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osmo-fl2k/src/libosmo-fl2k.c

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/*
* osmo-fl2k, turns FL2000-based USB 3.0 to VGA adapters into
* low cost DACs
*
* Copyright (C) 2016-2020 by Steve Markgraf <steve@steve-m.de>
*
* SPDX-License-Identifier: GPL-2.0+
*
* 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 2 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 <errno.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <libusb.h>
#include <pthread.h>
#ifndef _WIN32
#include <unistd.h>
#define sleep_ms(ms) usleep(ms*1000)
#else
#include <windows.h>
#define sleep_ms(ms) Sleep(ms)
#endif
/*
* All libusb callback functions should be marked with the LIBUSB_CALL macro
* to ensure that they are compiled with the same calling convention as libusb.
*
* If the macro isn't available in older libusb versions, we simply define it.
*/
#ifndef LIBUSB_CALL
#define LIBUSB_CALL
#endif
/* libusb < 1.0.9 doesn't have libusb_handle_events_timeout_completed */
#ifndef HAVE_LIBUSB_HANDLE_EVENTS_TIMEOUT_COMPLETED
#define libusb_handle_events_timeout_completed(ctx, tv, c) \
libusb_handle_events_timeout(ctx, tv)
#endif
#include "osmo-fl2k.h"
enum fl2k_async_status {
FL2K_INACTIVE = 0,
FL2K_CANCELING,
FL2K_RUNNING
};
typedef enum fl2k_buf_state {
BUF_EMPTY = 0,
BUF_SUBMITTED,
BUF_FILLED,
} fl2k_buf_state_t;
typedef struct fl2k_xfer_info {
fl2k_dev_t *dev;
uint64_t seq;
fl2k_buf_state_t state;
} fl2k_xfer_info_t;
struct fl2k_dev {
libusb_context *ctx;
struct libusb_device_handle *devh;
uint32_t xfer_num;
uint32_t xfer_buf_num;
uint32_t xfer_buf_len;
struct libusb_transfer **xfer;
unsigned char **xfer_buf;
fl2k_xfer_info_t *xfer_info;
fl2k_tx_cb_t cb;
void *cb_ctx;
enum fl2k_async_status async_status;
int async_cancel;
int use_zerocopy;
int terminate;
/* thread related */
pthread_t usb_worker_thread;
pthread_t sample_worker_thread;
pthread_mutex_t buf_mutex;
pthread_cond_t buf_cond;
double rate; /* Hz */
/* status */
int dev_lost;
int driver_active;
uint32_t underflow_cnt;
};
typedef struct fl2k_dongle {
uint16_t vid;
uint16_t pid;
const char *name;
} fl2k_dongle_t;
static fl2k_dongle_t known_devices[] = {
{ 0x1d5c, 0x2000, "FL2000DX OEM" },
};
#define DEFAULT_BUF_NUMBER 4
#define CTRL_IN (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN)
#define CTRL_OUT (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT)
#define CTRL_TIMEOUT 300
#define BULK_TIMEOUT 0
static int fl2k_read_reg(fl2k_dev_t *dev, uint16_t reg, uint32_t *val)
{
int r;
uint8_t data[4];
if (!dev || !val)
return FL2K_ERROR_INVALID_PARAM;
r = libusb_control_transfer(dev->devh, CTRL_IN, 0x40,
0, reg, data, 4, CTRL_TIMEOUT);
if (r < 4)
fprintf(stderr, "Error, short read from register!\n");
*val = (data[3] << 24) | (data[2] << 16) | (data[1] << 8) | data[0];
return r;
}
static int fl2k_write_reg(fl2k_dev_t *dev, uint16_t reg, uint32_t val)
{
uint8_t data[4];
