SR_CONF_LIMIT_SAMPLES,
};
-/* Initialize the logic analyzer mode. */
-static uint8_t logic_mode_start[] = {
- 0x00, 0x40, 0x0f, 0x25, 0x35, 0x40,
- 0x2a, 0x3a, 0x40, 0x03, 0x20, 0x38,
-};
-
static const char *sigma_firmware_files[] = {
/* 50 MHz, supports 8 bit fractions */
FIRMWARE_DIR "/asix-sigma-50.fw",
return SR_OK;
}
-/* Generate the bitbang stream for programming the FPGA. */
-static int bin2bitbang(const char *filename,
- unsigned char **buf, size_t *buf_size)
-{
- FILE *f;
- unsigned long file_size;
- unsigned long offset = 0;
- unsigned char *p;
- uint8_t *firmware;
- unsigned long fwsize = 0;
- const int buffer_size = 65536;
- size_t i;
- int c, bit, v;
- uint32_t imm = 0x3f6df2ab;
-
- f = g_fopen(filename, "rb");
- if (!f) {
- sr_err("g_fopen(\"%s\", \"rb\")", filename);
- return SR_ERR;
- }
-
- if (-1 == fseek(f, 0, SEEK_END)) {
- sr_err("fseek on %s failed", filename);
- fclose(f);
- return SR_ERR;
- }
-
- file_size = ftell(f);
-
- fseek(f, 0, SEEK_SET);
-
- if (!(firmware = g_try_malloc(buffer_size))) {
- sr_err("%s: firmware malloc failed", __func__);
- fclose(f);
- return SR_ERR_MALLOC;
- }
-
- while ((c = getc(f)) != EOF) {
- imm = (imm + 0xa853753) % 177 + (imm * 0x8034052);
- firmware[fwsize++] = c ^ imm;
- }
- fclose(f);
-
- if(fwsize != file_size) {
- sr_err("%s: Error reading firmware", filename);
- fclose(f);
- g_free(firmware);
- return SR_ERR;
- }
-
- *buf_size = fwsize * 2 * 8;
-
- *buf = p = (unsigned char *)g_try_malloc(*buf_size);
- if (!p) {
- sr_err("%s: buf/p malloc failed", __func__);
- g_free(firmware);
- return SR_ERR_MALLOC;
- }
-
- for (i = 0; i < fwsize; ++i) {
- for (bit = 7; bit >= 0; --bit) {
- v = firmware[i] & 1 << bit ? 0x40 : 0x00;
- p[offset++] = v | 0x01;
- p[offset++] = v;
- }
- }
-
- g_free(firmware);
-
- if (offset != *buf_size) {
- g_free(*buf);
- sr_err("Error reading firmware %s "
- "offset=%ld, file_size=%ld, buf_size=%zd.",
- filename, offset, file_size, *buf_size);
-
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
static void clear_helper(void *priv)
{
struct dev_context *devc;
return SR_ERR_TIMEOUT;
}
+/*
+ * Configure the FPGA for logic-analyzer mode.
+ */
+static int sigma_fpga_init_la(struct dev_context *devc)
+{
+ /* Initialize the logic analyzer mode. */
+ uint8_t logic_mode_start[] = {
+ REG_ADDR_LOW | (READ_ID & 0xf),
+ REG_ADDR_HIGH | (READ_ID >> 8),
+ REG_READ_ADDR, /* Read ID register. */
+
+ REG_ADDR_LOW | (WRITE_TEST & 0xf),
+ REG_DATA_LOW | 0x5,
+ REG_DATA_HIGH_WRITE | 0x5,
+ REG_READ_ADDR, /* Read scratch register. */
+
+ REG_DATA_LOW | 0xa,
+ REG_DATA_HIGH_WRITE | 0xa,
+ REG_READ_ADDR, /* Read scratch register. */
+
+ REG_ADDR_LOW | (WRITE_MODE & 0xf),
+ REG_DATA_LOW | 0x0,
+ REG_DATA_HIGH_WRITE | 0x8,
+ };
+
+ uint8_t result[3];
+ int ret;
+
+ /* Initialize the logic analyzer mode. */
+ sigma_write(logic_mode_start, sizeof(logic_mode_start), devc);
+
+ /* Expect a 3 byte reply since we issued three READ requests. */
+ ret = sigma_read(result, 3, devc);
+ if (ret != 3)
+ goto err;
+
+ if (result[0] != 0xa6 || result[1] != 0x55 || result[2] != 0xaa)
+ goto err;
+
+ return SR_OK;
+err:
+ sr_err("Configuration failed. Invalid reply received.");
+ return SR_ERR;
+}
+
+/*
+ * Read the firmware from a file and transform it into a series of bitbang
+ * pulses used to program the FPGA. Note that the *bb_cmd must be free()'d
+ * by the caller of this function.
