Revision 0:2c4e3799881a, committed 2018-08-03

Comitter:

kulwantt

Date:

Fri Aug 03 06:43:16 2018 +0000

Commit message:

Interfacing LED dotmatrix with W7500 using Max7219 chip.; The documentation for Max7219 is provided in the below link: -; https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max7219.cpp	Fri Aug 03 06:43:16 2018 +0000
@@ -0,0 +1,334 @@
+#include "max7219.h"
+
+DigitalOut cs(D8);
+
+SPI spi(PA_08, NC, PA_06);
+
+char max[]={0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08};
+
+char temp[100];
+char ch[]={
+    0x1c,0x22,0x22,0x32,0x2a,0x26,0x22,0x1c,        //0
+    0x3e,0x08,0x08,0x08,0x08,0x0a,0x0c,0x08, //1
+    0x3e,0x02,0x04,0x08,0x10,0x20,0x22,0x1c, //2
+    0x1e,0x20,0x20,0x1c,0x1c,0x20,0x20,0x1e, //3
+    0x20,0x20,0x20,0x3e,0x22,0x24,0x28,0x30,//4
+    0x1c,0x22,0x20,0x20,0x1e,0x02,0x02,0x3e,//5
+    0x1c,0x22,0x22,0x1e,0x02,0x02,0x22,0x1c,//6
+    0x04,0x04,0x08,0x08,0x10,0x10,0x20,0x3e,//7
+    0x1c,0x22,0x22,0x3e,0x3e,0x22,0x22,0x1c,//8
+    0x1c,0x22,0x20,0x20,0x3c,0x22,0x22,0x1c,//9
+    
+    
+      //Symbol needs to be defined  
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     
+  
+    0x24,0x24,0x24,0x3c,0x3c,0x24,0x24,0x18,//A
+    0x1e,0x22,0x22,0x1e,0x1e,0x22,0x22,0x1e,//B
+    0x3c,0x02,0x02,0x02,0x02,0x02,0x02,0x3c,//C
+    0x1e,0x22,0x22,0x22,0x22,0x22,0x22,0x1e,//D
+    0x3e,0x02,0x02,0x3e,0x3e,0x02,0x02,0x3e,//E
+    0x02,0x02,0x02,0x3e,0x3e,0x02,0x02,0x3e,//F
+    0x2c,0x2a,0x2a,0x3a,0x02,0x02,0x22,0x1c,//G
+    0x22,0x22,0x22,0x3e,0x3e,0x22,0x22,0x22,//H
+    0x3e,0x08,0x08,0x08,0x08,0x08,0x08,0x3e,//I
+    0x1c,0x12,0x10,0x10,0x10,0x10,0x10,0x7c,//J
+    0x22,0x12,0x0a,0x06,0x06,0x0a,0x12,0x22,//K
+    0x3e,0x02,0x02,0x02,0x02,0x02,0x02,0x02,//L
+    0x42,0x42,0x42,0x42,0x5a,0x5a,0x66,0x42,//M
+    0x42,0x62,0x72,0x5a,0x4e,0x46,0x42,0x42,//N
+    0x1c,0x22,0x22,0x22,0x22,0x22,0x22,0x1c,//O
+    0x02,0x02,0x02,0x1e,0x22,0x22,0x22,0x1e,//P
+    0x7c,0x32,0x2e,0x22,0x22,0x22,0x22,0x1c,//Q
+    0x22,0x12,0x0a,0x06,0x1e,0x22,0x22,0x1e,//R
+    0x1c,0x22,0x30,0x18,0x0c,0x06,0x22,0x1c,//S
+    0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x3e,//T
+    0x1c,0x22,0x22,0x22,0x22,0x22,0x22,0x22,//U
+    0x08,0x1c,0x36,0x22,0x22,0x22,0x22,0x22,//V
+    0x36,0x2a,0x2a,0x2a,0x22,0x22,0x22,0x22,//W
+    0x42,0x42,0x24,0x18,0x18,0x24,0x42,0x42,//X
+    0x08,0x08,0x08,0x08,0x1c,0x22,0x22,0x22,//Y
+    0x7e,0x02,0x04,0x08,0x10,0x20,0x40,0x7e,//Z
+     
+       //Symbol needs to be defined  
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+     
+     0x38,0x24,0x24,0x38,0x20,0x1c,0x00,0x00,//a
+     0x1e,0x22,0x22,0x1e,0x02,0x02,0x02,0x00,//b
+     0x1c,0x02,0x02,0x02,0x02,0x1c,0x00,0x00,//c
+     0x3c,0x22,0x22,0x3c,0x20,0x20,0x20,0x00,//d
+     0x1c,0x22,0x02,0x1e,0x22,0x1c,0x00,0x00,//e
+     0x04,0x04,0x04,0x0e,0x04,0x14,0x0c,0x00,//f
+     0x1c,0x12,0x10,0x1c,0x12,0x12,0x1c,0x00,//g
+     0x12,0x12,0x12,0x1e,0x02,0x02,0x02,0x00,//h
+     0x18,0x08,0x08,0x08,0x08,0x00,0x08,0x00,//i
+     0x18,0x08,0x08,0x08,0x08,0x00,0x08,0x00,//j
+     0x12,0x0a,0x06,0x0a,0x12,0x02,0x02,0x00,//k
+     0x1c,0x04,0x04,0x04,0x04,0x04,0x04,0x00,//l
+     0x2a,0x2a,0x2a,0x2a,0x36,0x00,0x00,0x00,//m
+     0x22,0x22,0x22,0x26,0x1a,0x00,0x00,0x00,//n
