|
- /*
- * Labjack Tools
- * Copyright (c) 2003-2007 Jim Paris <jim@jtan.com>
- *
- * This is free software; you can redistribute it and/or modify it and
- * it is provided under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation; see COPYING.
- */
-
- #include <errno.h>
- #include <stdint.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <string.h>
- #include <sys/types.h>
- #include <math.h>
-
- #include "netutil.h"
- #include "compat.h"
-
- #include "debug.h"
- #include "ue9.h"
- #include "ue9error.h"
- #include "util.h"
- #include "netutil.h"
- #include "ethstream.h"
-
- /* Fill checksums in data buffers, with "normal" checksum format */
- void ue9_checksum_normal(uint8_t * buffer, size_t len)
- {
- uint16_t sum = 0;
-
- if (len < 1) {
- fprintf(stderr, "ue9_checksum_normal: len too short\n");
- exit(1);
- }
-
- while (--len >= 1)
- sum += (uint16_t) buffer[len];
- sum = (sum / 256) + (sum % 256);
- sum = (sum / 256) + (sum % 256);
- buffer[0] = (uint8_t) sum;
- }
-
- /* Fill checksums in data buffers, with "extended" checksum format */
- void ue9_checksum_extended(uint8_t * buffer, size_t len)
- {
- uint16_t sum = 0;
-
- if (len < 6) {
- fprintf(stderr, "ue9_checksum_extended: len too short\n");
- exit(1);
- }
-
- /* 16-bit extended checksum */
- while (--len >= 6)
- sum += (uint16_t) buffer[len];
- buffer[4] = (uint8_t) (sum & 0xff);
- buffer[5] = (uint8_t) (sum >> 8);
-
- /* 8-bit normal checksum over first 6 bytes */
- ue9_checksum_normal(buffer, 6);
- }
-
- /* Verify checksums in data buffers, with "normal" checksum format. */
- int ue9_verify_normal(uint8_t * buffer, size_t len)
- {
- uint8_t saved, new;
-
- if (len < 1) {
- fprintf(stderr, "ue9_verify_normal: len too short\n");
- exit(1);
- }
-
- saved = buffer[0];
- ue9_checksum_normal(buffer, len);
- new = buffer[0];
- buffer[0] = saved;
-
- if (new != saved) {
- verb("got %02x, expected %02x\n", saved, new);
- return 0;
- }
-
- return 1;
- }
-
- /* Verify checksums in data buffers, with "extended" checksum format. */
- int ue9_verify_extended(uint8_t * buffer, size_t len)
- {
- uint8_t saved[3], new[3];
-
- if (len < 6) {
- fprintf(stderr, "ue9_verify_extended: len too short\n");
- exit(1);
- }
-
- saved[0] = buffer[0];
- saved[1] = buffer[4];
- saved[2] = buffer[5];
- ue9_checksum_extended(buffer, len);
- new[0] = buffer[0];
- new[1] = buffer[4];
- new[2] = buffer[5];
- buffer[0] = saved[0];
- buffer[4] = saved[1];
- buffer[5] = saved[2];
-
- if (saved[0] != new[0] || saved[1] != new[1] || saved[2] != new[2]) {
- verb("got %02x %02x %02x, expected %02x %02x %02x\n",
- saved[0], saved[1], saved[2], new[0], new[1], new[2]);
- return 0;
- }
-
- return 1;
- }
-
- /* Data conversion. If calib is NULL, use uncalibrated conversions. */
- double
- ue9_binary_to_analog(struct ue9Calibration *calib,
- int gain, uint8_t resolution, uint16_t data)
- {
- double slope = 0, offset;
-
- if (calib == NULL) {
- double uncal[9] = { 5.08, 2.54, 1.27, 0.63, 0, 0, 0, 0, 10.25 };
- if (gain >= ARRAY_SIZE(uncal) || uncal[gain] == 0) {
- fprintf(stderr, "ue9_binary_to_analog: bad gain\n");
- exit(1);
- }
- return data * uncal[gain] / 65536.0;
- }
-
- if (resolution < 18) {
- switch (gain) {
- case 1:
- slope = calib->unipolarSlope[0];
- offset = calib->unipolarOffset[0];
