Why do I get ACI_STATUS_ERROR_INVALID_PARAMETER for every command I send?

Question

I am communicating with the nrf8001 via SPI, from an HCS08 MCU. First thing I receive: 
 0x01 0x04 0x81 0x02 0x00 0x02 
 This makes sense, it tells me it is in setup state. I want to put it into test state, specifically for testing the ACI. So, I transmit: 
 0x02 0x01 0x02 
 I get acknowledgements of 0x00, 0x01, 0x00 . Then, I receive: 
 0x01 0x03 0x84 0x01 0x85 
 According to the datasheet, this is an error, due to an invalid parameter. Okay, next I transmit an echo command: 
 0x04 0x02 0x47 0x48 0x49 
 I expect it to either tell me that it is in the wrong state, or, by some miracle, return the last three bytes. I receive: 
 0x01 0x03 0x84 0x01 0x85 
 Invalid Parameter. I have tried sending it various commands, even those with no parameters, such as the GetDeviceAddress ( 0x0A ) or GetTemperature ( 0x0C ). Yet, every time, I receive the same error: Invalid Parameter. 
 What could I be doing wrong?

David Edwin · Accepted Answer

You seem to have successfully received the Device Started Event stating that the device is in setup mode. However when you sent the Test command (0x01) , the command has failed. The failure is clear from the Command Response Event that is received for the Test command. 
 We need to understand why the test command failed. Can you send me the chip markings on top of the nRF8001 and the nRF8001 board that you are using. 
 Unexpected things noticed: 
 
 The nRF8001 is reponding with (0x01 0x03 0x84 0x01 0x85) to the echo command, and by looking at the SPI message received (command Response Event) the nRF8001 seems to think that the test command was sent. This would appear that no further commands are possible and only a pin RESET can be used to proceed and re-attempt the Test command again. 
 
 Actions requested (summary): 
 As @run_ar has suggested an SPI trace of the nRF8001 would be nice. 
 In addition mention the lines that you are using between the HS08 and the nRF8001 and
Mention the SPI clock speed that you have used 
 Chip markings on the nRF8001 and the nRF8001 board used.

Why do I get ACI_STATUS_ERROR_INVALID_PARAMETER for every command I send?

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