sml_card.tc

sml_card.tc — render ANY SML meter's values inside a TinyC slot card

Source on GitHub

// ============================================================================
// sml_card.tc — render ANY SML meter's values inside a TinyC slot card
// ============================================================================
//
// Problem: SML meter values are drawn by the SML driver itself (xsns_53,
// FUNC_WEB_SENSOR) as bare {s}{m}{e} rows, so they float OUTSIDE the per-slot
// "cards" that TinyC WebCall() scripts get on the main web page. Wrapping the
// driver's output in its own card would just produce a SECOND card next to any
// script that already renders.
//
// Solution (no per-meter editing — works with every descriptor):
//   1. Suppress the SML driver's own web rendering with the smlj bit
//      SML_OPTIONS_NO_WEB (4):  tasm_smlj = tasm_smlj | 4
//      (firmware: xsns_53_sml.ino skips SML_Show(0) when this bit is set).
//   2. Read /sml_meter.def, parse each value line for its display name (field 3)
//      and unit (field 4), and re-render them here in WebCall() — so they land
//      inside THIS slot's card (one card, no duplicate).
//
// A value line looks like:   1,010404UUuu@i0:10,Netzspannung,V,mainsv,1
//   field 1 = meter#   field 2 = obis@idx:scale   field 3 = NAME
//   field 4 = UNIT     field 5 = json name        field 6 = decimals
// The Nth value line (in file order) corresponds to smlGet(N)  (1-based;
// smlGet(0) returns the value count).
//
// Requires firmware with the SML_OPTIONS_NO_WEB bit (>= 1.6.41) + USE_SML_M +
// USE_UFILESYS. Drop this into a free slot, autoexec on — done.
// ============================================================================

char defbuf[1600];      // raw descriptor text (one fileRead of /sml_meter.def)
char names[24][24];     // cached display name per value (descriptor field 3)
char units[24][8];      // cached unit per value         (descriptor field 4)
char line[160];         // scratch: one descriptor line
char buf[96];           // scratch: one rendered table row
int  nval;              // number of value lines parsed

// ── Parse the descriptor once: cache name + unit for every value line ───────
void parse_def() {
  int h; int total; int p; int q;
  nval = 0;
  h = fileOpen("/sml_meter.def", "r");
  if (h < 0) { return; }
  total = fileRead(h, defbuf, 1599);
  fileClose(h);
  if (total < 0) { total = 0; }
  defbuf[total] = 0;
  p = 0;
  while (p < total && nval < 24) {
    // copy one line (up to LF) into 'line'
    q = 0;
    while (p < total && defbuf[p] != 10 && q < 159) { line[q] = defbuf[p]; q++; p++; }
    line[q] = 0;
    while (p < total && (defbuf[p] == 10 || defbuf[p] == 13)) { p++; }
    // value lines start with a meter number (1..9) followed by ','
    // (header '>M', comment ';'/'#' and meter '+1,' lines are skipped)
    if (line[0] >= '1' && line[0] <= '9' && line[1] == ',') {
      webParse(line, ",", 3, names[nval]);   // 1-based field 3 = display name
      webParse(line, ",", 4, units[nval]);   // 1-based field 4 = unit
      nval++;
    }
  }
}

void main() {
  tasm_smlj = tasm_smlj | 4;   // SML_OPTIONS_NO_WEB: silence the driver's web rows
  parse_def();
}

// ── Draw every value as a {s}name{m}value unit{e} row inside this slot's card ─
void WebCall() {
  int i;
  i = 0;
  while (i < nval) {
    sprintf(buf, "{s}%s{m}%.2f %s{e}", names[i], smlGet(i + 1), units[i]);
    webSend(buf);
    i++;
  }
}