arrow-firmware/main/kiss.h

/*
 * tnc_kiss.h
 *
 *  Created on: Jun 12, 2019
 *      Author: curiousmuch
 */

#ifndef MAIN_KISS_H_
#define MAIN_KISS_H_

// Logging Tag
#define TNC_TAG "KISS"

// Frame Buffer
#define FRAME_BUFFER_SIZE 512

// KISS Specific Characters
#define KISS_FEND 	0xC0
#define KISS_FESC 	0xDB
#define KISS_TFEND 	0xDC
#define KISS_TFESC 	0xDD

// KISS Commands
// command Structure: [ 4 bits ][ 4 bits ]
//				 	  [ TNC #  ][   cmd  ]
#define KISS_DATAFRAME			0x00		// data to be send on HDLC channel
#define KISS_CMD_TXDELAY		0x01		// keyup delay in 10ms units. default is 50ms.
#define KISS_CMD_P				0x02
#define KISS_CMD_SLOTTIME		0x03
#define KISS_CMD_TXTAIL 		0x04
#define KISS_CMD_FULLDUPLEX		0x05
#define KISS_CMD_SETHARDWARE	0x06
#define KISS_CMD_RETURN			0xFF

// TXDELAY: TX keyup delay in 10 ms units. Default = 50 (500ms)
// P: Persistence scaled 0 - 255. P = p *256 -1. Default = 63 (p = 0.25)
// SlotTime: Slot interval in 10ms units. Default = 10 (100ms)
// TXTail: Time to hold TX after FCS has been sent in 10ms units. Default = 0
// FullDuplex: 0 = Half Duplex. >0 = Full Duplex. Default = 0
// SetHardware: Custom
// Return: Exit Kiss

 typedef struct {
	uint8_t tx_delay;
	uint8_t persistence;
	uint8_t slot_time;
	uint8_t tx_tail;
	uint8_t full_duplex;
} tnc_settings_t;


typedef enum {
	ESC_MODE = 0,
	FRAME_ASS,
	FRAME_END,
} KISS_STATE_t;

typedef enum {
  FRAME_INVALID = 0, 
  FRAME_INCOMPLETE, 
  FRAME_COMPLETE,
} FRAME_STATUS_t; 

typedef struct {
	uint8_t 	buf[FRAME_BUFFER_SIZE];
	uint32_t 	max_len;
	uint32_t 	index;
  	FRAME_STATUS_t 	status;
} buffer_handle_t;

typedef struct {
	uint8_t *data;
	uint16_t len;
} raw_kiss_frame_t;

typedef struct {
	uint8_t *data;
	uint16_t len;
} raw_ax25_frame_t;

/* Public Functions */
void kiss_receive(uint8_t *data, uint16_t len);
void kiss_init(void);
void kiss_configure(void);



#endif /* MAIN_TNC_KISS_H_ */