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/*
* Author: Andy Green <andy.green@linaro.org>
* Copyright (C) 2012 Linaro, LTD
*
* 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 Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "libarmep.h"
int aep_protocol_parser(struct aep *aep, int samples)
{
unsigned char v;
static unsigned char cmd[] = {
AEPC_CONFIG, 0, 6,
};
int bad = 0;
while (aep->head != aep->tail && samples--) {
v = aep->ring[aep->head++];
if (aep->head == sizeof(aep->ring))
aep->head = 0;
if (aep->aep_context->verbose)
fprintf(stderr, "%02X ", v);
switch (aep->state) {
/*
* this filters the input to sync, it will keep returning to
* look for the first byte if any of AC FF FF FF FF FF FF FF FF
* is not correctly seen.
*/
case APP_INIT_MAGIC:
switch (aep->counter++) {
case 0:
if (v != 0xac)
aep->counter = 0;
break;
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
if (v != 0xff)
aep->counter = 0;
break;
case 63:
if (aep->aep_context->verbose)
fprintf(stderr,
"magic ok, asking for version\n");
v = AEPC_VERSION;
if (write(aep->fd, &v, 1) != 1)
return -1;
aep->state++;
aep->counter = 0;
break;
default:
break;
}
break;
case APP_INIT_VERSION:
switch (aep->counter++) {
case 0:
if (v != 0xac)
return -1;
break;
case 1:
aep->version = v;
break;
case 2:
aep->version |= v << 8;
break;
case 3:
aep->version |= v << 16;
break;
case 4:
aep->version |= v << 24;
break;
case 63:
if (aep->aep_context->verbose)
fprintf(stderr,
"version ok, asking for vendor\n");
v = AEPC_VENDOR;
if (write(aep->fd, &v, 1) != 1)
return -1;
aep->state++;
aep->counter = 0;
break;
default:
break;
}
break;
case APP_INIT_VENDOR:
switch (aep->counter++) {
case 0:
if (v != 0xac)
return -1;
break;
case 63:
if (aep->aep_context->verbose)
fprintf(stderr,
"vendor ok, asking for rate\n");
v = AEPC_RATE;
if (write(aep->fd, &v, 1) != 1)
return -1;
aep->state++;
aep->counter = 0;
aep->name[63] = '\0';
break;
default:
aep->name[aep->counter - 2] = v;
break;
}
break;
case APP_INIT_RATE:
switch (aep->counter++) {
case 0:
if (v != 0xac)
return -1;
break;
case 1:
aep->rate = v;
break;
case 2:
aep->rate |= v << 8;
break;
case 63:
if (aep->aep_context->verbose)
fprintf(stderr,
"rate ok, doing config\n");
aep->state++;
aep->counter = 0;
cmd[1] = 0;
if (write(aep->fd, &cmd[0], sizeof cmd) !=
sizeof cmd)
return -1;
break;
default:
break;
}
break;
case APP_INIT_CONFIG_1:
switch (aep->counter++) {
case 0:
if (v != 0xac)
return -1;
break;
case 63:
if (aep->aep_context->verbose)
fprintf(stderr,
"rate ok, doing config\n");
aep->state++;
aep->counter = 0;
cmd[1] = 1;
if (write(aep->fd, &cmd[0], sizeof cmd) !=
sizeof cmd)
return -1;
break;
default:
break;
}
break;
case APP_INIT_CONFIG_2:
switch (aep->counter++) {
case 0:
if (v != 0xac)
return -1;
break;
case 63:
if (aep->aep_context->verbose)
fprintf(stderr,
"rate ok, doing config\n");
aep->state++;
aep->counter = 0;
cmd[1] = 2;
if (write(aep->fd, &cmd[0], sizeof cmd) !=
sizeof cmd)
return -1;
break;
default:
break;
}
break;
case APP_INIT_CONFIG_3:
switch (aep->counter++) {
case 0:
if (v != 0xac)
return -1;
break;
case 63:
if (aep->aep_context->verbose)
fprintf(stderr,
"Configured new probe instance "
"%s %s %08X %d\n",
aep->dev_filepath, aep->name,
aep->version, aep->rate);
aep->done_config |= 2;
aep->state = APP_INIT_START_ACK;
aep->counter = 0;
break;
default:
break;
}
break;
case APP_INIT_START_ACK:
if (v != 0xac) {
return -1;
}
if (aep->aep_context->verbose) {
fprintf(stderr,
"Start acknowledge seen "
"%s %s %08X %d\n",
aep->dev_filepath, aep->name,
aep->version, aep->rate);
}
