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added 4x50_sread

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tharexde 2020-06-26 14:19:41 +02:00
commit 1fd3afa002
1 changed files with 44 additions and 1 deletions
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45
armsrc/em4x50.c
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@ -754,6 +754,49 @@ void em4x50_info(em4x50_data_t *etd) {
reply_ng(CMD_ACK, status, (uint8_t *)tag.sectors, 238);
}
void em4x50_sread(em4x50_data_t *etd) {
// reads single word in two alternative ways:
// - using "selective read mode" -> bidirectional communication
// - using "standard read mode" -> unidirectional communication (read
// data that tag transmits "voluntarily")
bool bsuccess = false, blogin = false;
int now = 0;
uint8_t status = 0;
uint8_t addresses[] = {0x00, 0x00, 0x00, 0x00}; // fwr = 0, lwr = 33
init_tag();
em4x50_setup_read();
// set gHigh and gLow
get_signalproperties();
if (etd->addr_given) {
// selective read mode
// try to login with given password
if (etd->pwd_given)
blogin = login(etd->password);
// only one word has to be read -> first word read = last word read
addresses[2] = addresses[3] = etd->address;
bsuccess = selective_read(addresses);
} else {
// standard read mode
bsuccess = standard_read(&now);
}
status = (now << 2) + (bsuccess << 1) + blogin;
lf_finalize();
reply_ng(CMD_ACK, status, (uint8_t *)tag.sectors, 238);
}
// write functions
static bool write(uint8_t word[4], uint8_t address) {
@ -864,7 +907,7 @@ void em4x50_write(em4x50_data_t *etd) {
if (etd->pwd_given)
blogin &= login(etd->password);
// perform a selective read
// call a selective read
addresses[2] = addresses[3] = etd->address;
if (selective_read(addresses)) {