0x050202D0 b[17:16]

When you want to write to the ping memory b[17:16] = 10 and pong memory b[17:16] = 11

So, this register has to be written before writing the ADC data.

Regards,
Saswat Kumar

0 gaoyang over 1 year ago in reply to Saswat Kumar

Prodigy 20 points

before i reset DMM_B(step 1), I have completed the write operation of ping/pong。
I divided the 3072-byte data into 6 data packets, and added a 20us delay when sending each data packet. In this way, all the data can be written correctly.

0 Saswat Kumar over 1 year ago in reply to gaoyang

TI__Mastermind 36015 points

Hello gaoyang,

So without the above sequence also is your ADCBUFF getting written now?

Regards,
Saswat Kumar

0 gaoyang over 1 year ago in reply to Saswat Kumar

Prodigy 20 points

If the 20us delay is not added to the write operation, ADCBUF can only write 600 bytes of data.

0 Saswat Kumar over 1 year ago in reply to gaoyang

TI__Mastermind 36015 points

Hello Gaoyang,

Okay good to know that it is working for you now.
As it is working I am closing this ticket.

Regards,
Saswat Kumar

Sensors

Sensors forum

AWR2944: "BUFF_OVF" error occurs when writing ADCBUF using DMM