Revision 0:558646c716d0, committed 2011-09-03

Comitter:

halfpitch

Date:

Sat Sep 03 17:06:30 2011 +0000

Commit message:

Rev.A

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FATFileSystem.lib	Sat Sep 03 17:06:30 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_unsupported/code/fatfilesystem/
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDFileSystem.cpp	Sat Sep 03 17:06:30 2011 +0000
@@ -0,0 +1,441 @@
+/* mbed Microcontroller Library - SDFileSystem
+ * Copyright (c) 2008-2009, sford
+ */
+ 
+// VERY DRAFT CODE! Needs serious rework/refactoring 
+ 
+/* Introduction
+ * ------------
+ * SD and MMC cards support a number of interfaces, but common to them all
+ * is one based on SPI. This is the one I'm implmenting because it means
+ * it is much more portable even though not so performant, and we already 
+ * have the mbed SPI Interface!
+ *
+ * The main reference I'm using is Chapter 7, "SPI Mode" of: 
+ *  http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
+ *
+ * SPI Startup
+ * -----------
+ * The SD card powers up in SD mode. The SPI interface mode is selected by
+ * asserting CS low and sending the reset command (CMD0). The card will 
+ * respond with a (R1) response.
+ *
+ * CMD8 is optionally sent to determine the voltage range supported, and 
+ * indirectly determine whether it is a version 1.x SD/non-SD card or 
+ * version 2.x. I'll just ignore this for now.
+ *
+ * ACMD41 is repeatedly issued to initialise the card, until "in idle"
+ * (bit 0) of the R1 response goes to '0', indicating it is initialised.
+ *
+ * You should also indicate whether the host supports High Capicity cards,
+ * and check whether the card is high capacity - i'll also ignore this
+ *
+ * SPI Protocol
+ * ------------
+ * The SD SPI protocol is based on transactions made up of 8-bit words, with
+ * the host starting every bus transaction by asserting the CS signal low. The
+ * card always responds to commands, data blocks and errors.
+ * 
+ * The protocol supports a CRC, but by default it is off (except for the 
+ * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
+ * I'll leave the CRC off I think! 
+ * 
+ * Standard capacity cards have variable data block sizes, whereas High 
+ * Capacity cards fix the size of data block to 512 bytes. I'll therefore
+ * just always use the Standard Capacity cards with a block size of 512 bytes.
+ * This is set with CMD16.
+ *
+ * You can read and write single blocks (CMD17, CMD25) or multiple blocks 
+ * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
+ * the card gets a read command, it responds with a response token, and then 
+ * a data token or an error.
+ * 
+ * SPI Command Format
+ * ------------------
+ * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
+ *
+ * +---------------+------------+------------+-----------+----------+--------------+
+ * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
+ * +---------------+------------+------------+-----------+----------+--------------+
+ *
+ * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
+ *
+ * All Application Specific commands shall be preceded with APP_CMD (CMD55).
+ *
+ * SPI Response Format
+ * -------------------
+ * The main response format (R1) is a status byte (normally zero). Key flags:
+ *  idle - 1 if the card is in an idle state/initialising 
+ *  cmd  - 1 if an illegal command code was detected
+ *
+ *    +-------------------------------------------------+
+ * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
+ *    +-------------------------------------------------+
+ *
+ * R1b is the same, except it is followed by a busy signal (zeros) until
+ * the first non-zero byte when it is ready again.
+ *
+ * Data Response Token
+ * -------------------
+ * Every data block written to the card is acknowledged by a byte 
+ * response token
+ *
+ * +----------------------+
+ * | xxx | 0 | status | 1 |
+ * +----------------------+
+ *              010 - OK!
+ *              101 - CRC Error
+ *              110 - Write Error
+ *
+ * Single Block Read and Write
+ * ---------------------------
+ *
+ * Block transfers have a byte header, followed by the data, followed
+ * by a 16-bit CRC. In our case, the data will always be 512 bytes.
