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Tasmota/sonoff/xsns_40_pn532_i2c.ino

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/*
xsns_40_pn532.ino - Support for PN532 (I2C) NFC Tag Reader
Copyright (C) 2019 Andre Thomas and Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_I2C
#ifdef USE_PN532_I2C
/*********************************************************************************************\
* PN532 - Near Field Communication (NFC) controller
*
* Datasheet at https://www.nxp.com/docs/en/nxp/data-sheets/PN532_C1.pdf
*
* I2C Address: 0x24
\*********************************************************************************************/
#define XSNS_40 40
#define PN532_I2C_ADDRESS 0x24
#define PN532_COMMAND_GETFIRMWAREVERSION 0x02
#define PN532_COMMAND_SAMCONFIGURATION 0x14
#define PN532_COMMAND_INDATAEXCHANGE 0x40
#define PN532_COMMAND_INLISTPASSIVETARGET 0x4A
#define MIFARE_CMD_READ 0x30
#define MIFARE_CMD_AUTH_A 0x60
#define MIFARE_CMD_AUTH_B 0x61
#define MIFARE_CMD_WRITE 0xA0
#define PN532_PREAMBLE 0x00
#define PN532_STARTCODE1 0x00
#define PN532_STARTCODE2 0xFF
#define PN532_POSTAMBLE 0x00
#define PN532_HOSTTOPN532 0xD4
#define PN532_PN532TOHOST 0xD5
#define PN532_INVALID_ACK -1
#define PN532_TIMEOUT -2
#define PN532_INVALID_FRAME -3
#define PN532_NO_SPACE -4
#define PN532_MIFARE_ISO14443A 0x00
uint8_t pn532_i2c_detected = 0;
uint8_t pn532_i2c_packetbuffer[64];
uint8_t pn532_i2c_scan_defer_report = 0; // If a valid card was found we will not scan for one again in the same two seconds so we set this to 19 if a card was found
uint8_t pn532_i2c_command = 0;
uint8_t pn532_i2c_disable = 0;
uint8_t pn532_i2c_function = 0;
uint8_t pn532_i2c_newdata[16];
const uint8_t PROGMEM pn532_global_timeout = 10;
int16_t PN532_getResponseLength(uint8_t buf[], uint8_t len) {
const uint8_t PN532_NACK[] = {0, 0, 0xFF, 0xFF, 0, 0};
uint8_t time = 0;
do {
if (Wire.requestFrom(PN532_I2C_ADDRESS, 6)) {
if (Wire.read() & 1) { // check first byte --- status
break; // PN532 is ready
}
}
delay(1);
time++;
if (time > pn532_global_timeout) {
return -1;
}
} while (1);
if ((0x00 != Wire.read()) || (0x00 != Wire.read()) || (0xFF != Wire.read())) { // PREAMBLE || STARTCODE1 || STARTCODE2
return PN532_INVALID_FRAME;
}
uint8_t length = Wire.read();
// request for last respond msg again
Wire.beginTransmission(PN532_I2C_ADDRESS);
for (uint16_t i = 0;i < sizeof(PN532_NACK); ++i) {
Wire.write(PN532_NACK[i]);
}
Wire.endTransmission();
return length;
}
int16_t PN532_readResponse(uint8_t buf[], uint8_t len)
{
uint8_t time = 0;
uint8_t length;
length = PN532_getResponseLength(buf, len);
// [RDY] 00 00 FF LEN LCS (TFI PD0 ... PDn) DCS 00
do {
if (Wire.requestFrom(PN532_I2C_ADDRESS, 6 + length + 2)) {