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
data[0] = val & 0xff;
data[1] = (val >> 8) & 0xff;
data[2] = (val >> 16) & 0xff;
data[3] = (val >> 24) & 0xff;
return libusb_control_transfer(dev->devh, CTRL_OUT, 0x41,
0, reg, data, 4, CTRL_TIMEOUT);
}
int fl2k_init_device(fl2k_dev_t *dev)
{
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
/* initialization */
fl2k_write_reg(dev, 0x8020, 0xdf0000cc);
/* set DAC freq to lowest value possible to avoid
* underrun during init */
fl2k_write_reg(dev, 0x802c, 0x00416f3f);
fl2k_write_reg(dev, 0x8048, 0x7ffb8004);
fl2k_write_reg(dev, 0x803c, 0xd701004d);
fl2k_write_reg(dev, 0x8004, 0x0000031c);
fl2k_write_reg(dev, 0x8004, 0x0010039d);
fl2k_write_reg(dev, 0x8008, 0x07800898);
fl2k_write_reg(dev, 0x801c, 0x00000000);
fl2k_write_reg(dev, 0x0070, 0x04186085);
/* blanking magic */
fl2k_write_reg(dev, 0x8008, 0xfeff0780);
fl2k_write_reg(dev, 0x800c, 0x0000f001);
/* VSYNC magic */
fl2k_write_reg(dev, 0x8010, 0x0400042a);
fl2k_write_reg(dev, 0x8014, 0x0010002d);
fl2k_write_reg(dev, 0x8004, 0x00000002);
return 0;
}
int fl2k_deinit_device(fl2k_dev_t *dev)
{
int r = 0;
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
/* TODO, power down DACs, PLL, put device in reset */
return r;
}
static double fl2k_reg_to_freq(uint32_t reg)
{
double sample_clock, offset, offs_div;
uint32_t pll_clock = 160000000;
uint8_t div = reg & 0x3f;
uint8_t out_div = (reg >> 8) & 0xf;
uint8_t frac = (reg >> 16) & 0xf;
uint8_t mult = (reg >> 20) & 0xf;
sample_clock = (pll_clock * mult) / (uint32_t)div;
offs_div = (pll_clock / 5.0f ) * mult;
offset = ((double)sample_clock/(offs_div/2)) * 1000000.0f;
sample_clock += (uint32_t)offset * frac;
sample_clock /= out_div;
// fprintf(stderr, "div: %d\tod: %d\tfrac: %d\tmult %d\tclock: %f\treg "
// "%08x\n", div, out_div, frac, mult, sample_clock, reg);
return sample_clock;
}
int fl2k_set_sample_rate(fl2k_dev_t *dev, uint32_t target_freq)
{
double sample_clock, error, last_error = 1e20f;
uint32_t reg = 0, result_reg = 0;
uint8_t div, mult, frac, out_div;
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
/* Output divider (accepts value 1-15)
* works, but adds lots of phase noise, so do not use it */
out_div = 1;
/* Observation: PLL multiplier of 7 works, but has more phase
* noise. Prefer multiplier 6 and 5 */
for (mult = 6; mult >= 3; mult--) {
for (div = 63; div > 1; div--) {
for (frac = 1; frac <= 15; frac++) {
reg = (mult << 20) | (frac << 16) |
(0x60 << 8) | (out_div << 8) | div;
sample_clock = fl2k_reg_to_freq(reg);
error = sample_clock - (double)target_freq;
/* Keep closest match */
if (fabs(error) < last_error) {
result_reg = reg;
last_error = fabs(error);
}
}
}
}
sample_clock = fl2k_reg_to_freq(result_reg);
error = sample_clock - (double)target_freq;
dev->rate = sample_clock;
if (fabs(error) > 1)
fprintf(stderr, "Requested sample rate %d not possible, using"
" %f, error is %f\n", target_freq, sample_clock, error);
return fl2k_write_reg(dev, 0x802c, result_reg);