- break;
- case 2:
- slope = calib->unipolarSlope[1];
- offset = calib->unipolarOffset[1];
- break;
- case 4:
- slope = calib->unipolarSlope[2];
- offset = calib->unipolarOffset[2];
- break;
- case 8:
- slope = calib->unipolarSlope[3];
- offset = calib->unipolarOffset[3];
- break;
- default:
- slope = calib->bipolarSlope;
- offset = calib->bipolarOffset;
- }
- } else {
- if (gain == 0) {
- slope = calib->hiResUnipolarSlope;
- offset = calib->hiResUnipolarOffset;
- } else if (gain == 8) {
- slope = calib->hiResBipolarSlope;
- offset = calib->hiResBipolarOffset;
- }
- }
-
- if (slope == 0) {
- fprintf(stderr, "ue9_binary_to_analog: bad gain\n");
- exit(1);
- }
-
- return data * slope + offset;
- }
-
- /* Execute a command on the UE9. Returns -1 on error. Fills the
- checksums on the outgoing packets, and verifies them on the
- incoming packets. Data in "out" is transmitted, data in "in" is
- received. */
- int ue9_command(int fd, uint8_t * out, uint8_t * in, int inlen)
- {
- int extended = 0, outlen;
- uint8_t saved_1, saved_3;
- ssize_t ret;
-
- if ((out[1] & 0x78) == 0x78)
- extended = 1;
-
- /* Figure out length of data payload, and fill checksums. */
- if (extended) {
- outlen = 6 + (out[2]) * 2;
- ue9_checksum_extended(out, outlen);
- } else {
- outlen = 2 + (out[1] & 7) * 2;
- ue9_checksum_normal(out, outlen);
- }
-
- /* Send request */
- ret = send_all_timeout(fd, out, outlen, 0, &(struct timeval) {
- .tv_sec = TIMEOUT});
- if (ret < 0 || ret != outlen) {
- verb("short send %d\n", (int)ret);
- return -1;
- }
-
- /* Save a few bytes that we'll want to compare against later,
- in case the caller passed the same buffer twice. */
- saved_1 = out[1];
- if (extended)
- saved_3 = out[3];
-
- /* Receive result */
- ret = recv_all_timeout(fd, in, inlen, 0, &(struct timeval) {
- .tv_sec = TIMEOUT});
- if (ret < 0 || ret != inlen) {
- verb("short recv %d\n", (int)ret);
- return -1;
- }
-
- /* Verify it */
- if ((in[1] & 0xF8) != (saved_1 & 0xF8))
- verb("returned command doesn't match\n");
- else if (extended && (in[3] != saved_3))
- verb("extended command doesn't match\n");
- else if (extended && (inlen != (6 + (in[2]) * 2)))
- verb("returned extended data is the wrong len\n");
- else if (!extended && (inlen != (2 + (in[1] & 7) * 2)))
- verb("returned data is the wrong len\n");
- else if (extended && !ue9_verify_extended(in, inlen))
- verb("extended checksum is invalid\n");
- else if (!ue9_verify_normal(in, extended ? 6 : inlen))
- verb("normal checksum is invalid\n");
- else
- return 0; /* looks good */
-
- return -1;
- }
-
- /* Read a memory block from the device. Returns -1 on error. */
- int ue9_memory_read(int fd, int blocknum, uint8_t * buffer, int len)
- {
- uint8_t sendbuf[8], recvbuf[136];
-
- if (len != 128) {
- fprintf(stderr, "ue9_memory_read: buffer length must be 128\n");
- exit(1);
- }
-
- /* Request memory block */
- sendbuf[1] = 0xf8;
- sendbuf[2] = 0x01;
- sendbuf[3] = 0x2a;
- sendbuf[6] = 0x00;
- sendbuf[7] = blocknum;
-
- if (ue9_command(fd, sendbuf, recvbuf, sizeof(recvbuf)) < 0) {
- verb("command failed\n");
- return -1;
- }
-
- /* Got it */
- memcpy(buffer, recvbuf + 8, len);
-
- return 0;
- }
-
- /* Convert 64-bit fixed point to double type */
- double ue9_fp64_to_double(uint8_t * data)
