System Memory UART Protocol could not Read continuously

[TesterSAM]

Hi, 

I am testing the System Memory UART protocol in STM32G070CB.

I tried the Get command, the Go command, and the Read Memory command standalone, all success.

However, when I try to execute the Read Memory command, which is successful, and then execute the Read Memory command, the ST does not send any response.

Full pattern:

Successful Enter Boot Mode:

Read Memory CMD with Address = 0x0801FFF0 and read data size is 0x10

Try to execute the Read Memory CMD again but without ACK/NACK

As I know, the protocol is able to execute other CMD when the pervious CMD completed or Failed. 

How could I execute CMD continuously?

Note: UART Protocol version of the MCU is V3.1

[TDK · Accepted solution]

It may not like that you're reading at the very end of the flash. If so, it would be a bug.

Does it happen if you read from 0x08000000?

[TesterSAM]

Thank you @TDK 

Yes, the fail case is reading the last 16 Bytes of Data of the Image (128K Bytes Flash, start address: 0x08000000, read Address: 0x0801FFF0)

I reviewed the issue caused by the WRONG data size. I tried to read 16 Bytes of the last of the image, but I input 0x10 instead of 0x0F (N-1).

Now, it could execute other commands when the Read Memory command is completed.

[Andrew Neil]

So it's now all working?

If so, please mark the solution.

[TDK]

Makes sense. So you're actually reading 1 byte past the end of flash, which likely triggers a hard fault.