985323eefb
The version function requires device specific knowledge to use it (at least the required buffer size), it is already called internally when necessary, and only a few backends support it. Thus there is no good reason to keep it in the high-level public api.
519 lines
15 KiB
C
519 lines
15 KiB
C
/*
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* libdivecomputer
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*
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* Copyright (C) 2008 Jef Driesen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <string.h> // memcpy
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#include <stdlib.h> // malloc, free
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#include <libdivecomputer/oceanic_vtpro.h>
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#include "context-private.h"
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#include "device-private.h"
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#include "oceanic_common.h"
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#include "serial.h"
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#include "ringbuffer.h"
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#include "checksum.h"
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#define MAXRETRIES 2
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#define MULTIPAGE 4
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#define EXITCODE(rc) \
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( \
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rc == -1 ? DC_STATUS_IO : DC_STATUS_TIMEOUT \
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)
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#define ACK 0x5A
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#define NAK 0xA5
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#define END 0x51
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typedef struct oceanic_vtpro_device_t {
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oceanic_common_device_t base;
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serial_t *port;
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unsigned char version[PAGESIZE];
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} oceanic_vtpro_device_t;
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static dc_status_t oceanic_vtpro_device_read (dc_device_t *abstract, unsigned int address, unsigned char data[], unsigned int size);
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static dc_status_t oceanic_vtpro_device_close (dc_device_t *abstract);
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static const device_backend_t oceanic_vtpro_device_backend = {
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DC_FAMILY_OCEANIC_VTPRO,
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oceanic_common_device_set_fingerprint, /* set_fingerprint */
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oceanic_vtpro_device_read, /* read */
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NULL, /* write */
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oceanic_common_device_dump, /* dump */
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oceanic_common_device_foreach, /* foreach */
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oceanic_vtpro_device_close /* close */
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};
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static const unsigned char oceanic_vtpro_version[] = "VTPRO r\0\0 256K";
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static const unsigned char oceanic_wisdom_version[] = "WISDOM r\0\0 256K";
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static const oceanic_common_layout_t oceanic_vtpro_layout = {
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0x8000, /* memsize */
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0x0000, /* cf_devinfo */
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0x0040, /* cf_pointers */
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0x0240, /* rb_logbook_begin */
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0x0440, /* rb_logbook_end */
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8, /* rb_logbook_entry_size */
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0x0440, /* rb_profile_begin */
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0x8000, /* rb_profile_end */
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0, /* pt_mode_global */
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0 /* pt_mode_logbook */
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};
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static const oceanic_common_layout_t oceanic_wisdom_layout = {
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0x8000, /* memsize */
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0x0000, /* cf_devinfo */
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0x0040, /* cf_pointers */
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0x03D0, /* rb_logbook_begin */
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0x05D0, /* rb_logbook_end */
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8, /* rb_logbook_entry_size */
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0x05D0, /* rb_profile_begin */
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0x8000, /* rb_profile_end */
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0, /* pt_mode_global */
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0 /* pt_mode_logbook */
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};
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static int
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device_is_oceanic_vtpro (dc_device_t *abstract)
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{
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if (abstract == NULL)
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return 0;
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return abstract->backend == &oceanic_vtpro_device_backend;
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}
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static dc_status_t
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oceanic_vtpro_send (oceanic_vtpro_device_t *device, const unsigned char command[], unsigned int csize)
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{
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dc_device_t *abstract = (dc_device_t *) device;
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if (device_is_cancelled (abstract))
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return DC_STATUS_CANCELLED;
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// Send the command to the dive computer.
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int n = serial_write (device->port, command, csize);
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if (n != csize) {
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ERROR (abstract->context, "Failed to send the command.");
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return EXITCODE (n);
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}
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// Receive the response (ACK/NAK) of the dive computer.
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unsigned char response = NAK;
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n = serial_read (device->port, &response, 1);
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if (n != 1) {
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ERROR (abstract->context, "Failed to receive the answer.");
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return EXITCODE (n);
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}
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// Verify the response of the dive computer.
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if (response != ACK) {
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ERROR (abstract->context, "Unexpected answer start byte(s).");
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return DC_STATUS_PROTOCOL;
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}
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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oceanic_vtpro_transfer (oceanic_vtpro_device_t *device, const unsigned char command[], unsigned int csize, unsigned char answer[], unsigned int asize)
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{
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dc_device_t *abstract = (dc_device_t *) device;
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// Send the command to the device. If the device responds with an
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// ACK byte, the command was received successfully and the answer
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// (if any) follows after the ACK byte. If the device responds with
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// a NAK byte, we try to resend the command a number of times before
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// returning an error.
