main.cpp

00001 #include "mbed.h"
00002 
00003 /* Simple test for SOMO-14D module.
00004  Plays a selected file. See www.4dsystems .com.au for details.
00005  
00006  Author: Lluis Nadal.
00007  Date: October 10th 2010.
00008 
00009  File names must match file number in decimal:  0000.ad4 ... to 0511.ad4
00010  Commands:
00011     File addres (fileNumber): 0x0000 - 0x01FF
00012     Play/Pause: 0xFFFE
00013     Volume (8 levels): 0xFFF0 - 0xFFF7
00014     Stop: 0xFFFF
00015 
00016 */
00017 
00018 DigitalOut reset(p16); // connected to SOMO p10
00019 DigitalIn busy(p15);   // connected to SOMO p5
00020 
00021 // SOMO p9 connected to ground
00022 // SOMO p8 connected to Vcc = +3.3V
00023 // SOMO p11, p12 connected to speaker
00024 DigitalOut data(p5);     // connected to SOMO p4
00025 DigitalOut clk(p7);      // connected to SOMO p3
00026 unsigned short fileNumber;
00027 unsigned short command;
00028 
00029 
00030 void init() {
00031 
00032     clk = 1;
00033     reset = 1;
00034     reset = 0;
00035     wait(0.005);
00036     reset = 1;
00037     wait(0.3);
00038 }
00039 
00040 
00041 
00042 void writeData(unsigned short value) {
00043 
00044     clk = 0;
00045     wait(0.002);
00046     for (int i = 0; i<16; i++) {
00047         wait(0.000100f);
00048         data = value & 0x8000; // selects most significant bit
00049         wait(0.000001f);
00050         clk = 1;
00051         wait(0.000050f);
00052         clk=0;
00053         value = value <<1;     // shifts one bit left
00054     }
00055     clk =1;
00056     wait(0.002);
00057 }
00058 
00059 
00060 int main() {
00061     wait(0.5);
00062     while (busy == 1); // checks if SOMO is busy
00063 
00064     fileNumber = 0x0001; //selects 2nd file
00065     command = 0xFFFE;    // play file command
00066 
00067     init();
00068 
00069     writeData(fileNumber);
00070     writeData(command);
00071 
00072 }