Punkt hin und her
Dependencies: mbed
Fork of MAX7219_SPI by
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); + } + } + } +} \ No newline at end of file