Diff: main.cpp

Revision:

2:675b923da5d2

Parent:

1:61f61158c345

diff -r 61f61158c345 -r 675b923da5d2 main.cpp
--- a/main.cpp	Mon Mar 28 10:11:31 2022 +0000
+++ b/main.cpp	Wed Jun 08 07:11:52 2022 +0000
@@ -7,87 +7,98 @@
 
 #include "mbed.h"
 #include "lib_matrix.h"
+#include "ascii_char.h"
 
 SPI spi(D11,D12,D13);          // Arduino compatible MOSI, MISO, SCLK
-DigitalOut cs(D14);                // Chip select
+DigitalOut cs(D14);
 
-int main()
+void MAX7219_init(char noChips)
 {
     cs = 1;                         // CS initially High
     spi.format(8,0);                // 8-bit format, mode 0,0
     spi.frequency(1000000);         // SCLK = 1 MHz
-    Init_MAX7219();                 // Initialize the LED controller
-    char tab[20]="HELLOWO&&&";
-    int i=0;
-    while (1) {
-        disp(tab[i]);
-        i=(i+1)%10;
-        wait(0.5);
-        disp(' ');
-        wait(0.1);        // 1 sec delay
+    while(noChips)
+        MAX7219_config(--noChips);
+}
+//------------------------------------------------------------------------------
+void MAX7219_config(char chip)
+{
+    MAX7219_write(DECODE_MODE_REG,DISABLE_DECODE,chip);
+    MAX7219_write(INTESITY_REG,BRIGHTNESS,chip);
+    MAX7219_write(SCAN_LIMIT_REG,SCAN_ALL_DIGITS,chip);
+    MAX7219_write(SHUTDOWN_REG,NORMAL_OPERATION,chip);
+    MAX7219_write(DISPLAY_TEST_REG,DISABLE_TEST,chip);
+}
+//------------------------------------------------------------------------------
+void MAX7219_write(char regName,char data,char chip)
+{
+    cs = 0;
+
+    spi.write(regName);
+    spi.write(data);
+    while(chip--)
+        MAX7219_NoOperation();        //Used for daisy chained (Cascaded) arrangements
+
+    cs = 1;
+}
+//------------------------------------------------------------------------------
+void MAX7219_displayText(char* text)
+{
+    char chip = 0;
+
+    while(*text) {
+        char row = (*text++) - 32;//(Text-32)...because the first 32 ASCII character codes are none Printable (control chars)
 
+        for(int col = 0; col < 8; col++) {
+            MAX7219_write( col+1, symbol[row][col], chip );
+        }
+
+        chip++;
     }
 }
+void MAX7219_displayText(char* text, char indice, char nb_chip)
+{
+    char chip = 0;
+    char * current_pointer;
+    current_pointer=text+indice;
+    while(chip<nb_chip) {
+        char row = (*current_pointer++) - 32;//(Text-32)...because the first 32 ASCII character codes are none Printable (control chars)
+        for(int col = 0; col < 8; col++) {
+            MAX7219_write( col+1, symbol[row][col], chip );
+        }
+        chip++;
+    }
+}
+void MAX7219_display(unsigned const char led[], char no_chip)
+{
+    for(int col = 0; col < 8; col++) {
+        MAX7219_write( col+1, led[col], no_chip );
+    }
+}
+//-----------Passes the data to the adjacent MAX7219 in the Daisy Chain---------
+void MAX7219_NoOperation()
+{
+    spi.write(NO_OP_REG);
+    spi.write(0x00);                //Don't care (Can be any arbitrary value)
+}
 
-void disp(char c)
+int main()
 {
-    switch(c) {
-        case 'E' :
-            for(int i=1; i<9; i++)      // Write first character (8 rows)
-                SPI_Write2(i,led_E[i-1]);
-            break;
-        case 'H' :
-            for(int i=1; i<9; i++)      // Write first character (8 rows)
-                SPI_Write2(i,led_H[i-1]);
-            break;
-        case 'L' :
-            for(int i=1; i<9; i++)      // Write first character (8 rows)
-                SPI_Write2(i,led_L[i-1]);
-            break;
-        case 'O' :
-            for(int i=1; i<9; i++)      // Write first character (8 rows)
-                SPI_Write2(i,led_O[i-1]);
-            break;
-        case 'W' :                   // 1 sec delay
-            for(int i=1; i<9; i++)      // Write second character
-                SPI_Write2(i,led_W[i-1]);
-            break;
-        case ' ' :                   // 1 sec delay
-            for(int i=1; i<9; i++)      // Write second character
-                SPI_Write2(i,led_blank[i-1]);
-            break;
-        case '&' :                   // 1 sec delay
-            for(int i=1; i<9; i++)      // Write second character
-                SPI_Write2(i,led_heart[i-1]);
-            break;
+    MAX7219_init(4);
+    while(1) {
+        MAX7219_displayText("ABCD");
+        wait(2);
+        MAX7219_displayText("HELL");
+        wait(2);
+        MAX7219_display(led_blank,0);
+        MAX7219_display(led_heart,1);
+        MAX7219_display(led_heart,2);
+        MAX7219_display(led_blank,3);
+        wait(2);
+        for(int i=0;i<7;i++){
+            MAX7219_displayText("HELLO WORLD",i,4);
+            wait(2);
+        }
     }
-}
-/// Send two bytes to SPI bus
-void SPI_Write2(unsigned char MSB, unsigned char LSB)
-{
-    cs = 0;                         // Set CS Low
-    spi.write(MSB);                 // Send two bytes
-    spi.write(LSB);
-    cs = 1;                         // Set CS High
-}
 
-/// MAX7219 initialisation
-void Init_MAX7219(void)
-{
-    SPI_Write2(0x09, 0x00);         // Decoding off
-    SPI_Write2(0x0A, 0x08);         // Brightness to intermediate
-    SPI_Write2(0x0B, 0x07);         // Scan limit = 7
-    SPI_Write2(0x0C, 0x01);         // Normal operation mode
-    SPI_Write2(0x0F, 0x0F);         // Enable display test
-    wait_ms(500);                   // 500 ms delay
-    SPI_Write2(0x01, 0x00);         // Clear row 0.
-    SPI_Write2(0x02, 0x00);         // Clear row 1.
-    SPI_Write2(0x03, 0x00);         // Clear row 2.
-    SPI_Write2(0x04, 0x00);         // Clear row 3.
-    SPI_Write2(0x05, 0x00);         // Clear row 4.
-    SPI_Write2(0x06, 0x00);         // Clear row 5.
-    SPI_Write2(0x07, 0x00);         // Clear row 6.
-    SPI_Write2(0x08, 0x00);         // Clear row 7.
-    SPI_Write2(0x0F, 0x00);         // Disable display test
-    wait_ms(500);                   // 500 ms delay
-}
+}
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