|
- /**************************************************************************
- * Copyright (C) 2012 by Andreas Fritiofson *
- * andreas.fritiofson@gmail.com *
- * *
- * 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, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
-
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include "mpsse.h"
- #include "helper/log.h"
- #include <libusb-1.0/libusb.h>
-
- /* Compatibility define for older libusb-1.0 */
- #ifndef LIBUSB_CALL
- #define LIBUSB_CALL
- #endif
-
- #ifdef _DEBUG_JTAG_IO_
- #define DEBUG_IO(expr...) LOG_DEBUG(expr)
- #define DEBUG_PRINT_BUF(buf, len) \
- do { \
- char buf_string[32 * 3 + 1]; \
- int buf_string_pos = 0; \
- for (int i = 0; i < len; i++) { \
- buf_string_pos += sprintf(buf_string + buf_string_pos, " %02x", buf[i]); \
- if (i % 32 == 32 - 1) { \
- LOG_DEBUG("%s", buf_string); \
- buf_string_pos = 0; \
- } \
- } \
- if (buf_string_pos > 0) \
- LOG_DEBUG("%s", buf_string);\
- } while (0)
- #else
- #define DEBUG_IO(expr...) do {} while (0)
- #define DEBUG_PRINT_BUF(buf, len) do {} while (0)
- #endif
-
- #define FTDI_DEVICE_OUT_REQTYPE (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE)
- #define FTDI_DEVICE_IN_REQTYPE (0x80 | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE)
-
- #define BITMODE_MPSSE 0x02
-
- #define SIO_RESET_REQUEST 0x00
- #define SIO_SET_LATENCY_TIMER_REQUEST 0x09
- #define SIO_GET_LATENCY_TIMER_REQUEST 0x0A
- #define SIO_SET_BITMODE_REQUEST 0x0B
-
- #define SIO_RESET_SIO 0
- #define SIO_RESET_PURGE_RX 1
- #define SIO_RESET_PURGE_TX 2
-
- struct mpsse_ctx {
- libusb_context *usb_ctx;
- libusb_device_handle *usb_dev;
- unsigned int usb_write_timeout;
- unsigned int usb_read_timeout;
- uint8_t in_ep;
- uint8_t out_ep;
- uint16_t max_packet_size;
- uint16_t index;
- uint8_t interface;
- enum ftdi_chip_type type;
- uint8_t *write_buffer;
- unsigned write_size;
- unsigned write_count;
- uint8_t *read_buffer;
- unsigned read_size;
- unsigned read_count;
- uint8_t *read_chunk;
- unsigned read_chunk_size;
- struct bit_copy_queue read_queue;
- };
-
- /* Returns true if the string descriptor indexed by str_index in device matches string */
- static bool string_descriptor_equal(libusb_device_handle *device, uint8_t str_index,
- const char *string)
- {
- int retval;
- char desc_string[256]; /* Max size of string descriptor */
- retval = libusb_get_string_descriptor_ascii(device, str_index, (unsigned char *)desc_string,
- sizeof(desc_string));
- if (retval < 0) {
- LOG_ERROR("libusb_get_string_descriptor_ascii() failed with %d", retval);
- return false;
- }
- return strncmp(string, desc_string, sizeof(desc_string)) == 0;
- }
-
- /* Helper to open a libusb device that matches vid, pid, product string and/or serial string.
