7 segment displays

KeepItSimpleStupid said:

Not really.

Take a look here https://www.adafruit.com/products/453 for some other options.

LED multiplexing is a real pain.

Click to expand...

Ian Rogers said:

No! The max72xx is a driver interface.... All you do is send the address of the digit 0~7 or a control command then the data to display or the control data.... Simple

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KeepItSimpleStupid said:

Here's https://ww1.microchip.com/downloads/en/devicedoc/spi.pdf a blurb on SPI. I2C and SPI are high speed serial interfaces. Chip I2C addresses are controlled by NXP. Chips are ASSIGNED addresses by NXP.

SPI is a lot like memory chips, where each device has a chip select.

Both interfaces can be "bit-banged", but usually they are implemented on the chip and the compiler may have calls for them.

I randomly picked the mbed platform to show some SPI routines. See https://developer.mbed.org/handbook/SPI
Mbed, is a totally web-based IDE for lots of architectures.

Click to expand...

#include "mbed.h"

#define MASK (0xFF) // Pins 0,1,2,3,4,5,6,7
PortOut myIOs(PortA, MASK);
//PortOut my7Seg(PortA,MASK);

//values of the LEDs
int leds[10]={
     0b11000000,
     0b11111001,
     0b10100100,
     0b10110000,
     0b10011001,
     0b10010010,
     0b10000010,
     0b11011000,
     0b10000000,
     0b10010000
};

int main()
{
   while(1){
    for(int i=0;i<10;i++){
        // myIOs=leds[i];//0;
         //myIOs=0b01111111;
         myIOs=0b00000000;
       //my7seg=leds[i];
       //my7Seg
       wait(0.5); // 500 ms     
      }//for
    }//while
}