- {
- int32_t a;
- uint32_t b;
-
- a = (data[7] << 24) | (data[6] << 16) | (data[5] << 8) | data[4];
- b = (data[3] << 24) | (data[2] << 16) | (data[1] << 8) | data[0];
-
- return (double)a + (double)b / (double)4294967296.0L;
- }
-
- /* Retrieve calibration data from the device. Returns -1 on error. */
- int ue9_get_calibration(int fd, struct ue9Calibration *calib)
- {
- uint8_t buf[128];
-
- /* Block 0 */
- if (ue9_memory_read(fd, 0, buf, 128) < 0)
- return -1;
- calib->unipolarSlope[0] = ue9_fp64_to_double(buf + 0);
- calib->unipolarOffset[0] = ue9_fp64_to_double(buf + 8);
- calib->unipolarSlope[1] = ue9_fp64_to_double(buf + 16);
- calib->unipolarOffset[1] = ue9_fp64_to_double(buf + 24);
- calib->unipolarSlope[2] = ue9_fp64_to_double(buf + 32);
- calib->unipolarOffset[2] = ue9_fp64_to_double(buf + 40);
- calib->unipolarSlope[3] = ue9_fp64_to_double(buf + 48);
- calib->unipolarOffset[3] = ue9_fp64_to_double(buf + 56);
-
- /* Block 1 */
- if (ue9_memory_read(fd, 1, buf, 128) < 0)
- return -1;
- calib->bipolarSlope = ue9_fp64_to_double(buf + 0);
- calib->bipolarOffset = ue9_fp64_to_double(buf + 8);
-
- /* Block 2 */
- if (ue9_memory_read(fd, 2, buf, 128) < 0)
- return -1;
- calib->DACSlope[0] = ue9_fp64_to_double(buf + 0);
- calib->DACOffset[0] = ue9_fp64_to_double(buf + 8);
- calib->DACSlope[1] = ue9_fp64_to_double(buf + 16);
- calib->DACOffset[1] = ue9_fp64_to_double(buf + 24);
- calib->tempSlope = ue9_fp64_to_double(buf + 32);
- calib->tempSlopeLow = ue9_fp64_to_double(buf + 48);
- calib->calTemp = ue9_fp64_to_double(buf + 64);
- calib->Vref = ue9_fp64_to_double(buf + 72);
- calib->VrefDiv2 = ue9_fp64_to_double(buf + 88);
- calib->VsSlope = ue9_fp64_to_double(buf + 96);
-
- /* Block 3 */
- if (ue9_memory_read(fd, 3, buf, 128) < 0)
- return -1;
- calib->hiResUnipolarSlope = ue9_fp64_to_double(buf + 0);
- calib->hiResUnipolarOffset = ue9_fp64_to_double(buf + 8);
-
- /* Block 4 */
- if (ue9_memory_read(fd, 4, buf, 128) < 0)
- return -1;
- calib->hiResBipolarSlope = ue9_fp64_to_double(buf + 0);
- calib->hiResBipolarOffset = ue9_fp64_to_double(buf + 8);
-
- /* All done */
- return 1;
- }
-
- /* Retrieve comm config, returns -1 on error */
- int ue9_get_comm_config(int fd, struct ue9CommConfig *config)
- {
- uint8_t sendbuf[18];
- uint8_t recvbuf[24];
-
- memset(sendbuf, 0, sizeof(sendbuf));
- memset(config, 0, sizeof(struct ue9CommConfig));
-
- sendbuf[1] = 0xf8;
- sendbuf[2] = 0x09;
- sendbuf[3] = 0x08;
- if (ue9_command(fd, sendbuf, recvbuf, sizeof(recvbuf)) < 0) {
- verb("command failed\n");
- return -1;
- }
- verb("todo\n");
- return -1;
- }
-
- /* Retrieve control config, returns -1 on error */
- int ue9_get_control_config(int fd, struct ue9ControlConfig *config)
- {
- uint8_t sendbuf[18];
- uint8_t recvbuf[24];
-
- memset(sendbuf, 0, sizeof(sendbuf));
- memset(config, 0, sizeof(struct ue9ControlConfig));
-
- sendbuf[1] = 0xf8;
- sendbuf[2] = 0x06;
- sendbuf[3] = 0x08;
- if (ue9_command(fd, sendbuf, recvbuf, sizeof(recvbuf)) < 0) {
- verb("command failed\n");
- return -1;
- }
- verb("todo\n");
- return -1;
- }
-
- /* Open TCP/IP connection to the UE9 */
- int ue9_open(const char *host, int port)
- {
- int fd;
- struct sockaddr_in address;
- struct hostent *he;
- int window_size = 128 * 1024;
