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lf cmdread: add --crc to add Hitag/ZX8211 CRC

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This commit is contained in:
Philippe Teuwen 2021-12-18 01:34:14 +01:00
parent c3864a0ce5
commit b7ad0c450f
1 changed files with 34 additions and 1 deletions
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35
client/src/cmdlf.c
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@ -58,6 +58,7 @@
#include "cmdlfti.h" // for ti menu
#include "cmdlfviking.h" // for viking menu
#include "cmdlfvisa2000.h" // for VISA2000 menu
#include "crc.h"
#include "pm3_cmd.h" // for LF_CMDREAD_MAX_EXTRA_SYMBOLS
static bool gs_lf_threshold_set = false;
@ -232,6 +233,7 @@ int CmdLFCommandRead(const char *Cmd) {
arg_u64_0("s", "samples", "<dec>", "number of samples to collect"),
arg_lit0("v", "verbose", "verbose output"),
arg_lit0("k", "keep", "keep signal field ON after receive"),
arg_lit0(NULL, "crc", "calculate and append CRC-8 Hitag/ZX8211"),
arg_lit0("@", NULL, "continuous mode"),
arg_param_end
};
@ -251,7 +253,8 @@ int CmdLFCommandRead(const char *Cmd) {
uint32_t samples = arg_get_u32_def(ctx, 6, 0);
bool verbose = arg_get_lit(ctx, 7);
bool keep_field_on = arg_get_lit(ctx, 8);
bool cm = arg_get_lit(ctx, 9);
bool add_crc = arg_get_lit(ctx, 9);
bool cm = arg_get_lit(ctx, 10);
CLIParserFree(ctx);
if (g_session.pm3_present == false)
@ -275,6 +278,36 @@ int CmdLFCommandRead(const char *Cmd) {
payload.samples = samples;
payload.keep_field_on = keep_field_on;
payload.verbose = verbose;
if (add_crc && (cmd_len <= 120)) {
crc_t crc;
uint8_t data = 0;
uint8_t n = 0;
crc_init_ref(&crc, 8, 0x1d, 0xff, 0, false, false);
uint8_t i;
for (i=0;i<cmd_len;i++) {
if ((cmd[i] != '0') && (cmd[i] != '1')) {
continue;
}
data <<= 1;
data += cmd[i] - '0';
n += 1;
if (n==8) {
crc_update2(&crc, data, n);
n = 0;
data = 0;
}
}
if (n > 0) {
crc_update2(&crc, data, n);
}
uint8_t crc_final = crc_finish(&crc);
for (int j=7; j>=0; j--) {
cmd[cmd_len] = ((crc_final >> j) & 1) ? '1' : '0';
cmd_len++;
}
}
memcpy(payload.data, cmd, cmd_len);
// extra symbol definition