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unsigned int nretries = 0;
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dc_status_t rc = DC_STATUS_SUCCESS;
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while ((rc = oceanic_vtpro_send (device, command, csize)) != DC_STATUS_SUCCESS) {
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if (rc != DC_STATUS_TIMEOUT && rc != DC_STATUS_PROTOCOL)
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return rc;
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// Abort if the maximum number of retries is reached.
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if (nretries++ >= MAXRETRIES)
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return rc;
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}
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// Receive the answer of the dive computer.
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int n = serial_read (device->port, answer, asize);
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if (n != asize) {
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ERROR (abstract->context, "Failed to receive the answer.");
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return EXITCODE (n);
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}
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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oceanic_vtpro_init (oceanic_vtpro_device_t *device)
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{
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dc_device_t *abstract = (dc_device_t *) device;
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// Send the command to the dive computer.
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unsigned char command[2] = {0xAA, 0x00};
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int n = serial_write (device->port, command, sizeof (command));
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if (n != sizeof (command)) {
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ERROR (abstract->context, "Failed to send the command.");
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return EXITCODE (n);
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}
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// Receive the answer of the dive computer.
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unsigned char answer[13] = {0};
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n = serial_read (device->port, answer, sizeof (answer));
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if (n != sizeof (answer)) {
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ERROR (abstract->context, "Failed to receive the answer.");
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return EXITCODE (n);
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}
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// Verify the answer.
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const unsigned char response[13] = {
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0x4D, 0x4F, 0x44, 0x2D, 0x2D, 0x4F, 0x4B,
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0x5F, 0x56, 0x32, 0x2E, 0x30, 0x30};
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if (memcmp (answer, response, sizeof (response)) != 0) {
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ERROR (abstract->context, "Unexpected answer byte(s).");
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return DC_STATUS_PROTOCOL;
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}
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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oceanic_vtpro_quit (oceanic_vtpro_device_t *device)
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{
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dc_device_t *abstract = (dc_device_t *) device;
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// Send the command to the dive computer.
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unsigned char answer[1] = {0};
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unsigned char command[4] = {0x6A, 0x05, 0xA5, 0x00};
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dc_status_t rc = oceanic_vtpro_transfer (device, command, sizeof (command), answer, sizeof (answer));
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if (rc != DC_STATUS_SUCCESS)
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return rc;
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// Verify the last byte of the answer.
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if (answer[0] != END) {
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ERROR (abstract->context, "Unexpected answer byte(s).");
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return DC_STATUS_PROTOCOL;
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}
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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oceanic_vtpro_calibrate (oceanic_vtpro_device_t *device)
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{
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dc_device_t *abstract = (dc_device_t *) device;
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// Send the command to the dive computer.
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// The timeout is temporary increased, because the
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// device needs approximately 6 seconds to respond.
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unsigned char answer[2] = {0};
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unsigned char command[2] = {0x18, 0x00};
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serial_set_timeout (device->port, 9000);
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dc_status_t rc = oceanic_vtpro_transfer (device, command, sizeof (command), answer, sizeof (answer));
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serial_set_timeout (device->port, 3000);
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if (rc != DC_STATUS_SUCCESS)
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return rc;
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// Verify the last byte of the answer.
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if (answer[1] != 0x00) {
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ERROR (abstract->context, "Unexpected answer byte(s).");
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return DC_STATUS_PROTOCOL;
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}
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return DC_STATUS_SUCCESS;
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}
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dc_status_t
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oceanic_vtpro_device_open (dc_device_t **out, dc_context_t *context, const char *name)
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{
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if (out == NULL)
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return DC_STATUS_INVALIDARGS;
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// Allocate memory.
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oceanic_vtpro_device_t *device = (oceanic_vtpro_device_t *) malloc (sizeof (oceanic_vtpro_device_t));
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if (device == NULL) {
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ERROR (context, "Failed to allocate memory.");
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return DC_STATUS_NOMEMORY;
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}
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// Initialize the base class.
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oceanic_common_device_init (&device->base, context, &oceanic_vtpro_device_backend);
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// Override the base class values.
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device->base.multipage = MULTIPAGE;
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// Set the default values.
