Use radix_width=8 and field width=32 to show that there are 4 char per field word.

boards/uniboard2b/libraries/unb2b_board/unb2b_board.peripheral.yaml

@@ -104,6 +104,7 @@ peripherals:
               address_offset: 0x8
               number_of_fields: 13
               radix: char
+              radix_width: 8
           - - field_name: stamp_date
               field_description: "FPGA FW compile date string."
               access_mode: RO
@@ -126,6 +127,7 @@ peripherals:
               address_offset: 0x50
               number_of_fields: 13
               radix: char
+              radix_width: 8
               
   - peripheral_name: wdi  # pi_wdi.py
     peripheral_description: ""