dgtpicom_dgt3000.h

/* functions to communicate to a DGT3000 using I2C
 * version 0.8
 *
 * Copyright (C) 2015 DGT
 *
 * 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/>.
 */
 
#include <pthread.h>

/* return codes:
 *   -10= no direct access to memory, run as root
 *   -9 = receive failed, software buffer overrun, should not happen
 *   -8 = receive failed, Hardware buffer overrun, load to hi
 *   -7 = receive failed, CRC error, probably noise
 *   -6 = sending failed, hardware timeout, probably hardware fault
 *   -5 = sending failed, lines low, probably collision
 *   -4 = sending failed, clock stretch timeout, probably collision
 *   -3 = sending failed, no response, probably clock off
 *   -2 = no ack received
 *   -1 = negative ack received, 
 *    0 = succes!
 */
 

#define	ERROR_MEM		-10
#define	ERROR_SWB_FULL	-9
#define	ERROR_HWB_FULL	-8
#define	ERROR_CRC		-7
#define	ERROR_TIMEOUT	-6
#define	ERROR_LINES		-5
#define	ERROR_CST		-4
#define	ERROR_SILENT	-3
#define	ERROR_NOACK		-2
#define	ERROR_NACK		-1
#define	ERROR_OK		0
 


#define GPIO_BASE  0x200000
#define TIMER_BASE 0x003000
#define I2C_SLAVE_BASE 0x214000
#define I2C_MASTER_BASE 0x804000

#define SDA1IN (*gpioin & (1 << 2))    // SDA1 = GPIO 2
#define SCL1IN (*gpioin & (1 << 3))    // SCL1 = GPIO 3


// receive buffer length, longest package is program 51,
// debug can be modified in the future to max length of 255
#define RECEIVE_BUFFER_LENGTH 256

// enable debug pins
#ifdef debug
#define WAIT_FOR_FREE_BUS_PIN_HI *gpioset = (1 << 17)  // GPIO 17
#define WAIT_FOR_FREE_BUS_PIN_LO *gpioclr = (1 << 17)
#define RECEIVE_THREAD_RUNNING_PIN_HI *gpioset = (1 << 27)  // GPIO 27
#define RECEIVE_THREAD_RUNNING_PIN_LO *gpioclr = (1 << 27)
#define ERROR_PIN_HI *gpioset = (1 << 22)  // GPIO 22
#define ERROR_PIN_LO *gpioclr = (1 << 22)
#endif

// pointers to BCM2708/9 registers
volatile unsigned *gpio, *gpioset, *gpioclr, *gpioin;
volatile unsigned *i2cSlave, *i2cSlaveRSR, *i2cSlaveSLV, *i2cSlaveCR, *i2cSlaveFR;
volatile unsigned *i2cMaster, *i2cMasterS, *i2cMasterDLEN, *i2cMasterA, *i2cMasterFIFO, *i2cMasterDiv;
long long int *timer;

// variables for debug stats
#ifdef debug
typedef struct {
	int displaySF;
	int displayAF;
	int endDisplaySF;
	int endDisplayAF;
	int changeStateSF;
	int changeStateAF;
	int setCCSF;
	int setCCAF;
	int setNRunSF;
	int setNRunAF;

	int rxTimeout;
	int rxWrongAdr;
	int rxBufferFull;
	int rxSizeMismatch;
	int rxCRCFault;
	int rxMaxBuf;

	int sendTotal;

} debug_t;
debug_t bug;
//int wakes, setccs, resets, clears, clears2, hellos, hellos2, totals, overflows, maxs;
#endif

#define DGTRX_BUTTON_BUFFER_SIZE 16
typedef struct {
	char on;
	char ack[2];
	char hello;
	char buttonPres[DGTRX_BUTTON_BUFFER_SIZE];
	char buttonTime[DGTRX_BUTTON_BUFFER_SIZE];
	int buttonStart;
	int buttonEnd;
	long long int buttonRepeatTime;
	char buttonCount;
	char buttonState;
	char lastButtonState;
	char time[6];
	int error;
} dgtReceive_t;

dgtReceive_t dgtRx;

pthread_t receiveThread;
pthread_mutex_t receiveMutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t receiveCond = PTHREAD_COND_INITIALIZER;

char startMode = 0;

