+int CmdLFReadUsage()
+{
+ PrintAndLog("Usage: lf read [H|<divisor>] [b <bps>] [d <decim>] [a 0|1]");
+ PrintAndLog("Options: ");
+ PrintAndLog(" h This help");
+ PrintAndLog(" H High frequency (134 KHz). Defaults to 125 KHz");
+ PrintAndLog(" <divisor> Manually set divisor. 88-> 134KHz, 95-> 125 Hz");
+ PrintAndLog(" b <bps> Sets resolution of bits per sample. Default (max): 8");
+ PrintAndLog(" d <decim> Sets decimation. A value of N saves only 1 in N samples. Default: 1");
+ PrintAndLog(" a [0|1] Averaging - if set, will average the stored sample value when decimating. Default: 1");
+ PrintAndLog("Examples:");
+ PrintAndLog(" lf read");
+ PrintAndLog(" Samples at 125KHz, 8bps.");
+ PrintAndLog(" lf read h b 4 d 3");
+ PrintAndLog(" Samples at 134KHz, averages three samples into one, stored with ");
+ PrintAndLog(" a resolution of 4 bits per sample.");
+ return 0;
+}
+int CmdLFRead(const char *Cmd)
+{
+ uint8_t divisor = 95;//Frequency divisor
+ uint8_t bps = 8; // Bits per sample
+ uint8_t decimation = 1; //How many to keep
+ bool averaging = 1; // Should we use averaging when discarding samples?
+ bool errors = FALSE;
+
+ uint8_t cmdp =0;
+ if(param_getchar(Cmd, cmdp) == 'h')
+ {
+ return CmdLFReadUsage();
+ }
+
+ // Divisor
+ if(param_getchar(Cmd, cmdp) == 'H') {
+ divisor = 88;
+ cmdp++;
+ }else if(param_isdec(Cmd,cmdp) )
+ {
+ errors |= param_getdec(Cmd,cmdp, &divisor);
+ }
+ //BPS
+ if(param_getchar(Cmd, cmdp) == 'b') {
+ errors |= param_getdec(Cmd,cmdp+1,&bps);
+ cmdp+=2;
+ }
+ //Decimation
+ if(param_getchar(Cmd, cmdp) == 'd')
+ {
+ errors |= param_getdec(Cmd,cmdp+1,&decimation);
+ cmdp+=2;
+ }
+ //Averaging
+ if(param_getchar(Cmd, cmdp) == 'a')
+ {
+ averaging = param_getchar(Cmd,cmdp+1) == '1';
+ cmdp+=2;
+ }
+ //Validations
+ if(errors)
+ {
+ return CmdLFReadUsage();
+ }
+
+ //Bps is limited to 8, so fits in lower half of arg1
+ if(bps > 8) bps = 8;
+
+ //Feedback
+ PrintAndLog("Sampling config: ");
+ PrintAndLog(" divisor: %d ", divisor);
+ PrintAndLog(" bps: %d ", bps);
+ PrintAndLog(" decimation: %d ", decimation);
+ PrintAndLog(" averaging: %d ", averaging);
+ PrintAndLog("OBS, this is sticky on the device and affects all LF listening operations");
+ PrintAndLog("To reset, issue 'lf read'");
+
+ //And ship it to device
+ //Averaging is a flag on high-bit of arg[1]
+ UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_125K};
+ c.arg[0] = divisor;
+ c.arg[1] = bps | (averaging << 7) ;
+ c.arg[2] = decimation;
+
+ SendCommand(&c);
+ WaitForResponse(CMD_ACK,NULL);
+ return 0;
+}
+