TRF7970A: Issues with reliable SPI communication, MSPM0G3507 and TRF7970A

James Guyton

Part Number: TRF7970A
Other Parts Discussed in Thread: MSPM0G3507,

Tool/software:

I've been able to successfully get the TRF7970A started up and can set the initial registers/read all of the expected values, but I seem to be having troubles when attempting to read RFIDs, where the bytes received on the MSPM0G3507 does not appear to always match what is seen on a logic analyzer - in particular when trying to check for an external RF field - I keep getting values back in the 0x0F read where the oscillator bit is not set, and some where it is indicating an RF field where one should not be present. I'm trying to find examples of the mismatches, but I'll have to poke around a bit more to get screenshots of those.

Initial setup/response:

TX:83
RX:00
TX:80
RX:00
TX:8F
RX:00
TX:40
TX:80
RX:00
RX:01
TRF79XXA_CHIP_STATUS_CONTROL (0x00): 01
TX:41
TX:80
RX:00
RX:21
TRF79XXA_ISO_CONTROL (0x01): 21
TX:42
TX:80
RX:00
RX:00
TRF79XXA_ISO14443B_TX_OPTIONS (0x02): 00
TX:43
TX:80
RX:00
RX:00
TRF79XXA_ISO14443A_BITRATE_OPTIONS (0x03): 00
TX:44
TX:80
RX:00
RX:C1
TRF79XXA_TX_TIMER_EPC_HIGH (0x04): C1
TX:45
TX:80
RX:FF
RX:C1
TRF79XXA_TX_TIMER_EPC_LOW (0x05): C1
TX:46
TX:80
RX:FF
RX:00
TRF79XXA_TX_PULSE_LENGTH_CONTROL (0x06): 00
TX:47
TX:80
RX:00
RX:0E
TRF79XXA_RX_NO_RESPONSE_WAIT_TIME (0x07): 0E
TX:48
TX:80
RX:00
RX:07
TRF79XXA_RX_WAIT_TIME (0x08): 07
TX:49
TX:80
RX:00
RX:91
TRF79XXA_MODULATOR_CONTROL (0x09): 91
TX:4A
TX:80
RX:00
RX:10
TRF79XXA_RX_SPECIAL_SETTINGS (0x0A): 10
TX:4B
TX:80
RX:00
RX:87
TRF79XXA_REGULATOR_CONTROL (0x0B): 87
TX:4C
TX:80
RX:00
RX:00
TRF79XXA_IRQ_STATUS (0x0C): 00
TX:4D
TX:80
RX:00
RX:3E
TRF79XXA_IRQ_MASK (0x0D): 3E
TX:4E
TX:80
RX:00
RX:00
TRF79XXA_COLLISION_POSITION (0x0E): 00
TX:4F
TX:80
RX:00
RX:40
TRF79XXA_RSSI_LEVELS (0x0F): 40
TX:50
TX:80
RX:FF
RX:00
TRF79XXA_SPECIAL_FUNCTION_1 (0x10): 00
TX:09
TX:01
TX:0B
TX:01
TX:18
TX:00
TX:40
TX:80
RX:00
RX:00
TRF79XXA_CHIP_STATUS_CONTROL (0x00): 00
TX:41
TX:80
RX:00
RX:00
TRF79XXA_ISO_CONTROL (0x01): 00
TX:42
TX:80
RX:00
RX:21
TRF79XXA_ISO14443B_TX_OPTIONS (0x02): 21
TX:43
TX:80
RX:00
RX:00
TRF79XXA_ISO14443A_BITRATE_OPTIONS (0x03): 00
TX:44
TX:80
RX:00
RX:00
TRF79XXA_TX_TIMER_EPC_HIGH (0x04): 00
TX:45
TX:80
RX:00
RX:C1
TRF79XXA_TX_TIMER_EPC_LOW (0x05): C1
TX:46
TX:80
RX:FF
RX:C1
TRF79XXA_TX_PULSE_LENGTH_CONTROL (0x06): C1
TX:47
TX:80
RX:FF
RX:00
TRF79XXA_RX_NO_RESPONSE_WAIT_TIME (0x07): 00
TX:48
TX:80
RX:00
RX:0E
TRF79XXA_RX_WAIT_TIME (0x08): 0E
TX:49
TX:80
RX:00
RX:07
TRF79XXA_MODULATOR_CONTROL (0x09): 07
TX:4A
TX:80
RX:00
RX:01
TRF79XXA_RX_SPECIAL_SETTINGS (0x0A): 01
TX:4B
TX:80
RX:00
RX:10
TRF79XXA_REGULATOR_CONTROL (0x0B): 10
TX:4C
TX:80
RX:00
RX:01
TRF79XXA_IRQ_STATUS (0x0C): 01
TX:4D
TX:80
RX:00
RX:00
TRF79XXA_IRQ_MASK (0x0D): 00
TX:4E
TX:80
RX:00
RX:3E
TRF79XXA_COLLISION_POSITION (0x0E): 3E
TX:4F
TX:80
RX:00
RX:00
TRF79XXA_RSSI_LEVELS (0x0F): 00
TX:50
TX:80
RX:00
RX:40
TRF79XXA_SPECIAL_FUNCTION_1 (0x10): 40
Booted! Addr: 00

