VS1053t.cpp

00001 /* mbed VLSI VS1053t library
00002  *
00003  * Thread based VS1053 class inherited by VS1053b
00004  *
00005  */
00006 
00007 
00008 #include "mbed.h"
00009 #include "rtos.h"
00010 
00011 #include "defines.h"
00012 #include "VS1053t.h"
00013 
00014 VS1053t :: VS1053t(
00015     PinName mosi, PinName miso, PinName sck,
00016     PinName cs, PinName rst, PinName dreq, PinName dcs,
00017     char*   buffer, int  buffer_size, bool thread 
00018     ):
00019     
00020     VS1053( mosi, miso, sck, cs, rst, dreq, dcs,
00021             buffer, buffer_size)
00022 {   }
00023 
00024 Semaphore lock_buff(1) ;
00025 
00026 unsigned int VS1053t::waitBuffer(unsigned int size, uint32_t time) {
00027     int n ;
00028     WaitingSize = size ;
00029     while ((n = VS1053t::bufferFree()) < size) {
00030         if(thread)
00031             lock_buff.wait(time) ;
00032         else
00033             wait_ms(100) ;
00034     }
00035     // if(n < size) { time out
00036     return(n) ;
00037 }
00038 
00039 unsigned char VS1053t::bufferGetByte(void) {
00040     unsigned char retVal = 0x00;
00041     if (bufferCount() > 0x00) {
00042         retVal = *_bufferReadPointer++;
00043         if (_bufferReadPointer >= _buffer + BUFFER_SIZE) {
00044             _bufferReadPointer = _buffer;
00045         }
00046     }
00047     if (thread && (VS1053t::bufferFree() >= WaitingSize))
00048         lock_buff.release() ;
00049     return retVal;
00050 }