--- /dev/null
+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <glib.h>
+#include <sigrok.h>
+
+struct context {
+ unsigned int num_enabled_probes;
+ unsigned int unitsize;
+ char *probelist[SR_MAX_NUM_PROBES + 1];
+ uint64_t trigger_point;
+ uint64_t samplerate;
+};
+
+/**
+ * Check if the given samplerate is supported by the LA8 hardware.
+ *
+ * @param samplerate The samplerate (in Hz) to check.
+ * @return 1 if the samplerate is supported/valid, 0 otherwise.
+ */
+static int is_valid_samplerate(uint64_t samplerate)
+{
+ unsigned int i;
+
+ for (i = 0; i < 255; i++) {
+ if (samplerate == (SR_MHZ(100) / (i + 1)))
+ return 1;
+ }
+
+ g_warning("la8 out: %s: invalid samplerate (%" PRIu64 "Hz)",
+ __func__, samplerate);
+
+ return 0;
+}
+
+/**
+ * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants.
+ *
+ * LA8 hardware: sample period = (divcount + 1) * 10ns.
+ * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate).
+ * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate).
+ *
+ * @param samplerate The samplerate in Hz.
+ * @return The divcount value as needed by the hardware, or 0xff upon errors.
+ */
+static uint8_t samplerate_to_divcount(uint64_t samplerate)
+{
+ if (samplerate == 0) {
+ g_warning("la8 out: %s: samplerate was 0", __func__);
+ return 0xff;
+ }
+
+ if (!is_valid_samplerate(samplerate)) {
+ g_warning("la8 out: %s: can't get divcount, samplerate invalid",
+ __func__);
+ return 0xff;
+ }
+
+ return (SR_MHZ(100) / samplerate) - 1;
+}
+
+static int init(struct sr_output *o)
+{
+ struct context *ctx;
+ struct sr_probe *probe;
+ GSList *l;
+ int num_probes;
+ uint64_t samplerate;
+
+ if (!o) {
+ g_warning("la8 out: %s: o was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!o->device) {
+ g_warning("la8 out: %s: o->device was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!o->device->plugin) {
+ g_warning("la8 out: %s: o->device->plugin was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!(ctx = calloc(1, sizeof(struct context)))) {
+ g_warning("la8 out: %s: ctx calloc failed", __func__);
+ return SR_ERR_MALLOC;
+ }
+
+ o->internal = ctx;
+
+ /* Get the number of probes, their names, and the unitsize. */
+ /* TODO: Error handling. */
+ for (l = o->device->probes; l; l = l->next) {
+ probe = l->data;
+ if (!probe->enabled)
+ continue;
+ ctx->probelist[ctx->num_enabled_probes++] = probe->name;
+ }
+ ctx->probelist[ctx->num_enabled_probes] = 0;
+ ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
+
+ num_probes = g_slist_length(o->device->probes);
+
+ if (sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
+ samplerate = *((uint64_t *) o->device->plugin->get_device_info(
+ o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
+ /* TODO: Error checks. */
+ } else {
+ samplerate = 0; /* TODO: Error or set some value? */
+ }
+ ctx->samplerate = samplerate;
+
+ return 0; /* TODO: SR_OK? */
+}
+
+static int event(struct sr_output *o, int event_type, char **data_out,
+ uint64_t *length_out)
+{
+ struct context *ctx;
+ char *outbuf;
+
+ if (!o) {
+ g_warning("la8 out: %s: o was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!(ctx = o->internal)) {
+ g_warning("la8 out: %s: o->internal was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!data_out) {
+ g_warning("la8 out: %s: data_out was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ switch (event_type) {
+ case SR_DF_TRIGGER:
+ g_debug("la8 out: %s: SR_DF_TRIGGER event", __func__);
+ /* Save the trigger point for later (SR_DF_END). */
+ ctx->trigger_point = 0; /* TODO: Store _actual_ value. */
+ break;
+ case SR_DF_END:
+ g_debug("la8 out: %s: SR_DF_END event", __func__);
+ if (!(outbuf = malloc(4 + 1))) {
+ g_warning("la8 out: %s: outbuf malloc failed",
+ __func__);
+ return SR_ERR_MALLOC;
+ }
+
+ /* One byte for the 'divcount' value. */
+ outbuf[0] = samplerate_to_divcount(ctx->samplerate);
+ // if (outbuf[0] == 0xff) {
+ // g_warning("la8 out: %s: invalid divcount", __func__);
+ // return SR_ERR;
+ // }
+
+ /* Four bytes (little endian) for the trigger point. */
+ outbuf[1] = (ctx->trigger_point >> 0) & 0xff;
+ outbuf[2] = (ctx->trigger_point >> 8) & 0xff;
+ outbuf[3] = (ctx->trigger_point >> 16) & 0xff;
+ outbuf[4] = (ctx->trigger_point >> 24) & 0xff;
+
+ *data_out = outbuf;
+ *length_out = 4 + 1;
+ free(o->internal);
+ o->internal = NULL;
+ break;
+ default:
+ g_warning("la8 out: %s: unsupported event type: %d", __func__,
+ event_type);
+ *data_out = NULL;
+ *length_out = 0;
+ break;
+ }
+
+ return SR_OK;
+}
+
+static int data(struct sr_output *o, const char *data_in, uint64_t length_in,
+ char **data_out, uint64_t *length_out)
+{
+ struct context *ctx;
+ char *outbuf;
+
+ if (!o) {
+ g_warning("la8 out: %s: o was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!(ctx = o->internal)) {
+ g_warning("la8 out: %s: o->internal was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!data_in) {
+ g_warning("la8 out: %s: data_in was NULL", __func__);
+ return SR_ERR_ARG;
+ }
+
+ if (!(outbuf = calloc(1, length_in))) {
+ g_warning("la8 out: %s: outbuf calloc failed", __func__);
+ return SR_ERR_MALLOC;
+ }
+
+ memcpy(outbuf, data_in, length_in);
+
+ *data_out = outbuf;
+ *length_out = length_in;
+
+ return SR_OK;
+}
+
+struct sr_output_format output_chronovu_la8 = {
+ .id = "chronovu-la8",
+ .description = "ChronoVu LA8",
+ .df_type = SR_DF_LOGIC,
+ .init = init,
+ .data = data,
+ .event = event,
+};
projects / libsigrok.git / commitdiff