+     0x1c,0x22,0x22,0x22,0x1c,0x00,0x00,0x00,//o
+     0x02,0x02,0x0e,0x12,0x12,0x0e,0x02,0x00,//p
+     0x10,0x30,0x50,0x1c,0x12,0x12,0x1c,0x00,//q
+     0x02,0x02,0x02,0x22,0x26,0x1a,0x00,0x00,//r
+     0x18,0x24,0x10,0x08,0x24,0x18,0x00,0x00,//s
+     0x08,0x14,0x04,0x04,0x1e,0x04,0x04,0x00,//t
+     0x1c,0x22,0x22,0x22,0x22,0x00,0x00,0x00,//u
+     0x08,0x14,0x22,0x22,0x22,0x00,0x00,0x00,//v
+     0x14,0x2a,0x2a,0x2a,0x2a,0x00,0x00,0x00,//w
+     0x22,0x14,0x08,0x14,0x22,0x00,0x00,0x00,//x
+     0x18,0x24,0x20,0x38,0x24,0x24,0x00,0x00,//y
+     0x3e,0x04,0x08,0x10,0x3e,0x00,0x00,0x00,//z
+    };
+
+max7219::max7219()
+{
+    
+    }
+    
+max7219::~max7219()
+{
+        
+        
+ }
+ 
+ 
+ void max7219::init()
+ {
+
+       spi.format(8,3);
+    
+    spi.frequency(1000000);
+       
+    //  max7219_reg_scanLimit
+    cs=0;
+    spi.write(0x0B);
+    spi.write(0x07);
+    cs=1;
+   
+    // max7219_reg_decodeMode
+    cs=0;
+    spi.write(0x09);
+    spi.write(0x00);
+    cs=1;
+    
+    
+    
+    // Disable shutdown mode
+    cs=0;
+    spi.write(0x0C);
+    spi.write(0x01);
+    cs=1;
+    
+    //display test 
+    cs=0;
+    spi.write(0x0F);
+    spi.write(0x01);  
+    cs=1;
+    wait(1);
+    
+    // normal operation  
+    cs=0;
+    spi.write(0x0F);
+    spi.write(0x00);
+    cs=1;
+    
+    cs=0;
+    spi.write(0x0A);
+    spi.write(0x0F); 
+    cs=1;
+  
+  // To blank all the devices
+    for(int i=0;i<8; i++)
+        {
+         cs=0;
+         spi.write(max[i]);
+         spi.write(0x00);
+          cs=1;
+          }
+          
+}
+ 
+void max7219::send(char* read)
+{
+    
+    
+    
+    int k=0,j,c;
+     while(read[k]!='\0')
+{
+    k++;
+    
+    
+}     
+switch(k){
+    
+    
+    case 0:   for(int i=0;i<8; i++)
+        {
+         cs=0;
+         spi.write(max[i]);
+         spi.write(0x00);
+          cs=1;
+          }
+          break;
+          
+    case 1: 
+    for (j=0;j<k;j++){
+
+    for(int i=0;i<8;i++)
+    {
+        cs=0;
+        spi.write(max[i]);
+        spi.write(ch[((read[j]-48)*8)+i]);
+        
+        for (c=j;c>0;c--)
+        {
+            spi.write(0x00);
+            spi.write(0x00);
+            }
+        cs=1;
+
+        }
+}
+for(int y=3;y>0;y--){
+for(int i=0;i<8;i++)
+{   cs=0;
+    spi.write(max[i]);
+    spi.write(0x00);
+    for (int l=y;l>0;l--)
+    {
+        spi.write(0x00);
+        spi.write(0x00);
+        }
+    cs=1;
+    
+    }}
+break;
+
+case 2:
+for (j=0;j<k;j++){
+
+    for(int i=0;i<8;i++)
+    {
+        cs=0;
+        spi.write(max[i]);
+        spi.write(ch[((read[j]-48)*8)+i]);
+        
+        for (c=j;c>0;c--)
+        {
+            spi.write(0x00);
+            spi.write(0x00);
+            }
+        cs=1;
+
+        }
+}
+for(int y=3;y>1;y--){
+for(int i=0;i<8;i++)
+{
+    cs=0;
+    spi.write(max[i]);
+    spi.write(0x00);
+    for (int l=y;l>0;l--)
+    {
+        spi.write(0x00);
+        spi.write(0x00);
+        }
+    
+    cs=1;
+    }}
+break;
+
+case 3:
+for (j=0;j<k;j++){
+    for(int i=0;i<8;i++)
+    {
+        cs=0;
+        spi.write(max[i]);
+        spi.write(ch[((read[j]-48)*8)+i]);
+        
+        for (c=j;c>0;c--)
+        {
+            spi.write(0x00);
+            spi.write(0x00);
+            }
+        cs=1;
