Punkt hin und her
Dependencies: mbed
Fork of MAX7219_SPI by
main.cpp
- Committer:
- yu10078999
- Date:
- 2016-09-08
- Revision:
- 0:c831ddf9569f
- Child:
- 1:545a966efb7b
File content as of revision 0:c831ddf9569f:
#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); } } } }