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device->port = NULL;
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memset (device->version, 0, sizeof (device->version));
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// Open the device.
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int rc = serial_open (&device->port, context, name);
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if (rc == -1) {
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ERROR (context, "Failed to open the serial port.");
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free (device);
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return DC_STATUS_IO;
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}
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// Set the serial communication protocol (9600 8N1).
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rc = serial_configure (device->port, 9600, 8, SERIAL_PARITY_NONE, 1, SERIAL_FLOWCONTROL_NONE);
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if (rc == -1) {
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ERROR (context, "Failed to set the terminal attributes.");
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serial_close (device->port);
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free (device);
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return DC_STATUS_IO;
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}
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// Set the timeout for receiving data (3000 ms).
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if (serial_set_timeout (device->port, 3000) == -1) {
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ERROR (context, "Failed to set the timeout.");
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serial_close (device->port);
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free (device);
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return DC_STATUS_IO;
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}
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// Set the DTR and RTS lines.
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if (serial_set_dtr (device->port, 1) == -1 ||
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serial_set_rts (device->port, 1) == -1) {
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ERROR (context, "Failed to set the DTR/RTS line.");
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serial_close (device->port);
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free (device);
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return DC_STATUS_IO;
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}
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// Give the interface 100 ms to settle and draw power up.
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serial_sleep (device->port, 100);
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// Make sure everything is in a sane state.
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serial_flush (device->port, SERIAL_QUEUE_BOTH);
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// Initialize the data cable (MOD mode).
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dc_status_t status = oceanic_vtpro_init (device);
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if (status != DC_STATUS_SUCCESS) {
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serial_close (device->port);
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free (device);
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return status;
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}
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// Switch the device from surface mode into download mode. Before sending
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// this command, the device needs to be in PC mode (manually activated by
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// the user), or already in download mode.
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status = oceanic_vtpro_device_version ((dc_device_t *) device, device->version, sizeof (device->version));
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if (status != DC_STATUS_SUCCESS) {
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serial_close (device->port);
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free (device);
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return status;
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}
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// Calibrate the device. Although calibration is optional, it's highly
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// recommended because it reduces the transfer time considerably, even
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// when processing the command itself is quite slow.
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status = oceanic_vtpro_calibrate (device);
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if (status != DC_STATUS_SUCCESS) {
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serial_close (device->port);
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free (device);
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return status;
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}
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// Override the base class values.
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if (oceanic_common_match (oceanic_wisdom_version, device->version, sizeof (device->version)))
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device->base.layout = &oceanic_wisdom_layout;
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else
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device->base.layout = &oceanic_vtpro_layout;
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*out = (dc_device_t*) device;
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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oceanic_vtpro_device_close (dc_device_t *abstract)
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{
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oceanic_vtpro_device_t *device = (oceanic_vtpro_device_t*) abstract;
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if (! device_is_oceanic_vtpro (abstract))
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return DC_STATUS_INVALIDARGS;
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// Switch the device back to surface mode.
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oceanic_vtpro_quit (device);
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// Close the device.
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if (serial_close (device->port) == -1) {
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free (device);
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return DC_STATUS_IO;
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}
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// Free memory.
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free (device);
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return DC_STATUS_SUCCESS;
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}
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dc_status_t
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oceanic_vtpro_device_keepalive (dc_device_t *abstract)
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{
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oceanic_vtpro_device_t *device = (oceanic_vtpro_device_t*) abstract;
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if (! device_is_oceanic_vtpro (abstract))
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return DC_STATUS_INVALIDARGS;
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// Send the command to the dive computer.
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unsigned char answer[1] = {0};
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unsigned char command[4] = {0x6A, 0x08, 0x00, 0x00};
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dc_status_t rc = oceanic_vtpro_transfer (device, command, sizeof (command), answer, sizeof (answer));
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if (rc != DC_STATUS_SUCCESS)
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return rc;
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// Verify the last byte of the answer.
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if (answer[0] != END) {
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ERROR (abstract->context, "Unexpected answer byte(s).");
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return DC_STATUS_PROTOCOL;
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}
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return DC_STATUS_SUCCESS;
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}
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dc_status_t
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oceanic_vtpro_device_version (dc_device_t *abstract, unsigned char data[], unsigned int size)
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{
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oceanic_vtpro_device_t *device = (oceanic_vtpro_device_t*) abstract;
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if (! device_is_oceanic_vtpro (abstract))
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return DC_STATUS_INVALIDARGS;
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if (size < PAGESIZE)
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return DC_STATUS_INVALIDARGS;
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// Switch the device into download mode. The response is ignored here,
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// since it is identical (except for the missing trailing byte) to the
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// response of the first part of the other command in this function.
