PNI SENtral - Manual (Page 41)

PNI Sensor Corporation Doc #1018049 R03
SENtral Technical Data Sheet Page 40
Table A1-2: Configuration File Data Structure
Byte Index Content Note
0x00 Signature Lower Byte Value is 0x8B. Can be used to locate
the data structure within the image.
0x01 Signature Upper Byte Value is 0xC8. Can be used to locate
the data structure within the image.
0x02 to 0x07 Reserved
0x08 & 0x09 RAM Version Firmware version number
0x0A Version Configuration Structure Version
0x0B Boot Protocol Used for standalone applications
0x0C to 0x13 PinSelection Bit 0-3 Host IRQ pin selection
Others – reserved
0x14 to 0x1B PullSelection Bit 0 & 1 GPIO0 pull selection
0=no pulls, 1=pull-down, 2=pull-up,
3=keep defaults
Bit 2 & 3 GPIO1 pull selection
Bit 4 & 5 GPIO2 pull selection
Bit 6 & 7 GPIO3 pull selection
Bit 8 & 9 GPIO4 pull selection
Bit 10 & 11 GPIO5 pull selection
Bit 12 & 13 GPIO6 pull selection
Others – reserved
0x1C to 0x2B Device Name 16 character string
When uploading the Configuration File from a dedicated EEPROM, SENtral first checks the
Magic Number upper and lower bytes to ensure they match the expected values. If they do, then
the upload will commence, and during the upload SENtral calculates the CRC32 value over the
incoming data. At the end of the upload process, the calculated CRC32 value is compared with
the valued stored in the header. If they match the Configuration File has been successfully
uploaded. If the the EEPROMExec bit is set to ‘0’, then the SENtral algorithm automatically
will execute and move SENtral in Initialized state, as shown in Figure 5-1.