+ */
+static int sigma_fw_2_bitbang(const char *filename,
+ uint8_t **bb_cmd, gsize *bb_cmd_size)
+{
+ GMappedFile *file;
+ GError *error;
+ gsize i, file_size, bb_size;
+ gchar *firmware;
+ uint8_t *bb_stream, *bbs;
+ uint32_t imm;
+ int bit, v;
+ int ret = SR_OK;
+
+ /*
+ * Map the file and make the mapped buffer writable.
+ * NOTE: Using writable=TRUE does _NOT_ mean that file that is mapped
+ * will be modified. It will not be modified until someone uses
+ * g_file_set_contents() on it.
+ */
+ error = NULL;
+ file = g_mapped_file_new(filename, TRUE, &error);
+ g_assert_no_error(error);
+
+ file_size = g_mapped_file_get_length(file);
+ firmware = g_mapped_file_get_contents(file);
+ g_assert(firmware);
+
+ /* Weird magic transformation below, I have no idea what it does. */
+ imm = 0x3f6df2ab;
+ for (i = 0; i < file_size; i++) {
+ imm = (imm + 0xa853753) % 177 + (imm * 0x8034052);
+ firmware[i] ^= imm & 0xff;
+ }
+
+ /*
+ * Now that the firmware is "transformed", we will transcribe the
+ * firmware blob into a sequence of toggles of the Dx wires. This
+ * sequence will be fed directly into the Sigma, which must be in
+ * the FPGA bitbang programming mode.
+ */
+
+ /* Each bit of firmware is transcribed as two toggles of Dx wires. */
+ bb_size = file_size * 8 * 2;
+ bb_stream = (uint8_t *)g_try_malloc(bb_size);
+ if (!bb_stream) {
+ sr_err("%s: Failed to allocate bitbang stream", __func__);
+ ret = SR_ERR_MALLOC;
+ goto exit;
+ }
+
+ bbs = bb_stream;
+ for (i = 0; i < file_size; i++) {
+ for (bit = 7; bit >= 0; bit--) {
+ v = (firmware[i] & (1 << bit)) ? 0x40 : 0x00;
+ *bbs++ = v | 0x01;
+ *bbs++ = v;
+ }
+ }
+
+ /* The transformation completed successfully, return the result. */
+ *bb_cmd = bb_stream;
+ *bb_cmd_size = bb_size;
+
+exit:
+ g_mapped_file_unref(file);
+ return ret;
+}
+
static int upload_firmware(int firmware_idx, struct dev_context *devc)
{
int ret;
unsigned char *buf;
unsigned char pins;
size_t buf_size;
- unsigned char result[32];
const char *firmware = sigma_firmware_files[firmware_idx];
+ struct ftdi_context *ftdic = &devc->ftdic;
/* Make sure it's an ASIX SIGMA. */
- if ((ret = ftdi_usb_open_desc(&devc->ftdic,
- USB_VENDOR, USB_PRODUCT, USB_DESCRIPTION, NULL)) < 0) {
+ ret = ftdi_usb_open_desc(ftdic, USB_VENDOR, USB_PRODUCT,
+ USB_DESCRIPTION, NULL);
+ if (ret < 0) {
sr_err("ftdi_usb_open failed: %s",
- ftdi_get_error_string(&devc->ftdic));
+ ftdi_get_error_string(ftdic));
return 0;
}
- if ((ret = ftdi_set_bitmode(&devc->ftdic, 0xdf, BITMODE_BITBANG)) < 0) {
+ ret = ftdi_set_bitmode(ftdic, 0xdf, BITMODE_BITBANG);
+ if (ret < 0) {
sr_err("ftdi_set_bitmode failed: %s",
- ftdi_get_error_string(&devc->ftdic));
+ ftdi_get_error_string(ftdic));
return 0;
}
/* Four times the speed of sigmalogan - Works well. */
- if ((ret = ftdi_set_baudrate(&devc->ftdic, 750000)) < 0) {
+ ret = ftdi_set_baudrate(ftdic, 750000);
+ if (ret < 0) {
sr_err("ftdi_set_baudrate failed: %s",
- ftdi_get_error_string(&devc->ftdic));
+ ftdi_get_error_string(ftdic));
return 0;
}
return ret;
/* Prepare firmware. */
- if ((ret = bin2bitbang(firmware, &buf, &buf_size)) != SR_OK) {
+ ret = sigma_fw_2_bitbang(firmware, &buf, &buf_size);
+ if (ret != SR_OK) {
sr_err("An error occured while reading the firmware: %s",
firmware);
return ret;
g_free(buf);
- if ((ret = ftdi_set_bitmode(&devc->ftdic, 0x00, BITMODE_RESET)) < 0) {
+ ret = ftdi_set_bitmode(ftdic, 0x00, BITMODE_RESET);
+ if (ret < 0) {
sr_err("ftdi_set_bitmode failed: %s",
- ftdi_get_error_string(&devc->ftdic));
+ ftdi_get_error_string(ftdic));
return SR_ERR;
}
- ftdi_usb_purge_buffers(&devc->ftdic);
+ ftdi_usb_purge_buffers(ftdic);
/* Discard garbage. */
- while (1 == sigma_read(&pins, 1, devc))
+ while (sigma_read(&pins, 1, devc) == 1)
;
- /* Initialize the logic analyzer mode. */
- sigma_write(logic_mode_start, sizeof(logic_mode_start), devc);
-
- /* Expect a 3 byte reply. */
- ret = sigma_read(result, 3, devc);
- if (ret != 3 ||
- result[0] != 0xa6 || result[1] != 0x55 || result[2] != 0xaa) {
- sr_err("Configuration failed. Invalid reply received.");
- return SR_ERR;
- }
+ /* Initialize the FPGA for logic-analyzer mode. */
+ ret = sigma_fpga_init_la(devc);
+ if (ret != SR_OK)
+ return ret;
devc->cur_firmware = firmware_idx;
}
-static int receive_data(int fd, int revents, void *cb_data)
+/*
+ * Handle the Sigma when in CAPTURE mode. This function checks:
+ * - Sampling time ended
+ * - DRAM capacity overflow
+ * This function triggers download of the samples from Sigma
+ * in case either of the above conditions is true.
