libsigrok/output/chronovu_la8.c

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/*
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* This file is part of the libsigrok project.
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*
* 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 "libsigrok.h"
#include "libsigrok-internal.h"
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#define LOG_PREFIX "output/chronovu-la8"
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struct context {
unsigned int num_enabled_probes;
unsigned int unitsize;
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.
*
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* @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;
}
sr_warn("%s: invalid samplerate (%" PRIu64 "Hz)",
__func__, samplerate);
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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.
*
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* @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) {
sr_warn("%s: samplerate was 0", __func__);
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return 0xff;
}
if (!is_valid_samplerate(samplerate)) {
sr_warn("%s: can't get divcount, samplerate invalid", __func__);
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return 0xff;
}
return (SR_MHZ(100) / samplerate) - 1;
}
static int init(struct sr_output *o)
{
struct context *ctx;
struct sr_probe *probe;
GSList *l;
GVariant *gvar;
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if (!o) {
sr_warn("%s: o was NULL", __func__);
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return SR_ERR_ARG;
}
if (!o->sdi) {
sr_warn("%s: o->sdi was NULL", __func__);
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return SR_ERR_ARG;
}
if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
sr_warn("%s: ctx malloc failed", __func__);
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return SR_ERR_MALLOC;
}
o->internal = ctx;
/* Get the unitsize. */
for (l = o->sdi->probes; l; l = l->next) {
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probe = l->data;
if (probe->type != SR_PROBE_LOGIC)
continue;
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if (!probe->enabled)
continue;
ctx->num_enabled_probes++;
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}
ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
&gvar) == SR_OK) {
ctx->samplerate = g_variant_get_uint64(gvar);
g_variant_unref(gvar);
} else
ctx->samplerate = 0;
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return SR_OK;
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}
static int event(struct sr_output *o, int event_type, uint8_t **data_out,
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uint64_t *length_out)
{
struct context *ctx;
uint8_t *outbuf;
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if (!o) {
sr_warn("%s: o was NULL", __func__);
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return SR_ERR_ARG;
}
if (!(ctx = o->internal)) {
sr_warn("%s: o->internal was NULL", __func__);
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return SR_ERR_ARG;
}
if (!data_out) {
sr_warn("%s: data_out was NULL", __func__);
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return SR_ERR_ARG;
}
switch (event_type) {
case SR_DF_TRIGGER:
sr_dbg("%s: SR_DF_TRIGGER event", __func__);
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/* Save the trigger point for later (SR_DF_END). */
ctx->trigger_point = 0; /* TODO: Store _actual_ value. */
break;
case SR_DF_END:
sr_dbg("%s: SR_DF_END event", __func__);
if (!(outbuf = g_try_malloc(4 + 1))) {
sr_warn("la8 out: %s: outbuf malloc failed", __func__);
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return SR_ERR_MALLOC;
}
/* One byte for the 'divcount' value. */
outbuf[0] = samplerate_to_divcount(ctx->samplerate);
// if (outbuf[0] == 0xff) {
// sr_warn("%s: invalid divcount", __func__);
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// 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;
g_free(o->internal);
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o->internal = NULL;
break;
default:
sr_warn("%s: unsupported event type: %d", __func__,
event_type);
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*data_out = NULL;
*length_out = 0;
break;
}
return SR_OK;
}
static int data(struct sr_output *o, const uint8_t *data_in,
uint64_t length_in, uint8_t **data_out, uint64_t *length_out)
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{
struct context *ctx;
uint8_t *outbuf;
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if (!o) {
sr_warn("%s: o was NULL", __func__);
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return SR_ERR_ARG;
}
if (!(ctx = o->internal)) {
sr_warn("%s: o->internal was NULL", __func__);
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return SR_ERR_ARG;
}
if (!data_in) {
sr_warn("%s: data_in was NULL", __func__);
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return SR_ERR_ARG;
}
if (!(outbuf = g_try_malloc0(length_in))) {
sr_warn("%s: outbuf malloc failed", __func__);
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return SR_ERR_MALLOC;
}
memcpy(outbuf, data_in, length_in);
*data_out = outbuf;
*length_out = length_in;
return SR_OK;
}
SR_PRIV struct sr_output_format output_chronovu_la8 = {
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.id = "chronovu-la8",
.description = "ChronoVu LA8",
.df_type = SR_DF_LOGIC,
.init = init,
.data = data,
.event = event,
};