- * Set any field to 0 as a wildcard. If the device is found true is returned, with ctx containing
- * the already opened handle. ctx->interface must be set to the desired interface (channel) number
- * prior to calling this function. */
- static bool open_matching_device(struct mpsse_ctx *ctx, const uint16_t *vid, const uint16_t *pid,
- const char *product, const char *serial)
- {
- libusb_device **list;
- struct libusb_device_descriptor desc;
- struct libusb_config_descriptor *config0;
- int err;
- bool found = false;
- ssize_t cnt = libusb_get_device_list(ctx->usb_ctx, &list);
- if (cnt < 0)
- LOG_ERROR("libusb_get_device_list() failed with %zi", cnt);
-
- for (ssize_t i = 0; i < cnt; i++) {
- libusb_device *device = list[i];
-
- err = libusb_get_device_descriptor(device, &desc);
- if (err != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_get_device_descriptor() failed with %d", err);
- continue;
- }
-
- if (vid && *vid != desc.idVendor)
- continue;
- if (pid && *pid != desc.idProduct)
- continue;
-
- err = libusb_open(device, &ctx->usb_dev);
- if (err != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_open() failed with %d", err);
- continue;
- }
-
- if (product && !string_descriptor_equal(ctx->usb_dev, desc.iProduct, product)) {
- libusb_close(ctx->usb_dev);
- continue;
- }
-
- if (serial && !string_descriptor_equal(ctx->usb_dev, desc.iSerialNumber, serial)) {
- libusb_close(ctx->usb_dev);
- continue;
- }
-
- found = true;
- break;
- }
-
- libusb_free_device_list(list, 1);
-
- if (!found) {
- LOG_ERROR("no device found");
- return false;
- }
-
- err = libusb_get_config_descriptor(libusb_get_device(ctx->usb_dev), 0, &config0);
- if (err != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_get_config_descriptor() failed with %d", err);
- libusb_close(ctx->usb_dev);
- return false;
- }
-
- /* Make sure the first configuration is selected */
- int cfg;
- err = libusb_get_configuration(ctx->usb_dev, &cfg);
- if (err != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_get_configuration() failed with %d", err);
- goto error;
- }
-
- if (desc.bNumConfigurations > 0 && cfg != config0->bConfigurationValue) {
- err = libusb_set_configuration(ctx->usb_dev, config0->bConfigurationValue);
- if (err != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_set_configuration() failed with %d", err);
- goto error;
- }
- }
-
- /* Try to detach ftdi_sio kernel module */
- err = libusb_detach_kernel_driver(ctx->usb_dev, ctx->interface);
- if (err != LIBUSB_SUCCESS && err != LIBUSB_ERROR_NOT_FOUND
- && err != LIBUSB_ERROR_NOT_SUPPORTED) {
- LOG_ERROR("libusb_detach_kernel_driver() failed with %d", err);
- goto error;
- }
-
- err = libusb_claim_interface(ctx->usb_dev, ctx->interface);
- if (err != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_claim_interface() failed with %d", err);
- goto error;
- }
-
- /* Reset FTDI device */
- err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
- SIO_RESET_REQUEST, SIO_RESET_SIO,
- ctx->index, NULL, 0, ctx->usb_write_timeout);
- if (err < 0) {
- LOG_ERROR("failed to reset FTDI device: %d", err);
- goto error;
- }
-
- switch (desc.bcdDevice) {
- case 0x500:
- ctx->type = TYPE_FT2232C;
- break;
- case 0x700:
- ctx->type = TYPE_FT2232H;
- break;
- case 0x800:
- ctx->type = TYPE_FT4232H;
- break;
- case 0x900:
- ctx->type = TYPE_FT232H;
- break;
- default:
- LOG_ERROR("unsupported FTDI chip type: 0x%04x", desc.bcdDevice);
- goto error;
- }
