Oliver Broad / Mbed 2 deprecated MAX110

Simple readout code for MAX110/111 14-bit ADC

Dependencies:   mbed

main.cpp@0:177a872748b8, 2012-07-08 (annotated)

Committer:
oliverb
Date:
Sun Jul 08 16:49:43 2012 +0000
Revision:
0:177a872748b8
Child:
1:46c26c1de51f
One MHz, binary count, readback test, comments

Who changed what in which revision?

UserRevisionLine numberNew contents of line
oliverb 0:177a872748b8 1 #include "mbed.h"
oliverb 0:177a872748b8 2 // Use SPI port to write an 8 bit pattern to MIC5821 open collector driver device.
oliverb 0:177a872748b8 3 // MBED led1 lights if pattern read back from MIC5821 matches pattern written
oliverb 0:177a872748b8 4 // Ordinarily the device would be write-only but loopback may be usefull in testing.
oliverb 0:177a872748b8 5 // Cascade output is NOT tristate. Strobe is NOT a CS/SS signal, needs a pulse.
oliverb 0:177a872748b8 6 //
oliverb 0:177a872748b8 7 // Note that the MIC has a speed limit, 3.3MHz at 5v, mine works OK at 1MHz at 3.3v
oliverb 0:177a872748b8 8 // Also input has CMOS thresholds so it may not recognise MBED logic HI when powered
oliverb 0:177a872748b8 9 // from 5v so power it from Vout.
oliverb 0:177a872748b8 10 //
oliverb 0:177a872748b8 11 // Data is clocked in on rising edges so SPI 0,0 or SPI 1,1.
oliverb 0:177a872748b8 12
oliverb 0:177a872748b8 13 SPI spi(p5, p6, p7); // mosi, miso, sclk
oliverb 0:177a872748b8 14
oliverb 0:177a872748b8 15 DigitalOut strobe(p21);
oliverb 0:177a872748b8 16 DigitalOut led(LED1);
oliverb 0:177a872748b8 17
oliverb 0:177a872748b8 18 int main() {
oliverb 0:177a872748b8 19 spi.format(8,0);
oliverb 0:177a872748b8 20 spi.frequency(1000000);
oliverb 0:177a872748b8 21 char leds,prev;
oliverb 0:177a872748b8 22 leds=0;
oliverb 0:177a872748b8 23 while(1) {
oliverb 0:177a872748b8 24 prev=spi.write(leds)+1;
oliverb 0:177a872748b8 25 led=(prev == leds);
oliverb 0:177a872748b8 26 leds++;
oliverb 0:177a872748b8 27 strobe=1;
oliverb 0:177a872748b8 28 wait_us(1);
oliverb 0:177a872748b8 29 strobe=0;
oliverb 0:177a872748b8 30 wait(0.5);
oliverb 0:177a872748b8 31 }
oliverb 0:177a872748b8 32 }