+++ /dev/null
-/*
- * This file is part of the libsigrok project.
- *
- * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de>
- * Copyright (C) 2014 Bert Vermeulen <bert@biot.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, see <http://www.gnu.org/licenses/>.
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <glib.h>
-#include "libsigrok.h"
-#include "libsigrok-internal.h"
-
-#define LOG_PREFIX "output/chronovu-la8"
-
-struct context {
- unsigned int num_enabled_channels;
- gboolean triggered;
- uint64_t samplerate;
- uint64_t samplecount;
- int *channel_index;
- GString *pretrig_buf;
-};
-
-/**
- * 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 gboolean is_valid_samplerate(uint64_t samplerate)
-{
- unsigned int i;
-
- for (i = 0; i < 255; i++) {
- if (samplerate == (SR_MHZ(100) / (i + 1)))
- return TRUE;
- }
-
- return FALSE;
-}
-
-/**
- * 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 || !is_valid_samplerate(samplerate)) {
- sr_warn("Invalid samplerate (%" PRIu64 "Hz)", samplerate);
- return 0xff;
- }
-
- return (SR_MHZ(100) / samplerate) - 1;
-}
-
-static int init(struct sr_output *o)
-{
- struct context *ctx;
- struct sr_channel *ch;
- GSList *l;
-
- if (!o || !o->sdi)
- return SR_ERR_ARG;
-
- ctx = g_malloc0(sizeof(struct context));
- o->internal = ctx;
-
- for (l = o->sdi->channels; l; l = l->next) {
- ch = l->data;
- if (ch->type != SR_CHANNEL_LOGIC)
- continue;
- if (!ch->enabled)
- continue;
- ctx->num_enabled_channels++;
- }
- ctx->channel_index = g_malloc(sizeof(int) * ctx->num_enabled_channels);
- ctx->pretrig_buf = g_string_sized_new(1024);
-
- return SR_OK;
-}
-
-static int receive(struct sr_output *o, const struct sr_datafeed_packet *packet,
- GString **out)
-{
- const struct sr_datafeed_logic *logic;
- struct context *ctx;
- GVariant *gvar;
- uint64_t samplerate;
- gchar c[4];
-
- *out = NULL;
- if (!o || !o->sdi)
- return SR_ERR_ARG;
- if (!(ctx = o->internal))
- return SR_ERR_ARG;
-
- switch (packet->type) {
- case SR_DF_HEADER:
- /* One byte for the 'divcount' value. */
- if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
- &gvar) == SR_OK) {
- samplerate = g_variant_get_uint64(gvar);
- g_variant_unref(gvar);
- } else
- samplerate = 0;
- c[0] = samplerate_to_divcount(samplerate);
- *out = g_string_new_len(c, 1);
- ctx->triggered = FALSE;
- break;
- case SR_DF_TRIGGER:
- /* Four bytes (little endian) for the trigger point. */
- c[0] = ctx->samplecount & 0xff;
- c[1] = (ctx->samplecount >> 8) & 0xff;
- c[2] = (ctx->samplecount >> 16) & 0xff;
- c[3] = (ctx->samplecount >> 24) & 0xff;
- *out = g_string_new_len(c, 4);
- /* Flush the pre-trigger buffer. */
- if (ctx->pretrig_buf->len)
- g_string_append_len(*out, ctx->pretrig_buf->str,
- ctx->pretrig_buf->len);
- ctx->triggered = TRUE;
- break;
- case SR_DF_LOGIC:
- logic = packet->payload;
- if (!ctx->triggered)
- g_string_append_len(ctx->pretrig_buf, logic->data, logic->length);
- else
- *out = g_string_new_len(logic->data, logic->length);
- ctx->samplecount += logic->length / logic->unitsize;
- break;
- case SR_DF_END:
- if (!ctx->triggered && ctx->pretrig_buf->len) {
- /* We never got a trigger, submit an empty one. */
- *out = g_string_sized_new(ctx->pretrig_buf->len + 4);
- g_string_append_len(*out, "\x00\x00\x00\x00", 4);
- g_string_append_len(*out, ctx->pretrig_buf->str, ctx->pretrig_buf->len);
- }
- break;
- }
-
- return SR_OK;
-}
-
-static int cleanup(struct sr_output *o)
-{
- struct context *ctx;
-
- if (!o || !o->sdi)
- return SR_ERR_ARG;
-
- if (o->internal) {
- ctx = o->internal;
- g_string_free(ctx->pretrig_buf, TRUE);
- g_free(ctx->channel_index);
- g_free(o->internal);
- o->internal = NULL;
- }
-
- return SR_OK;
-}
-
-SR_PRIV struct sr_output_format output_chronovu_la8 = {
- .id = "chronovu-la8",
- .description = "ChronoVu LA8",
- .init = init,
- .receive = receive,
- .cleanup = cleanup,
-};
projects / libsigrok.git / blobdiff