if (Wire.read() & 1) { // check first byte --- status
break; // PN532 is ready
}
}
delay(1);
time++;
if (time > pn532_global_timeout) {
return -1;
}
} while (1);
if ((0x00 != Wire.read()) || (0x00 != Wire.read()) || (0xFF != Wire.read())) { // PREAMBLE || STARTCODE1 || STARTCODE2
return PN532_INVALID_FRAME;
}
length = Wire.read();
if (0 != (uint8_t)(length + Wire.read())) { // checksum of length
return PN532_INVALID_FRAME;
}
uint8_t cmd = pn532_i2c_command + 1; // response command
if ((PN532_PN532TOHOST != Wire.read()) || ((cmd) != Wire.read())) {
return PN532_INVALID_FRAME;
}
length -= 2;
if (length > len) {
return PN532_NO_SPACE; // not enough space
}
uint8_t sum = PN532_PN532TOHOST + cmd;
for (uint8_t i = 0; i < length; i++) {
buf[i] = Wire.read();
sum += buf[i];
}
uint8_t checksum = Wire.read();
if (0 != (uint8_t)(sum + checksum)) {
return PN532_INVALID_FRAME;
}
Wire.read(); // POSTAMBLE
return length;
}
int8_t PN532_readAckFrame(void)
{
const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0};
uint8_t ackBuf[sizeof(PN532_ACK)];
uint8_t time = 0;
do {
if (Wire.requestFrom(PN532_I2C_ADDRESS, sizeof(PN532_ACK) + 1)) {
if (Wire.read() & 1) { // check first byte --- status
break; // PN532 is ready
}
}
delay(1);
time++;
if (time > pn532_global_timeout) { // We time out after 10ms
return PN532_TIMEOUT;
}
} while (1);
for (uint8_t i = 0; i < sizeof(PN532_ACK); i++) {
ackBuf[i] = Wire.read();
}
if (memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK))) {
return PN532_INVALID_ACK;
}
return 0;
}
int8_t PN532_writeCommand(const uint8_t *header, uint8_t hlen)
{
pn532_i2c_command = header[0];
Wire.beginTransmission(PN532_I2C_ADDRESS);
Wire.write(PN532_PREAMBLE);
Wire.write(PN532_STARTCODE1);
Wire.write(PN532_STARTCODE2);
uint8_t length = hlen + 1; // TFI + DATA
Wire.write(length);
Wire.write(~length + 1); // checksum of length
Wire.write(PN532_HOSTTOPN532);
uint8_t sum = PN532_HOSTTOPN532; // Sum of TFI + DATA
for (uint8_t i = 0; i < hlen; i++) {
if (Wire.write(header[i])) {
sum += header[i];
} else {
return PN532_INVALID_FRAME;
}
}
uint8_t checksum = ~sum + 1; // Checksum of TFI + DATA
Wire.write(checksum);
Wire.write(PN532_POSTAMBLE);
Wire.endTransmission();
return PN532_readAckFrame();
}
uint32_t PN532_getFirmwareVersion(void)
{
uint32_t response;
pn532_i2c_packetbuffer[0] = PN532_COMMAND_GETFIRMWAREVERSION;
if (PN532_writeCommand(pn532_i2c_packetbuffer, 1)) {
return 0;
}
int16_t status = PN532_readResponse(pn532_i2c_packetbuffer, sizeof(pn532_i2c_packetbuffer));
if (0 > status) {
return 0;
}
response = pn532_i2c_packetbuffer[0];
response <<= 8;
response |= pn532_i2c_packetbuffer[1];
response <<= 8;
response |= pn532_i2c_packetbuffer[2];
response <<= 8;
response |= pn532_i2c_packetbuffer[3];