I've tried to verify the signals themselves against the timing diagram from the datasheet:

Looking at t_ste_lead, clock and duty cycle, lag time, and CS pulse duration between operations - they appear to be within the timing constraints - the connections to ground are rather long in the test setup, however. (CH4: CS, CH3:CLK, CH2: MOSI CH1: MISO)

SPI setup (1MHz):

26 days ago

0 James Guyton 26 days ago

Prodigy 100 points

Code is based off of the

TRF7970ABP RFID Reader Demo

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<!-- h2>Manifest Table</h2 -->

 
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 <tbody> 
 
 <h2> 
  TRF7970ABP RFID Reader Demo Manifest Table 
 </h2> 
 
  
 <p> 
 
 See the Legend above for a description of these columns. 
 
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 <table id="targetpackages" name="targetpackages"> 
 <thead>  
 	<tr> 
 		<td><b>Software Name</b></td> 
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 		<td><b>License Type</b></td> 
 		<td><b>Delivered As</b></td> 
 		<td><b>Modified by TI</b></td> 
 		<td></td> 
 		<td></td> 
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 </thead>  
 
 
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 		<td id="name" name="name" rowspan="2"> 
 TRF7970ABP_RFID_Reader_Demo 
 </td> 
 		<td id="version" name="version" rowspan="2"> 
 3.01 
 </td> 
 		<td id="license" name="license" rowspan="2"> 
 BSD 
 </td> 
 		<td id="delivered" name="delivered" rowspan="2"> 
 Source 
 </td> 
 		<td id="modified" name="modified" rowspan="2"> 
 N/A 
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 {As Installed} 
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 Texas Instruments Incorporated 
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<BR><h3><b> TRF7970ABP RFID Reader Demo Licenses </b></h3><BR> <BR><BR>/*<BR> * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ <BR> * <BR> * <BR> *  Redistribution and use in source and binary forms, with or without <BR> *  modification, are permitted provided that the following conditions <BR> *  are met:<BR> *<BR> *    Redistributions of source code must retain the above copyright <BR> *    notice, this list of conditions and the following disclaimer.<BR> *<BR> *    Redistributions in binary form must reproduce the above copyright<BR> *    notice, this list of conditions and the following disclaimer in the <BR> *    documentation and/or other materials provided with the   <BR> *    distribution.<BR> *<BR> *    Neither the name of Texas Instruments Incorporated nor the names of<BR> *    its contributors may be used to endorse or promote products derived<BR> *    from this software without specific prior written permission.<BR> *<BR> *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS <BR> *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT <BR> *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR<BR> *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT <BR> *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, <BR> *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT <BR> *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,<BR> *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY<BR> *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT <BR> *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE <BR> *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.<BR> *<BR>*/<BR><BR>

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0 James Guyton 26 days ago

Prodigy 100 points

Noting that in the above, the 0x0F register read shows 0x00 - would expect this to be 0x40 (or something with that bit active). Going to try to set up a polling to wait for that bit to be active (OSC stabile) before finishing the init.

