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114 lines
2.5 KiB
114 lines
2.5 KiB
#include <esp8266.h>
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#include <httpd.h>
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#include "page_waveform.h"
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#include "sampling.h"
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#include "serial.h"
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#include "payload_parser.h"
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// -------------------------------------------------------------------------------
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// Read multiple samples from the ADC as JSON
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typedef struct {
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uint16_t total_count;
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uint16_t done_count;
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bool success;
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} tplReadSamplesJSON_state;
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int FLASH_FN tplWaveformJSON(HttpdConnData *connData, char *token, void **arg)
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{
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char buff20[20];
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tplReadSamplesJSON_state *st = *arg;
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if (token == NULL) {
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// end of template, cleanup
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if (st != NULL) free(st);
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return HTTPD_CGI_DONE; // cleanup
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}
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if (st == NULL) {
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// first call - allocate the struct
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st = malloc(sizeof(tplReadSamplesJSON_state));
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*arg = st;
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// check how many samples are requested
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uint16_t count = 1;
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int len = httpdFindArg(connData->getArgs, "n", buff20, sizeof(buff20));
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if (len != -1) count = (uint16_t)atoi(buff20);
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if (count > 4096) {
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warn("Requested %d samples, capping at 4096.", count);
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count = 4096;
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}
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st->total_count = count;
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st->done_count = 0;
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st->success = true; // success true by default
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// REQUEST THE DATA
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meas_request_data(st->total_count);
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}
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// the "success" field is after the data,
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// so if readout fails, success can be set to false.
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if (strcmp(token, "values") == 0) {
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// Wait for a chunk
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uint8_t *chunk = NULL;
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uint16_t chunk_len = 0;
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// 5 secs or 500 ms
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for (int i = 0; i < (st->done_count == 0 ? 5000*100: 500*100); i++) {
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uart_poll();
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if (meas_chunk_ready()) break;
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os_delay_us(10); // 1 ms
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system_soft_wdt_feed();
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}
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chunk = meas_get_chunk(&chunk_len);
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if (!chunk) {
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// abort, proceed to the next field.
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meas_close();
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st->success = false;
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return HTTPD_CGI_DONE;
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}
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PayloadParser pp = pp_start(chunk, chunk_len);
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// chunk of data...
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for (; pp.ptr < pp.len; st->done_count++) {
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// preceding comma if not the first number
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if (st->done_count > 0) {
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httpdSend(connData, ", ", 2);
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}
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uint32_t samp = pp_u32(&pp);
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// print the number
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os_sprintf(buff20, "%d", samp);
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httpdSend(connData, buff20, -1);
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}
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// wait for more in this substitution
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if (st->done_count < st->total_count) {
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meas_request_next_chunk();
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return HTTPD_CGI_MORE; // more numbers to come
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} else {
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// we're done
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meas_close();
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return HTTPD_CGI_DONE;
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}
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} else if (strcmp(token, "success") == 0) {
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// success status
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httpdSend(connData, (st->success ? "true" : "false"), -1);
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}
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return HTTPD_CGI_DONE;
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}
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