-
- net_init();
-
- /* Create socket */
- fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
- if (fd < 0) {
- verb("socket returned %d\n", fd);
- return -1;
- }
-
- /* Set nonblocking */
- if (soblock(fd, 0) < 0) {
- verb("can't set nonblocking\n");
- return -1;
- }
-
- /* Set initial window size hint to workaround LabJack firmware bug */
- setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (void *)&window_size,
- sizeof(window_size));
- setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (void *)&window_size,
- sizeof(window_size));
-
- /* Resolve host */
- address.sin_family = AF_INET;
- address.sin_port = htons(port);
- he = gethostbyname(host);
- if (he == NULL) {
- verb("gethostbyname(\"%s\") failed\n", host);
- return -1;
- }
- address.sin_addr = *((struct in_addr *)he->h_addr);
-
- debug("Resolved %s -> %s\n", host, inet_ntoa(address.sin_addr));
-
- /* Connect */
- if (connect_timeout(fd, (struct sockaddr *)&address, sizeof(address),
- &(struct timeval) {
- .tv_sec = TIMEOUT}) < 0) {
- verb("connection to %s:%d failed: %s\n",
- inet_ntoa(address.sin_addr), port, compat_strerror(errno));
- return -1;
- }
-
- debug("Connected to port %d\n", port);
-
- return fd;
- }
-
- /* Close connection to the UE9 */
- void ue9_close(int fd)
- {
- /* does anyone actually call shutdown these days? */
- shutdown(fd, 2 /* SHUT_RDWR */ );
- close(fd);
- }
-
- /* Compute scanrate based on the provided values. */
- double ue9_compute_rate(uint8_t scanconfig, uint16_t scaninterval)
- {
- double clock;
-
- /* A "scan" is across all channels. Each scan is triggered at
- a fixed rate, and not affected by the number of channels.
- Channels are scanned as quickly as possible. */
-
- switch ((scanconfig >> 3) & 3) {
- case 0:
- clock = 4e6;
- break;
- case 1:
- clock = 48e6;
- break;
- case 2:
- clock = 750e3;
- break;
- case 3:
- clock = 24e6;
- break;
- }
-
- if (scanconfig & 0x2)
- clock /= 256;
-
- if (scaninterval == 0)
- return 0;
-
- return clock / scaninterval;
- }
-
- /* Choose the best ScanConfig and ScanInterval parameters for the
- desired scanrate. Returns -1 if no valid config found */
- int
- ue9_choose_scan(double desired_rate, double *actual_rate,
- uint8_t * scanconfig, uint16_t * scaninterval)
- {
- int i;
- struct {
- double clock;
- uint8_t config;
- } valid[] = {
- {
- 48e6, 0x08}, {
- 24e6, 0x18}, {
- 4e6, 0x00}, {
- 750e3, 0x10}, {
- 48e6 / 256, 0x0a}, {
- 24e6 / 256, 0x1a}, {
- 4e6 / 256, 0x02}, {
- 750e3 / 256, 0x12}, {
- 0, 0}};
-
- /* Start with the fastest clock frequency. If the
- scaninterval would be too large, knock it down until it
- fits. */
- for (i = 0; valid[i].clock != 0; i++) {
- double interval = valid[i].clock / desired_rate;
-
- debug("Considering clock %lf (interval %lf)\n",
- valid[i].clock, interval);
-
- if (interval >= 0.5 && interval < 65535.5) {
-
- *scaninterval = floor(interval + 0.5);
-
- *scanconfig = valid[i].config;
- *actual_rate =
- ue9_compute_rate(*scanconfig, *scaninterval);
-
- debug("Config 0x%02x, desired %lf, actual %lf\n",
- *scanconfig, desired_rate, *actual_rate);
-
- return 0;
- }
- }
-
- return -1;
- }
-
- /* Flush data buffers */
- void ue9_buffer_flush(int fd)
- {
- uint8_t sendbuf[2], recvbuf[2];
-
- sendbuf[1] = 0x08; /* FlushBuffer */