+ *  
+ * +------+---------+---------+- -  - -+---------+-----------+----------+
+ * | 0xFE | data[0] | data[1] |        | data[n] | crc[15:8] | crc[7:0] | 
+ * +------+---------+---------+- -  - -+---------+-----------+----------+
+ */
+ 
+#include "SDFileSystem.h"
+
+#define SD_COMMAND_TIMEOUT 5000
+
+SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
+  FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
+      _cs = 1; 
+}
+
+#define R1_IDLE_STATE           (1 << 0)
+#define R1_ERASE_RESET          (1 << 1)
+#define R1_ILLEGAL_COMMAND      (1 << 2)
+#define R1_COM_CRC_ERROR        (1 << 3)
+#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
+#define R1_ADDRESS_ERROR        (1 << 5)
+#define R1_PARAMETER_ERROR      (1 << 6)
+
+// Types
+//  - v1.x Standard Capacity
+//  - v2.x Standard Capacity
+//  - v2.x High Capacity
+//  - Not recognised as an SD Card
+
+#define SDCARD_FAIL 0
+#define SDCARD_V1   1
+#define SDCARD_V2   2
+#define SDCARD_V2HC 3
+
+int SDFileSystem::initialise_card() {
+    // Set to 100kHz for initialisation, and clock card with cs = 1
+    _spi.frequency(100000); 
+    _cs = 1;
+    for(int i=0; i<16; i++) {   
+        _spi.write(0xFF);
+    }
+
+    // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
+    if(_cmd(0, 0) != R1_IDLE_STATE) { 
+        fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
+        return SDCARD_FAIL;
+    }
+
+    // send CMD8 to determine whther it is ver 2.x
+    int r = _cmd8();
+    if(r == R1_IDLE_STATE) {
+        return initialise_card_v2();
+    } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
+        return initialise_card_v1();
+    } else {
+        fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
+        return SDCARD_FAIL;
+    }
+}
+
+int SDFileSystem::initialise_card_v1() {
+    for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+        _cmd(55, 0); 
+        if(_cmd(41, 0) == 0) { 
+            return SDCARD_V1;
+        }
+    }
+
+    fprintf(stderr, "Timeout waiting for v1.x card\n");
+    return SDCARD_FAIL;
+}
+
+int SDFileSystem::initialise_card_v2() {
+    
+    for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+        _cmd(55, 0); 
+        if(_cmd(41, 0) == 0) { 
+            _cmd58();
+            return SDCARD_V2;
+        }
+    }
+
+    fprintf(stderr, "Timeout waiting for v2.x card\n");
+    return SDCARD_FAIL;
+}
+
+int SDFileSystem::disk_initialize() {
+
+    int i = initialise_card();
+//    printf("init card = %d\n", i);
+//    printf("OK\n");
+
+    _sectors = _sd_sectors();
+
+    // Set block length to 512 (CMD16)
+    if(_cmd(16, 512) != 0) {
+        fprintf(stderr, "Set 512-byte block timed out\n");
+        return 1;
+    }
+        
+    _spi.frequency(1000000); // Set to 1MHz for data transfer
+    return 0;
+}
+
+int SDFileSystem::disk_write(const char *buffer, int block_number) {
+    // set write address for single block (CMD24)
+    if(_cmd(24, block_number * 512) != 0) {
+        return 1;
+    }
+
+    // send the data block
+    _write(buffer, 512);    
+    return 0;    
+}
+
+int SDFileSystem::disk_read(char *buffer, int block_number) {        
+    // set read address for single block (CMD17)
+    if(_cmd(17, block_number * 512) != 0) {
+        return 1;
+    }
+    
+    // receive the data
+    _read(buffer, 512);
+    return 0;
+}
+
+int SDFileSystem::disk_status() { return 0; }
+int SDFileSystem::disk_sync() { return 0; }
+int SDFileSystem::disk_sectors() { return _sectors; }
