1.资源介绍

该项目主要为LPC55S69开发板的体验项目。该开发板的主要功能如下图所示。

LPC55S69-EVK开发板是NXP公司推出的，LPC55S6x MCU家族是全球首款基于通用Cortex-M33的微控制器，控制器为双核结构，运行频率高达100MHz。

开发板具有USB、SD卡插槽、音频输入输出、I2C、SPI等接口，并支持mikroBUS接口扩展。

2.功能介绍

本次任务主要是制作一个通过TF卡获取音乐播放的程序，主要使用到FATFS和I2S，因此可以通过配置基础代码进行修改，实现最终功能。

3.代码

    
		if (sdcardWaitCardInsert() != kStatus_Success)
				{
						return -1;
				}

				if (f_mount(&g_fileSystem, driverNumberBuffer, 0U))
				{
						PRINTF("Mount volume failed.\r\n");
						return -1;
				}

		#if (FF_FS_RPATH >= 2U)
				error = f_chdrive((char const *)&driverNumberBuffer[0U]);
				if (error)
				{
						PRINTF("Change drive failed.\r\n");
						return -1;
				}
		#endif


		error = f_open(&g_fileObject, _T("/song.wav"), (FA_READ | FA_OPEN_EXISTING));
    if (error)
    {
        if (error == FR_EXIST)
        {
            PRINTF("File exists.\r\n");
        }
        else
        {
            PRINTF("Open file failed.\r\n");
            return -1;
        }
    }


				
    PRINTF("Configure WM8904 codec\r\n");

    /* protocol: i2s
     * sampleRate: 48K
     * bitwidth:16
     */
    if (CODEC_Init(&codecHandle, &boardCodecConfig) != kStatus_Success)
    {
        PRINTF("WM8904_Init failed!\r\n");
        assert(false);
    }

    /* Initial volume kept low for hearing safety.
     * Adjust it to your needs, 0-100, 0 for mute, 100 for maximum volume.
     */
    if (CODEC_SetVolume(&codecHandle, kCODEC_PlayChannelHeadphoneLeft | kCODEC_PlayChannelHeadphoneRight, 30U) !=
        kStatus_Success)
    {
        assert(false);
    }

    PRINTF("Configure I2S\r\n");
I2S_TxGetDefaultConfig(&s_TxConfig);
    s_TxConfig.divider     = DEMO_I2S_CLOCK_DIVIDER;
    s_TxConfig.masterSlave = DEMO_I2S_TX_MODE;
    I2S_TxInit(DEMO_I2S_TX, &s_TxConfig);

//    StartSoundPlayback();
//						s_TxTransfer.data     = &music1[0];
//						s_TxTransfer.dataSize = sizeof(music1);

//						I2S_TxTransferCreateHandle(DEMO_I2S_TX, &s_TxHandle, TxCallback, (void *)&s_TxTransfer);
//						I2S_TxTransferNonBlocking(DEMO_I2S_TX, &s_TxHandle, s_TxTransfer);
						
		error = f_read(&g_fileObject, music1, sizeof(music1), &bytesRead);
		if ((error) || (bytesRead != sizeof(music1)))
		{
				PRINTF("Read file failed. \r\n");
				failedFlag = true;
		}
		musicflag=1;
		s_TxTransfer.data     = &music1[0];
		s_TxTransfer.dataSize = sizeof(music1);
		I2S_TxTransferCreateHandle(DEMO_I2S_TX, &s_TxHandle, TxCallback, (void *)&s_TxTransfer);
		I2S_TxTransferNonBlocking(DEMO_I2S_TX, &s_TxHandle, s_TxTransfer);
	
		for(;;)
		{
			if(musicflag2!=musicflag)
			{
				if(musicflag==0)
				{
						error = f_read(&g_fileObject, music1, sizeof(music1), &bytesRead);
						if ((error) || (bytesRead != sizeof(music1)))
						{
								PRINTF("Read file failed. \r\n");
								failedFlag = true;
							  break;
						}
				}
				else
				{
				    error = f_read(&g_fileObject, music2, sizeof(music2), &bytesRead);
						if ((error) || (bytesRead != sizeof(music2)))
						{
								PRINTF("Read file failed. \r\n");
								failedFlag = true;
						  	break;
						}
				}
				musicflag2=musicflag;
			}
			
		}

4.功能展示

详见视频

5.心得体会

LPC55S69开发板还是比较好用的，只是用惯了CubeMX再用

MCUXpresso Config Tools v10确实有些用不惯，不过经过半天的学习，基本上可以正式使用该软件进行开发了。

6.实物图