-
- /* Determine maximum packet size and endpoint addresses */
- if (!(desc.bNumConfigurations > 0 && ctx->interface < config0->bNumInterfaces
- && config0->interface[ctx->interface].num_altsetting > 0))
- goto desc_error;
-
- const struct libusb_interface_descriptor *descriptor;
- descriptor = &config0->interface[ctx->interface].altsetting[0];
- if (descriptor->bNumEndpoints != 2)
- goto desc_error;
-
- ctx->in_ep = 0;
- ctx->out_ep = 0;
- for (int i = 0; i < descriptor->bNumEndpoints; i++) {
- if (descriptor->endpoint[i].bEndpointAddress & 0x80) {
- ctx->in_ep = descriptor->endpoint[i].bEndpointAddress;
- ctx->max_packet_size =
- descriptor->endpoint[i].wMaxPacketSize;
- } else {
- ctx->out_ep = descriptor->endpoint[i].bEndpointAddress;
- }
- }
-
- if (ctx->in_ep == 0 || ctx->out_ep == 0)
- goto desc_error;
-
- libusb_free_config_descriptor(config0);
- return true;
-
- desc_error:
- LOG_ERROR("unrecognized USB device descriptor");
- error:
- libusb_free_config_descriptor(config0);
- libusb_close(ctx->usb_dev);
- return false;
- }
-
- struct mpsse_ctx *mpsse_open(const uint16_t *vid, const uint16_t *pid, const char *description,
- const char *serial, int channel)
- {
- struct mpsse_ctx *ctx = calloc(1, sizeof(*ctx));
- int err;
-
- if (!ctx)
- return 0;
-
- bit_copy_queue_init(&ctx->read_queue);
- ctx->read_chunk_size = 16384;
- ctx->read_size = 16384;
- ctx->write_size = 16384;
- ctx->read_chunk = malloc(ctx->read_chunk_size);
- ctx->read_buffer = malloc(ctx->read_size);
- ctx->write_buffer = malloc(ctx->write_size);
- if (!ctx->read_chunk || !ctx->read_buffer || !ctx->write_buffer)
- goto error;
-
- ctx->interface = channel;
- ctx->index = channel + 1;
- ctx->usb_read_timeout = 5000;
- ctx->usb_write_timeout = 5000;
-
- err = libusb_init(&ctx->usb_ctx);
- if (err != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_init() failed with %d", err);
- goto error;
- }
-
- if (!open_matching_device(ctx, vid, pid, description, serial)) {
- /* Four hex digits plus terminating zero each */
- char vidstr[5];
- char pidstr[5];
- LOG_ERROR("unable to open ftdi device with vid %s, pid %s, description '%s' and "
- "serial '%s'",
- vid ? sprintf(vidstr, "%04x", *vid), vidstr : "*",
- pid ? sprintf(pidstr, "%04x", *pid), pidstr : "*",
- description ? description : "*",
- serial ? serial : "*");
- ctx->usb_dev = 0;
- goto error;
- }
-
- err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
- SIO_SET_LATENCY_TIMER_REQUEST, 255, ctx->index, NULL, 0,
- ctx->usb_write_timeout);
- if (err < 0) {
- LOG_ERROR("unable to set latency timer: %d", err);
- goto error;
- }
-
- err = libusb_control_transfer(ctx->usb_dev,
- FTDI_DEVICE_OUT_REQTYPE,
- SIO_SET_BITMODE_REQUEST,
- 0x0b | (BITMODE_MPSSE << 8),
- ctx->index,
- NULL,
- 0,
- ctx->usb_write_timeout);
- if (err < 0) {
- LOG_ERROR("unable to set MPSSE bitmode: %d", err);
- goto error;
- }
-
- mpsse_purge(ctx);
-
- return ctx;
- error:
- mpsse_close(ctx);
- return 0;
- }
-
- void mpsse_close(struct mpsse_ctx *ctx)
- {
- if (ctx->usb_dev)
- libusb_close(ctx->usb_dev);
- if (ctx->usb_ctx)
- libusb_exit(ctx->usb_ctx);
- bit_copy_discard(&ctx->read_queue);
- if (ctx->write_buffer)
- free(ctx->write_buffer);
- if (ctx->read_buffer)
- free(ctx->read_buffer);
- if (ctx->read_chunk)
- free(ctx->read_chunk);
-
- free(ctx);
- }
-
- bool mpsse_is_high_speed(struct mpsse_ctx *ctx)
- {
- return ctx->type != TYPE_FT2232C;
- }
-
- void mpsse_purge(struct mpsse_ctx *ctx)
