Device Version and Compatibility Testing

This procedure is to be used for verifying a part for software compatibility and version identification. The procedure can be used both externally by reading through SWD or by on-board software by reading memory mapped locations. The physical addressing of the data location depends on which of these methods are chosen but yields the same data. When DEVICEID is read use SYS0:DEVICEID when running on-board software or CFGAP:DEVICEID over SWD. When PARTID is read, use SYS0:PARTID when running on-board software or CFGAP:PARTID over SWD.

All fields shall be parsed as unsigned binary coded integers.

To use SWD please refer to the CC23xx techincal reference manual.

Reading SYS0 Register CCS

Code Composer Studio provides an interface to read registers from CC23xx.

  1. Start a debug session with the CC23xx.

  2. Click on View → Registers.

Reading SYS0 Register HWREG() Macro

HWREG() may be used to read internal registers using their base addresses. Base addresses for various registers may be found in the CC23xx technical reference manual. If using this macro, please be aware of any limitations to the address accessed i.e. if it supports word and/or byte access.

Listing 28. HWREG() Example
1// Read example
2my32BitVar = HWREG(base_addr + offset) ;
3
4// Write example
5HWREG(base_addr + offset) = my32BitVar ;

The base address for the SYS0 register is 0x40004000. The offset for DEVICEID is 0x3FC and PARTID is 0x7F8. Please see the CC23xx technical reference manual for more information.

Process

First, establish that the device is a CC23xx family device by reading the manufacturer identifier. If running on-board software, this is assumed to be given. If this does not match, this document does not apply to the device.

Read DEVICEID.DEVICE, DEVICEID.MANUFACTURER and DEVICEID.ALWAYSONE and verify this value is identical to the expected value. Ignore DEVICEID.VERSION as this value can change without changing compatibility. If it does not match, stop.

If DEVICEID matches then check PARTID as follows:

  1. Check that PARTID.PART is exactly the expected value.

    If this is different the part is a different device in the same family and code must be checked and potentially re-verified.

  2. Check that PARTID.VARIANT is exactly as expected.

    If this is different this is a memory or package variant of the same device and code must be checked for compatibility with this variant.

  3. Check that PARTID.MAJORREV is exactly as expected.

    If this value is less than expected the device is older and may have reduced functionality. If it is higher it may have changes that break existing software compatibility and errata information should be checked and software should be re-verified for the new revision.

  4. Check that PARTID.MINORREV is greater than or equal to the expected

    value. No action is needed as any changes on the device is assured from the manufacturer to be compatible. If it is less than the expected value there may be added workarounds or features missing that may cause compatibility issues so errata notes and version update notes should be checked and software should be re-verified.