PN532_HSU.cpp
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#include "PN532_HSU.h"
#include "PN532_debug.h"
PN532_HSU::PN532_HSU(HardwareSerial &serial)
{
_serial = &serial;
command = 0;
}
void PN532_HSU::begin()
{
_serial->begin(115200);
}
void PN532_HSU::wakeup()
{
_serial->write(0x55);
_serial->write(0x55);
_serial->write(0);
_serial->write(0);
_serial->write(0);
/** dump serial buffer */
if(_serial->available()){
DMSG("Dump serial buffer: ");
}
while(_serial->available()){
uint8_t ret = _serial->read();
DMSG_HEX(ret);
}
}
int8_t PN532_HSU::writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
{
/** dump serial buffer */
if(_serial->available()){
DMSG("Dump serial buffer: ");
}
while(_serial->available()){
uint8_t ret = _serial->read();
DMSG_HEX(ret);
}
command = header[0];
_serial->write(PN532_PREAMBLE);
_serial->write(PN532_STARTCODE1);
_serial->write(PN532_STARTCODE2);
uint8_t length = hlen + blen + 1; // length of data field: TFI + DATA
_serial->write(length);
_serial->write(~length + 1); // checksum of length
_serial->write(PN532_HOSTTOPN532);
uint8_t sum = PN532_HOSTTOPN532; // sum of TFI + DATA
DMSG("\nWrite: ");
_serial->write(header, hlen);
for (uint8_t i = 0; i < hlen; i++) {
sum += header[i];
DMSG_HEX(header[i]);
}
_serial->write(body, blen);
for (uint8_t i = 0; i < blen; i++) {
sum += body[i];
DMSG_HEX(body[i]);
}
uint8_t checksum = ~sum + 1; // checksum of TFI + DATA
_serial->write(checksum);
_serial->write(PN532_POSTAMBLE);
return readAckFrame();
}
int16_t PN532_HSU::readResponse(uint8_t buf[], uint8_t len, uint16_t timeout)
{
uint8_t tmp[3];
DMSG("\nRead: ");
/** Frame Preamble and Start Code */
if(receive(tmp, 3, timeout)<=0){
return PN532_TIMEOUT;
}
if(0 != tmp[0] || 0!= tmp[1] || 0xFF != tmp[2]){
DMSG("Preamble error");
return PN532_INVALID_FRAME;
}
/** receive length and check */
uint8_t length[2];
if(receive(length, 2, timeout) <= 0){
return PN532_TIMEOUT;
}
if( 0 != (uint8_t)(length[0] + length[1]) ){
DMSG("Length error");
return PN532_INVALID_FRAME;
}
length[0] -= 2;
if( length[0] > len){
return PN532_NO_SPACE;
}
/** receive command byte */
uint8_t cmd = command + 1; // response command
if(receive(tmp, 2, timeout) <= 0){
return PN532_TIMEOUT;
}
if( PN532_PN532TOHOST != tmp[0] || cmd != tmp[1]){
DMSG("Command error");
return PN532_INVALID_FRAME;
}
if(receive(buf, length[0], timeout) != length[0]){
return PN532_TIMEOUT;
}
uint8_t sum = PN532_PN532TOHOST + cmd;
for(uint8_t i=0; i<length[0]; i++){
sum += buf[i];
}
/** checksum and postamble */
if(receive(tmp, 2, timeout) <= 0){
return PN532_TIMEOUT;
}
if( 0 != (uint8_t)(sum + tmp[0]) || 0 != tmp[1] ){
DMSG("Checksum error");
return PN532_INVALID_FRAME;
}
return length[0];
}
int8_t PN532_HSU::readAckFrame()
{
const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0};
uint8_t ackBuf[sizeof(PN532_ACK)];
DMSG("\nAck: ");
if( receive(ackBuf, sizeof(PN532_ACK), PN532_ACK_WAIT_TIME) <= 0 ){
DMSG("Timeout\n");
return PN532_TIMEOUT;
}
if( memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK)) ){
DMSG("Invalid\n");
return PN532_INVALID_ACK;
}
return 0;
}
/**
@brief receive data .
@param buf --> return value buffer.
len --> length expect to receive.
timeout --> time of reveiving
@retval number of received bytes, 0 means no data received.
*/
int8_t PN532_HSU::receive(uint8_t *buf, int len, uint16_t timeout)
{
int read_bytes = 0;
int ret;
unsigned long start_millis;
while (read_bytes < len) {
start_millis = millis();
do {
ret = _serial->read();
if (ret >= 0) {
break;
}
} while((timeout == 0) || ((millis()- start_millis ) < timeout));
if (ret < 0) {
if(read_bytes){
return read_bytes;
}else{
return PN532_TIMEOUT;
}
}
buf[read_bytes] = (uint8_t)ret;
DMSG_HEX(ret);
read_bytes++;
}
return read_bytes;
}