-
- if (ue9_command(fd, sendbuf, recvbuf, sizeof(recvbuf)) < 0) {
- verb("command failed\n");
- }
- }
-
- /* Stop stream. Returns < 0 on failure. */
- int ue9_stream_stop(int fd)
- {
- uint8_t sendbuf[2], recvbuf[4];
-
- sendbuf[1] = 0xB0;
-
- if (ue9_command(fd, sendbuf, recvbuf, sizeof(recvbuf)) < 0) {
- verb("command failed\n");
- return -1;
- }
-
- if (recvbuf[2] == STREAM_NOT_RUNNING || recvbuf[2] == 0)
- return 0;
-
- debug("error %s\n", ue9_error(recvbuf[2]));
- return -recvbuf[2];
- }
-
- /* Start stream. Returns < 0 on failure. */
- int ue9_stream_start(int fd)
- {
- uint8_t sendbuf[2], recvbuf[4];
-
- sendbuf[1] = 0xA8;
-
- if (ue9_command(fd, sendbuf, recvbuf, sizeof(recvbuf)) < 0) {
- verb("command failed\n");
- return -1;
- }
-
- if (recvbuf[2] == 0)
- return 0;
-
- debug("error %s\n", ue9_error(recvbuf[2]));
- return -recvbuf[2];
- }
-
- /* "Simple" stream configuration, assumes the channels are all
- configured with the same gain. */
- int
- ue9_streamconfig_simple(int fd, int *channel_list, int channel_count,
- uint8_t scanconfig, uint16_t scaninterval, uint8_t gain)
- {
- int i;
- uint8_t buf[256];
-
- /* Set up StreamConfig command with channels and scan options */
- buf[1] = 0xF8; /* Extended command */
- buf[2] = channel_count + 3; /* Command data words */
- buf[3] = 0x11; /* StreamConfig */
- buf[6] = channel_count; /* Number of channels */
- buf[7] = 12; /* Bit resolution */
- buf[8] = 0; /* Extra settling time */
- buf[9] = scanconfig;
- buf[10] = scaninterval & 0xff;
- buf[11] = scaninterval >> 8;
-
- for (i = 0; i < channel_count; i++) {
- buf[12 + 2 * i] = channel_list[i]; /* Channel number */
- buf[13 + 2 * i] = gain; /* Gain/bipolar setup */
- }
-
- /* Send StreamConfig */
- if (ue9_command(fd, buf, buf, 8) < 0) {
- debug("command failed\n");
- return -1;
- }
-
- if (buf[6] != 0) {
- verb("returned error %s\n", ue9_error(buf[6]));
- return -1;
- }
-
- return 0;
- }
-
- /* Stream configuration, each Analog Input channel can have its own gain. */
- int
- ue9_streamconfig(int fd, int *channel_list, int channel_count,
- uint8_t scanconfig, uint16_t scaninterval, int *gain_list, int gain_count)
- {
- int i;
- uint8_t buf[256];
-
- /* Set up StreamConfig command with channels and scan options */
- buf[1] = 0xF8; /* Extended command */
- buf[2] = channel_count + 3; /* Command data words */
- buf[3] = 0x11; /* StreamConfig */
- buf[6] = channel_count; /* Number of channels */
- buf[7] = 12; /* Bit resolution */
- buf[8] = 0; /* Extra settling time */
- buf[9] = scanconfig;
- buf[10] = scaninterval & 0xff;
- buf[11] = scaninterval >> 8;
-
- for (i = 0; i < channel_count; i++) {
- buf[12 + 2 * i] = channel_list[i]; /* Channel number */
- if (i < gain_count) {
- switch (gain_list[i]) {
- case 0:
- buf[13 + 2 * i] = UE9_BIPOLAR_GAIN1;
- break;
-
- case 1:
- buf[13 + 2 * i] = UE9_UNIPOLAR_GAIN1;
- break;
-
- case 2:
- buf[13 + 2 * i] = UE9_UNIPOLAR_GAIN2;
- break;
-
- case 4:
- buf[13 + 2 * i] = UE9_UNIPOLAR_GAIN4;
- break;
-
- case 8:
- buf[13 + 2 * i] = UE9_UNIPOLAR_GAIN8;
- break;
-
- default:
- buf[13 + 2 * i] = UE9_BIPOLAR_GAIN1;
- }
- }
- else
- {
- buf[13 + 2 * i] = UE9_BIPOLAR_GAIN1;
- }
- }
-
- /* Send StreamConfig */
- if (ue9_command(fd, buf, buf, 8) < 0) {
- debug("command failed\n");
