Funpack11期于10月31日截止后,到現(xiàn)在已審核完畢,相信審核通過的小伙伴都已經(jīng)收到祝賀郵件了,那就靜等返款吧。
本期的任務(wù)也是很有用意思,四選一,難度中等。這款來自NXP的強大的LPC55S69-EVK在群友們和各種開源資料的幫助下被大家玩的非常深入,輕松完成這期的幾個任務(wù)。
下面就來看看vic網(wǎng)友如何使用本期板卡實現(xiàn)音頻播放器的吧。以下項目已開源在電子森林:https://www.eetree.cn/project/detail/626,大家感興趣的可以來一起學習。
1. 實現(xiàn)功能說明本次使用LCP55S69-EVK開發(fā)板顯示的功能是,任務(wù)一:讀取SD卡中的音頻文件,使用板卡上的3.5mm音頻接口播放音樂。2. 功能代碼展示2.1. 主函數(shù)在主函數(shù)中主要是對需要用到的外設(shè)進行初始化,例如:USART、I2C、I2S、Codec等,最后創(chuàng)兩個任務(wù)分別用于完成SD卡管理以及通過USART0提供shell接口。
2.2. SD卡管理任務(wù)SD卡任務(wù)的代碼如下所示,其主要的作用是:SD在插入時會觸發(fā)中斷,最終觸發(fā)到當前任務(wù),用于完成SD卡的掛載操作。int main(void)
{
int ret;
/* set BOD VBAT level to 1.65V */
POWER_SetBodVbatLevel(kPOWER_BodVbatLevel1650mv, kPOWER_BodHystLevel50mv, false);
CLOCK_EnableClock(kCLOCK_InputMux);
CLOCK_EnableClock(kCLOCK_Iocon);
CLOCK_EnableClock(kCLOCK_Gpio0);
CLOCK_EnableClock(kCLOCK_Gpio1);
/* USART0 clock */
CLOCK_AttachClk(BOARD_DEBUG_UART_CLK_ATTACH);
/* I2C clock */
CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
PMC->PDRUNCFGCLR0 |= PMC_PDRUNCFG0_PDEN_XTAL32M_MASK; /*!< Ensure XTAL16M is on */
PMC->PDRUNCFGCLR0 |= PMC_PDRUNCFG0_PDEN_LDOXO32M_MASK; /*!< Ensure XTAL16M is on */
SYSCON->CLOCK_CTRL |= SYSCON_CLOCK_CTRL_CLKIN_ENA_MASK; /*!< Ensure CLK_IN is on */
ANACTRL->XO32M_CTRL |= ANACTRL_XO32M_CTRL_ENABLE_SYSTEM_CLK_OUT_MASK;
/*!< Switch PLL0 clock source selector to XTAL16M */
CLOCK_AttachClk(kEXT_CLK_to_PLL0);
const pll_setup_t pll0Setup = {
.pllctrl = SYSCON_PLL0CTRL_CLKEN_MASK | SYSCON_PLL0CTRL_SELI(2U) | SYSCON_PLL0CTRL_SELP(31U),
.pllndec = SYSCON_PLL0NDEC_NDIV(125U),
.pllpdec = SYSCON_PLL0PDEC_PDIV(8U),
.pllsscg = {0x0U, (SYSCON_PLL0SSCG1_MDIV_EXT(3072U) | SYSCON_PLL0SSCG1_SEL_EXT_MASK)},
.pllRate = 24576000U,
.flags = PLL_SETUPFLAG_WAITLOCK};
/*!< Configure PLL to the desired values */
CLOCK_SetPLL0Freq(&pll0Setup);
CLOCK_SetClkDiv(kCLOCK_DivPll0Clk, 0U, true);
CLOCK_SetClkDiv(kCLOCK_DivPll0Clk, 1U, false);
/* I2S clocks */
CLOCK_AttachClk(kPLL0_DIV_to_FLEXCOMM6);
CLOCK_AttachClk(kPLL0_DIV_to_FLEXCOMM7);
/* Attach PLL clock to MCLK for I2S, no divider */
CLOCK_AttachClk(kPLL0_to_MCLK);
SYSCON->MCLKDIV = SYSCON_MCLKDIV_DIV(0U);
SYSCON->MCLKIO = 1U;
/* reset FLEXCOMM for I2C */
RESET_PeripheralReset(kFC4_RST_SHIFT_RSTn);
/* reset FLEXCOMM for DMA0 */
RESET_PeripheralReset(kDMA0_RST_SHIFT_RSTn);
/* reset FLEXCOMM for I2S */
RESET_PeripheralReset(kFC6_RST_SHIFT_RSTn);
RESET_PeripheralReset(kFC7_RST_SHIFT_RSTn);
/* reset NVIC for FLEXCOMM6 and FLEXCOMM7 */
