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LED_96x8_matrix.cpp

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+/*
+  LED_96x8_matrix.cpp
+
+  MIT License
+  Copyright (c) 2023 hdrlux
+*/
+
+#include <Arduino.h>     // for all the 'standard' Arduino stuff
+#include <MD_MAX72xx.h>  // https://github.com/MajicDesigns/MD_MAX72XX
+#include "LED_96x8_matrix.h"
+#include "Font_data.h"
+#include "RTC_com.h"  // for Sync_Err
+
+// Define the number of devices we have in the chain and the hardware interface
+#define MAX_DEVICES 12                     // total amount of 8x8 LED segments
+#define LEFT_DEVICES 5                     // amount of 8x8 LED segments in left zone
+#define HARDWARE_TYPE MD_MAX72XX::FC16_HW  // check if you get strange pixel print
+#define CLK_PIN 13                         // or SCK [is also onboard LED on Nano]
+#define DATA_PIN 11                        // or MOSI
+#define CS_PIN 10                          // or SS
+#define INIT_BRIGHT 0                      // inital intensity
+
+#define DIP1 6  // Scroll DIP switch
+#define DIP2 7  // Bright DIP switch
+
+// SPI hardware interface
+MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
+
+// Text parameters
+#define CHAR_SPACING 1  // pixels between characters
+
+void Matrix_setup() {
+  mx.begin();
+  mx.setFont(fontClock);  // custom font in Font_data.h
+  delay(100);             // wait init
+  Bright_time_zone(INIT_BRIGHT);
+  Bright_date_zone(INIT_BRIGHT);
+  pinMode(DIP1, INPUT_PULLUP);
+  pinMode(DIP2, INPUT_PULLUP);
+}
+
+void Bright_date_zone(byte value) {  // set range 0..15
+  mx.control(0, MAX_DEVICES - LEFT_DEVICES - 1, MD_MAX72XX::INTENSITY, value);
+}
+
+void Bright_time_zone(byte value) {  // set range 0..15
+  mx.control(MAX_DEVICES - LEFT_DEVICES, MAX_DEVICES - 1, MD_MAX72XX::INTENSITY, value);
+}
+
+void DIP_Bright() {
+  if (digitalRead(DIP2) == LOW) {
+    Bright_time_zone(3);
+    Bright_date_zone(3);
+  } else {
+    Bright_time_zone(INIT_BRIGHT);
+    Bright_date_zone(INIT_BRIGHT);
+  }
+}
+
+bool DIP_Scroll() {
+  if (digitalRead(DIP1) == LOW) {
+    return true;
+  }
+  return false;
+}
+
+void Print_date_zone(char *my_text) {
+  char TextBuf[13];  // string buffer, max n-1 char
+  char err_char;
+  if (SyncErr) {
+    err_char = '!';  // sync warning on display
+  } else {
+    err_char = ' ';  // space
+  }
+  snprintf(TextBuf, sizeof(TextBuf), "%c%s", err_char, my_text);  // add char before text, 'between' zones
+  printText(0, MAX_DEVICES - LEFT_DEVICES - 1, TextBuf);          // right zone, from input side
+}
+
+void Print_time_zone(char *my_text) {  // assuming max 8 chars
+  DIP_Bright();
+  printText(MAX_DEVICES - LEFT_DEVICES, MAX_DEVICES - 1, my_text);  // left zone
+}
+
+void printText(uint8_t modStart, uint8_t modEnd, char *pMsg)
+/***** HowTo **********************************************
+  Simple text printing, uses minimal memory
+  Print the text chars to the LED matrix modules specified.
+  Message area is padded with blank columns after printing.
+**********************************************************/
+{
+  uint8_t state = 0;
+  uint8_t curLen;
+  uint16_t showLen;
+  uint8_t cBuf[8];
+  int16_t col = ((modEnd + 1) * COL_SIZE) - 1;
+
+  mx.control(modStart, modEnd, MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
+
+  do  // finite state machine to print the characters in the space available
+  {
+    switch (state) {
+      case 0:  // Load the next character from the font table
+        // if we reached end of message, reset the message pointer
+        if (*pMsg == '\0') {
+          showLen = col - (modEnd * COL_SIZE);  // padding characters
+          state = 2;
+          break;
+        }
+
+        // retrieve the next character form the font file
+        showLen = mx.getChar(*pMsg++, sizeof(cBuf) / sizeof(cBuf[0]), cBuf);
+        curLen = 0;
+        state++;
+        // !! deliberately fall through to next state to start displaying
+
+      case 1:  // display the next part of the character
+        mx.setColumn(col--, cBuf[curLen++]);
+
+        // done with font character, now display the space between chars
+        if (curLen == showLen) {
+          showLen = CHAR_SPACING;
+          state = 2;
+        }
+        break;
+
+      case 2:  // initialize state for displaying empty columns
+        curLen = 0;
+        state++;
+        // fall through
+
+      case 3:  // display inter-character spacing or end of message padding (blank columns)
+        mx.setColumn(col--, 0);
+        curLen++;
+        if (curLen == showLen)
+          state = 0;
+        break;
+
+      default:
+        col = -1;  // this definitely ends the do loop
+    }
+  } while (col >= (modStart * COL_SIZE));
+
+  mx.control(modStart, modEnd, MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
+}
+
+//End