contiki/platform/stepper-robot/stepper-process.c

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#include <stepper-process.h>
#include <stepper-steps.h>
#include <stepper.h>
#include <stepper-move.h>
#include <string.h>
#include <interrupt-utils.h>
#include <stdio.h>
#include <unistd.h>
#include <net/uip.h>
#include <dev/cc2420.h>
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#undef putchar
static unsigned int
parse_uint_hex(const char **pp, const char *end)
{
unsigned int v = 0;
while(*pp < end) {
char ch;
if ((ch = **pp) >= '0' && ch <= '9') {
v = v* 16 + (ch - '0');
} else if (ch >= 'A' && ch <= 'F') {
v = v* 16 + (ch - 'A') + 10;
} else break;
(*pp)++;
}
return v;
}
static int
parse_int_hex(const char **pp, const char *end)
{
if (*pp == end) return 0;
if (**pp == '-') {
(*pp)++;
return -parse_uint_hex(pp, end);
} else {
return parse_uint_hex(pp, end);
}
}
static void
skip_white(const char **pp, const char *end)
{
char ch;
while(*pp < end && ((ch = **pp) == ' ' || ch == '\t')) (*pp)++;
}
static const char hex_chars[] =
{'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
static void
format_uint_hex(char **str, char *end, unsigned int v)
{
char buffer[10];
char *p = buffer+10;
if (*str == end) return;
if (v == 0) {
*(*str)++ = '0';
return;
}
while(v > 0) {
*--p = hex_chars[v&0xf];
v >>= 4;
}
while((p < buffer+10) && (*str < end)) {
*(*str)++ = *p++;
}
}
static void
format_int_hex(char **str, char *end, int v)
{
if (v < 0) {
if (*str == end) return;
*(*str)++ = '-';
v = -v;
}
format_uint_hex(str, end, v);
}
static void
format_ull_hex(char **str, char *end, unsigned long long int v)
{
char buffer[16];
char *p = buffer+10;
if (*str == end) return;
if (v == 0) {
*(*str)++ = '0';
return;
}
while(v > 0) {
*--p = hex_chars[v&0xf];
v >>= 4;
}
while((p < buffer+10) && (*str < end)) {
*(*str)++ = *p++;
}
}
static void
format_ll_hex(char **str, char *end, long long v)
{
if (v < 0) {
if (*str == end) return;
*(*str)++ = '-';
v = -v;
}
format_ull_hex(str, end, v);
}
typedef struct _ReplyBuffer ReplyBuffer;
struct _ReplyBuffer
{
char buffer[70]; /* Should be small enough to fit in one packet */
char *write;
};
static ReplyBuffer tcp_reply;
static ReplyBuffer udp_reply;
#define REPLY_BUFFER_END(reply) ((reply)->buffer+sizeof((reply)->buffer))
#define REPLY_BUFFER_LEFT(reply) \
((reply)->buffer+sizeof((reply)->buffer) - (reply)->write)
static void
reply_char(ReplyBuffer *reply, char c)
{
if (REPLY_BUFFER_LEFT(reply) > 0) {
*reply->write++ = c;
}
}
static void
reply_str(ReplyBuffer *reply, char *str)
{
while(reply->write < REPLY_BUFFER_END(reply) && *str != '\0')
*reply->write++ = *str++;
}
static void
stepper_reply(ReplyBuffer *reply, StepperResult res)
{
switch(res) {
case STEPPER_OK:
reply_str(reply, "OK");
break;
case STEPPER_ERR_MEM:
reply_str(reply, "ERR MEM");
break;
case STEPPER_ERR_TOO_LATE:
reply_str(reply, "ERR LATE");
break;
case STEPPER_ERR_INDEX: /* Sholdn't happen here */
reply_str(reply, "ERR INDEX");
break;
default:
reply_str(reply, "ERR");
}
reply_char(reply, '\n');
}
#define CHECK_INPUT_LEFT(x) \
do {\
if ((x) > inend - input_line) {reply_str(reply, "ERR\n");return 0;}\
} while(0)
static int
handle_line(const char *input_line, const char *inend, ReplyBuffer *reply)
{
unsigned long when;
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#if 0
{
const char *p = input_line;
printf("Got line: '");
while(p < inend) {
putchar(*p++);
}
printf("'\n");
fsync(1);
}
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#endif
skip_white(&input_line, inend);
CHECK_INPUT_LEFT(1);
if (*input_line == '#') {
input_line++;
reply_char(reply, '#');
while (input_line < inend &&*input_line != ' ') {
reply_char(reply, *input_line++);
