nilm/ethstream
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Better command structure using hton, ntoh, and friends

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Altered command structure to support full 20 bit period


git-svn-id: https://bucket.mit.edu/svn/nilm/acquisition/ethstream@7282 ddd99763-3ecb-0310-9145-efcb8ce7c51f
This commit is contained in:
zacharyc 2009-03-13 20:33:52 +00:00
parent 1a2ed51d0c
commit 0ed2935deb
3 changed files with 66 additions and 29 deletions

12
ethstream.c
View File

@ -360,26 +360,26 @@ int nerdDoStream(const char *address, int *channel_list, int channel_count, int
int fd_data;
static int first_call = 1;
static int started = 0;
char command[14];
getPacket command;
static unsigned short currentcount = 0;
usleep(1000000);
//usleep(1000000);
if(first_call) {
if (nerd_generate_command(command, channel_list, channel_count, precision, period) < 0) {
if (nerd_generate_command(&command, channel_list, channel_count, precision, period) < 0) {
info("Failed to create configuration command\n");
goto out;
}
if (nerd_send_command(address,"STOP") < 0) {
if (nerd_send_command(address,"STOP", 4) < 0) {
if (first_call)
retval = -ENOTCONN;
info("Failed to send STOP command\n");
goto out;
}
if (nerd_send_command(address,command) < 0) {
if (nerd_send_command(address,&command, sizeof(command)) < 0) {
info("Failed to send GET command\n");
goto out;
}
@ -392,7 +392,7 @@ int nerdDoStream(const char *address, int *channel_list, int channel_count, int
if(started == 1) {
char cmdbuf[10];
sprintf(cmdbuf,"SETC%05hd",currentcount);
if (nerd_send_command(address,cmdbuf) < 0) {
if (nerd_send_command(address,cmdbuf,strlen(cmdbuf)) < 0) {
info("Failed to send SETC command\n");
goto out;
}