+
+// PRIVATE FUNCTIONS
+
+int SDFileSystem::_cmd(int cmd, int arg) {
+    _cs = 0; 
+
+    // send a command
+    _spi.write(0x40 | cmd);
+    _spi.write(arg >> 24);
+    _spi.write(arg >> 16);
+    _spi.write(arg >> 8);
+    _spi.write(arg >> 0);
+    _spi.write(0x95);
+
+    // wait for the repsonse (response[7] == 0)
+    for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+        int response = _spi.write(0xFF);
+        if(!(response & 0x80)) {
+            _cs = 1;
+            _spi.write(0xFF);
+            return response;
+        }
+    }
+    _cs = 1;
+    _spi.write(0xFF);
+    return -1; // timeout
+}
+int SDFileSystem::_cmdx(int cmd, int arg) {
+    _cs = 0; 
+
+    // send a command
+    _spi.write(0x40 | cmd);
+    _spi.write(arg >> 24);
+    _spi.write(arg >> 16);
+    _spi.write(arg >> 8);
+    _spi.write(arg >> 0);
+    _spi.write(0x95);
+
+    // wait for the repsonse (response[7] == 0)
+    for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+        int response = _spi.write(0xFF);
+        if(!(response & 0x80)) {
+            return response;
+        }
+    }
+    _cs = 1;
+    _spi.write(0xFF);
+    return -1; // timeout
+}
+
+
+int SDFileSystem::_cmd58() {
+    _cs = 0; 
+    int arg = 0;
+    
+    // send a command
+    _spi.write(0x40 | 58);
+    _spi.write(arg >> 24);
+    _spi.write(arg >> 16);
+    _spi.write(arg >> 8);
+    _spi.write(arg >> 0);
+    _spi.write(0x95);
+
+    // wait for the repsonse (response[7] == 0)
+    for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+        int response = _spi.write(0xFF);
+        if(!(response & 0x80)) {
+            int ocr = _spi.write(0xFF) << 24;
+            ocr |= _spi.write(0xFF) << 16;
+            ocr |= _spi.write(0xFF) << 8;
+            ocr |= _spi.write(0xFF) << 0;
+//            printf("OCR = 0x%08X\n", ocr);
+            _cs = 1;
+            _spi.write(0xFF);
+            return response;
+        }
+    }
+    _cs = 1;
+    _spi.write(0xFF);
+    return -1; // timeout
+}
+
+int SDFileSystem::_cmd8() {
+    _cs = 0; 
+    
+    // send a command
+    _spi.write(0x40 | 8); // CMD8
+    _spi.write(0x00);     // reserved
+    _spi.write(0x00);     // reserved
+    _spi.write(0x01);     // 3.3v
+    _spi.write(0xAA);     // check pattern
+    _spi.write(0x87);     // crc
+
+    // wait for the repsonse (response[7] == 0)
+    for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
+        char response[5];
+        response[0] = _spi.write(0xFF);
+        if(!(response[0] & 0x80)) {
+                for(int j=1; j<5; j++) {
+                    response[i] = _spi.write(0xFF);
+                }
+                _cs = 1;
+                _spi.write(0xFF);
+                return response[0];
+        }
+    }
+    _cs = 1;
+    _spi.write(0xFF);
+    return -1; // timeout
+}
+
+int SDFileSystem::_read(char *buffer, int length) {
+    _cs = 0;
+
+    // read until start byte (0xFF)
+    while(_spi.write(0xFF) != 0xFE);
+
+    // read data
+    for(int i=0; i<length; i++) {
+        buffer[i] = _spi.write(0xFF);
+    }
+    _spi.write(0xFF); // checksum
+    _spi.write(0xFF);
+
+    _cs = 1;    
+    _spi.write(0xFF);
+    return 0;
+}
+
+int SDFileSystem::_write(const char *buffer, int length) {
+    _cs = 0;
+    
+    // indicate start of block
+    _spi.write(0xFE);
+    
+    // write the data
+    for(int i=0; i<length; i++) {
+        _spi.write(buffer[i]);
+    }
+    
+    // write the checksum
+    _spi.write(0xFF); 