- {
- int err;
- LOG_DEBUG("-");
- ctx->write_count = 0;
- ctx->read_count = 0;
- bit_copy_discard(&ctx->read_queue);
- err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
- SIO_RESET_PURGE_RX, ctx->index, NULL, 0, ctx->usb_write_timeout);
- if (err < 0) {
- LOG_ERROR("unable to purge ftdi rx buffers: %d", err);
- return;
- }
-
- err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
- SIO_RESET_PURGE_TX, ctx->index, NULL, 0, ctx->usb_write_timeout);
- if (err < 0) {
- LOG_ERROR("unable to purge ftdi tx buffers: %d", err);
- return;
- }
- }
-
- static unsigned buffer_write_space(struct mpsse_ctx *ctx)
- {
- /* Reserve one byte for SEND_IMMEDIATE */
- return ctx->write_size - ctx->write_count - 1;
- }
-
- static unsigned buffer_read_space(struct mpsse_ctx *ctx)
- {
- return ctx->read_size - ctx->read_count;
- }
-
- static void buffer_write_byte(struct mpsse_ctx *ctx, uint8_t data)
- {
- DEBUG_IO("%02x", data);
- assert(ctx->write_count < ctx->write_size);
- ctx->write_buffer[ctx->write_count++] = data;
- }
-
- static unsigned buffer_write(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
- unsigned bit_count)
- {
- DEBUG_IO("%d bits", bit_count);
- assert(ctx->write_count + DIV_ROUND_UP(bit_count, 8) <= ctx->write_size);
- bit_copy(ctx->write_buffer + ctx->write_count, 0, out, out_offset, bit_count);
- ctx->write_count += DIV_ROUND_UP(bit_count, 8);
- return bit_count;
- }
-
- static unsigned buffer_add_read(struct mpsse_ctx *ctx, uint8_t *in, unsigned in_offset,
- unsigned bit_count, unsigned offset)
- {
- DEBUG_IO("%d bits, offset %d", bit_count, offset);
- assert(ctx->read_count + DIV_ROUND_UP(bit_count, 8) <= ctx->read_size);
- bit_copy_queued(&ctx->read_queue, in, in_offset, ctx->read_buffer + ctx->read_count, offset,
- bit_count);
- ctx->read_count += DIV_ROUND_UP(bit_count, 8);
- return bit_count;
- }
-
- int mpsse_clock_data_out(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
- unsigned length, uint8_t mode)
- {
- return mpsse_clock_data(ctx, out, out_offset, 0, 0, length, mode);
- }
-
- int mpsse_clock_data_in(struct mpsse_ctx *ctx, uint8_t *in, unsigned in_offset, unsigned length,
- uint8_t mode)
- {
- return mpsse_clock_data(ctx, 0, 0, in, in_offset, length, mode);
- }
-
- int mpsse_clock_data(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset, uint8_t *in,
- unsigned in_offset, unsigned length, uint8_t mode)
- {
- /* TODO: Fix MSB first modes */
- DEBUG_IO("%s%s %d bits", in ? "in" : "", out ? "out" : "", length);
- int retval = ERROR_OK;
-
- /* TODO: On H chips, use command 0x8E/0x8F if in and out are both 0 */
- if (out || (!out && !in))
- mode |= 0x10;
- if (in)
- mode |= 0x20;
-
- while (length > 0) {
- /* Guarantee buffer space enough for a minimum size transfer */
- if (buffer_write_space(ctx) + (length < 8) < (out ? 4 : 3)
- || (in && buffer_read_space(ctx) < 1))
- retval = mpsse_flush(ctx);
-
- if (length < 8) {
- /* Transfer remaining bits in bit mode */
- buffer_write_byte(ctx, 0x02 | mode);
- buffer_write_byte(ctx, length - 1);
- if (out)
- out_offset += buffer_write(ctx, out, out_offset, length);
- if (in)
- in_offset += buffer_add_read(ctx, in, in_offset, length, 8 - length);
- if (!out && !in)
- buffer_write_byte(ctx, 0x00);
- length = 0;
- } else {
- /* Byte transfer */
- unsigned this_bytes = length / 8;
- /* MPSSE command limit */
- if (this_bytes > 65536)
- this_bytes = 65536;
- /* Buffer space limit. We already made sure there's space for the minimum