}
uint32_t fl2k_get_sample_rate(fl2k_dev_t *dev)
{
if (!dev)
return 0;
return (uint32_t)dev->rate;
}
static fl2k_dongle_t *find_known_device(uint16_t vid, uint16_t pid)
{
unsigned int i;
fl2k_dongle_t *device = NULL;
for (i = 0; i < sizeof(known_devices)/sizeof(fl2k_dongle_t); i++ ) {
if (known_devices[i].vid == vid && known_devices[i].pid == pid) {
device = &known_devices[i];
break;
}
}
return device;
}
uint32_t fl2k_get_device_count(void)
{
int i,r;
libusb_context *ctx;
libusb_device **list;
uint32_t device_count = 0;
struct libusb_device_descriptor dd;
ssize_t cnt;
r = libusb_init(&ctx);
if (r < 0)
return 0;
cnt = libusb_get_device_list(ctx, &list);
for (i = 0; i < cnt; i++) {
libusb_get_device_descriptor(list[i], &dd);
if (find_known_device(dd.idVendor, dd.idProduct))
device_count++;
}
libusb_free_device_list(list, 1);
libusb_exit(ctx);
return device_count;
}
const char *fl2k_get_device_name(uint32_t index)
{
int i,r;
libusb_context *ctx;
libusb_device **list;
struct libusb_device_descriptor dd;
fl2k_dongle_t *device = NULL;
uint32_t device_count = 0;
ssize_t cnt;
r = libusb_init(&ctx);
if (r < 0)
return "";
cnt = libusb_get_device_list(ctx, &list);
for (i = 0; i < cnt; i++) {
libusb_get_device_descriptor(list[i], &dd);
device = find_known_device(dd.idVendor, dd.idProduct);
if (device) {
device_count++;
if (index == device_count - 1)
break;
}
}
libusb_free_device_list(list, 1);
libusb_exit(ctx);
if (device)
return device->name;
else
return "";
}
int fl2k_open(fl2k_dev_t **out_dev, uint32_t index)
{
int r;
int i;
libusb_device **list;
fl2k_dev_t *dev = NULL;
libusb_device *device = NULL;
uint32_t device_count = 0;
struct libusb_device_descriptor dd;
uint8_t reg;
ssize_t cnt;
dev = malloc(sizeof(fl2k_dev_t));
if (NULL == dev)
return -ENOMEM;
memset(dev, 0, sizeof(fl2k_dev_t));
r = libusb_init(&dev->ctx);
if(r < 0){
free(dev);
return -1;
}
#if LIBUSB_API_VERSION >= 0x01000106
libusb_set_option(dev->ctx, LIBUSB_OPTION_LOG_LEVEL, 3);
#else
libusb_set_debug(dev->ctx, 3);
#endif
dev->dev_lost = 1;
cnt = libusb_get_device_list(dev->ctx, &list);
for (i = 0; i < cnt; i++) {
device = list[i];
libusb_get_device_descriptor(list[i], &dd);
if (find_known_device(dd.idVendor, dd.idProduct)) {
device_count++;
}
if (index == device_count - 1)
break;
device = NULL;
}
if (!device) {
r = -1;
goto err;
}
r = libusb_open(device, &dev->devh);
libusb_free_device_list(list, 1);
if (r < 0) {
fprintf(stderr, "usb_open error %d\n", r);
if(r == LIBUSB_ERROR_ACCESS)
fprintf(stderr, "Please fix the device permissions, e.g. "
"by installing the udev rules file\n");
goto err;
}
/* If the adapter has an SPI flash for the Windows driver, we
* need to detach the USB mass storage driver first in order to
* open the device */
if (libusb_kernel_driver_active(dev->devh, 3) == 1) {
fprintf(stderr, "Kernel mass storage driver is attached, "
"detaching driver. This may take more than"
" 10 seconds!\n");