NVIC_ClearPendingIRQ(FLEXCOMM6_IRQn);
NVIC_ClearPendingIRQ(FLEXCOMM7_IRQn);
/* Enable interrupts for I2S */
EnableIRQ(FLEXCOMM6_IRQn);
EnableIRQ(FLEXCOMM7_IRQn);
/* Initialize the rest */
BOARD_InitPins();
BOARD_BootClockPLL1_150M();
BOARD_InitDebugConsole();
BOARD_InitSysctrl();
PRINTF(" ");
PRINTF("********************************** ");
PRINTF("Maestro audio solutions demo start ");
PRINTF("********************************** ");
PRINTF(" ");
ret = BOARD_CODEC_Init();
if (ret)
{
PRINTF("CODEC_Init failed ");
return -1;
}
if (xTaskCreate(APP_SDCARD_Task, "SDCard Task", SDCARD_TASK_STACK_SIZE, &app, configMAX_PRIORITIES - 4, NULL) !=
pdPASS)
{
PRINTF(" Failed to create application task ");
while (1)
;
}
/* Set shell command task priority = 1 */
if (xTaskCreate(APP_Shell_Task, "Shell Task", SHELL_TASK_STACK_SIZE, &app, configMAX_PRIORITIES - 5,
&app.shell_task_handle) != pdPASS)
{
PRINTF(" Failed to create application task ");
while (1)
;
}
/* Run RTOS */
vTaskStartScheduler();
/* Should not reach this statement */
return 0;
}
2.3. shell任務(wù)shell任務(wù)的主要目的通過USART0(與Link2的虛擬串口鏈接),為用戶提供一個可以控制播放器的操作接口,主要處理函數(shù)如下所示:void APP_SDCARD_Task(void *param)
{
const TCHAR driverNumberBuffer[3U] = {SDDISK + '0', ':', '/'};
FRESULT error;
app_handle_t *app = (app_handle_t *)param;
app->sdcardSem = xSemaphoreCreateBinary();
BOARD_SD_Config(&g_sd, APP_SDCARD_DetectCallBack, BOARD_SDMMC_SD_HOST_IRQ_PRIORITY, app);
PRINTF("[APP_SDCARD_Task] start ");
/* SD host init function */
if (SD_HostInit(&g_sd) != kStatus_Success)
{
PRINTF("[APP_SDCARD_Task] SD host init failed. ");
vTaskSuspend(NULL);
}
/* Small delay for SD card detection logic to process */
vTaskDelay(100 / portTICK_PERIOD_MS);
while (1)
{
/* Block waiting for SDcard detect interrupt */
xSemaphoreTake(app->sdcardSem, portMAX_DELAY);
if (app->sdcardInserted != app->sdcardInsertedPrev)
{
app->sdcardInsertedPrev = app->sdcardInserted;
SD_SetCardPower(&g_sd, false);
if (app->sdcardInserted)
{
/* power on the card */
SD_SetCardPower(&g_sd, true);
if (f_mount(&app->fileSystem, driverNumberBuffer, 0U))
{
PRINTF("[APP_SDCARD_Task] Mount volume failed. ");
continue;
}
#if (FF_FS_RPATH >= 2U)
error = f_chdrive((char const *)&driverNumberBuffer[0U]);
if (error)
{
PRINTF("[APP_SDCARD_Task] Change drive failed. ");
continue;
}
#endif
PRINTF("[APP_SDCARD_Task] SD card drive mounted ");
xSemaphoreGive(app->sdcardSem);
}
}
}
}
uint32_t ulTaskGenericNotifyTake( UBaseType_t uxIndexToWait,