return response;
}
bool PN532_SAMConfig(void)
{
pn532_i2c_packetbuffer[0] = PN532_COMMAND_SAMCONFIGURATION;
pn532_i2c_packetbuffer[1] = 0x01; // normal mode;
pn532_i2c_packetbuffer[2] = 0x01; // timeout 50ms * 1 = 50ms
pn532_i2c_packetbuffer[3] = 0x00; // Disable IRQ pin
if (PN532_writeCommand(pn532_i2c_packetbuffer, 4))
return false;
return (0 < PN532_readResponse(pn532_i2c_packetbuffer, sizeof(pn532_i2c_packetbuffer)));
}
void PN532_Detect(void)
{
if ((pn532_i2c_detected) || (pn532_i2c_disable)) { return; }
Wire.setClockStretchLimit(1000); // Enable 1ms clock stretch as per datasheet Table 12.25 (Timing for the I2C interface)
uint32_t ver = PN532_getFirmwareVersion();
if (ver) {
pn532_i2c_detected = 1;
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "PN532 NFC Reader (V%u.%u)", PN532_I2C_ADDRESS);
snprintf_P(log_data, sizeof(log_data), log_data, (ver>>16) & 0xFF, (ver>>8) & 0xFF);
AddLog(LOG_LEVEL_DEBUG);
PN532_SAMConfig();
}
}
boolean PN532_readPassiveTargetID(uint8_t cardbaudrate, uint8_t *uid, uint8_t *uidLength)
{
pn532_i2c_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET;
pn532_i2c_packetbuffer[1] = 1;
pn532_i2c_packetbuffer[2] = cardbaudrate;
if (PN532_writeCommand(pn532_i2c_packetbuffer, 3)) {
return false; // command failed
}
if (PN532_readResponse(pn532_i2c_packetbuffer, sizeof(pn532_i2c_packetbuffer)) < 0) { // No data packet so no tag was found
Wire.beginTransmission(PN532_I2C_ADDRESS);
Wire.endTransmission();
return false;
}
if (pn532_i2c_packetbuffer[0] != 1) { return false; } // Not a valid tag
*uidLength = pn532_i2c_packetbuffer[5];
for (uint8_t i = 0;i < pn532_i2c_packetbuffer[5]; i++) {
uid[i] = pn532_i2c_packetbuffer[6 + i];
}
return true;
}
uint8_t mifareclassic_AuthenticateBlock (uint8_t *uid, uint8_t uidLen, uint32_t blockNumber, uint8_t keyNumber, uint8_t *keyData)
{
uint8_t i;
uint8_t _key[6];
uint8_t _uid[7];
uint8_t _uidLen;
// Hang on to the key and uid data
memcpy (_key, keyData, 6);
memcpy (_uid, uid, uidLen);
_uidLen = uidLen;
// Prepare the authentication command //
pn532_i2c_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE; /* Data Exchange Header */
pn532_i2c_packetbuffer[1] = 1; /* Max card numbers */
pn532_i2c_packetbuffer[2] = (keyNumber) ? MIFARE_CMD_AUTH_B : MIFARE_CMD_AUTH_A;
pn532_i2c_packetbuffer[3] = blockNumber; /* Block Number (1K = 0..63, 4K = 0..255 */
memcpy (&pn532_i2c_packetbuffer[4], _key, 6);
for (i = 0; i < _uidLen; i++) {
pn532_i2c_packetbuffer[10 + i] = _uid[i]; /* 4 bytes card ID */
}
if (PN532_writeCommand(pn532_i2c_packetbuffer, 10 + _uidLen))
return 0;
// Read the response packet
PN532_readResponse(pn532_i2c_packetbuffer, sizeof(pn532_i2c_packetbuffer));
// Check if the response is valid and we are authenticated???