r = libusb_detach_kernel_driver(dev->devh, 3);
if (r < 0) {
fprintf(stderr, "Failed to detach mass storage "
"driver: %d\n", r);
goto err;
}
}
r = libusb_claim_interface(dev->devh, 0);
if (r < 0) {
fprintf(stderr, "usb_claim_interface 0 error %d\n", r);
goto err;
}
r = libusb_set_interface_alt_setting(dev->devh, 0, 1);
if (r < 0) {
fprintf(stderr, "Failed to switch interface 0 to "
"altsetting 1, trying to use interface 1\n");
r = libusb_claim_interface(dev->devh, 1);
if (r < 0) {
fprintf(stderr, "Could not claim interface 1: %d\n", r);
}
}
r = fl2k_init_device(dev);
if (r < 0)
goto err;
dev->dev_lost = 0;
found:
*out_dev = dev;
return 0;
err:
if (dev) {
if (dev->ctx)
libusb_exit(dev->ctx);
free(dev);
}
return r;
}
int fl2k_close(fl2k_dev_t *dev)
{
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
if(!dev->dev_lost) {
/* block until all async operations have been completed (if any) */
while (FL2K_INACTIVE != dev->async_status)
sleep_ms(100);
fl2k_deinit_device(dev);
}
libusb_release_interface(dev->devh, 0);
libusb_close(dev->devh);
libusb_exit(dev->ctx);
free(dev);
return 0;
}
static struct libusb_transfer *fl2k_get_next_xfer(fl2k_dev_t *dev,
fl2k_buf_state_t state)
{
unsigned int i;
int next_buf = -1;
uint64_t next_seq = 0;
fl2k_xfer_info_t *xfer_info;
for (i = 0; i < dev->xfer_buf_num; i++) {
xfer_info = (fl2k_xfer_info_t *)dev->xfer[i]->user_data;
if (!xfer_info)
continue;
if (xfer_info->state == state) {
if (state == BUF_EMPTY) {
return dev->xfer[i];
} else if ((xfer_info->seq < next_seq) || next_buf < 0) {
next_seq = xfer_info->seq;
next_buf = i;
}
}
}
if ((state == BUF_FILLED) && (next_buf >= 0))
return dev->xfer[next_buf];
else
return NULL;
}
static void LIBUSB_CALL _libusb_callback(struct libusb_transfer *xfer)
{
fl2k_xfer_info_t *xfer_info = (fl2k_xfer_info_t *)xfer->user_data;
fl2k_xfer_info_t *next_xfer_info;
fl2k_dev_t *dev = (fl2k_dev_t *)xfer_info->dev;
struct libusb_transfer *next_xfer = NULL;
int r = 0;
if (LIBUSB_TRANSFER_COMPLETED == xfer->status) {
/* resubmit transfer */
if (FL2K_RUNNING == dev->async_status) {
/* get next transfer */
next_xfer = fl2k_get_next_xfer(dev, BUF_FILLED);
if (next_xfer) {
next_xfer_info = (fl2k_xfer_info_t *) next_xfer->user_data;
/* Submit next filled transfer */
next_xfer_info->state = BUF_SUBMITTED;
r = libusb_submit_transfer(next_xfer);
xfer_info->state = BUF_EMPTY;
pthread_cond_signal(&dev->buf_cond);
} else {
/* We need to re-submit the transfer
* in any case, as otherwise the device
* stops to output data and hangs
* (happens only in the hacked 'gapless'
* mode without HSYNC and VSYNC) */
r = libusb_submit_transfer(xfer);
pthread_cond_signal(&dev->buf_cond);
dev->underflow_cnt++;
}
}
}
if (((LIBUSB_TRANSFER_CANCELLED != xfer->status) &&
(LIBUSB_TRANSFER_COMPLETED != xfer->status)) ||
(r == LIBUSB_ERROR_NO_DEVICE)) {
dev->dev_lost = 1;
fl2k_stop_tx(dev);
pthread_cond_signal(&dev->buf_cond);
fprintf(stderr, "cb transfer status: %d, submit "