69
nerdjack.c
View File

@ -33,6 +33,16 @@ typedef struct {
int * destlist;
} deststruct;
typedef struct __attribute__((__packed__)) {
unsigned char headerone;
unsigned char headertwo;
unsigned short packetNumber;
unsigned long lwipmemoryused;
unsigned short adcused;
unsigned short packetsready;
signed short data[NERDJACK_NUM_SAMPLES];
} dataPacket;
/* Choose the best ScanConfig and ScanInterval parameters for the
desired scanrate. Returns -1 if no valid config found */
int nerdjack_choose_scan(double desired_rate, double *actual_rate, int *period)
@ -126,7 +136,7 @@ int nerdjack_detect(char * ipAddress) {
return 0;
}
int nerd_send_command(const char * address, char * command)
int nerd_send_command(const char * address, void * command, int length)
{
int ret,fd_command;
char buf[3];
@ -137,9 +147,9 @@ int nerd_send_command(const char * address, char * command)
}
/* Send request */
ret = send_all_timeout(fd_command, command, strlen(command), 0,
ret = send_all_timeout(fd_command, command, length, 0,
& (struct timeval) { .tv_sec = NERDJACK_TIMEOUT });
if (ret < 0 || ret != strlen(command)) {
if (ret < 0 || ret != length) {
verb("short send %d\n", (int)ret);
return -1;
}
@ -209,11 +219,12 @@ return numDuplicates;
int nerd_data_stream(int data_fd, int numChannels, int *channel_list, int precision, int convert, int lines, int showmem, unsigned short * currentcount)
{
//Variables that should persist across retries
static unsigned char buf[NERDJACK_PACKET_SIZE];
static dataPacket buf;
static int linesleft = 0;
static int linesdumped = 0;
int index = 0;
int charsprocessed = 0;
int alignment = 0;
signed short datapoint = 0;
unsigned short dataline[NERDJACK_CHANNELS];
@ -247,7 +258,7 @@ int nerd_data_stream(int data_fd, int numChannels, int *channel_list, int precis
//Loop forever to grab data
while((charsread = recv_all_timeout(data_fd,buf,NERDJACK_PACKET_SIZE,0,
while((charsread = recv_all_timeout(data_fd,&buf,NERDJACK_PACKET_SIZE,0,
& (struct timeval) { .tv_sec = NERDJACK_TIMEOUT }))){
//We want a complete packet, so take the chars so far and keep waiting
@ -259,13 +270,14 @@ int nerd_data_stream(int data_fd, int numChannels, int *channel_list, int precis
}
//First check the header info
if(buf[0] != 0xF0 || buf[1] != 0xAA) {
if(buf.headerone != 0xF0 || buf.headertwo != 0xAA) {
info("No Header info\n");
return -1;
}
//Check counter info to make sure not out of order
tempshort = (buf[2] << 8) | buf[3];
tempshort = ntohs(buf.packetNumber);
//tempshort = (buf[2] << 8) | buf[3];
if(tempshort != *currentcount ){
info("Count wrong. Expected %hd but got %hd\n", *currentcount, tempshort);
return -1;
@ -275,10 +287,13 @@ int nerd_data_stream(int data_fd, int numChannels, int *channel_list, int precis
*currentcount = *currentcount + 1;
//Process the rest of the header and update the index value to be pointing after it
index = 12;
memused = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | (buf[7]);
adcused = (buf[8] << 8) | (buf[9]);
packetsready = (buf[10] << 8) | (buf[11]);
charsprocessed = 12;
memused = ntohl(buf.lwipmemoryused);
//memused = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | (buf[7]);
adcused = ntohs(buf.adcused);
//adcused = (buf[8] << 8) | (buf[9]);
packetsready = ntohs(buf.packetsready);
//packetsready = (buf[10] << 8) | (buf[11]);
alignment = 0;
numgroups = 0;
@ -287,10 +302,12 @@ int nerd_data_stream(int data_fd, int numChannels, int *channel_list, int precis
continue;
}
index = 0;
//While there is still more data in the packet, process it
//use the destination structure to load the line before printing
while(charsread > index) {
datapoint = (buf[index] << 8 | buf[index+1]);
while(charsread > charsprocessed) {
datapoint = ntohs(buf.data[index]);
//datapoint = (buf[index] << 8 | buf[index+1]);
switch(convert) {
case CONVERT_VOLTS:
if(alignment <= 5) {
@ -313,8 +330,9 @@ int nerd_data_stream(int data_fd, int numChannels, int *channel_list, int precis
}
//Each point is two bytes, so increment index and total bytes read
index++;
index++;
charsprocessed++;
charsprocessed++;
index++;
alignment++;
//totalread++;
@ -368,6 +386,7 @@ int nerd_data_stream(int data_fd, int numChannels, int *channel_list, int precis
}
}
index = 0;
charsprocessed = 0;
}
return 0;
@ -425,17 +444,27 @@ int nerd_open(const char *address,int port) {
}
//Generate an appropriate sample initiation command
int nerd_generate_command(char * command, int * channel_list, int channel_count, int precision,
unsigned short period) {
int nerd_generate_command(getPacket * command, int * channel_list, int channel_count, int precision,
unsigned long period) {
int channelbit = 0;
short channelbit = 0;
int i;
for( i = 0; i < channel_count; i++) {
channelbit = channelbit | (0x1 << channel_list[i]);
}
sprintf(command,"GETD%3.3X%d%5.5d", channelbit,precision,period);
//command->word = "GETD";
command->word[0] = 'G';
command->word[1] = 'E';
command->word[2] = 'T';
command->word[3] = 'D';
command->channelbit = htons(channelbit);
command->precision = precision;
command->period = htonl(period);
command->prescaler = 0;
//sprintf(command,"GETD%3.3X%d%5.5d", channelbit,precision,period);
return 0;

14
nerdjack.h
View File

@ -24,16 +24,24 @@
#define NERDJACK_PACKET_SIZE 1460
#define NERDJACK_NUM_SAMPLES 724
typedef struct __attribute__((__packed__)) {
char word[4];
unsigned short channelbit;
unsigned char precision;
unsigned long period;
unsigned char prescaler;
} getPacket;
/* Open/close TCP/IP connection to the NerdJack */
int nerd_open(const char *address,int port);
int nerd_close_conn(int data_fd);
/* Generate the command word for the NerdJack */
int nerd_generate_command(char * command, int * channel_list, int channel_count, int precision,
unsigned short period);
int nerd_generate_command(getPacket * command, int * channel_list, int channel_count, int precision,
unsigned long period);
/* Send given command to NerdJack */
int nerd_send_command(const char * address, char * command);
int nerd_send_command(const char * address, void * command, int length);
/* Stream data out of the NerdJack */
int nerd_data_stream(int data_fd, int numChannels, int * channel_list, int precision, int convert, int lines, int showmem, unsigned short * currentcount);