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Downloading a Correlation Record
The following details simplified Ccode routine to download three types of records stored in the system
memory. The first selection is a memory bank where the last correlation template pattern is stored. The last
received signal record stored is in bank 2 while bank 3 stores the full correlation record. See detailed
descriptions of the accessed control registers in Appendix A for a detailed explanation of their function.
Note: Only external registers are accessed using this command and the correlation processor cannot be in
a sleep state.
Sample C Code Download Correlation Data to a Serial Port Using Put
This pseudo code can be used as a basis for the download of correlation data for analysis.
bank_num – memory banks in the correlation processor
1: template memory
2: last signal record
3: correlation record
Function write_twi (register address (hex), value);
Function read_twi (register address (hex), number of bytes)
Elements – number of words to be transferred
read_val is 16 bit integer
if (bank_num == 3){
write_twi (0x51, 0x10); // points to the base of the correlation record address
write_twi (0x53, (char) (bank_num <<6));
// selects memory bank
write_twi (0x40, 0x06); //sets test mode select
For (i=0; i<elements; i++) {
read_val = (unsigned char) read_twi (0x52, 1); // added to select single byte
if (read_twi (0x5d, 1)) read_val |= 0xff00; // if upper byte lsb is set, the value is negative
put_dec (read_val);
T0_Wait_ms (1); //hold longer than the transfer time for the serial transfer.
}
write_twi (0x40, 0x00); // return to normal control – null command to control register
}
LIDARLite v1 "Silver Label" Manual , Updated: 08/13/15
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