"transfer %d, canceling...\n", xfer->status, r);
}
}
static int fl2k_alloc_submit_transfers(fl2k_dev_t *dev)
{
unsigned int i;
int r = 0;
const char *incr_usbfs = "Please increase your allowed usbfs buffer"
" size with the following command:\n"
"echo 0 > /sys/module/usbcore/parameters/"
"usbfs_memory_mb\n";
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
dev->xfer = malloc(dev->xfer_buf_num * sizeof(struct libusb_transfer *));
for (i = 0; i < dev->xfer_buf_num; ++i)
dev->xfer[i] = libusb_alloc_transfer(0);
dev->xfer_buf = malloc(dev->xfer_buf_num * sizeof(unsigned char *));
memset(dev->xfer_buf, 0, dev->xfer_buf_num * sizeof(unsigned char *));
dev->xfer_info = malloc(dev->xfer_buf_num * sizeof(fl2k_xfer_info_t));
memset(dev->xfer_info, 0, dev->xfer_buf_num * sizeof(fl2k_xfer_info_t));
#if defined (__linux__) && LIBUSB_API_VERSION >= 0x01000105
fprintf(stderr, "Allocating %d zero-copy buffers\n", dev->xfer_buf_num);
dev->use_zerocopy = 1;
for (i = 0; i < dev->xfer_buf_num; ++i) {
dev->xfer_buf[i] = libusb_dev_mem_alloc(dev->devh, dev->xfer_buf_len);
if (dev->xfer_buf[i]) {
/* Check if Kernel usbfs mmap() bug is present: if the
* mapping is correct, the buffers point to memory that
* was memset to 0 by the Kernel, otherwise, they point
* to random memory. We check if the buffers are zeroed
* and otherwise fall back to buffers in userspace.
*/
if (dev->xfer_buf[i][0] || memcmp(dev->xfer_buf[i],
dev->xfer_buf[i] + 1,
dev->xfer_buf_len - 1)) {
fprintf(stderr, "Detected Kernel usbfs mmap() "
"bug, falling back to buffers "
"in userspace\n");
dev->use_zerocopy = 0;
break;
}
} else {
fprintf(stderr, "Failed to allocate zero-copy "
"buffer for transfer %d\n%sFalling "
"back to buffers in userspace\n",
i, incr_usbfs);
dev->use_zerocopy = 0;
break;
}
}
/* zero-copy buffer allocation failed (partially or completely)
* we need to free the buffers again if already allocated */
if (!dev->use_zerocopy) {
for (i = 0; i < dev->xfer_buf_num; ++i) {
if (dev->xfer_buf[i])
libusb_dev_mem_free(dev->devh,
dev->xfer_buf[i],
dev->xfer_buf_len);
}
}
#endif
/* no zero-copy available, allocate buffers in userspace */
if (!dev->use_zerocopy) {
for (i = 0; i < dev->xfer_buf_num; ++i) {
dev->xfer_buf[i] = malloc(dev->xfer_buf_len);
if (!dev->xfer_buf[i])
return FL2K_ERROR_NO_MEM;
}
}
/* fill transfers */
for (i = 0; i < dev->xfer_buf_num; ++i) {
libusb_fill_bulk_transfer(dev->xfer[i],
dev->devh,
0x01,
dev->xfer_buf[i],
dev->xfer_buf_len,
_libusb_callback,
&dev->xfer_info[i],
0);
dev->xfer_info[i].dev = dev;
dev->xfer_info[i].state = BUF_EMPTY;
/* if we allocate the memory through the Kernel, it is
* already cleared */
if (!dev->use_zerocopy)
memset(dev->xfer_buf[i], 0, dev->xfer_buf_len);
}
/* submit transfers */
for (i = 0; i < dev->xfer_num; ++i) {
r = libusb_submit_transfer(dev->xfer[i]);
dev->xfer_info[i].state = BUF_SUBMITTED;
if (r < 0) {
fprintf(stderr, "Failed to submit transfer %i\n%s",
i, incr_usbfs);
