Audio Examples

Table of Contents

• API-AUDIO-CASE1:AMIC To USB
• API-AUDIO-CASE2:AMIC To SDM
• API-AUDIO-CASE3:AMIC To I2S
• API-AUDIO-CASE4:DMIC To USB
• API-AUDIO-CASE5:DMIC To SDM
• API-AUDIO-CASE6:DMIC To I2S
• API-AUDIO-CASE7:I2S To USB
• API-AUDIO-CASE8:I2S To SDM
• API-AUDIO-CASE9:USB To SDM
• API-AUDIO-CASE10:USB To I2S

Variables used in the following cases are defined as below

#define MIC_BUFFER_SIZE         4096
volatile signed short MicBuf[MIC_BUFFER_SIZE>>1];

API-AUDIO-CASE1:AMIC To USB

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		usb_irq_init()		enable manual interrupt
		irq_enable()		enable global interrupt
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		gpio_set_func() gpio_set_output_en() gpio_set_input_en() gpio_write()	gpio_set_func(GPIO_PC4, AS_GPIO) gpio_set_output_en(GPIO_PC4, 1) gpio_set_input_en(GPIO_PC4 ,0) gpio_write(GPIO_PC4, 1)	initiate the gpio pin for BIAS of AMIC
		audio_amic_init()	audio_amic_init(AUDIO_16K)	initiate AMIC module as audio input path
		audio_set_usb_output()	audio_set_usb_output(AMIC,AUDIO_16K)	set USB as audio output path
	main_loop()	usb_handle_irq_process()		handle with USB interrupt
		if(usb_audio_mic_cnt)		determine whether the specified interrupt flag is generated
		>audio_tx_data_to_usb(AMIC, AUDIO_16K)	audio_tx_data_to_usb()	send data to USB Host if the specified interrupt flag is generated
		>usb_audio_mic_cnt=0		clear flag and wait for that next interrupt flag

API-AUDIO-CASE2:AMIC To SDM

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		gpio_set_func() gpio_set_output_en() gpio_set_input_en() gpio_write()	gpio_set_func(GPIO_PC4, AS_GPIO) gpio_set_output_en(GPIO_PC4, 1) gpio_set_input_en(GPIO_PC4 ,0) gpio_write(GPIO_PC4, 1)	initiate the gpio pin for BIAS of AMIC
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		audio_amic_init()	audio_amic_init(AUDIO_16K)	initiate AMIC module as audio input path
		audio_set_sdm_output()	audio_set_sdm_output(AMIC,AUDIO_16K,1)	set SDM as audio output path
	main_loop()	None		Main program loop

API-AUDIO-CASE3:AMIC To I2S

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		gpio_set_func() gpio_set_output_en() gpio_set_input_en() gpio_write()	gpio_set_func(GPIO_PC4, AS_GPIO) gpio_set_output_en(GPIO_PC4, 1) gpio_set_input_en(GPIO_PC4 ,0) gpio_write(GPIO_PC4, 1)	initiate the gpio pin for BIAS of AMIC
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		audio_amic_init()	audio_amic_init(AUDIO_16K)	initiate AMIC module as audio input path
		audio_set_i2s_output()	audio_set_i2s_output(AMIC,AUDIO_32K)	set I2S as audio output path
	main_loop()	None		Main program loop

API-AUDIO-CASE4:DMIC To USB

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		usb_irq_init()		enable manual interrupt
		irq_enable()		enable global interrupt
		gpio_set_func() gpio_set_input_en()	gpio_set_func(GPIO_PA0, AS_DMIC) gpio_set_func(GPIO_PA1, AS_DMIC) gpio_set_input_en(GPIO_PA0, 1)	initiate the gpio pin for DATA and CLK of DMIC
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		audio_dmic_init()	audio_dmic_init(AUDIO_16K)	initiate DMIC module as audio input path
		audio_set_usb_output()	audio_set_usb_output(DMIC,AUDIO_16K)	set USB as audio output path
	main_loop()	usb_handle_irq_process()		handle with USB interrupt
		if(usb_audio_mic_cnt)		determine whether the specified interrupt flag is generated
		>audio_tx_data_to_usb(AMIC, AUDIO_16K)	audio_tx_data_to_usb()	send data to USB Host if the specified interrupt flag is generated
		>usb_audio_mic_cnt=0		clear flag and wait for that next interrupt flag