}
reply_char(reply, ' ');
}
skip_white(&input_line, inend);
if (*input_line == '@') {
input_line++;
when = parse_uint_hex(&input_line, inend);
} else {
when = stepper_current_period() + 3;
}
skip_white(&input_line, inend);
CHECK_INPUT_LEFT(1);
if (input_line[0] == 'L' || input_line[0] == 'R') {
unsigned int stepper_index = (input_line[0] == 'R' ? 1 : 0);
CHECK_INPUT_LEFT(1);
input_line++;
if (input_line[0] == 'S') {
int speed;
input_line++;
if (input_line == inend) {
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/* printf("Speed: %ld\n",
stepper_current_velocity(stepper_index)/VEL_SCALE);*/
reply_char(reply, input_line[-2]);
reply_char(reply, 'S');
format_int_hex(&reply->write, REPLY_BUFFER_END(reply),
stepper_current_velocity(stepper_index)/VEL_SCALE);
reply_char(reply, '\n');
} else {
speed = parse_int_hex(&input_line, inend);
if (*input_line == ',') {
StepperResult res;
unsigned int acc;
input_line++;
acc = parse_uint_hex(&input_line, inend);
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/* printf("Speed=%d, Acc=%u\n", speed, acc); */
res = stepper_set_velocity(stepper_index, &when,
acc, speed*VEL_SCALE);
stepper_reply(reply, res);
} else {
reply_str(reply, "ERR\n");
}
}
} else if (input_line[0] == 'C') {
reply_char(reply, input_line[-1]);
reply_char(reply, 'C');
format_ll_hex(&reply->write, REPLY_BUFFER_END(reply),
stepper_current_step(stepper_index));
reply_char(reply, '\n');
} else if (input_line[0] == 'M') {
unsigned int speed;
unsigned int acc;
int move;
input_line++;
speed = parse_uint_hex(&input_line, inend);
CHECK_INPUT_LEFT(1);
if (*input_line == ',') {
input_line++;
acc = parse_uint_hex(&input_line, inend);
if (*input_line == ',') {
StepperResult res;
input_line++;
move = parse_int_hex(&input_line, inend);
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/*printf("Speed=%u, Acc=%u, Move=%d\n", speed, acc, move);*/
res = stepper_move(stepper_index, &when,
acc,speed*VEL_SCALE,move*DIST_SCALE);
stepper_reply(reply, res);
} else {
reply_str(reply, "ERR\n");
}
} else {
reply_str(reply, "ERR\n");
}
} else {
reply_str(reply, "ERR\n");
}
} else if (input_line[0] == 'E') {
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STEPPER_ENABLE();
printf("Stepper enabled\n");
reply_str(reply, "OK\n");
} else if (input_line[0] == 'D') {
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STEPPER_DISABLE();
printf("Stepper disabled\n");
reply_str(reply, "OK\n");
} else if (input_line[0] == 'p') {
reply_char(reply, 'p');
format_int_hex(&reply->write, REPLY_BUFFER_END(reply), cc2420_last_rssi);
reply_char(reply, ',');
format_uint_hex(&reply->write, REPLY_BUFFER_END(reply),
cc2420_last_correlation);
reply_char(reply, '\n');
} else if (input_line[0] == 'T') {
reply_char(reply, 'T');
format_int_hex(&reply->write, REPLY_BUFFER_END(reply),
stepper_current_period());
reply_char(reply, '\n');
} else if (input_line[0] == 'q') {
return 1;
} else {
reply_str(reply, "ERR\n");
}
return 0;
}
static unsigned int transmit_len = 0;
static void
send_reply()
{
if (transmit_len == 0) {
transmit_len = tcp_reply.write - tcp_reply.buffer;
if (transmit_len > 0) {
/* printf("Sending len = %d\n", transmit_len); */
uip_send(tcp_reply.buffer, transmit_len);
}
}
}
static void
handle_connection()
{
static char exiting = 0;
static char line_buffer[100];
static char *line_end;
if (uip_connected()) {
exiting = 0;
transmit_len = 0;
line_end = line_buffer;
tcp_reply.write = tcp_reply.buffer;
reply_str(&tcp_reply, "Ready\n");
send_reply();
}
if (uip_acked()) {
if (tcp_reply.write - tcp_reply.buffer > transmit_len) {
memmove(tcp_reply.buffer, tcp_reply.buffer + transmit_len,
tcp_reply.write - tcp_reply.buffer - transmit_len);
}
tcp_reply.write -= transmit_len;