+ */
+static int sigma_capture_mode(struct sr_dev_inst *sdi)
{
- struct sr_dev_inst *sdi;
- struct dev_context *devc;
+ struct dev_context *devc = sdi->priv;
+
struct sr_datafeed_packet packet;
uint64_t running_msec;
struct timeval tv;
- int numchunks;
uint8_t modestatus;
- (void)fd;
- (void)revents;
+ uint32_t stoppos, triggerpos;
- sdi = cb_data;
- devc = sdi->priv;
+ /* Check if the selected sampling duration passed. */
+ gettimeofday(&tv, 0);
+ running_msec = (tv.tv_sec - devc->start_tv.tv_sec) * 1000 +
+ (tv.tv_usec - devc->start_tv.tv_usec) / 1000;
+ if (running_msec >= devc->limit_msec)
+ goto download;
+
+ /* Get the position in DRAM to which the FPGA is writing now. */
+ sigma_read_pos(&stoppos, &triggerpos, devc);
+ /* Test if DRAM is full and if so, download the data. */
+ if ((stoppos >> 9) == 32767)
+ goto download;
+
+ return TRUE;
+
+download:
+
+ /* Stop acquisition. */
+ sigma_set_register(WRITE_MODE, 0x11, devc);
+
+ /* Set SDRAM Read Enable. */
+ sigma_set_register(WRITE_MODE, 0x02, devc);
/* Get the current position. */
sigma_read_pos(&devc->state.stoppos, &devc->state.triggerpos, devc);
- if (devc->state.state == SIGMA_IDLE)
- return TRUE;
-
- if (devc->state.state == SIGMA_CAPTURE) {
- numchunks = (devc->state.stoppos + 511) / 512;
+ /* Check if trigger has fired. */
+ modestatus = sigma_get_register(READ_MODE, devc);
+ if (modestatus & 0x20)
+ devc->state.triggerchunk = devc->state.triggerpos / 512;
+ else
+ devc->state.triggerchunk = -1;
- /* Check if the timer has expired, or memory is full. */
- gettimeofday(&tv, 0);
- running_msec = (tv.tv_sec - devc->start_tv.tv_sec) * 1000 +
- (tv.tv_usec - devc->start_tv.tv_usec) / 1000;
+ /* Transfer captured data from device. */
+ download_capture(sdi);
- if (running_msec < devc->limit_msec && numchunks < 32767)
- /* Still capturing. */
- return TRUE;
+ /* All done. */
+ packet.type = SR_DF_END;
+ sr_session_send(sdi, &packet);
- /* Stop acquisition. */
- sigma_set_register(WRITE_MODE, 0x11, devc);
+ dev_acquisition_stop(sdi, sdi);
- /* Set SDRAM Read Enable. */
- sigma_set_register(WRITE_MODE, 0x02, devc);
+ return TRUE;
+}
- /* Get the current position. */
- sigma_read_pos(&devc->state.stoppos, &devc->state.triggerpos, devc);
+static int receive_data(int fd, int revents, void *cb_data)
+{
+ struct sr_dev_inst *sdi;
+ struct dev_context *devc;
- /* Check if trigger has fired. */
- modestatus = sigma_get_register(READ_MODE, devc);
- if (modestatus & 0x20)
- devc->state.triggerchunk = devc->state.triggerpos / 512;
- else
- devc->state.triggerchunk = -1;
+ (void)fd;
+ (void)revents;
- /* Transfer captured data from device. */
- download_capture(sdi);
+ sdi = cb_data;
+ devc = sdi->priv;
- /* All done. */
- packet.type = SR_DF_END;
- sr_session_send(sdi, &packet);
+ if (devc->state.state == SIGMA_IDLE)
+ return TRUE;
- dev_acquisition_stop(sdi, sdi);
- }
+ if (devc->state.state == SIGMA_CAPTURE)
+ return sigma_capture_mode(sdi);
return TRUE;
}
projects / libsigrok.git / blobdiff