main.cpp

00001 #include "mbed.h"
00002 #include "USBHostDac.h"
00003 
00004 #if defined(TARGET_RZ_A1H)
00005 #include "usb_host_setting.h"
00006 #else
00007 #define USB_HOST_CH     0
00008 #endif
00009 
00010 #if (USB_HOST_CH == 1) //Audio Shield USB1
00011 DigitalOut usb1en(P3_8);
00012 #endif
00013 DigitalIn  button(USER_BUTTON0);
00014 
00015 #define AUDIO_READ_BUFF_SIZE   (2048)
00016 #define AUDIO_WRITE_BUFF_SIZE  (AUDIO_READ_BUFF_SIZE * 2)
00017 
00018 #define AUDIO_WRITE_BUFF_NUM   (2)
00019 
00020 static uint16_t audio_read_buff[AUDIO_READ_BUFF_SIZE/2];
00021 static uint16_t audio_write_buff[AUDIO_WRITE_BUFF_NUM][AUDIO_WRITE_BUFF_SIZE/2];
00022 
00023 Semaphore sem(0);
00024 
00025 void test_task(void const* arg) {
00026     int buf_index = 0;
00027     USBHostDac * p_usbdac = (USBHostDac *)arg;
00028 
00029     while (1) {
00030         sem.wait();
00031 
00032         p_usbdac->send((uint8_t *)audio_write_buff[buf_index], AUDIO_WRITE_BUFF_SIZE, false);
00033 
00034         buf_index++;
00035         if (buf_index >= AUDIO_WRITE_BUFF_NUM) {
00036             buf_index = 0;
00037         }
00038     }
00039 }
00040 
00041 int main() {
00042     int buf_index = 0;
00043 
00044 #if (USB_HOST_CH == 1) //Audio Shield USB1
00045     //Audio Shield USB1 enable
00046     usb1en = 1;        //Outputs high level
00047     Thread::wait(5);
00048     usb1en = 0;        //Outputs low level
00049 #endif
00050 
00051     USBHostDac usbdac;
00052     Thread TestTask(test_task, &usbdac, osPriorityNormal, 1024 * 8);
00053 
00054     while(1) {
00055         // try to connect a usbdac device
00056         while(!usbdac.connect()) {
00057             Thread::wait(500);
00058         }
00059 
00060         while (1) {
00061             // if device disconnected, try to connect again
00062             if (!usbdac.connected()) {
00063                 break;
00064             }
00065             int ret = usbdac.receive((uint8_t *)audio_read_buff, AUDIO_READ_BUFF_SIZE);
00066             if (ret > 0) {
00067                 //1ch -> 2ch
00068                 uint16_t * p_write = audio_write_buff[buf_index];
00069                 uint16_t * p_read  = audio_read_buff;
00070 
00071                 for (int cnt = 0; cnt < (ret / 2); cnt++) {
00072                     *p_write = *p_read;
00073                     p_write++;
00074                     *p_write = *p_read;
00075                     p_write++;
00076                     p_read++;
00077                 }
00078 
00079                 sem.release();
00080 
00081                 buf_index++;
00082                 if (buf_index >= AUDIO_WRITE_BUFF_NUM) {
00083                     buf_index = 0;
00084                 }
00085             }
00086         }
00087     }
00088 }