Merge pull request #8900 from tthk/development

Add support for 0.56" 7-Segment LED Backpack with floating point and raw segment addressing

tasmota/my_user_config.h

@@ -563,6 +563,9 @@
                                                  // MTX_ADDRESS2 at y=1, up to MTX_ADDRESS8 at y=7
                                                  // Command: DisplayText [yn]8888
                                                  // will display 8888 at sevenseg display at I2C address MTX_ADDRESS(n-1)
+                                                 // Each segment may be address Command: DisplayText [xn]m
+                                                 //  where n is 0..4 (4 digits and middle :) and m is decimal for bitmap of which segment to turn on.
+                                                 // Reference: https://cdn-learn.adafruit.com/downloads/pdf/adafruit-led-backpack.pdf
     // #define SEVENSEG_ADDRESS1     0x70      // No longer used.  Use MTX_ADDRESS1 - MTX_ADDRESS8 instead to specify I2C address of sevenseg displays
 //    #define USE_DISPLAY_SH1106                   // [DisplayModel 7] [I2cDriver6] Enable SH1106 Oled 128x64 display (I2C addresses 0x3C and 0x3D)
 #endif  // USE_I2C

tasmota/xdsp_11_sevenseg.ino

@@ -106,16 +106,18 @@ void SevensegOnOff(void)
 
 void SevensegDrawStringAt(uint16_t x, uint16_t y, char *str, uint16_t color, uint8_t flag)
 {
-  uint16_t number = 0;
+  enum OutNumType {DECIMAL, HEXADECIMAL, FLOAT, SEGMENTS};
+  int16_t number = 0;
+  double numberf = 0;
   boolean hasnumber= false;
   uint8_t dots= 0;
-  boolean t=false;
+  OutNumType outnumtype= DECIMAL;
-  boolean T=false;
+  uint8 fds = 0; // number of fractional digits for fp number
-  boolean d=false;
-  boolean hex=false;
   boolean done= false;
   boolean s= false;
   uint8_t unit= y;
+  char *buf;
+
   if ((unit>=sevensegs) || (unit<0)) {
     unit=0;
   }
@@ -123,16 +125,19 @@ void SevensegDrawStringAt(uint16_t x, uint16_t y, char *str, uint16_t color, uin
   for (int i=0; (str[i]!='\0') && (!done); i++) {
     // [optional prefix(es) chars]digits
     // Some combinations won't make sense.
-    // Reference: https://learn.adafruit.com/adafruit-led-backpack/1-2-inch-7-segment-backpack-arduino-wiring-and-setup
+    // Reference: https://cdn-learn.adafruit.com/downloads/pdf/adafruit-led-backpack.pdf
+    // This code has been tested on 1.2" and 0.56" 7-Segment LED displays, but should mostly work for others.
     // 
     // Prefixes:
-    // x  upcoming number decimal integer displayed as hex
+    // x  upcoming decimal integer number displayed as hex
     // :  turn on middle colon
     // ^  turn on top left dot
     // v  turn on bottom left dot
     // .  turn on AM/PM/Degree dot
     // s  upcoming number is seconds, print as HH:MM or MM:SS
     // z  clear this display
+    // f  upcoming number is floating point
+    // r  raw segment based on bitmap of upcoming integer number (see reference document above)
     // 
     // Some sample valid combinations:
     //  787     -> 787
@@ -142,10 +147,19 @@ void SevensegDrawStringAt(uint16_t x, uint16_t y, char *str, uint16_t color, uin
     //  s1241   -> 20:41
     //  z       ->
     //  x88     -> 58
+    //  f8.5    -> 8.5
+    //  f-9.34  -> -9.34
+    //  f:-9.34 -> -9.:34
+    //  r255    -> 8. (all 8 segments on)
 
     switch (str[i]) {
       case 'x': // print given dec value as hex
-        hex = true;
+        // hex = true;
+        outnumtype = HEXADECIMAL;
+        break;
+      case 'f': // given number is floating point number
+        // fp = true;
+        outnumtype = FLOAT;
         break;
       case ':': // print colon
         dots |= 0x02;
@@ -162,6 +176,7 @@ void SevensegDrawStringAt(uint16_t x, uint16_t y, char *str, uint16_t color, uin
       case 's': // duration in seconds
         s = true;
         break;
+      case '-':
       case '0':
       case '1':
       case '2':
@@ -173,7 +188,21 @@ void SevensegDrawStringAt(uint16_t x, uint16_t y, char *str, uint16_t color, uin
       case '8':
       case '9':
         hasnumber= true;
+        if (outnumtype == FLOAT) {
+          // Floating point number is given
+          numberf = atof(str+i);
+          // Find number of fractional digits
+          buf= str+i;
+          char *cp= strchr(buf, '.');
+          if (cp == NULL) {
+            fds= 0;
+          } else {
+            fds= buf+strlen(buf) - 1 - cp;
+          }
+        } else {
+          // Integer is given
           number = atoi(str+i);
+        }
         done = true;
         break;
       case 'z': // Clear this display
@@ -182,14 +211,18 @@ void SevensegDrawStringAt(uint16_t x, uint16_t y, char *str, uint16_t color, uin
         s=false;
         sevenseg[unit]->clear();
         break;
+      case 'r': // Raw segment
+        outnumtype= SEGMENTS;
+        break;
       default: // unknown format, ignore
         break;
     }
   }
 
+
+  if (hasnumber) {
     if (s) {
       // number is duration in seconds
-    hex = false;
       int hour = number/60/60;
       int minute = (number/60)%60;
 
@@ -202,10 +235,17 @@ void SevensegDrawStringAt(uint16_t x, uint16_t y, char *str, uint16_t color, uin
       }
     }
 
-  if (hasnumber) {
+    if (outnumtype == HEXADECIMAL) {
-    if (hex) {
+      // Hex
       sevenseg[unit]->print(number, HEX);
+    } else if (outnumtype == FLOAT) {
+      // Floating point
+      sevenseg[unit]->printFloat(numberf, fds, 10);
+    } else if (outnumtype == SEGMENTS) {
+      // Raw segments
+      sevenseg[unit]->writeDigitRaw(x, number);
     } else {
+      // Decimal
       sevenseg[unit]->print(number, DEC);
     }
   }