Lucy Lenhardt / Mbed 2 deprecated 4180_FDP_ADC

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Dependencies:   SDFileSystem_high_spi_freq mbed wave_player_pwm_and_dac

main.cpp@0:205c27289cf4, 2014-12-05 (annotated)

Committer:
lenhardt
Date:
Fri Dec 05 02:34:45 2014 +0000
Revision:
0:205c27289cf4
This is Wheel Beats working with ADC, playing through PWMout for a ; headphone/speaker audio jack when you hit the force sensitive resistor squares. Oh, and it reads it off an SD card at an spi frequency of 25MHz.

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UserRevisionLine numberNew contents of line
lenhardt 0:205c27289cf4 1 #include "mbed.h"
lenhardt 0:205c27289cf4 2 #include "SDFileSystem.h"
lenhardt 0:205c27289cf4 3 #include "wave_player.h"
lenhardt 0:205c27289cf4 4
lenhardt 0:205c27289cf4 5 SPI spi(p11, p12, p13); // mosi(out), miso(in), sclk(clock)
lenhardt 0:205c27289cf4 6 DigitalOut cs(p14); // cs (the chip select signal)
lenhardt 0:205c27289cf4 7 Serial pc(USBTX, USBRX); // tx, rx ( the usb serial communication )
lenhardt 0:205c27289cf4 8
lenhardt 0:205c27289cf4 9 SDFileSystem sd(p5, p6, p7, p8, "sd");
lenhardt 0:205c27289cf4 10 PwmOut PWMout(p21);
lenhardt 0:205c27289cf4 11 AnalogOut DACout(p18);
lenhardt 0:205c27289cf4 12 AnalogIn fsr(p15);
lenhardt 0:205c27289cf4 13 wave_player waver(&DACout,&PWMout);
lenhardt 0:205c27289cf4 14 FILE *wave_file;
lenhardt 0:205c27289cf4 15
lenhardt 0:205c27289cf4 16 int main() {
lenhardt 0:205c27289cf4 17 // Setup the spi for 7 bit data, high steady state clock,
lenhardt 0:205c27289cf4 18 // second edge capture, with a 1MHz clock rate
lenhardt 0:205c27289cf4 19 spi.format(7,0);
lenhardt 0:205c27289cf4 20 spi.frequency(1000000);
lenhardt 0:205c27289cf4 21
lenhardt 0:205c27289cf4 22 // Set PWMout period
lenhardt 0:205c27289cf4 23 PWMout.period(1.0/400000.0);
lenhardt 0:205c27289cf4 24
lenhardt 0:205c27289cf4 25 // notify the user that we are starting with the ADC communication
lenhardt 0:205c27289cf4 26 pc.printf("Starting ADC interaction\n\n\n");
lenhardt 0:205c27289cf4 27
lenhardt 0:205c27289cf4 28 // lets just do this forever
lenhardt 0:205c27289cf4 29 while (1) {
lenhardt 0:205c27289cf4 30
lenhardt 0:205c27289cf4 31 for (int i = 0 ; i < 2; i++){
lenhardt 0:205c27289cf4 32 // Select the device by seting chip select low
lenhardt 0:205c27289cf4 33 cs = 0;
lenhardt 0:205c27289cf4 34
lenhardt 0:205c27289cf4 35 // sending the 6 bits + 1 bit to ignore the null bit
lenhardt 0:205c27289cf4 36 // coming from the device, so the data that is sent is 1100000
lenhardt 0:205c27289cf4 37 spi.write(0x60 + (i*4));
lenhardt 0:205c27289cf4 38
lenhardt 0:205c27289cf4 39 // now the device sends back the readings 12 bits, 7 bits at a time
lenhardt 0:205c27289cf4 40 uint8_t high = spi.write(0x00);
lenhardt 0:205c27289cf4 41 uint8_t low = spi.write(0x00);
lenhardt 0:205c27289cf4 42
lenhardt 0:205c27289cf4 43 // shift out the right bits
lenhardt 0:205c27289cf4 44 low = ( high << 5 ) | (low >> 2);
lenhardt 0:205c27289cf4 45 high = high >> 3;
lenhardt 0:205c27289cf4 46
lenhardt 0:205c27289cf4 47 // shift and or the result together
lenhardt 0:205c27289cf4 48 int value = ( high << 8 ) | low;
lenhardt 0:205c27289cf4 49
lenhardt 0:205c27289cf4 50 // and voila we have the value and we can print it for the user
lenhardt 0:205c27289cf4 51 //pc.printf("sensor %d value = %u\n", i, value);
lenhardt 0:205c27289cf4 52 switch (i){
lenhardt 0:205c27289cf4 53 case 0:
lenhardt 0:205c27289cf4 54 if (value > 200) {
lenhardt 0:205c27289cf4 55 pc.printf("\tX\r");
lenhardt 0:205c27289cf4 56 wave_file=fopen("/sd/highhat.wav","r");
lenhardt 0:205c27289cf4 57 waver.play(wave_file);
lenhardt 0:205c27289cf4 58 fclose(wave_file);
lenhardt 0:205c27289cf4 59 }
lenhardt 0:205c27289cf4 60 break;
lenhardt 0:205c27289cf4 61 case 1:
lenhardt 0:205c27289cf4 62 if (value > 200){
lenhardt 0:205c27289cf4 63 pc.printf("\t\t\t\tX\r");
lenhardt 0:205c27289cf4 64 wave_file=fopen("/sd/snare.wav","r");
lenhardt 0:205c27289cf4 65 waver.play(wave_file);
lenhardt 0:205c27289cf4 66 fclose(wave_file);
lenhardt 0:205c27289cf4 67 }
lenhardt 0:205c27289cf4 68 break;
lenhardt 0:205c27289cf4 69 }
lenhardt 0:205c27289cf4 70
lenhardt 0:205c27289cf4 71 // Deselect the device
lenhardt 0:205c27289cf4 72 cs = 1;
lenhardt 0:205c27289cf4 73 }
lenhardt 0:205c27289cf4 74
lenhardt 0:205c27289cf4 75 // delay some time before reading again
lenhardt 0:205c27289cf4 76 wait_us(100);
lenhardt 0:205c27289cf4 77 }
lenhardt 0:205c27289cf4 78 }