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unsigned char cmd[2] = {0x88, 0x00};
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unsigned char ans[PAGESIZE / 2 + 1] = {0};
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dc_status_t rc = oceanic_vtpro_transfer (device, cmd, sizeof (cmd), ans, sizeof (ans));
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if (rc != DC_STATUS_SUCCESS)
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return rc;
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// Verify the checksum of the answer.
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unsigned char crc = ans[PAGESIZE / 2];
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unsigned char ccrc = checksum_add_uint4 (ans, PAGESIZE / 2, 0x00);
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if (crc != ccrc) {
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ERROR (abstract->context, "Unexpected answer checksum.");
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return DC_STATUS_PROTOCOL;
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}
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// Obtain the device identification string. This string is
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// split over two packets, but we join both parts again.
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for (unsigned int i = 0; i < 2; ++i) {
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unsigned char command[4] = {0x72, 0x03, i * 0x10, 0x00};
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unsigned char answer[PAGESIZE / 2 + 2] = {0};
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rc = oceanic_vtpro_transfer (device, command, sizeof (command), answer, sizeof (answer));
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if (rc != DC_STATUS_SUCCESS)
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return rc;
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// Verify the checksum of the answer.
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unsigned char crc = answer[PAGESIZE / 2];
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unsigned char ccrc = checksum_add_uint4 (answer, PAGESIZE / 2, 0x00);
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if (crc != ccrc) {
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ERROR (abstract->context, "Unexpected answer checksum.");
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return DC_STATUS_PROTOCOL;
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}
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// Verify the last byte of the answer.
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if (answer[PAGESIZE / 2 + 1] != END) {
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ERROR (abstract->context, "Unexpected answer byte.");
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return DC_STATUS_PROTOCOL;
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}
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// Append the answer to the output buffer.
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memcpy (data + i * PAGESIZE / 2, answer, PAGESIZE / 2);
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}
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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oceanic_vtpro_device_read (dc_device_t *abstract, unsigned int address, unsigned char data[], unsigned int size)
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{
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oceanic_vtpro_device_t *device = (oceanic_vtpro_device_t*) abstract;
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if (! device_is_oceanic_vtpro (abstract))
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return DC_STATUS_INVALIDARGS;
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if ((address % PAGESIZE != 0) ||
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(size % PAGESIZE != 0))
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return DC_STATUS_INVALIDARGS;
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unsigned int nbytes = 0;
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while (nbytes < size) {
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// Calculate the number of packages.
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unsigned int npackets = (size - nbytes) / PAGESIZE;
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if (npackets > MULTIPAGE)
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npackets = MULTIPAGE;
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// Read the package.
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unsigned int first = address / PAGESIZE;
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unsigned int last = first + npackets - 1;
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unsigned char answer[(PAGESIZE + 1) * MULTIPAGE] = {0};
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unsigned char command[6] = {0x34,
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(first >> 8) & 0xFF, // high
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(first ) & 0xFF, // low
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(last >> 8) & 0xFF, // high
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(last ) & 0xFF, // low
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0x00};
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dc_status_t rc = oceanic_vtpro_transfer (device, command, sizeof (command), answer, (PAGESIZE + 1) * npackets);
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if (rc != DC_STATUS_SUCCESS)
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return rc;
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unsigned int offset = 0;
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for (unsigned int i = 0; i < npackets; ++i) {
|
|
// Verify the checksum of the answer.
|
|
unsigned char crc = answer[offset + PAGESIZE];
|
|
unsigned char ccrc = checksum_add_uint8 (answer + offset, PAGESIZE, 0x00);
|
|
if (crc != ccrc) {
|
|
ERROR (abstract->context, "Unexpected answer checksum.");
|
|
return DC_STATUS_PROTOCOL;
|
|
}
|
|
|
|
memcpy (data, answer + offset, PAGESIZE);
|
|
|
|
offset += PAGESIZE + 1;
|
|
nbytes += PAGESIZE;
|
|
address += PAGESIZE;
|
|
data += PAGESIZE;
|
|
}
|
|
}
|
|
|
|
return DC_STATUS_SUCCESS;
|
|
}
|