0 James Guyton 26 days ago in reply to James Guyton

Prodigy 100 points

Polling for this to become active works - but later the bit seems to disappear.

Right now, putting this as likely a software issue where read bytes are not getting discarded/handled properly when performing transmits - can see in logs that there is often a stream of TX bytes without corresponding RX - which would mean that the FIFO buffer would be filling up.

0 Charles Tsai 25 days ago in reply to James Guyton

TI__Guru**** 191886 points

Hi James,

Sorry for the late reply as yesterday was a public US holiday.

Can you reset the FIFO after receiving data? Let me know if this makes a difference.

0 James Guyton 24 days ago in reply to Charles Tsai

Prodigy 100 points

Hi Charles, no worries - I'm bouncing between this on one board, and some TPS6522053 issues on another board.
To be clear - this would be issuing the FIFO clear to the TRF7970A, after getting every read? Or just reading the RSSI values?

Thanks,

James

0 Charles Tsai 24 days ago in reply to James Guyton

TI__Guru**** 191886 points

Hi James,

I took a snippet of the SPI transactions between the MCU and the TRF. Please look at the places where Reset FIFO is issued.

	Direct Command		Reset FIFO (0x0F)
	Direct Command		Transmission with CRC (0x11)
Continuous	Write Register
	Data	0x00	TX Length 1 (0x1D)
	Data	0x20	TX Length 2 (0x1E)
	Data	0x02	FIFO I/O (0x1F)
	Data	0x2B	FIFO I/O (0x1F)
Single	Read Register
	Data	0x80	IRQ Status (0x0C)
	Direct Command		Reset FIFO (0x0F)
Single	Read Register
	Data	0x40	IRQ Status (0x0C)
Single	Read Register
	Data	0x77	RSSI Levels and Oscillator Status (0x0F)
Single	Read Register
	Data	0x0F	FIFO Status (0x1C)
Continuous	Read Register
	Data	0x00	FIFO I/O (0x1F)
	Data	0x0F	FIFO I/O (0x1F)
	Data	0xD4	FIFO I/O (0x1F)
	Data	0x33	FIFO I/O (0x1F)
	Data	0xDC	FIFO I/O (0x1F)
	Data	0x1D	FIFO I/O (0x1F)
	Data	0x00	FIFO I/O (0x1F)
	Data	0x00	FIFO I/O (0x1F)
	Data	0x07	FIFO I/O (0x1F)
	Data	0xE0	FIFO I/O (0x1F)
	Data	0x00	FIFO I/O (0x1F)
	Data	0x00	FIFO I/O (0x1F)
	Data	0x3F	FIFO I/O (0x1F)
	Data	0x03	FIFO I/O (0x1F)
	Data	0x8B	FIFO I/O (0x1F)
	Direct Command		Reset FIFO (0x0F)
	Direct Command		Transmission with CRC (0x11)

0 James Guyton 19 days ago in reply to Charles Tsai

Prodigy 100 points

I've had a chance to look a bit more into this - it looks like I had/have an issue with alignment of data on my end (where the MSPM0G3507 RX FIFO was not getting cleared correctly on some transmits). This hasn't completely eliminated all the comms issues, but this looks like it is going to be a matter of persistence and comparison with logic analyzer recordings to go further.

Other wireless

Other wireless technologies forum

TRF7970A: Issues with reliable SPI communication, MSPM0G3507 and TRF7970A