gpib.h

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#ifndef _GPIB_H_
#define _GPIB_H_
 
#include "user_config.h"
#include "hal.h"
#include "gpib_hal.h"
#include "posix.h"
 
#define GPIB_BUS_SETTLE_DELAY 2
//#define GPIB_BUS_SETTLE_DELAY 5
#define HTIMEOUT (500000L / GPIB_TASK_TIC_US)
 
#define EOI_FLAG 0x0100
#define SRQ_FLAG 0x0200
#define ATN_FLAG 0x0400
#define REN_FLAG 0x0800
#define IFC_FLAG 0x1000
 
#define PP_FLAG         0x2000
#define TIMEOUT_FLAG    0x4000
#define BUS_ERROR_FLAG  0x8000
 
#define DAV_FLAG        0x2000
#define NRFD_FLAG       0x4000
#define NDAC_FLAG       0x8000
 
#define ERROR_MASK (IFC_FLAG | TIMEOUT_FLAG | BUS_ERROR_FLAG)
#define CONTROL_MASK (EOI_FLAG | SRQ_FLAG | ATN_FLAG | REN_FLAG)
 
#define DATA_MASK   0x00ff
#define CMD_MASK    0x007f
#define STATUS_MASK 0xff00
 
enum
{
    TRACE_DISABLE,                                // normal read
    TRACE_READ,                                   // trace read
    TRACE_BUS                                     // trace bus handshake
};
 
#define TRACE_ALL   1                             /* trace all bus states durring a read */
#define NO_TRACE    0                             /* do not trace bus states durring a read */
 
enum
{
    GPIB_RX_START = 0,
    GPIB_RX_WAIT_FOR_DAV_LOW,
    GPIB_RX_DAV_IS_LOW,
    GPIB_RX_WAIT_FOR_NDAC_HI,
    GPIB_RX_WAIT_FOR_DAV_HI,
    GPIB_RX_DAV_IS_HI,
    GPIB_RX_FINISH,
    GPIB_RX_ERROR,
    GPIB_RX_DONE
};
 
enum
{
    GPIB_TX_START = 0,
    GPIB_TX_WAIT_FOR_NRFD_OR_NDAC_LOW,
    GPIB_TX_PUT_DATA,
    GPIB_TX_WAIT_FOR_NRFD_HI,
    GPIB_TX_SET_DAV_LOW,
    GPIB_TX_WAIT_FOR_NDAC_HI,
    GPIB_TX_SET_DAV_HI,
    GPIB_TX_FINISH,
    GPIB_TX_ERROR,
    GPIB_TX_DONE
};
 
enum
{
    GPIB_PP_IDLE = 0,
    GPIB_PP_DETECTED
};
 
#define GPIB_IOBUFF_LEN     512                   /* Max length of RX/TX GPIB string */
extern uint8_t gpib_iobuff[GPIB_IOBUFF_LEN];
 
extern int debuglevel;
 
extern uint8_t talk31;
extern uint8_t talking;
extern uint8_t talking_last;
extern uint8_t listening;
extern uint8_t listening_last;
extern uint8_t spoll;
extern uint16_t current,lastcmd;
extern uint8_t secondary;
extern uint8_t device;
 
 
/* gpib.c */
void gpib_timer_elapsed_begin ( void );
void gpib_timer_reset ( void );
void gpib_timer_elapsed_end ( char *msg );
void gpib_timer_task ( void );
void gpib_timeout_set ( uint32_t time );
uint8_t gpib_timeout_test ( void );
void gpib_bus_init ( void );
void gpib_rx_init ( uint8_t busy );
void gpib_tx_init ( void );
void gpib_state_init ( void );
void gpib_enable_PPR ( int bit );
void gpib_disable_PPR ( int bit );
uint8_t gpib_detect_PP ( void );
uint16_t gpib_unread ( uint16_t ch );
uint8_t gpib_bus_read ( void );
uint16_t gpib_control_pin_read ( void );
uint16_t gpib_handshake_pin_read ( void );
uint16_t gpib_write_byte ( uint16_t ch );
uint16_t gpib_read_byte ( int trace );
void gpib_decode_header ( FILE *fo );
void gpib_trace_display ( uint16_t status , int trace_state );
void gpib_decode ( uint16_t ch );
int gpib_read_str ( uint8_t *buf , int size , uint16_t *status );
int gpib_write_str ( uint8_t *buf , int size , uint16_t *status );
 
#endif                                            // GPIB_H_