- *transfer. */
- if (out && this_bytes + 3 > buffer_write_space(ctx))
- this_bytes = buffer_write_space(ctx) - 3;
- if (in && this_bytes > buffer_read_space(ctx))
- this_bytes = buffer_read_space(ctx);
-
- if (this_bytes > 0) {
- buffer_write_byte(ctx, mode);
- buffer_write_byte(ctx, (this_bytes - 1) & 0xff);
- buffer_write_byte(ctx, (this_bytes - 1) >> 8);
- if (out)
- out_offset += buffer_write(ctx,
- out,
- out_offset,
- this_bytes * 8);
- if (in)
- in_offset += buffer_add_read(ctx,
- in,
- in_offset,
- this_bytes * 8,
- 0);
- if (!out && !in)
- for (unsigned n = 0; n < this_bytes; n++)
- buffer_write_byte(ctx, 0x00);
- length -= this_bytes * 8;
- }
- }
- }
- return retval;
- }
-
- int mpsse_clock_tms_cs_out(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
- unsigned length, bool tdi, uint8_t mode)
- {
- return mpsse_clock_tms_cs(ctx, out, out_offset, 0, 0, length, tdi, mode);
- }
-
- int mpsse_clock_tms_cs(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset, uint8_t *in,
- unsigned in_offset, unsigned length, bool tdi, uint8_t mode)
- {
- DEBUG_IO("%sout %d bits, tdi=%d", in ? "in" : "", length, tdi);
- assert(out);
- int retval = ERROR_OK;
-
- mode |= 0x42;
- if (in)
- mode |= 0x20;
-
- while (length > 0) {
- /* Guarantee buffer space enough for a minimum size transfer */
- if (buffer_write_space(ctx) < 3 || (in && buffer_read_space(ctx) < 1))
- retval = mpsse_flush(ctx);
-
- /* Byte transfer */
- unsigned this_bits = length;
- /* MPSSE command limit */
- /* NOTE: there's a report of an FT2232 bug in this area, where shifting
- * exactly 7 bits can make problems with TMS signaling for the last
- * clock cycle:
- *
- * http://developer.intra2net.com/mailarchive/html/libftdi/2009/msg00292.html
- */
- if (this_bits > 7)
- this_bits = 7;
-
- if (this_bits > 0) {
- buffer_write_byte(ctx, mode);
- buffer_write_byte(ctx, this_bits - 1);
- uint8_t data = 0;
- /* TODO: Fix MSB first, if allowed in MPSSE */
- bit_copy(&data, 0, out, out_offset, this_bits);
- out_offset += this_bits;
- buffer_write_byte(ctx, data | (tdi ? 0x80 : 0x00));
- if (in)
- in_offset += buffer_add_read(ctx,
- in,
- in_offset,
- this_bits,
- 8 - this_bits);
- length -= this_bits;
- }
- }
- return retval;
- }
-
- int mpsse_set_data_bits_low_byte(struct mpsse_ctx *ctx, uint8_t data, uint8_t dir)
- {
- DEBUG_IO("-");
- int retval = ERROR_OK;
-
- if (buffer_write_space(ctx) < 3)
- retval = mpsse_flush(ctx);
-
- buffer_write_byte(ctx, 0x80);
- buffer_write_byte(ctx, data);
- buffer_write_byte(ctx, dir);
-
- return retval;
- }
-
- int mpsse_set_data_bits_high_byte(struct mpsse_ctx *ctx, uint8_t data, uint8_t dir)
- {
- DEBUG_IO("-");
- int retval = ERROR_OK;
-
- if (buffer_write_space(ctx) < 3)
- retval = mpsse_flush(ctx);
-
- buffer_write_byte(ctx, 0x82);
- buffer_write_byte(ctx, data);
- buffer_write_byte(ctx, dir);
-
- return retval;
- }
-
- int mpsse_read_data_bits_low_byte(struct mpsse_ctx *ctx, uint8_t *data)
- {
- DEBUG_IO("-");
- int retval = ERROR_OK;
-
- if (buffer_write_space(ctx) < 1)
- retval = mpsse_flush(ctx);
-
- buffer_write_byte(ctx, 0x81);
- buffer_add_read(ctx, data, 0, 8, 0);
-
- return retval;
- }
-
- int mpsse_read_data_bits_high_byte(struct mpsse_ctx *ctx, uint8_t *data)
- {
- DEBUG_IO("-");
- int retval = ERROR_OK;
-
- if (buffer_write_space(ctx) < 1)
- retval = mpsse_flush(ctx);
-
- buffer_write_byte(ctx, 0x83);
- buffer_add_read(ctx, data, 0, 8, 0);
-
