DAC example playing a single tone
Fork of 1620_App_Board_UART_getc by
Diff: main.cpp
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Fri Mar 03 15:10:39 2017 +0000 @@ -0,0 +1,48 @@ +/* ELEC1620 Application Board Example + +Example of using getc to receive data from the PC to control +the application board + +(c) Dr Craig A. Evans, University of Leeds, Feb 2017 + +*/ + +#include "mbed.h" +#include "ShiftReg.h" // include ShiftReg library + +ShiftReg shift; // create ShiftReg object +Serial pc(USBTX,USBRX); + +int main() +{ + // values for 0 - 9 in hex + int seven_seg_array [] = { + 0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67 + }; + + // write 0 to 7-seg to turn it off + shift.write(0x00); + + while(1) { + + // readable tells us if a character is waiting to be read + if ( pc.readable() ) { + // if one is there, then read in using getc + char c = pc.getc(); + + // check if it is a digit that has been received - note ' ' for char + if (c >= '0' && c <= '9') { + // the received char is in ASCII so convert to int by substracting + // the ASCII value of '0' + int value = c - '0'; + + // make that value appear on the 7-seg display + shift.write(seven_seg_array [value]); + + } + + } + + + } +}