break;
}
}
return 0;
}
static int _fl2k_free_async_buffers(fl2k_dev_t *dev)
{
unsigned int i;
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
if (dev->xfer) {
for (i = 0; i < dev->xfer_buf_num; ++i) {
if (dev->xfer[i]) {
libusb_free_transfer(dev->xfer[i]);
}
}
free(dev->xfer);
dev->xfer = NULL;
}
if (dev->xfer_buf) {
for (i = 0; i < dev->xfer_buf_num; ++i) {
if (dev->xfer_buf[i]) {
if (dev->use_zerocopy) {
#if defined (__linux__) && LIBUSB_API_VERSION >= 0x01000105
libusb_dev_mem_free(dev->devh,
dev->xfer_buf[i],
dev->xfer_buf_len);
#endif
} else {
free(dev->xfer_buf[i]);
}
}
}
free(dev->xfer_buf);
dev->xfer_buf = NULL;
}
return 0;
}
static void *fl2k_usb_worker(void *arg)
{
fl2k_dev_t *dev = (fl2k_dev_t *)arg;
struct timeval tv = { 1, 0 };
struct timeval zerotv = { 0, 0 };
enum fl2k_async_status next_status = FL2K_INACTIVE;
int r = 0;
unsigned int i;
while (FL2K_RUNNING == dev->async_status) {
r = libusb_handle_events_timeout_completed(dev->ctx, &tv,
&dev->async_cancel);
}
while (FL2K_INACTIVE != dev->async_status) {
r = libusb_handle_events_timeout_completed(dev->ctx, &tv,
&dev->async_cancel);
if (r < 0) {
/*fprintf(stderr, "handle_events returned: %d\n", r);*/
if (r == LIBUSB_ERROR_INTERRUPTED) /* stray signal */
continue;
break;
}
if (FL2K_CANCELING == dev->async_status) {
next_status = FL2K_INACTIVE;
if (!dev->xfer)
break;
for (i = 0; i < dev->xfer_buf_num; ++i) {
if (!dev->xfer[i])
continue;
if (LIBUSB_TRANSFER_CANCELLED !=
dev->xfer[i]->status) {
r = libusb_cancel_transfer(dev->xfer[i]);
/* handle events after canceling
* to allow transfer status to
* propagate */
libusb_handle_events_timeout_completed(dev->ctx,
&zerotv, NULL);
if (r < 0)
continue;
next_status = FL2K_CANCELING;
}
}
if (dev->dev_lost || FL2K_INACTIVE == next_status) {
/* handle any events that still need to
* be handled before exiting after we
* just cancelled all transfers */
libusb_handle_events_timeout_completed(dev->ctx,
&zerotv, NULL);
break;
}
}
}
/* wake up sample worker */
pthread_cond_signal(&dev->buf_cond);
/* wait for sample worker thread to finish before freeing buffers */
pthread_join(dev->sample_worker_thread, NULL);
_fl2k_free_async_buffers(dev);
dev->async_status = next_status;
pthread_exit(NULL);
}
/* Buffer format conversion functions for R, G, B DACs */
static inline void fl2k_convert_r(char *out,
char *in,
uint32_t len,
uint8_t offset)
{
unsigned int i, j = 0;
if (!in || !out)
return;
for (i = 0; i < len; i += 24) {
out[i+ 6] = in[j++] + offset;
out[i+ 1] = in[j++] + offset;
out[i+12] = in[j++] + offset;
out[i+15] = in[j++] + offset;
out[i+10] = in[j++] + offset;
out[i+21] = in[j++] + offset;
out[i+16] = in[j++] + offset;
out[i+19] = in[j++] + offset;
}
}
static inline void fl2k_convert_g(char *out,
char *in,
uint32_t len,
uint8_t offset)
{
unsigned int i, j = 0;
if (!in || !out)
return;
for (i = 0; i < len; i += 24) {
out[i+ 5] = in[j++] + offset;
out[i+ 0] = in[j++] + offset;
