1a2e5ee4
 henyxia
Big revision
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#include <util/delay.h>
#include "PN532_SPI.h"
#include "PN532_debug.h"
#include "Arduino.h"
#define STATUS_READ 2
#define DATA_WRITE 1
#define DATA_READ 3
#define delay(a) _delay_ms(a)
void send_serial(unsigned char);
PN532_SPI::PN532_SPI(SPIClass &spi, uint8_t ss)
{
command = 0;
_spi = &spi;
_ss = ss;
}
void PN532_SPI::begin()
{
pinMode(_ss, OUTPUT);
_spi->begin();
_spi->setDataMode(SPI_MODE0); // PN532 only supports mode0
_spi->setBitOrder(LSBFIRST);
#ifndef __SAM3X8E__
_spi->setClockDivider(SPI_CLOCK_DIV8); // set clock 2MHz(max: 5MHz)
#else
/** DUE spi library does not support SPI_CLOCK_DIV8 macro */
_spi->setClockDivider(42); // set clock 2MHz(max: 5MHz)
#endif
}
void PN532_SPI::wakeup()
{
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1a2e5ee4
henyxia
Big revision
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}
int8_t PN532_SPI::writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
{
command = header[0];
writeFrame(header, hlen, body, blen);
uint8_t timeout = PN532_ACK_WAIT_TIME;
while (!isReady()) {
delay(1);
timeout--;
if (0 == timeout) {
DMSG("Time out when waiting for ACK\n");
return -2;
}
}
if (readAckFrame()) {
DMSG("Invalid ACK\n");
return PN532_INVALID_ACK;
}
return 0;
}
int16_t PN532_SPI::readResponse(uint8_t buf[], uint8_t len, uint16_t timeout)
{
uint16_t time = 0;
while (!isReady()) {
delay(1);
time++;
if (timeout > 0 && time > timeout) {
return PN532_TIMEOUT;
}
}
digitalWrite(_ss, LOW);
delay(1);
int16_t result;
do {
write(DATA_READ);
if (0x00 != read() || // PREAMBLE
0x00 != read() || // STARTCODE1
0xFF != read() // STARTCODE2
) {
result = PN532_INVALID_FRAME;
break;
}
uint8_t length = read();
if (0 != (uint8_t)(length + read())) { // checksum of length
result = PN532_INVALID_FRAME;
break;
}
uint8_t cmd = command + 1; // response command
if (PN532_PN532TOHOST != read() || (cmd) != read()) {
result = PN532_INVALID_FRAME;
break;
}
DMSG("read: ");
DMSG_HEX(cmd);
length -= 2;
if (length > len) {
for (uint8_t i = 0; i < length; i++) {
DMSG_HEX(read()); // dump message
}
DMSG("\nNot enough space\n");
read();
read();
result = PN532_NO_SPACE; // not enough space
break;
}
uint8_t sum = PN532_PN532TOHOST + cmd;
for (uint8_t i = 0; i < length; i++) {
buf[i] = read();
sum += buf[i];
DMSG_HEX(buf[i]);
}
DMSG('\n');
uint8_t checksum = read();
if (0 != (uint8_t)(sum + checksum)) {
DMSG("checksum is not ok\n");
result = PN532_INVALID_FRAME;
break;
}
read(); // POSTAMBLE
result = length;
} while (0);
digitalWrite(_ss, HIGH);
return result;
}
boolean PN532_SPI::isReady()
{
digitalWrite(_ss, LOW);
write(STATUS_READ);
uint8_t status = read() & 1;
digitalWrite(_ss, HIGH);
return status;
}
void PN532_SPI::writeFrame(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
{
digitalWrite(_ss, LOW);
delay(2); // wake up PN532
write(DATA_WRITE);
write(PN532_PREAMBLE);
write(PN532_STARTCODE1);
write(PN532_STARTCODE2);
uint8_t length = hlen + blen + 1; // length of data field: TFI + DATA
write(length);
write(~length + 1); // checksum of length
write(PN532_HOSTTOPN532);
uint8_t sum = PN532_HOSTTOPN532; // sum of TFI + DATA
DMSG("write: ");
for (uint8_t i = 0; i < hlen; i++) {
write(header[i]);
sum += header[i];
DMSG_HEX(header[i]);
}
for (uint8_t i = 0; i < blen; i++) {
write(body[i]);
sum += body[i];
DMSG_HEX(body[i]);
}
uint8_t checksum = ~sum + 1; // checksum of TFI + DATA
write(checksum);
write(PN532_POSTAMBLE);
digitalWrite(_ss, HIGH);
DMSG('\n');
}
int8_t PN532_SPI::readAckFrame()
{
const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0};
uint8_t ackBuf[sizeof(PN532_ACK)];
digitalWrite(_ss, LOW);
delay(1);
write(DATA_READ);
for (uint8_t i = 0; i < sizeof(PN532_ACK); i++) {
ackBuf[i] = read();
}
digitalWrite(_ss, HIGH);
return memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK));
}
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