Target type is nrf52840 No ACK received

Hi,

I’m using the Agora board Agora Board. I’m trying to setup the Mbed Studio: 1.2.1 on debian 10, however I receive the error “PyOCD deploy failed, deploying using mass storage device on Agora Board”. Some info on the issue I have written on Mbed Studio

My System has the following setup:

gcc-arm-none-eabi-9-2019-q4-major
debian 10 
mbed 1.10.4
pyocd 0.28.1

I have been checking around trying to understand the error, and it seems that the pyocd cannot connect to my device. By executing pyocd list I receive:

0 ep_agora [nrf52840] 2600360253274e450012800df7c3002fd811000097969900

However when I’m using pyocd erase -t nrf52840 --chip or pyocd flash -t nrf52840 mbed-os-example-blinky.hex

I receive:

0000581:CRITICAL:__main__:No ACK received
Traceback (most recent call last):
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/cmsis_dap_probe.py", line 250, in read_dp
    result = self._link.read_reg(reg_id, now=now)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 839, in read_reg
    return read_reg_cb()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 833, in read_reg_cb
    res = transfer.get_result()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 143, in get_result
    self.daplink.flush()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/utility/concurrency.py", line 28, in _locking
    return func(self, *args, **kwargs)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 667, in flush
    self._read_packet()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/utility/concurrency.py", line 28, in _locking
    return func(self, *args, **kwargs)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 918, in _read_packet
    decoded_data = cmd.decode_data(raw_data)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 449, in decode_data
    data = self._decode_transfer_block_data(data)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 418, in _decode_transfer_block_data
    self._check_response(data[3])
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/pydapaccess/dap_access_cmsis_dap.py", line 341, in _check_response
    raise DAPAccessIntf.TransferError("No ACK received")
pyocd.probe.pydapaccess.dap_access_api.DAPAccessIntf.TransferError: No ACK received

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/__main__.py", line 398, in run
    self._COMMANDS[self._args.cmd](self)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/__main__.py", line 568, in do_flash
    with session:
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/core/session.py", line 343, in __enter__
    self.open()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/core/session.py", line 461, in open
    self._board.init()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/board/board.py", line 85, in init
    self.target.init()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/core/soc_target.py", line 120, in init
    seq.invoke()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/utility/sequencer.py", line 213, in invoke
    resultSequence.invoke()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/utility/sequencer.py", line 208, in invoke
    resultSequence = call()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/coresight/dap.py", line 303, in _connect
    connector.connect(self._protocol)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/coresight/dap.py", line 167, in connect
    self._idr = self.read_idr()
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/coresight/dap.py", line 194, in read_idr
    dpidr = self._probe.read_dp(DP_IDR, now=True)
  File "/home/symeon/.local/lib/python3.7/site-packages/pyocd/probe/cmsis_dap_probe.py", line 252, in read_dp
    six.raise_from(self._convert_exception(error), error)
  File "<string>", line 3, in raise_from
pyocd.core.exceptions.TransferError: No ACK received

Any suggestions?

[symeonmattes]

Hi @flit,

You said:

This most often means that the device is asleep. Please make sure you are using a debug build of your code that disables sleep.

To be honest I’m not sure what it means what you said. I done the following steps:

1. git clone [e-mail]:ARMmbed/mbed-os-example-blinky.git
2. mbed compile -m EP_AGORA -t GCC_ARM --flash This compiles the software and flashes it onto the board correctly…it led is blinking for some seconds and then stops
3. I just want to do debugging, i.e. from an IDE put a breakpoint and see what I have in the env variables.
4. I have tried diffferent IDEs with no success, and in all I have receiving that PYOCD No ACK received. That’s why I have tried to find why pyocd is as such.

I have tried the

You might try change to the under-reset connect mode by passing --connect=under-reset on the command line. This only works if the MCU has a hardware nRESET signal. It forces the device to wake by reset as pyOCD connects.

So I run

pyocd erase -t nrf52840 --chip --connect=under-reset
pyocd flash -t nrf52840 mbed-os-example-blinky.hex --connect=under-reset

But again I receive the same error.

Thanks

[symeonmattes]

Hi,

I have some more logs in case they are useful:

In https://github.com/pyocd/pyOCD/blob/master/udev/README.md. it says about some dev rules that could help although they are installed automatically by pyocd. I have run dmesg, as requested and when plug in the board I receive:

[ 4208.436839] usb 2-2: new full-speed USB device number 4 using xhci_hcd
[ 4208.591366] usb 2-2: New USB device found, idVendor=0d28, idProduct=0204, bcdDevice=10.00
[ 4208.591370] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4208.591373] usb 2-2: Product: DAPLink CMSIS-DAP
[ 4208.591375] usb 2-2: Manufacturer: ARM
[ 4208.591377] usb 2-2: SerialNumber: 2600360253274e450012800df7c3002fd811000097969900
[ 4208.593844] usb-storage 2-2:1.0: USB Mass Storage device detected
[ 4208.594181] scsi host3: usb-storage 2-2:1.0
[ 4208.594831] cdc_acm 2-2:1.1: ttyACM0: USB ACM device
[ 4208.598358] hid-generic 0003:0D28:0204.0003: hiddev0,hidraw0: USB HID v1.00 Device [ARM DAPLink CMSIS-DAP] on usb-0000:00:14.0-2/input3
[ 4209.613609] scsi 3:0:0:0: Direct-Access     MBED     VFS              0.1  PQ: 0 ANSI: 2
[ 4209.614268] sd 3:0:0:0: Attached scsi generic sg2 type 0
[ 4209.614425] sd 3:0:0:0: [sdb] 131200 512-byte logical blocks: (67.2 MB/64.1 MiB)
[ 4209.614598] sd 3:0:0:0: [sdb] Write Protect is off
[ 4209.614600] sd 3:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 4209.614766] sd 3:0:0:0: [sdb] No Caching mode page found
[ 4209.614771] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[ 4209.627580]  sdb:
[ 4209.628714] sd 3:0:0:0: [sdb] Attached SCSI removable disk

I checked a little bit the code of pyocd on the line that I receive the error of “No ACK received” and I receive the error on “~/.local/lib/python3.7/site-packages/pyocd/probe/cmsis_dap_probe.py”

    def read_dp(self, addr, now=True):
        reg_id = self.REG_ADDR_TO_ID_MAP[self.DP, addr] # it gives REG.DP_0x0
        try:
            result = self._link.read_reg(reg_id, now=now) # here is the error

It seems as if there is no communication with the board.