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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
commit 4ec7bca270
5 changed files with 65 additions and 32 deletions
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27
armsrc/lfops.c
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@ -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);