Revision 0:58230626a482, committed 2016-05-16

Comitter:

takeuchi

Date:

Mon May 16 08:54:42 2016 +0000

Commit message:

MT7219

Changed in this revision

diff -r 000000000000 -r 58230626a482 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 16 08:54:42 2016 +0000
@@ -0,0 +1,143 @@
+// LedMatrix  1mai 
+
+#include "mbed.h"
+ 
+DigitalOut led(dp28);
+
+// spi(mosi,miso,sck)
+SPI max72_spi(dp2, NC, dp6);
+DigitalOut load(dp14);//spi load
+
+// CPU       MT7219
+// dp1 mosi(Master In Salve Out) =>   DIN
+// dp2 miso(Master OutSlave)   =>   nc
+// dp6 sck (Serial Clock) =>   clk
+// dp14 =>(Slave Select) load
+
+ 
+int maxInUse = 1;    //change this variable to set how many MAX7219's you'll use
+ 
+// define max7219 registers
+#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
+#define max7219_reg_decodeMode   0x09
+#define max7219_reg_intensity    0x0a
+#define max7219_reg_scanLimit    0x0b
+#define max7219_reg_shutdown     0x0c
+#define max7219_reg_displayTest  0x0f
+ 
+#define LOW 0
+#define HIGH 1
+#define MHZ 1000000
+#define ON 1
+#define OFF 0
+
+void maxSingle( int reg, int col) {
+//maxSingle is the "easy"  function to use for a
+//single max7219
+    load = LOW;            // begin
+    max72_spi.write(reg);  // specify register
+    max72_spi.write(col);  // put data
+    load = HIGH;           // make sure data is loaded (on rising edge of LOAD/CS)
+}
+ 
+void maxAll (int reg, int col) {    // initialize  all  MAX7219's in the system
+    load = LOW;                    // begin
+    for ( int c=1; c<= maxInUse; c++) {
+        max72_spi.write(reg);  // specify register
+        max72_spi.write(col);  // put data
+    }
+    load = HIGH;
+}
+ 
+void maxOne(int maxNr, int reg, int col) {
+//maxOne is for adressing different MAX7219's,
+//while having a couple of them cascaded
+    int c = 0;
+    load = LOW;
+ 
+    for ( c = maxInUse; c >= maxNr; c--) {
+        max72_spi.write(0);  // no-op
+        max72_spi.write(0);  // no-op
+    }
+ 
+    max72_spi.write(reg);  // specify register
+    max72_spi.write(col);  // put data
+ 
+    for ( c=maxNr-1; c >= 1; c--) {
+        max72_spi.write(0);  // no-op
+        max72_spi.write(0);  // no-op
+    }
+    load = HIGH;
+}
+  
+void setup () {
+    // initiation of the max 7219
+    // SPI setup: 8 bits, mode 0
+    max72_spi.format(8, 0);
+    
+    // going by the datasheet, min clk is 100ns so theoretically 10MHz should work...
+    // max72_spi.frequency(10*MHZ);
+    
+    maxAll(max7219_reg_scanLimit, 0x07);
+    maxAll(max7219_reg_decodeMode, 0x00);  // using an led matrix (not digits)
+    maxAll(max7219_reg_shutdown, 0x01);    // not in shutdown mode
+    maxAll(max7219_reg_displayTest, 0x00); // no display test
+    for (int e=1; e<=8; e++) {    // empty registers, turn all LEDs off
+        maxAll(e,0);
+    }
+    maxAll(max7219_reg_intensity, 0x0f & 0x0f);    // the first 0x0f is the value you can set
+    // range: 0x00 to 0x0f
+} 
+
+void led_flash(){
+    int i;
+    for(i=0;i<3;i++){
+        led=ON;
+        wait(0.1);
+        led=OFF;
+        wait(0.1);
+    }
+}
+ 
+ 
+int main(void) {
+
+    led_flash();
+    setup();
+
+    while(1){
+        
+        led=ON;
+        maxSingle(1,1);       //                 |-| -------+
+        maxSingle(2,2);       //                 |-| ------+-
+        maxSingle(3,4);       //                 |-| -----+--
+        maxSingle(4,8);       //                 |-| ----+---
+        maxSingle(5,16);      //                 |-| ---+----
+        maxSingle(6,32);      //                 |-| --+-----
+        maxSingle(7,64);      //                 |-| -+------
+        maxSingle(8,128);     //                 |-| +-------
+        wait(0.1);
+ 
+        led=OFF;
+        maxSingle(1,0);                       
+        maxSingle(2,0);       
+        maxSingle(3,0);       
+        maxSingle(4,0);       
+        maxSingle(5,0);      
+        maxSingle(6,0);      
+        maxSingle(7,0);      
+        maxSingle(8,0);     
+        wait(0.1);
+        
+    }//while
+}//main
+
+

diff -r 000000000000 -r 58230626a482 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon May 16 08:54:42 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/031413cf7a89
\ No newline at end of file