Tooltron

#include "tool.h"

#include "tooltron_mb.h"

#include <modbus.h>

#include <stdio.h>

#include <errno.h>

#include <stdlib.h> // TODO temporary

modbus_t *ctx;

int tool_init_mb(const char *device) {

  ctx = modbus_new_rtu(device, MB_BAUD, 'N', 8, 1);

  if (ctx == NULL) {

    fprintf(stderr, "modbus_new_rtu: %s\n", modbus_strerror(errno));

    return 1;

  }

  if (modbus_connect(ctx) == -1) {

    fprintf(stderr, "modbus_connect: %s\n", modbus_strerror(errno));

    modbus_free(ctx);

    return 1;

  }

  return 0;

}

void tool_close_mb() {

  modbus_close(ctx);

  modbus_free(ctx);

}

static void tool_write_coil(int addr, int bit) {

  if (modbus_write_bit(ctx, addr, bit) == -1) {

    fprintf(stderr, "modbus_write_bit: %s\n", modbus_strerror(errno));

  }

}

static void tool_init(struct tool_t *tool) {

  // TODO write current limit values

  tool_write_coil(MB_COIL_INIT, 1);

  tool->state = TS_OFF;

}

static void tool_get_user(struct tool_t *tool) {

  unsigned short serno[2];

  if (modbus_read_registers(ctx, MB_INP_SERNOL, 2, serno) == -1) {

    fprintf(stderr, "modbus_read_registers: %s\n", modbus_strerror(errno));

    tool->user = 0;

  } else {

    tool->user = MODBUS_GET_INT32_FROM_INT16(serno, 0);

  }

}

static void tool_grant_access(struct tool_t *tool) {

  printf("Granting access to %08x on %s\n", tool->user, tool->name);

  tool_write_coil(MB_COIL_EN, 1);

}

static void tool_deny_access(struct tool_t *tool) {

  printf("Denying access to %08x on %s\n", tool->user, tool->name);

  tool_write_coil(MB_COIL_EN, 0);

}

void tool_request_disable(struct tool_t *tool) {

  printf("Requesting disable on %s\n", tool->name);

  tool_write_coil(MB_COIL_REQ_DIS, 1);

}

void tool_poll(struct tool_t *tool) {

  unsigned char status[N_COILS];

  if (modbus_set_slave(ctx, SLAVE_ADDR) == -1) {

    fprintf(stderr, "modbus_set_slave: %s\n", modbus_strerror(errno));

  }

  if (modbus_read_bits(ctx, 0, N_COILS, status) == -1) {

    fprintf(stderr, "modbus_read_bits: %s\n", modbus_strerror(errno));

    return;

  }

  if (!status[MB_COIL_INIT]) {

    tool->state = TS_INIT;

  }

  switch (tool->state) {

    case TS_INIT:

      tool_init(tool);

      break;

    case TS_OFF:

      if (status[MB_COIL_NEW]) {

        tool_get_user(tool);

        // TODO check actual credentials

        if (rand() & 1) {

          tool_grant_access(tool);

        } else {

          tool_deny_access(tool);

        }

      }

      break;

    case TS_ON:

      if (!status[MB_COIL_EN]) {

        printf("Tool %s is off\n", tool->name);

        tool->state = TS_OFF;

      }

      break;

    case TS_REQ_DIS:

      if (!status[MB_COIL_EN]) {

        printf("Tool %s is off after requested disable\n", tool->name);

        tool->state = TS_OFF;

      }

      break;

  }

}