out[i+ 3] = in[j++] + offset;
out[i+14] = in[j++] + offset;
out[i+ 9] = in[j++] + offset;
out[i+20] = in[j++] + offset;
out[i+23] = in[j++] + offset;
out[i+18] = in[j++] + offset;
}
}
static inline void fl2k_convert_b(char *out,
char *in,
uint32_t len,
uint8_t offset)
{
unsigned int i, j = 0;
if (!in || !out)
return;
for (i = 0; i < len; i += 24) {
out[i+ 4] = in[j++] + offset;
out[i+ 7] = in[j++] + offset;
out[i+ 2] = in[j++] + offset;
out[i+13] = in[j++] + offset;
out[i+ 8] = in[j++] + offset;
out[i+11] = in[j++] + offset;
out[i+22] = in[j++] + offset;
out[i+17] = in[j++] + offset;
}
}
static void *fl2k_sample_worker(void *arg)
{
int r = 0;
unsigned int i, j;
fl2k_dev_t *dev = (fl2k_dev_t *)arg;
fl2k_xfer_info_t *xfer_info = NULL;
struct libusb_transfer *xfer = NULL;
char *out_buf = NULL;
fl2k_data_info_t data_info;
uint32_t underflows = 0;
uint64_t buf_cnt = 0;
while (FL2K_RUNNING == dev->async_status) {
memset(&data_info, 0, sizeof(fl2k_data_info_t));
data_info.len = FL2K_BUF_LEN;
data_info.underflow_cnt = dev->underflow_cnt;
data_info.ctx = dev->cb_ctx;
if (dev->underflow_cnt > underflows) {
fprintf(stderr, "Underflow! Skipped %d buffers\n",
dev->underflow_cnt - underflows);
underflows = dev->underflow_cnt;
}
/* call application callback to get samples */
if (dev->cb)
dev->cb(&data_info);
xfer = fl2k_get_next_xfer(dev, BUF_EMPTY);
if (!xfer) {
pthread_cond_wait(&dev->buf_cond, &dev->buf_mutex);
/* in the meantime, the device might be gone */
if (FL2K_RUNNING != dev->async_status)
break;
xfer = fl2k_get_next_xfer(dev, BUF_EMPTY);
if (!xfer) {
fprintf(stderr, "no free transfer, skipping"
" input buffer\n");
continue;
}
}
/* We have an empty USB transfer buffer */
xfer_info = (fl2k_xfer_info_t *)xfer->user_data;
out_buf = (char *)xfer->buffer;
/* Re-arrange and copy bytes in buffer for DACs */
fl2k_convert_r(out_buf, data_info.r_buf, dev->xfer_buf_len,
data_info.sampletype_signed ? 128 : 0);
fl2k_convert_g(out_buf, data_info.g_buf, dev->xfer_buf_len,
data_info.sampletype_signed ? 128 : 0);
fl2k_convert_b(out_buf, data_info.b_buf, dev->xfer_buf_len,
data_info.sampletype_signed ? 128 : 0);
xfer_info->seq = buf_cnt++;
xfer_info->state = BUF_FILLED;
}
/* notify application if we've lost the device */
if (dev->dev_lost && dev->cb) {
data_info.device_error = 1;
dev->cb(&data_info);
}
pthread_exit(NULL);
}
int fl2k_start_tx(fl2k_dev_t *dev, fl2k_tx_cb_t cb, void *ctx,
uint32_t buf_num)
{
int r = 0;
int i;
pthread_attr_t attr;
if (!dev || !cb)
return FL2K_ERROR_INVALID_PARAM;
dev->async_status = FL2K_RUNNING;
dev->async_cancel = 0;
dev->cb = cb;
dev->cb_ctx = ctx;
if (buf_num > 0)
dev->xfer_num = buf_num;
else
dev->xfer_num = DEFAULT_BUF_NUMBER;
/* have two spare buffers that can be filled while the
* others are submitted */
dev->xfer_buf_num = dev->xfer_num + 2;
dev->xfer_buf_len = FL2K_XFER_LEN;
r = fl2k_alloc_submit_transfers(dev);
if (r < 0)
goto cleanup;
pthread_mutex_init(&dev->buf_mutex, NULL);