+
+        }
+}
+for(int i=0;i<8;i++)
+{
+    cs=0;
+    spi.write(max[i]);
+    spi.write(0x00);
+    for (int l=3;l>0;l--)
+    {
+        spi.write(0x00);
+        spi.write(0x00);
+        }
+    cs=1;
+    
+    }
+break;
+
+
+    case 4:
+for (j=0;j<k;j++){
+
+    for(int i=0;i<8;i++)
+    {
+        cs=0;
+        spi.write(max[i]);
+        spi.write(ch[((read[j]-48)*8)+i]);
+        
+        for (c=j;c>0;c--)
+        {
+            spi.write(0x00);
+            spi.write(0x00);
+            }
+        cs=1;
+
+        }
+}
+break;
+}
+}
+
+
+void max7219::sendstring(char* read)
+{
+ int j=0,o=0;
+ for(int i=0;i<32;i++)
+{
+    
+    cs=0;
+    spi.write(max[j]);
+    spi.write(read[i]);
+    for(int m=o;m>0;m--)
+        {
+        spi.write(0x00);
+        spi.write(0x00);
+        }
+    cs=1;
+ j++;   
+if(j>7)
+{
+    j=0;
+    o++;
+    }
+    
+}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max7219.h	Fri Aug 03 06:43:16 2018 +0000
@@ -0,0 +1,87 @@
+/*
+* This library is tested with Wiznet W7500 and Max7219 Chip to interface the LED Dot Matrix
+* We tested with 4 cascaded Max7219 chip.
+* The connections are as follow:
+
+        W7500            Max7219
+            
+         MOSI (PA_08)   -> Din
+         MISO           -> NC
+         SCK  (PA_06)   -> CLK
+         D8(Digital Pin)-> CS
+         Vcc            -> Vcc
+         Gnd            -> Gnd
+            
+
+*To send any string greater than 4 words, it has to be declared in the scope (ex given below- char Hello[])
+*The link given below helps in creating the particular word/string the user wants to display.
+* link - https://xantorohara.github.io/led-matrix-editor/#a2a2a2bea2a2a2a2|df40405f5f40405f|f710101010101010|7984848484848478
+
+*/
+
+
+/* Example program
+*#include "max7219.h"
+*max7219 m; 
+
+//Defining hex code for "HELLO"
+*char Hello[]={0xa2,0xa2,0xa2,0xbe,0xa2,0xa2,0xa2,0xa2,
+*           0xdf,0x40,0x40,0x5f,0x5f,0x40,0x40,0x5f,
+*            0xf7,0x10,0x10,0x10,0x10,0x10,0x10,0x10,
+*            0x79,0x84,0x84,0x84,0x84,0x84,0x84,0x78};      
+*int main() {
+*    m.init();
+*    while(1){
+      //To send 4 or less letters or digits, use the send fuction 
+*       m.send("123"); 
+*       wait(0.5); //Delay
+
+*        m.send("AbCd");
+*        wait(0.5);
+
+        //To send any word/string use the send string function
+*        m.sendstring(Hello);
+*        wait(0.5);
+
+*            }
+*}
+
+*/
+#ifndef MAX7219_H
+#define MAX7219_H
+
+#include "mbed.h"
+
+#define max7219_reg_noop         0x00
+#define max7219_reg_digit0       0x01
+#define max7219_reg_digit1       0x02
+#define max7219_reg_digit2       0x03
+#define max7219_reg_digit3       0x04
+#define max7219_reg_digit4       0x05
+#define max7219_reg_digit5       0x06
+#define max7219_reg_digit6       0x07
+#define max7219_reg_digit7       0x08
+
+
+
+class max7219
+{
+public: 
+
+max7219(); // PA_08, NC, PA_06, digital_pin
+
+~max7219();    
+void init();
+
+void send(char*); 
+
+void sendstring(char*);
+
+private:
+PinName mosi;
+PinName miso;
+PinName sclk;
+PinName load;   
+};
+
+#endif
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Aug 03 06:43:16 2018 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/a7c7b631e539
\ No newline at end of file