+    _spi.write(0xFF);
+
+    // check the repsonse token
+    if((_spi.write(0xFF) & 0x1F) != 0x05) {
+        _cs = 1;
+        _spi.write(0xFF);        
+        return 1;
+    }
+
+    // wait for write to finish
+    while(_spi.write(0xFF) == 0);
+
+    _cs = 1; 
+    _spi.write(0xFF);
+    return 0;
+}
+
+static int ext_bits(char *data, int msb, int lsb) {
+    int bits = 0;
+    int size = 1 + msb - lsb; 
+    for(int i=0; i<size; i++) {
+        int position = lsb + i;
+        int byte = 15 - (position >> 3);
+        int bit = position & 0x7;
+        int value = (data[byte] >> bit) & 1;
+        bits |= value << i;
+    }
+    return bits;
+}
+
+int SDFileSystem::_sd_sectors() {
+
+    // CMD9, Response R2 (R1 byte + 16-byte block read)
+    if(_cmdx(9, 0) != 0) {
+        fprintf(stderr, "Didn't get a response from the disk\n");
+        return 0;
+    }
+    
+    char csd[16];    
+    if(_read(csd, 16) != 0) {
+        fprintf(stderr, "Couldn't read csd response from disk\n");
+        return 0;
+    }
+
+    // csd_structure : csd[127:126]
+    // c_size        : csd[73:62]
+    // c_size_mult   : csd[49:47]
+    // read_bl_len   : csd[83:80] - the *maximum* read block length
+
+    int csd_structure = ext_bits(csd, 127, 126);
+    int c_size = ext_bits(csd, 73, 62);
+    int c_size_mult = ext_bits(csd, 49, 47);
+    int read_bl_len = ext_bits(csd, 83, 80);
+
+//    printf("CSD_STRUCT = %d\n", csd_structure);
+    
+    if(csd_structure != 0) {
+        fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
+        return 0;
+    }
+             
+    // memory capacity = BLOCKNR * BLOCK_LEN
+    // where
+    //  BLOCKNR = (C_SIZE+1) * MULT
+    //  MULT = 2^(C_SIZE_MULT+2) (C_SIZE_MULT < 8)
+    //  BLOCK_LEN = 2^READ_BL_LEN, (READ_BL_LEN < 12)         
+                            
+    int block_len = 1 << read_bl_len;
+    int mult = 1 << (c_size_mult + 2);
+    int blocknr = (c_size + 1) * mult;
+    int capacity = blocknr * block_len;
+        
+    int blocks = capacity / 512;
+        
+    return blocks;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDFileSystem.h	Sat Sep 03 17:06:30 2011 +0000
@@ -0,0 +1,66 @@
+/* mbed Microcontroller Library - SDFileSystem
+ * Copyright (c) 2008-2009, sford
+ */
+ 
+// VERY DRAFT CODE!!! 
+
+#ifndef SDFILESYSTEM_H
+#define SDFILESYSTEM_H
+
+#include "mbed.h"
+#include "FATFileSystem.h"
+
+/* Class: SDFileSystem
+ *  Access the filesystem on an SD Card using SPI
+ *
+ * Example:
+ * > SDFileSystem sd(p5, p6, p7, p12, "sd");
+ * > 
+ * > int main() {
+ * >     FILE *fp = fopen("/sd/myfile.txt", "w");
+ * >     fprintf(fp, "Hello World!\n");
+ * >     fclose(fp);
+ * > }
+ */
+class SDFileSystem : public FATFileSystem {
+public:
+
+    /* Constructor: SDFileSystem
+     *  Create the File System for accessing an SD Card using SPI
+     *
+     * Variables:
+     *  mosi - SPI mosi pin connected to SD Card
+     *  miso - SPI miso pin conencted to SD Card
+     *  sclk - SPI sclk pin connected to SD Card
+     *  cs   - DigitalOut pin used as SD Card chip select
+   *  name - The name used to access the filesystem
+     */
+    SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name);
+    virtual int disk_initialize();
+    virtual int disk_write(const char *buffer, int block_number);
+    virtual int disk_read(char *buffer, int block_number);    
+    virtual int disk_status();
+    virtual int disk_sync();
+    virtual int disk_sectors();
+
+protected:
+
+    int _cmd(int cmd, int arg);
+    int _cmdx(int cmd, int arg);
+    int _cmd8();
+    int _cmd58();
+    int initialise_card();
+    int initialise_card_v1();
+    int initialise_card_v2();
+    
+    
+    int _read(char *buffer, int length);
+    int _write(const char *buffer, int length);
+    int _sd_sectors();
+    int _sectors;
+    
+    SPI _spi;
+    DigitalOut _cs;     
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Sep 03 17:06:30 2011 +0000
@@ -0,0 +1,279 @@
+//////////////////////////////////////
+// White Wizard Board (PAT.PEND)    //
+// Save IR data to microSD card.    //
+//                                  //
+// Nest Egg Inc. 2011/7/9           //
+//                                  //
+//////////////////////////////////////
+#include "mbed.h"
+#include "SDFileSystem.h"
+
+//#define SDch        0x05
+#define MAXdatanum  1000
+#define TimeLimit   3000
+#define pul38khz       0.0263
+#define pul38k_ON      0.0131
+#define pul38k_OFF     0.0
+//#define TEST 1
+
+//prototype
+void SDsave(int[], int[], int);
+void send_pulse(int, int);
+
+SDFileSystem sd(p5, p6, p7, p8, "sd");
+
+//DigitalIn IR(p9);
+
+InterruptIn IR(p9);
+
+DigitalOut myled1(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut myled4(LED4);
+
+PwmOut Pulse_pin(p21);
+
+int trigger = 0;
+int saved = 0;
+int datanum = 0;
+int i = 0;
+int    IRdata[MAXdatanum];
+int     pulsetime[MAXdatanum];
+
+
+void triggerOn() {
+    trigger = 1;
+    IRdata[i] = 0;
+    pulsetime[i]=0;
+    
+    if(i < MAXdatanum){
+        while(IR==0 && pulsetime[i]<=15000){
+            ++pulsetime[i];
+            wait_us(50);
+            
+        }
+        
+        if(pulsetime[i]>=15000){
+            printf(" pulsetime[i] >= TimeLimit !\n");
+            datanum = i;
+            i = MAXdatanum;
+        }
+        
+        ++i;
+    }
+}
+
+
+void triggerOff() {
+    trigger = 0;
+    pulsetime[i]=0;
+    IRdata[i] = 1;    
+    
+    if(i < MAXdatanum){
+        while(IR==1 && pulsetime[i]<=15000){
+            ++pulsetime[i];
+            wait_us(50);
+            
+        }
+        
+        if(pulsetime[i]>=15000){
+            printf(" pulsetime[i] >= TimeLimit !\n");
+            datanum = i;
+            i = MAXdatanum;
+        }
+        
+        ++i;
+    }
+}
+
+
+int main(){
+    //Buffer is 100 pulses.
+    //int    IRdata[MAXdatanum];
+    //int     pulsetime[MAXdatanum];
+    //int     i = 0;
+    
+    myled1 = 0;
+    myled2 = 0;
+    myled3 = 0;
+    myled4 = 0;
+    
+    myled1 = 1;
+    
+    IR.fall(&triggerOn);
+    IR.rise(&triggerOff);
+    
+    printf("start!\n");
+    
+    while(1){
+        IR.fall(&triggerOn);
+        IR.rise(&triggerOff);
+        
+        if(i >= MAXdatanum && i!= (MAXdatanum + 100)){
+            printf("Save start!\n");
+            SDsave(IRdata, pulsetime,datanum);
+            i = MAXdatanum + 100;
+            printf("Finish!");
+        }
+    }
+#ifdef TEST
+
+#else
+    while(1){
+    
+        if(trigger == 0 && saved == 0){   //no signal
+            ;
+        }else if(trigger == 1 && saved == 0){ //"save" start
+            //IR.fall(NULL);
+            for(i = 0; i < MAXdatanum; ++i){
+                pulsetime[i] = 0;   //init
+                
+                if(IR == 1){
+                    //check signal type
+                    IRdata[i] = 1;
+                    
+                    while(IR==1 && pulsetime[i]<=TimeLimit){  //while IR = 1
+                        //check time