- return retval;
- }
-
- static int single_byte_boolean_helper(struct mpsse_ctx *ctx, bool var, uint8_t val_if_true,
- uint8_t val_if_false)
- {
- int retval = ERROR_OK;
-
- if (buffer_write_space(ctx) < 1)
- retval = mpsse_flush(ctx);
-
- buffer_write_byte(ctx, var ? val_if_true : val_if_false);
-
- return retval;
- }
-
- int mpsse_loopback_config(struct mpsse_ctx *ctx, bool enable)
- {
- LOG_DEBUG("%s", enable ? "on" : "off");
- return single_byte_boolean_helper(ctx, enable, 0x84, 0x85);
- }
-
- int mpsse_set_divisor(struct mpsse_ctx *ctx, uint16_t divisor)
- {
- LOG_DEBUG("%d", divisor);
- int retval = ERROR_OK;
-
- if (buffer_write_space(ctx) < 3)
- retval = mpsse_flush(ctx);
-
- buffer_write_byte(ctx, 0x86);
- buffer_write_byte(ctx, divisor & 0xff);
- buffer_write_byte(ctx, divisor >> 8);
-
- return retval;
- }
-
- int mpsse_divide_by_5_config(struct mpsse_ctx *ctx, bool enable)
- {
- if (!mpsse_is_high_speed(ctx))
- return ERROR_FAIL;
-
- LOG_DEBUG("%s", enable ? "on" : "off");
-
- return single_byte_boolean_helper(ctx, enable, 0x8b, 0x8a);
- }
-
- int mpsse_rtck_config(struct mpsse_ctx *ctx, bool enable)
- {
- if (!mpsse_is_high_speed(ctx))
- return ERROR_FAIL;
-
- LOG_DEBUG("%s", enable ? "on" : "off");
-
- return single_byte_boolean_helper(ctx, enable, 0x96, 0x97);
- }
-
- int mpsse_set_frequency(struct mpsse_ctx *ctx, int frequency)
- {
- LOG_DEBUG("target %d Hz", frequency);
- assert(frequency >= 0);
- int base_clock;
-
- if (frequency == 0)
- return mpsse_rtck_config(ctx, true);
-
- mpsse_rtck_config(ctx, false); /* just try */
-
- if (frequency > 60000000 / 2 / 65536 && mpsse_is_high_speed(ctx)) {
- int retval = mpsse_divide_by_5_config(ctx, false);
- if (retval != ERROR_OK)
- return retval;
- base_clock = 60000000;
- } else {
- mpsse_divide_by_5_config(ctx, true); /* just try */
- base_clock = 12000000;
- }
-
- int divisor = (base_clock / 2 + frequency - 1) / frequency - 1;
- if (divisor > 65535)
- divisor = 65535;
- assert(divisor >= 0);
-
- int retval = mpsse_set_divisor(ctx, divisor);
- if (retval != ERROR_OK)
- return retval;
-
- frequency = base_clock / 2 / (1 + divisor);
- LOG_DEBUG("actually %d Hz", frequency);
-
- return frequency;
- }
-
- /* Context needed by the callbacks */
- struct transfer_result {
- struct mpsse_ctx *ctx;
- bool done;
- unsigned transferred;
- };
-
- static LIBUSB_CALL void read_cb(struct libusb_transfer *transfer)
- {
- struct transfer_result *res = (struct transfer_result *)transfer->user_data;
- struct mpsse_ctx *ctx = res->ctx;
-
- unsigned packet_size = ctx->max_packet_size;
-
- DEBUG_PRINT_BUF(transfer->buffer, transfer->actual_length);
-
- /* Strip the two status bytes sent at the beginning of each USB packet
- * while copying the chunk buffer to the read buffer */
- unsigned num_packets = DIV_ROUND_UP(transfer->actual_length, packet_size);
- unsigned chunk_remains = transfer->actual_length;
- for (unsigned i = 0; i < num_packets && chunk_remains > 2; i++) {
- unsigned this_size = packet_size - 2;
- if (this_size > chunk_remains - 2)
- this_size = chunk_remains - 2;
- if (this_size > ctx->read_count - res->transferred)
- this_size = ctx->read_count - res->transferred;
- memcpy(ctx->read_buffer + res->transferred,
- ctx->read_chunk + packet_size * i + 2,
- this_size);
- res->transferred += this_size;
- chunk_remains -= this_size + 2;
- if (res->transferred == ctx->read_count) {
- res->done = true;
- break;
- }
- }
-
