Diff: main.cpp

Revision:

0:c831ddf9569f

Child:

1:545a966efb7b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 08 07:59:21 2016 +0000
@@ -0,0 +1,114 @@
+#include "mbed.h"
+
+// PC_3: DIN, PB_10: CLK, D2: LOAD/CS
+SPI max72_spi(PC_3, NC, PB_10);
+DigitalOut load(D2);
+
+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
+
+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
+}
+
+
+     /*maxSingle(1,1);                     //  - - - - - - - +
+     maxSingle(2,2);                       //  - - - - - - + -
+     maxSingle(3,4);                       //  - - - - - + - -
+     maxSingle(4,8);                       //  - - - - + - - -
+     maxSingle(5,8);                       //  - - - + - - - -
+     maxSingle(6,8);                       //  - - + - - - - -
+     maxSingle(7,8);                       //  - + - - - - - -
+     maxSingle(8,8);                       //  + - - - - - - -
+    wait_ms(2000);*/
+int main() {
+    setup ();
+    while(1){
+            for(int i=1;i<=8;i++){
+            for(int j=1;j<=128;j*=2){
+            maxSingle(i,j);
+            wait(0.1);
+            }
+            }
+            for(int i=8;i>=1;i--){
+            for(int j=128;j>=1;j*=0.5){
+            maxSingle(i,j);
+            wait(0.1);
+            }
+            }
+    }
+}
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