+                        ++pulsetime[i];
+                        wait_us(50);    //count by 100 usec
+                    }
+                
+                
+                }else{
+                    //check signal type
+                    IRdata[i] = 0;
+                    
+                    while(IR==0 && pulsetime[i]<=TimeLimit){  //while IR = 0
+                        //check time
+                        ++pulsetime[i];
+                        wait_us(50);    //count by 100 usec
+                        
+                    }
+                    
+                }
+                
+                datanum = i;
+                            
+                if( pulsetime[i] >= TimeLimit){
+                    printf(" pulsetime[i] >= TimeLimit !\n");
+                    i = MAXdatanum;
+                }
+                
+            }
+            
+            SDsave(IRdata, pulsetime,datanum);   
+        }else{
+            ;
+        }
+    }
+#endif
+    
+#ifdef TEST    
+    IRdata[0] = 1;
+    pulsetime[0] = 555;
+    IRdata[1] = 0;
+    pulsetime[1] = 777;
+    SDsave(IRdata, pulsetime,2);
+#endif
+
+    while(1){
+    }
+    
+}
+
+void SDsave(int IRdata1[], int pulsetime1[], int datanum1){
+
+    int j = 0;
+    
+    //channel No must be A4 A3 A2 A1
+    //sd.SetCh(SDch);    //channel No 0101(=0x05), depend on your SPI module setting. (1:High 0:Low)
+
+    printf("Start to save data\n");   
+    myled2 = 1;
+        
+    FILE *fp = fopen("/sd/IRDATA.csv", "w");
+    if(fp == NULL) {
+        error("Could not open file for write\n");
+        myled3 = 1;
+    }
+    
+#ifdef TEST
+    fprintf(fp, "%d\n",datanum1);
+    fprintf(fp, "%d,%d,\n",IRdata1[0], pulsetime1[0]);
+    fprintf(fp, "%d,%d,\n",IRdata1[1], pulsetime1[1]);
+#else
+
+    fprintf(fp, "%d\n",datanum1);
+    for(j=0;j<datanum1;++j){
+        fprintf(fp, "%d,%d,\n",IRdata1[j], pulsetime1[j]);
+    }
+#endif
+
+    
+    fclose(fp);
+    saved = 1;
+    printf("Saved!\n");
+    
+    //sd.SetCh(0x00);    //not select
+    
+//#ifdef TEST
+    wait(1);
+    //sd.SetCh(SDch);    //channel No 0101(=0x05), depend on your SPI module setting. (1:High 0:Low)
+    printf("again\n");
+    int pHL = 0;    
+    int t = 0; 
+    FILE *fp1 = fopen("/sd/IRdata.csv", "r");
+    
+    datanum = 0;
+    
+    fscanf(fp1, "%d\n",&datanum1);    //read from SD
+    printf("datanum, %d\n",datanum1);
+    
+    for(j=0;j<datanum1;++j){
+        fscanf(fp1, "%d,%d,\n", &pHL, &t);    //read from SD
+        
+        send_pulse(pHL,t);
+        
+        //printf("ans, %d,%d,\n", pHL, t);
+    }
+    
+    fclose(fp1);
+    printf("close fp1\n");
+    
+//#endif
+     
+    myled3 = 1;
+    myled4 = 1;
+}   
+
+
+void send_pulse(int pHL, int t){
+
+    int k = 0;
+    int err = 0;
+    
+    Pulse_pin.period(pul38khz);
+    
+    if(pHL == 0){
+        //38kHz pulse on
+        Pulse_pin.pulsewidth(pul38k_ON);
+        
+    }else if(pHL == 1){
+        //38kHz pulse off
+        Pulse_pin.pulsewidth(pul38k_OFF);
+        
+    }else{
+        Pulse_pin.pulsewidth(pul38k_OFF);
+        printf("\n\n-----Data format is incorrect!!-----\n pHL = %d, t = %d \n", pHL, t);
+        err = 1;
+        
+    }
+    
+    if(err == 0){
+        for(k = 0; k < t; ++k){
+            wait_us(50);
+        }
+    }
+    
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Sep 03 17:06:30 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/32af5db564d4