- DEBUG_IO("raw chunk %d, transferred %d of %d", transfer->actual_length, res->transferred,
- ctx->read_count);
-
- if (!res->done)
- if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS)
- res->done = true;
- }
-
- static LIBUSB_CALL void write_cb(struct libusb_transfer *transfer)
- {
- struct transfer_result *res = (struct transfer_result *)transfer->user_data;
- struct mpsse_ctx *ctx = res->ctx;
-
- res->transferred += transfer->actual_length;
-
- DEBUG_IO("transferred %d of %d", res->transferred, ctx->write_count);
-
- DEBUG_PRINT_BUF(transfer->buffer, transfer->actual_length);
-
- if (res->transferred == ctx->write_count)
- res->done = true;
- else {
- transfer->length = ctx->write_count - res->transferred;
- transfer->buffer = ctx->write_buffer + res->transferred;
- if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS)
- res->done = true;
- }
- }
-
- int mpsse_flush(struct mpsse_ctx *ctx)
- {
- DEBUG_IO("write %d%s, read %d", ctx->write_count, ctx->read_count ? "+1" : "",
- ctx->read_count);
- assert(ctx->write_count > 0 || ctx->read_count == 0); /* No read data without write data */
- int retval = ERROR_OK;
-
- if (ctx->write_count == 0)
- return retval;
-
- struct libusb_transfer *read_transfer = 0;
- struct transfer_result read_result = { .ctx = ctx, .done = true };
- if (ctx->read_count) {
- buffer_write_byte(ctx, 0x87); /* SEND_IMMEDIATE */
- read_result.done = false;
- read_transfer = libusb_alloc_transfer(0);
- libusb_fill_bulk_transfer(read_transfer, ctx->usb_dev, ctx->in_ep, ctx->read_chunk,
- ctx->read_chunk_size, read_cb, &read_result,
- ctx->usb_read_timeout);
- retval = libusb_submit_transfer(read_transfer);
- }
-
- struct transfer_result write_result = { .ctx = ctx, .done = false };
- struct libusb_transfer *write_transfer = libusb_alloc_transfer(0);
- libusb_fill_bulk_transfer(write_transfer, ctx->usb_dev, ctx->out_ep, ctx->write_buffer,
- ctx->write_count, write_cb, &write_result, ctx->usb_write_timeout);
- retval = libusb_submit_transfer(write_transfer);
-
- /* Polling loop, more or less taken from libftdi */
- while (!write_result.done || !read_result.done) {
- retval = libusb_handle_events(ctx->usb_ctx);
- keep_alive();
- if (retval != LIBUSB_SUCCESS && retval != LIBUSB_ERROR_INTERRUPTED) {
- libusb_cancel_transfer(write_transfer);
- if (read_transfer)
- libusb_cancel_transfer(read_transfer);
- while (!write_result.done || !read_result.done)
- if (libusb_handle_events(ctx->usb_ctx) != LIBUSB_SUCCESS)
- break;
- }
- }
-
- if (retval != LIBUSB_SUCCESS) {
- LOG_ERROR("libusb_handle_events() failed with %d", retval);
- retval = ERROR_FAIL;
- } else if (write_result.transferred < ctx->write_count) {
- LOG_ERROR("ftdi device did not accept all data: %d, tried %d",
- write_result.transferred,
- ctx->write_count);
- retval = ERROR_FAIL;
- } else if (read_result.transferred < ctx->read_count) {
- LOG_ERROR("ftdi device did not return all data: %d, expected %d",
- read_result.transferred,
- ctx->read_count);
- retval = ERROR_FAIL;
- } else if (ctx->read_count) {
- ctx->write_count = 0;
- ctx->read_count = 0;
- bit_copy_execute(&ctx->read_queue);
- retval = ERROR_OK;
- } else {
- ctx->write_count = 0;
- bit_copy_discard(&ctx->read_queue);
- retval = ERROR_OK;
- }
-
- libusb_free_transfer(write_transfer);
- if (read_transfer)
- libusb_free_transfer(read_transfer);
-
- if (retval != ERROR_OK)
- mpsse_purge(ctx);
-
- return retval;
- }
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