1a2e5ee4
 henyxia
Big revision
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#ifndef __PN532_INTERFACE_H__
#define __PN532_INTERFACE_H__
#include <stdint.h>
#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_ACK_WAIT_TIME (10) // ms, timeout of waiting for ACK
#define PN532_INVALID_ACK (-1)
#define PN532_TIMEOUT (-2)
#define PN532_INVALID_FRAME (-3)
#define PN532_NO_SPACE (-4)
#define REVERSE_BITS_ORDER(b) b = (b & 0xF0) >> 4 | (b & 0x0F) << 4; \
b = (b & 0xCC) >> 2 | (b & 0x33) << 2; \
b = (b & 0xAA) >> 1 | (b & 0x55) << 1
class PN532Interface
{
public:
virtual void begin() = 0;
virtual void wakeup() = 0;
/**
* @brief write a command and check ack
* @param header packet header
* @param hlen length of header
* @param body packet body
* @param blen length of body
* @return 0 success
* not 0 failed
*/
virtual int8_t writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body = 0, uint8_t blen = 0) = 0;
/**
* @brief read the response of a command, strip prefix and suffix
* @param buf to contain the response data
* @param len lenght to read
* @param timeout max time to wait, 0 means no timeout
* @return >=0 length of response without prefix and suffix
* <0 failed to read response
*/
virtual int16_t readResponse(uint8_t buf[], uint8_t len, uint16_t timeout = 1000) = 0;
};
#endif
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