/* printf("Acked: %d left\n", reply_buffer.write-reply_buffer.buffer); */
transmit_len = 0;
if (exiting && tcp_reply.write == tcp_reply.buffer) {
uip_close();
exiting = 0;
}
}
if (uip_newdata()) {
const char *read_pos = uip_appdata;
const char *read_end = read_pos + uip_len;
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/* printf("Got data\n"); */
while(read_pos < read_end) {
if (line_end == line_buffer+sizeof(line_buffer)) {
/* Buffer too small, just discard everything */
line_end = line_buffer;
}
*line_end++ = *read_pos++;
if (line_end[-1] == '\n' || line_end[-1] == '\r' || line_end[-1] == ';'){
if (line_end - 1 != line_buffer) {
if (handle_line(line_buffer, line_end - 1, &tcp_reply)) {
send_reply();
/* Postpone closing if there's reply data left to be sent. */
if (transmit_len == 0)
uip_close();
else
exiting = 1;
break;
}
}
line_end = line_buffer;
}
}
send_reply();
}
if (uip_poll()) {
send_reply();
}
if(uip_rexmit()) {
printf("Retransmit\n");
if (transmit_len > 0)
uip_send(tcp_reply.buffer, transmit_len);
}
}
PROCESS(udp_stepper_process, "UDP stepper process");
PROCESS_THREAD(udp_stepper_process, ev, data)
{
static struct etimer timer;
static struct uip_udp_conn *conn;
static char listening = 1; /* Listen for connections from anyone */
static uip_ipaddr_t any;
PROCESS_EXITHANDLER(goto exit);
PROCESS_BEGIN();
printf("udp_stepper_process starting\n");
uip_ipaddr(&any, 0,0,0,0);
conn = udp_new(&any, HTONS(0), NULL);
if (!conn) goto exit;
uip_udp_bind(conn, HTONS(1010));
etimer_set(&timer, CLOCK_SECOND*2);
while(1) {
PROCESS_YIELD();
if(ev == tcpip_event) {
if (uip_newdata()) {
struct uip_udpip_hdr *header = (struct uip_udpip_hdr *)uip_buf;
const char *line_start = uip_appdata;
const char *line_end = line_start;
const char *packet_end = line_start + uip_len;
udp_reply.write = udp_reply.buffer;
while(line_end < packet_end) {
if (*line_end == '\n' || *line_end == '\r' || *line_end == ';' ) {
if (line_end != line_start) {
handle_line(line_start, line_end, &udp_reply);
}
line_start = line_end+1;
}
line_end++;
}
/* Check if we are connected to a client, if not reconnect */
if (listening) {
uip_udp_remove(conn);
conn = udp_new(&header->srcipaddr, header->srcport, &conn);
if (!conn) goto exit;
uip_udp_bind(conn, HTONS(1010));
listening = 0;
}
etimer_reset(&timer);
tcpip_poll_udp(conn);
} else if (uip_poll()) {
if (data == &conn) {
uip_send(udp_reply.buffer, udp_reply.write - udp_reply.buffer);
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/* printf("sent %ld\n", udp_reply.write - udp_reply.buffer); */
}
}
} else if (ev == PROCESS_EVENT_TIMER) {
uip_udp_remove(conn);
conn = udp_new(&any, HTONS(0), NULL);
if (!conn) goto exit;
uip_udp_bind(conn, HTONS(1010));
listening = 1;
}
}
exit:
/* Contiki does automatic garbage collection of uIP state and we
* need not worry about that. */
printf("udprecv_process exiting\n");
PROCESS_END();
}
PROCESS(stepper_process, "Stepper control process");
PROCESS_THREAD(stepper_process, ev, data)
{
PROCESS_EXITHANDLER(goto exit);
PROCESS_BEGIN();
tcp_listen(HTONS(1010));
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process_start(&udp_stepper_process, NULL);
printf("Stepper starting\n");
while(1) {
PROCESS_WAIT_EVENT_UNTIL(ev == tcpip_event);
if(uip_connected()) {
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/* printf("connected\n"); */
handle_connection(); /* Initialise parser */
while(!(uip_aborted() || uip_closed() || uip_timedout())) {
PROCESS_WAIT_EVENT_UNTIL(ev == tcpip_event);
handle_connection();
}
}
printf("disconnected\n");
}
exit:
/* Contiki does automatic garbage collection of uIP state and we
* need not worry about that. */
printf("Stepper exiting\n");
PROCESS_END();
}