pthread_cond_init(&dev->buf_cond, NULL);
pthread_attr_init(&attr);
r = pthread_create(&dev->usb_worker_thread, &attr,
fl2k_usb_worker, (void *)dev);
if (r < 0) {
fprintf(stderr, "Error spawning USB worker thread!\n");
goto cleanup;
}
r = pthread_create(&dev->sample_worker_thread, &attr,
fl2k_sample_worker, (void *)dev);
if (r < 0) {
fprintf(stderr, "Error spawning sample worker thread!\n");
goto cleanup;
}
pthread_attr_destroy(&attr);
return 0;
cleanup:
_fl2k_free_async_buffers(dev);
return FL2K_ERROR_BUSY;
}
int fl2k_stop_tx(fl2k_dev_t *dev)
{
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
/* if streaming, try to cancel gracefully */
if (FL2K_RUNNING == dev->async_status) {
dev->async_status = FL2K_CANCELING;
dev->async_cancel = 1;
return 0;
/* if called while in pending state, change the state forcefully */
} else if (FL2K_INACTIVE != dev->async_status) {
dev->async_status = FL2K_INACTIVE;
return 0;
}
return FL2K_ERROR_BUSY;
}
int fl2k_i2c_read(fl2k_dev_t *dev, uint8_t i2c_addr, uint8_t reg_addr, uint8_t *data)
{
int i, r, timeout = 1;
uint32_t reg;
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
r = fl2k_read_reg(dev, 0x8020, &reg);
if (r < 0)
return r;
/* apply mask, clearing bit 30 disables periodic repetition of read */
reg &= 0x3ffc0000;
/* set I2C register and address, select I2C read (bit 7) */
reg |= (1 << 28) | (reg_addr << 8) | (1 << 7) | (i2c_addr & 0x7f);
r = fl2k_write_reg(dev, 0x8020, reg);
if (r < 0)
return r;
for (i = 0; i < 10; i++) {
sleep_ms(10);
r = fl2k_read_reg(dev, 0x8020, &reg);
if (r < 0)
return r;
/* check if operation completed */
if (reg & (1 << 31)) {
timeout = 0;
break;
}
}
if (timeout)
return FL2K_ERROR_TIMEOUT;
/* check if slave responded and all data was read */
if (reg & (0x0f << 24))
return FL2K_ERROR_NOT_FOUND;
/* read data from register 0x8024 */
return libusb_control_transfer(dev->devh, CTRL_IN, 0x40,
0, 0x8024, data, 4, CTRL_TIMEOUT);
}
int fl2k_i2c_write(fl2k_dev_t *dev, uint8_t i2c_addr, uint8_t reg_addr, uint8_t *data)
{
int i, r, timeout = 1;
uint32_t reg;
if (!dev)
return FL2K_ERROR_INVALID_PARAM;
/* write data to register 0x8028 */
r = libusb_control_transfer(dev->devh, CTRL_OUT, 0x41,
0, 0x8028, data, 4, CTRL_TIMEOUT);
if (r < 0)
return r;
r = fl2k_read_reg(dev, 0x8020, &reg);
if (r < 0)
return r;
/* apply mask, clearing bit 30 disables periodic repetition of read */
reg &= 0x3ffc0000;
/* set I2C register and address */
reg |= (1 << 28) | (reg_addr << 8) | (i2c_addr & 0x7f);
r = fl2k_write_reg(dev, 0x8020, reg);
if (r < 0)
return r;
for (i = 0; i < 10; i++) {
sleep_ms(10);
r = fl2k_read_reg(dev, 0x8020, &reg);
if (r < 0)
return r;
/* check if operation completed */
if (reg & (1 << 31)) {
timeout = 0;
break;
}
}
if (timeout)
return FL2K_ERROR_TIMEOUT;
/* check if slave responded and all data was written */
if (reg & (0x0f << 24))
return FL2K_ERROR_NOT_FOUND;
return FL2K_SUCCESS;
}
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