// for an auth success it should be bytes 5-7: 0xD5 0x41 0x00
// Mifare auth error is technically byte 7: 0x14 but anything other and 0x00 is not good
if (pn532_i2c_packetbuffer[0] != 0x00) {
// Authentification failed
return 0;
}
return 1;
}
uint8_t mifareclassic_ReadDataBlock (uint8_t blockNumber, uint8_t *data)
{
/* Prepare the command */
pn532_i2c_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
pn532_i2c_packetbuffer[1] = 1; /* Card number */
pn532_i2c_packetbuffer[2] = MIFARE_CMD_READ; /* Mifare Read command = 0x30 */
pn532_i2c_packetbuffer[3] = blockNumber; /* Block Number (0..63 for 1K, 0..255 for 4K) */
/* Send the command */
if (PN532_writeCommand(pn532_i2c_packetbuffer, 4)) {
return 0;
}
/* Read the response packet */
PN532_readResponse(pn532_i2c_packetbuffer, sizeof(pn532_i2c_packetbuffer));
/* If byte 8 isn't 0x00 we probably have an error */
if (pn532_i2c_packetbuffer[0] != 0x00) {
return 0;
}
/* Copy the 16 data bytes to the output buffer */
/* Block content starts at byte 9 of a valid response */
memcpy (data, &pn532_i2c_packetbuffer[1], 16);
return 1;
}
uint8_t mifareclassic_WriteDataBlock (uint8_t blockNumber, uint8_t *data)
{
/* Prepare the first command */
pn532_i2c_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
pn532_i2c_packetbuffer[1] = 1; /* Card number */
pn532_i2c_packetbuffer[2] = MIFARE_CMD_WRITE; /* Mifare Write command = 0xA0 */
pn532_i2c_packetbuffer[3] = blockNumber; /* Block Number (0..63 for 1K, 0..255 for 4K) */
memcpy(&pn532_i2c_packetbuffer[4], data, 16); /* Data Payload */
/* Send the command */
if (PN532_writeCommand(pn532_i2c_packetbuffer, 20)) {
return 0;
}
/* Read the response packet */
return (0 < PN532_readResponse(pn532_i2c_packetbuffer, sizeof(pn532_i2c_packetbuffer)));
}
void PN532_ScanForTag(void)
{
if (pn532_i2c_disable) { return; }
uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };
uint8_t uid_len = 0;
uint8_t card_data[16];
boolean erase_success = false;
boolean set_success = false;
if (PN532_readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uid_len)) {
if (pn532_i2c_scan_defer_report > 0) {
pn532_i2c_scan_defer_report--;
} else {
char uids[15];
char card_datas[34];
sprintf(uids,"");
for (uint8_t i = 0;i < uid_len;i++) {
sprintf(uids,"%s%02X",uids,uid[i]);
}
if (uid_len == 4) { // Lets try to read block 0 of the mifare classic card for more information
uint8_t keyuniversal[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
if (mifareclassic_AuthenticateBlock (uid, uid_len, 1, 1, keyuniversal)) {
if (mifareclassic_ReadDataBlock(1, card_data)) {
memcpy(&card_datas,card_data,sizeof(card_data)); // Cast block 0 to a string
}
if (pn532_i2c_function == 1) { // erase block 1 of card
for (uint8_t i = 0;i<16;i++) {
card_data[i] = 0x00;
}
if (mifareclassic_WriteDataBlock(1, card_data)) {
erase_success = true;
snprintf_P(log_data, sizeof(log_data),"I2C: PN532 NFC - Erase success");
AddLog(LOG_LEVEL_INFO);
memcpy(&card_datas,card_data,sizeof(card_data)); // Cast block 0 to a string
}
}
if (pn532_i2c_function == 2) {
memcpy(&card_data,&pn532_i2c_newdata,sizeof(card_data));
if (mifareclassic_WriteDataBlock(1, card_data)) {
set_success = true;
snprintf_P(log_data, sizeof(log_data),"I2C: PN532 NFC - Data write successful");
AddLog(LOG_LEVEL_INFO);
memcpy(&card_datas,card_data,sizeof(card_data)); // Cast block 0 to a string
}
}
} else {
sprintf(card_datas,"AUTHFAIL");
}
}
switch (pn532_i2c_function) {
case 0x01:
if (!erase_success) {