- return -1;
- }
-
- if (buf[6] != 0) {
- verb("returned error %s\n", ue9_error(buf[6]));
- return -1;
- }
-
- return 0;
- }
-
-
- /* Timer configuration */
- int ue9_timer_config(int fd, int *mode_list, int mode_count, int divisor)
- {
- int i;
- uint8_t buf[256];
-
- if (mode_count < 0 || mode_count > 6) {
- verb("invalid count\n");
- return -1;
- }
-
- /* Set up TimerConfig command */
- buf[1] = 0xF8; /* Extended command */
- buf[2] = 0x0C; /* Command data words */
- buf[3] = 0x18; /* TimerConfig */
- buf[6] = divisor; /* TimerClockDivisor */
- buf[7] = 0x80 | mode_count; /* Number of timers enabled, UpdateConfig=1 */
- buf[8] = 0x01; /* TimerClockBase = System 48MHz */
- buf[9] = 0x00; /* Don't reset */
-
- for (i = 0; i < 6; i++) {
- if (i < mode_count)
- buf[10 + 3 * i] = mode_list[i];
- else
- buf[10 + 3 * i] = 0;
- buf[11 + 3 * i] = 0;
- buf[12 + 3 * i] = 0;
- }
-
- buf[28] = 0;
- buf[29] = 0;
-
- /* Send StreamConfig */
- if (ue9_command(fd, buf, buf, 40) < 0) {
- debug("command failed\n");
- return -1;
- }
-
- if (buf[6] != 0) {
- verb("returned error %s\n", ue9_error(buf[6]));
- return -1;
- }
-
- debug("timer EnableStatus=0x%02x\n", buf[7]);
-
- return 0;
- }
-
- /* Stream data and pass it to the data callback. If callback returns
- negative, stops reading and returns 0. Returns < 0 on error. */
- int
- ue9_stream_data(int fd, int channels, int *channel_list, int gain_count, int *gain_list, ue9_stream_cb_t callback, void *context)
- {
- int ret;
- uint8_t buf[46];
- uint8_t packet = 0;
- int channel = 0;
- int i;
- uint16_t data[channels];
-
- for (;;) {
- /* Receive data */
- ret = recv_all_timeout(fd, buf, 46, 0, &(struct timeval) {
- .tv_sec = TIMEOUT});
-
- /* Verify packet format */
- if (ret != 46) {
- verb("short recv %d\n", (int)ret);
- return -1;
- }
-
- if (!ue9_verify_extended(buf, 46) || !ue9_verify_normal(buf, 6)) {
- verb("bad checksum\n");
- return -2;
- }
-
- if (buf[1] != 0xF9 || buf[2] != 0x14 || buf[3] != 0xC0) {
- verb("bad command bytes\n");
- return -3;
- }
-
- if (buf[11] != 0) {
- verb("stream error: %s\n", ue9_error(buf[11]));
- return -4;
- }
-
- /* Check for dropped packets. */
- if (buf[10] != packet) {
- verb("expected packet %d, but received packet %d\n",
- packet, buf[10]);
- return -5;
- }
- packet++;
-
- /* Check comm processor backlog (up to 512 kB) */
- if (buf[45] & 0x80) {
- verb("buffer overflow in CommBacklog, aborting\n");
- return -6;
- }
- if ((buf[45] & 0x7f) > 112)
- debug("warning: CommBacklog is high (%d bytes)\n",
- (buf[45] & 0x7f) * 4096);
-
- /* Check control processor backlog (up to 256 bytes). */
- if (buf[44] == 255) {
- verb("ControlBacklog is maxed out, aborting\n");
- return -7;
- }
- if (buf[44] > 224)
- debug("warning: ControlBacklog is high (%d bytes)\n",
- buf[44]);
-
- /* Read samples from the buffer */
- for (i = 12; i <= 42; i += 2) {
- data[channel++] = buf[i] + (buf[i + 1] << 8);
- if (channel < channels)
- continue;
-
- /* Received a full scan, send to callback */
- channel = 0;
- if ((*callback) (channels, channel_list, gain_count, gain_list, data, context) < 0) {
- /* We're done */
- return 0;
- }
- }
- }
- }
-
- /*
- Local variables:
- c-basic-offset: 2
- End:
- */
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