aep->done_config |= 4;
aep->state = APP_FRAME_L;
aep->counter = 0;
break;
case APP_FRAME_L:
if (v == (aep->predicted_frame & 0xff)) {
aep->state = APP_FRAME_H;
break;
}
fprintf(stderr, "%d:.L(%d %d)", aep->index, v, aep->predicted_frame & 0xff);
/* lost sync... */
if (aep->invalid < AEP_INVALID_COVER)
aep->invalid = AEP_INVALID_COVER;
aep->state = APP_FRAME_H_BAD;
break;
case APP_FRAME_H:
if (v == aep->predicted_frame >> 8) {
aep->state = APP_VOLTAGE_L1;
aep->predicted_frame++;
if (aep->invalid) {
aep->invalid--;
if (aep->invalid == 0)
fprintf(stderr, "%d:donetime\n", aep->index);
else
fprintf(stderr, "-%d:%d-", aep->index, aep->invalid);
}
break;
}
fprintf(stderr, "%d:.H(%d %d)", aep->index, v, aep->predicted_frame >> 8);
/* fallthru */
case APP_FRAME_H_BAD:
/* lost sync - slip one byte and use that as frame prediction for next time */
aep->predicted_frame = v;
if (aep->invalid < AEP_INVALID_COVER)
aep->invalid = AEP_INVALID_COVER;
aep->state = APP_VOLTAGE_L1_BAD;
break;
case APP_VOLTAGE_L1_BAD:
aep->predicted_frame |= v << 8;
aep->predicted_frame++;
aep->state = APP_VOLTAGE_H1_BAD;
break;
case APP_VOLTAGE_H1_BAD:
case APP_CURRENT_L1_BAD:
case APP_CURRENT_H1_BAD:
case APP_VOLTAGE_L2_BAD:
case APP_VOLTAGE_H2_BAD:
case APP_CURRENT_L2_BAD:
case APP_CURRENT_H2_BAD:
case APP_VOLTAGE_L3_BAD:
case APP_VOLTAGE_H3_BAD:
case APP_CURRENT_L3_BAD:
case APP_CURRENT_H3_BAD:
aep->state++;
break;
case APP_SWALLOW:
//if (aep->aep_context->verbose)
fprintf(stderr, "%s: LOST SYNC *\n",
aep->dev_filepath);
bad++;
if (bad > 16) {
fprintf(stderr, "%s: too much lost sync\n",
aep->dev_filepath);
return -1;
}
aep->state = APP_FRAME_L;
break;
/* good path */
case APP_VOLTAGE_L1:
aep->voltage = v;
aep->state++;
break;
case APP_VOLTAGE_H1:
aep->voltage |= v << 8;
aep->state++;
break;
case APP_CURRENT_L1:
aep->current = v;
aep->state++;
break;
case APP_CURRENT_H1:
aep->current |= v << 8;
aep->state++;
if (aep->invalid)
break;
if (aep->current > ADC_COUNT_CURRENT_CLIP_LIMIT)
fprintf(stderr, "\n*** %d.0: %s Shunt diff voltage %fV above"
" %fV limit: clipping *** \n",
aep->index, aep->ch[0].channel_name,
(double)aep->current / ADC_COUNTS_PER_VOLT_CH2,
(double)ADC_COUNT_CURRENT_CLIP_LIMIT /
ADC_COUNTS_PER_VOLT_CH2);
return process_sample(aep, 0);
case APP_VOLTAGE_L2:
aep->voltage = v;
aep->state++;
break;
case APP_VOLTAGE_H2:
aep->voltage |= v << 8;
aep->state++;
break;
case APP_CURRENT_L2:
aep->current = v;
aep->state++;
break;
case APP_CURRENT_H2:
aep->current |= v << 8;
aep->state++;
if (aep->invalid)
break;
if (aep->current > ADC_COUNT_CURRENT_CLIP_LIMIT)
fprintf(stderr, "\n*** %d.1: %s Shunt diff voltage %fV above"
" %fV limit: clipping *** \n",
aep->index, aep->ch[1].channel_name,
(double)aep->current / ADC_COUNTS_PER_VOLT_CH2,
(double)ADC_COUNT_CURRENT_CLIP_LIMIT /
ADC_COUNTS_PER_VOLT_CH2);
return process_sample(aep, 1);
case APP_VOLTAGE_L3:
aep->voltage = v;
aep->state++;
break;
case APP_VOLTAGE_H3:
aep->voltage |= v << 8;
aep->state++;
break;
case APP_CURRENT_L3:
aep->current = v;
aep->state++;
break;
case APP_CURRENT_H3:
aep->current |= v << 8;
aep->state = APP_FRAME_L;
if (aep->invalid) {
fprintf(stderr, "#%d ", aep->index);
break;
}
if (aep->current > ADC_COUNT_CURRENT_CLIP_LIMIT)
fprintf(stderr, "\n*** %d.2: %s Shunt diff voltage %fV above"
" %fV limit: clipping *** \n",
aep->index, aep->ch[2].channel_name,
(double)aep->current / ADC_COUNTS_PER_VOLT_CH2,
(double)ADC_COUNT_CURRENT_CLIP_LIMIT /
ADC_COUNTS_PER_VOLT_CH2);
return process_sample(aep, 2);
}
}
return 0;
}
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