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Add option to define extra symbols for 'lf cmdread', required e.g. for Hitag Micro and for talking to HT2 in emulation mode

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This commit is contained in:
Philippe Teuwen
2020-09-17 17:17:28 +02:00
parent 5a109122d3
commit 4ec7bca270
5 changed files with 65 additions and 32 deletions
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8
armsrc/appmain.c
View File

@@ -770,13 +770,15 @@ static void PacketReceived(PacketCommandNG *packet) {
case CMD_LF_MOD_THEN_ACQ_RAW_ADC: {
struct p {
uint32_t delay;
uint16_t ones;
uint16_t zeros;
uint16_t period_0;
uint16_t period_1;
uint8_t symbol_extra[LF_CMDREAD_MAX_EXTRA_SYMBOLS];
uint16_t period_extra[LF_CMDREAD_MAX_EXTRA_SYMBOLS];
uint32_t samples : 31;
bool verbose : 1;
} PACKED;
struct p *payload = (struct p *)packet->data.asBytes;
ModThenAcquireRawAdcSamples125k(payload->delay, payload->zeros, payload->ones, packet->data.asBytes + sizeof(struct p), payload->verbose, payload->samples);
ModThenAcquireRawAdcSamples125k(payload->delay, payload->period_0, payload->period_1, payload->symbol_extra, payload->period_extra, packet->data.asBytes + sizeof(struct p), payload->verbose, payload->samples);
break;
}
case CMD_LF_SNIFF_RAW_ADC: {

27
armsrc/lfops.c
View File

@@ -383,13 +383,15 @@ void loadT55xxConfig(void) {
* @param period_1
* @param command (in binary char array)
*/
void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint32_t period_1, uint8_t *command, bool verbose, uint32_t samples) {
void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint16_t period_0, uint16_t period_1, uint8_t *symbol_extra, uint16_t *period_extra, uint8_t *command, bool verbose, uint32_t samples) {
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
// use lf config settings
sample_config *sc = getSamplingConfig();
LFSetupFPGAForADC(sc->divisor, true);
// this causes the field to turn on for uncontrolled amount of time, so we'll turn it off
// Make sure the tag is reset
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
@@ -402,15 +404,14 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint
// clear read buffer
BigBuf_Clear_keep_EM();
LFSetupFPGAForADC(sc->divisor, true);
// little more time for the tag to fully power up
WaitMS(20);
// if delay_off = 0 then just bitbang 1 = antenna on 0 = off for respective periods.
bool bitbang = (delay_off == 0);
// now modulate the reader field
// Some tags need to be interrogated very soon after activation else they enter their emulation mode
// Therefore it's up to the caller to add an initial symbol of adequate duration, except for bitbang mode.
if (bitbang) {
TurnReadLFOn(20000);
// HACK it appears the loop and if statements take up about 7us so adjust waits accordingly...
uint8_t hack_cnt = 7;
if (period_0 < hack_cnt || period_1 < hack_cnt) {
@@ -459,11 +460,19 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint
} else { // old mode of cmd read using delay as off period
while (*command != '\0' && *command != ' ') {
LED_D_ON();
if (*(command++) == '0')
if (*command == '0') {
TurnReadLFOn(period_0);
else
} else if (*command == '1') {
TurnReadLFOn(period_1);
} else {
for (uint8_t i=0; i < LF_CMDREAD_MAX_EXTRA_SYMBOLS; i++) {
if (*command == symbol_extra[i]) {
TurnReadLFOn(period_extra[i]);
break;
}
}
}
command++;
LED_D_OFF();
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
WaitUS(delay_off);

2
armsrc/lfops.h
View File

@@ -15,7 +15,7 @@
#include "pm3_cmd.h" // struct
void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint32_t period_1, uint8_t *command, bool verbose, uint32_t samples);
void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint16_t period_0, uint16_t period_1, uint8_t *symbol_extra, uint16_t *period_extra, uint8_t *command, bool verbose, uint32_t samples);
void ReadTItag(void);
void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc);