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* Add an option to lf read command to use an arbitrary divisor, enabling reading at frequencies other than 125 and 134 kHz.

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This commit is contained in:
henryk@ploetzli.ch 2013-09-27 13:48:20 +00:00
commit bf7163bdb3
3 changed files with 9 additions and 7 deletions
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2
armsrc/apps.h
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@ -108,7 +108,7 @@ void SetAdcMuxFor(uint32_t whichGpio);
#define FPGA_HF_ISO14443A_READER_MOD (4<<0)
/// lfops.h
void AcquireRawAdcSamples125k(int at134khz);
void AcquireRawAdcSamples125k(int divisor);
void ModThenAcquireRawAdcSamples125k(int delay_off,int period_0,int period_1,uint8_t *command);
void ReadTItag(void);
void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc);

8
armsrc/lfops.c
View file

@ -15,12 +15,14 @@
#include "crc16.h"
#include "string.h"
void AcquireRawAdcSamples125k(int at134khz)
void AcquireRawAdcSamples125k(int divisor)
{
if (at134khz)
if ( (divisor == 1) || (divisor < 0) || (divisor > 255) )
FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
else
else if (divisor == 0)
FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
else
FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor);
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);