API-AUDIO-CASE5:DMIC To SDM

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		gpio_set_func() gpio_set_input_en()	gpio_set_func(GPIO_PA0, AS_DMIC) gpio_set_func(GPIO_PA1, AS_DMIC) gpio_set_input_en(GPIO_PA0, 1)	initiate the gpio pin for DATA and CLK of DMIC
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		audio_dmic_init()	audio_dmic_init(AUDIO_16K)	initiate DMIC module as audio input path
		audio_set_sdm_output()	audio_set_sdm_output(DMIC,AUDIO_16K,1)	set SDM as audio output path
	main_loop()	None		Main program loop

API-AUDIO-CASE6:DMIC To I2S

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		gpio_set_func() gpio_set_input_en()	gpio_set_func(GPIO_PA0, AS_DMIC) gpio_set_func(GPIO_PA1, AS_DMIC) gpio_set_input_en(GPIO_PA0, 1)	initiate the gpio pin for DATA and CLK of DMIC
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		audio_dmic_init()	audio_dmic_init(AUDIO_32K)	initiate DMIC module as audio input path
		audio_set_i2s_output()	audio_set_i2s_output(AMIC,AUDIO_32K);	set I2S as audio output path
	main_loop()	None		Main program loop

API-AUDIO-CASE7:I2S To USB

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		usb_irq_init()		enable manual interrupt
		irq_enable()		enable global interrupt
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		audio_i2s_init()		initiate I2S module as audio input path
		audio_set_usb_output()	audio_set_usb_output(DMIC,AUDIO_16K)	set USB as audio output path
	main_loop()	usb_handle_irq_process()		handle with USB interrupt
		if(usb_audio_mic_cnt)		determine whether the specified interrupt flag is generated
		>audio_tx_data_to_usb(AMIC, AUDIO_16K)	audio_tx_data_to_usb()	send data to USB Host if the specified interrupt flag is generated
		>usb_audio_mic_cnt=0		clear flag and wait for that next interrupt flag

API-AUDIO-CASE8:I2S To SDM

API-AUDIO-CASE9:USB To SDM

Function	Sub-Function	APIs		Description	Update Status
irq_handler()	None			Interrupt handler function [Mandatory]	2019-1-10
main()	cpu_wakeup_init()			CPU initialization function [Mandatory]
	clock_init()	clock_init(SYS_CLK_24M_Crystal)		Clock initialization function, System Clock is 24M RC by default [optional]
	rf_drv_init()	rf_drv_init(RF_MODE_BLE_1M)		RF mode initialization [optional]
	gpio_init()	gpio_init(1)		GPIO initialization: set the initialization status of all GPIOs [optional]
	user_init()	usb_set_pin_en()		open the DP and DM of USB and enable 1.5k internal pull-up resistor
		usb_irq_init()		enable manual interrupt
		irq_enable()		enable global interrupt
		audio_config_mic_buf()	audio_config_mic_buf((unsigned short*)MicBuf,MIC_BUFFER_SIZE)	set the address and size of buffer for AMIC
		audio_set_sdm_output()	audio_set_sdm_output(DMIC,AUDIO_16K,1)	set SDM as audio output path
		audio_set_usb_output()	audio_set_usb_output(USB_IN,AUDIO_16K)	set USB as audio output path
	main_loop()	usb_handle_irq_process()		handle with USB interrupt
		if(usb_audio_speaker_cnt)		determine whether the specified interrupt flag is generated
		>audio_rx_data_from_usb()	audio_rx_data_from_usb()	receive data from USB Host if the specified interrupt flag is generated
		>usb_audio_speaker_cnt=0		clear flag and wait for that next interrupt flag

API-AUDIO-CASE10:USB To I2S

History Record

Date	Description	Author
2019-1-10	initial release	ZJY/LJW