ESP8266 part of the f105-motor-demo project (see f105-motor-demo_stm32)
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/*
Some random cgi routines. Used in the LED example and the page that returns the entire
flash as a binary. Also handles the hit counter on the main page.
*/
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* Jeroen Domburg <jeroen@spritesmods.com> wrote this file. As long as you retain
* this notice you can do whatever you want with this stuff. If we meet some day,
* and you think this stuff is worth it, you can buy me a beer in return.
* ----------------------------------------------------------------------------
*/
#include <esp8266.h>
#include "cgi.h"
#include "uptime.h"
#include "datalink.h"
#include "sampling.h"
#include "serial.h"
// -------------------------------------------------------------------------------
// Read multiple samples from the ADC as JSON
typedef struct {
uint16_t total_count;
uint16_t done_count;
bool success;
} tplReadSamplesJSON_state;
int FLASH_FN tplReadSamplesJSON(HttpdConnData *connData, char *token, void **arg)
{
char buff20[20];
tplReadSamplesJSON_state *st = *arg;
if (token == NULL) {
// end of template, cleanup
if (st != NULL) free(st);
return HTTPD_CGI_DONE; // cleanup
}
if (st == NULL) {
// first call - allocate the struct
st = malloc(sizeof(tplReadSamplesJSON_state));
*arg = st;
// check how many samples are requested
uint16_t count = 1;
int len = httpdFindArg(connData->getArgs, "count", buff20, sizeof(buff20));
if (len != -1) count = (uint16_t)atoi(buff20);
if (count > 4096) {
warn("Requested %d samples, capping at 4096.", count);
count = 4096;
}
st->total_count = count;
st->done_count = 0;
st->success = true; // success true by default
// REQUEST THE DATA
meas_request_data(st->total_count);
}
// the "success" field is after the data,
// so if readout fails, success can be set to false.
if (strcmp(token, "values") == 0) {
// Wait for a chunk
uint8_t *chunk = NULL;
uint16_t chunk_len = 0;
// 5 secs or 500 ms
for (int i = 0; i < (st->done_count == 0 ? 5000*100: 500*100); i++) {
uart_poll();
if (meas_chunk_ready()) break;
os_delay_us(10); // 1 ms
system_soft_wdt_feed();
}
chunk = meas_get_chunk(&chunk_len);
if (!chunk) {
// abort, proceed to the next field.
meas_close();
st->success = false;
return HTTPD_CGI_DONE;
}
PayloadParser pp = pp_start(chunk, chunk_len);
// chunk of data...
for (; pp.ptr < pp.len; st->done_count++) {
// preceding comma if not the first number
if (st->done_count > 0) {
httpdSend(connData, ", ", 2);
}
uint32_t samp = pp_u32(&pp);
// print the number
os_sprintf(buff20, "%d", samp);
httpdSend(connData, buff20, -1);
}
// wait for more in this substitution
if (st->done_count < st->total_count) {
meas_request_next_chunk();
return HTTPD_CGI_MORE; // more numbers to come
} else {
// we're done
meas_close();
return HTTPD_CGI_DONE;
}
} else if (strcmp(token, "success") == 0) {
// success status
httpdSend(connData, (st->success ? "true" : "false"), -1);
}
return HTTPD_CGI_DONE;
}
// Example of multi-pass generation of a html file
/*
// better to put it in the fs...
int FLASH_FN cgiRandomNumbers(HttpdConnData *connData) {
RandomNumberState *rns=connData->cgiData;
char buff[128];
if (connData->conn == NULL) {
//Connection aborted. Clean up.
if (rns != NULL) free(rns);
return HTTPD_CGI_DONE;
}
if (rns == NULL) {
//First call to this cgi. Open the file so we can read it.
rns=(RandomNumberState *)malloc(sizeof(RandomNumberState));
connData->cgiData=rns;
// parse count
uint32_t count = 1;
int len = httpdFindArg(connData->getArgs, "count", buff, sizeof(buff));
if (len==-1) {
// no such get arg
} else {
count = (uint32_t)atoi(buff);
}
rns->count_remain = count;
printf("User wants %d numbers.", count);
httpdStartResponse(connData, 200);
httpdHeader(connData, "Content-Type", "text/html");
httpdEndHeaders(connData);
// start the page
httpdSend(connData, "<!DOCTYPE html>"
"<html>"
"<head>"
" <title>Generated page.</title>"
" <link rel=\"stylesheet\" type=\"text/css\" href=\"style.css\">"
"</head>"
"<body>"
"<div id=\"main\">"
"<h1>Random numbers:</h1>"
"<ul>", -1);
return HTTPD_CGI_MORE;
}
// send end of the page
if (rns->count_remain == 0) {
httpdSend(connData, "</ul></body></html>", -1);
free(rns);
return HTTPD_CGI_DONE;
}
// print chunk of data
for (int i = 0; i < 100; i++) {
os_sprintf(buff, "<li>%lu\n", os_random());
httpdSend(connData, buff, -1);
if (--rns->count_remain == 0) {
break;
}
}
return HTTPD_CGI_MORE;
}
*/