snprintf_P(log_data, sizeof(log_data),"I2C: PN532 NFC - Erase fail - exiting erase mode");
AddLog(LOG_LEVEL_INFO);
}
break;
case 0x02:
if (!set_success) {
snprintf_P(log_data, sizeof(log_data),"I2C: PN532 NFC - Write failed - exiting set mode");
AddLog(LOG_LEVEL_INFO);
}
default:
break;
}
pn532_i2c_function = 0;
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_JSON_TIME "\":\"%s\""), GetDateAndTime(DT_LOCAL).c_str());
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"PN532\":{\"UID\":\"%s\", \"DATA\":\"%s\"}}"), mqtt_data, uids, card_datas);
MqttPublishPrefixTopic_P(TELE, PSTR(D_RSLT_SENSOR), Settings.flag.mqtt_sensor_retain);
#ifdef USE_PN532_CAUSE_EVENTS
char command[71];
sprintf(command,"backlog event PN532_UID=%s;event PN532_DATA=%s",uids,card_datas);
ExecuteCommand(command, SRC_RULE);
#endif
pn532_i2c_scan_defer_report = 7; // Ignore tags found for two seconds
}
} else {
if (pn532_i2c_scan_defer_report > 0) { pn532_i2c_scan_defer_report--; }
}
}
boolean PN532_Command(void)
{
boolean serviced = true;
uint8_t paramcount = 0;
if (XdrvMailbox.data_len > 0) {
paramcount=1;
} else {
serviced = false;
return serviced;
}
char sub_string[XdrvMailbox.data_len];
char sub_string_tmp[XdrvMailbox.data_len];
for (uint8_t ca=0;ca<XdrvMailbox.data_len;ca++) {
if ((' ' == XdrvMailbox.data[ca]) || ('=' == XdrvMailbox.data[ca])) { XdrvMailbox.data[ca] = ','; }
if (',' == XdrvMailbox.data[ca]) { paramcount++; }
}
UpperCase(XdrvMailbox.data,XdrvMailbox.data);
if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 1),"E")) {
pn532_i2c_function = 1; // Block 0 of next card/tag will be reset to 0x00...
snprintf_P(log_data, sizeof(log_data),"I2C: PN532 NFC - Next scanned tag data block 1 will be erased");
AddLog(LOG_LEVEL_INFO);
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_JSON_TIME "\":\"%s\""), GetDateAndTime(DT_LOCAL).c_str());
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"PN532\":{\"COMMAND\":\"E\"\"}}"), mqtt_data);
return serviced;
}
if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 1),"S")) {
if (paramcount > 1) {
sprintf(sub_string_tmp,subStr(sub_string, XdrvMailbox.data, ",", 2));
uint8_t dlen = strlen(sub_string_tmp);
if (dlen > 15) { dlen = 15; }
memcpy(&pn532_i2c_newdata,&sub_string_tmp,dlen);
pn532_i2c_newdata[dlen] = 0x00; // Null terminate the string
pn532_i2c_function = 2;
snprintf_P(log_data, sizeof(log_data),"I2C: PN532 NFC - Next scanned tag data block 1 will be set to '%s'",pn532_i2c_newdata);
AddLog(LOG_LEVEL_INFO);
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_JSON_TIME "\":\"%s\""), GetDateAndTime(DT_LOCAL).c_str());
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"PN532\":{\"COMMAND\":\"S\"\"}}"), mqtt_data);
return serviced;
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
boolean Xsns40(byte function)
{
boolean result = false;
if (i2c_flg) {
switch (function) {
case FUNC_EVERY_250_MSECOND:
if (pn532_i2c_detected) {
PN532_ScanForTag();
}
break;
case FUNC_EVERY_SECOND:
PN532_Detect();
break;
case FUNC_COMMAND:
if (XSNS_40 == XdrvMailbox.index) {
result = PN532_Command();
}
break;
case FUNC_SAVE_BEFORE_RESTART:
if (!pn532_i2c_disable) {
pn532_i2c_disable = 1;
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "PN532 NFC Reader - Disabling for reboot", PN532_I2C_ADDRESS);
AddLog(LOG_LEVEL_DEBUG);
}
break;
default:
break;
}
}
return result;
}
#endif // USE_PN532_I2C
#endif // USE_I2C
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