BaseType_t xClearCountOnExit,
TickType_t xTicksToWait )
{
uint32_t ulReturn;
configASSERT( uxIndexToWait < configTASK_NOTIFICATION_ARRAY_ENTRIES );
taskENTER_CRITICAL();
{
/* Only block if the notification count is not already non-zero. */
if( pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] == 0UL )
{
/* Mark this task as waiting for a notification. */
pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskWAITING_NOTIFICATION;
if( xTicksToWait > ( TickType_t ) 0 )
{
prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
traceTASK_NOTIFY_TAKE_BLOCK( uxIndexToWait );
/* All ports are written to allow a yield in a critical
* section (some will yield immediately, others wait until the
* critical section exits) - but it is not something that
* application code should ever do. */
portYIELD_WITHIN_API();
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
taskEXIT_CRITICAL();
taskENTER_CRITICAL();
{
traceTASK_NOTIFY_TAKE( uxIndexToWait );
ulReturn = pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ];
if( ulReturn != 0UL )
{
if( xClearCountOnExit != pdFALSE )
{
pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = 0UL;
}
else
{
pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = ulReturn - ( uint32_t ) 1;
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskNOT_WAITING_NOTIFICATION;
}
taskEXIT_CRITICAL();
return ulReturn;
}
2.4. codec初始化codec使用的是板載的wm8904,初始化代碼如下所示。
3. 功能配置功能配置使用的NXP提供的MCUXpresso Config Tools,各個配置項如下所示。 3.1. 管腳配置主要是對用到的USART、I2C、SDIF等外設(shè)管腳進行初始化。 3.2. 時鐘配置時鐘配置如下所示,只配置了基本的時鐘以及使用到的外設(shè)時鐘。 ?4. 功能展示4.1. 連線方式需要鏈接的是:- 使用Micro USB鏈接電腦和開發(fā)板的調(diào)試串口(主要進行程序下載以及SHELL交互)- 使用3.5MM的接口鏈接開發(fā)板和揚聲器(右邊的是音頻輸出) 5. 心得體會這是第一次使用NXP的MCU進行開發(fā),工具做的很完善,例程支持也很完善。芯片的外設(shè)資源也很豐富??傊褪呛軓姶螅罂梢越柚谶@個芯片做很多有意思的東西。 總體而言,透過Funpack第十一期的活動收益良多。感謝硬禾提供這么好的活動!int BOARD_CODEC_Init(void)
{
CODEC_Init(&codecHandle, &boardCodecConfig);
/* Invert the DAC data in order to output signal with correct polarity - set DACL_DATINV and DACR_DATINV = 1 */
WM8904_WriteRegister((wm8904_handle_t *)codecHandle.codecDevHandle, WM8904_AUDIO_IF_0, 0x1850);
/* Initial volume kept low for hearing safety. */
CODEC_SetVolume(&codecHandle, kCODEC_PlayChannelHeadphoneLeft | kCODEC_PlayChannelHeadphoneRight, 75);
return 0;
}
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原文標題:基于LPC55S69-EVK的音頻播放器 - Funpack11項目分享一
文章出處:【微信號:xiaojiaoyafpga,微信公眾號:電子森林】歡迎添加關(guān)注!文章轉(zhuǎn)載請注明出處。
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