// I2C message descriptors
char ping[] = {80,32,5, 13, 70};
char centralControll[] = {16,32,5, 15, 72};
char mode25[] = {16,32,6,11,57,185};
char endDisplay[] = {16,32,5,7,112};
char noAutoMessage[] = {16,32,6,3,209,135};
char display[] = {16,32,21,6,32,32,32,32,32,32,32,32,32,32,32,255,0,3,0,0,0};
char setnrun[] = {16,32,12,10,0,1,0,0,1,0,1,0};

const char* packetDescriptor[] = {"Ack","Hello","Debug","Time","Button","Display","End Display","Current Program","Program","Set And Run","Change State","Send Hello","Ping","Time Correlation","Set Central Control","Release Central Control","Trigger Boot Loader"};

// pre-calculated CRC ATM-8 (x^8 + x^2 + x^1 + x^0)
const char crc_table[256] = {
    0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
    0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
    0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
    0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
    0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
    0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
    0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
    0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
    0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
    0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
    0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
    0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
    0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
    0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
    0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
    0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
    0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
    0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
    0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
    0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
    0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
    0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
    0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
    0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
    0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
    0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
    0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
    0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
    0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
    0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
    0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
    0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
};


//*** helping functions ***//

/* find out wich pi
	returns:
	0 = error
	1 = Pi b+
	2 = Pi 2 */
int checkPiModel();

/* calculate checksum and put it in the last byte
	*buffer = pointer to buffer */
char crc_calc(char *buffer);

/* print hex values
	bytes = array of bytes
	length is number of bytes to print */
void hexPrint(char bytes[], int length);


//*** Low level I2C communication ***//

/* configure IO pins and I2C Master and Slave
	*/
void i2cReset();

/* get message from I2C receive buffer
	m[] = message buffer of 256 bytes
	timeOut = time to wait for packet in us (0=dont wait)
	returns:
	-6 = CRC Error
	-5 = I2C buffer overrun, at least 16 bytes received succesfully. rest is missing.
	-4 = our buffer overrun (should not happen)
	-3 = timeout
	-2 = I2C Error
	>0 = packet length*/
int i2cReceive(char m[]);

/* send message using I2CMaster
	 message[] = the message to send
	 returns:
	 -7 = message not Acked, probably clock off
	 -3 = message not Acked, probably collision
	 -2 = I2C Error
	 0 = Succes */
int i2cSend(char message[], char ackAdr);



//*** dgt3000 commands ***//

/* send a wake command to the dgt3000
	returns:
	-3 = wake ack error
	-1 = no hello message received
	0 = succes */
int dgt3000Wake();

/* send set central controll command to dgt3000
	returns:
	-3 = sending failed, clock off (or collision)
	-2 = sending failed, I2C error
	-1 = no (positive)ack received, not in CC
	0 = succes */
int dgt3000SetCC();

/* send set mode 25 to dgt3000
	returns:
	-3 = sending failed, clock off (or collision)
	-2 = sending failed, I2C error
	-1 = no (positive)ack received, not in CC
	0 = succes */
int dgt3000Mode25();

/* send set and run command to dgt3000
     */
int dgt3000SetNRun(char srm[]);

/* send end display to dgt3000 to clear te display
	returns:
	-3 = sending failed, clock off (or collision)
	-2 = sending failed, I2C error
	-1 = no (positive)ack received, not in CC
	0 = succes */
int dgt3000EndDisplay();

/* send set display command to dgt3000
	dm = display message to send
	returns:
	-3 = sending failed, clock off (or collision)
	-2 = sending failed, I2C error
	-1 = no (positive)ack received, not in CC
	0 = succes */
int dgt3000Display(char dm[]);

/* check for messages from dgt3000
	returns:
	0 = nothing is received
	1 = something is received
	2 = off button message is received */
void *dgt3000Receive(void *);

/* wait for an Ack message
	adr = adress to listen for ack
	cmd = command to ack
	timeOut = time to wait for ack
	returns:
	-3 = no Ack
	0 = Ack */
int dgt3000GetAck(char adr, char cmd, long long int timeOut);