３）usbd_sp
（１）<usbd_sp.h>
/** Project Name: STM170_USB_SP_ISO File Name: usbd_sp.h Description: USB speaker with isochronous transfer Generation Information : Device : STM32F411CEU6 Version : 170 Created on : 2023/11/24 */ /** Copyright (c) 2023 luke24e-hbid This software is released under the MIT License. http://opensource.org/licenses/mit-license.php */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /* Define to prevent recursive inclusion -------------------------------------*/ #ifndef INC_USBD_SP_H_ #define INC_USBD_SP_H_ /* Private defines -----------------------------------------------------------*/ #define SYSTEM_FREQ 96000000U #ifndef USBD_AUDIO_FREQ /* AUDIO Class Config */ #define USBD_AUDIO_FREQ 48000U #endif /* USBD_AUDIO_FREQ */ #define DAC_BUF_SIZE ((USBD_AUDIO_FREQ * AUDIO_OUT_PACKET_NUM) / 1000U) #define TIM2_P_BASE ((uint32_t)(SYSTEM_FREQ / USBD_AUDIO_FREQ)) // #define TIM2_P_BASE 2000 #define AUDIO_ISO_FS_INIT 48000U #define AUDIO_ISO_FS_DMAX 750U #define TIM1_P_BASE DAC_BUF_SIZE #define DMA_BUF_SIZE2 ((uint16_t)(DAC_BUF_SIZE * 2)) #define DAC_BUF_SIZE4 ((int32_t)(DAC_BUF_SIZE * 4)) // Isochronous Async endpoint /* Input endpoint is for feedback. See USB 1.1 Spec, 5.10.4.2 Feedback. */ #define AUDIO_IN_PACKET 3U #define USBD_EP_TYPE_ISOC_ASYNC 0x05U #define AUDIO_IN_EP 0x81U #define SOF_RATE 0x02U // bRefresh 4ms = 2^2 // Main Sequence enum typedef enum { SEQ_IDLE, SEQ_START, SEQ_PLAY, SEQ_PAUSE, } SEQ_MAIN; // USBD AUDIO DataOut Sequence enum typedef enum { RD_IDLE, RD_START, RD_PLAY, } SEQ_RDEN; // USBD AUDIO DataOut wr_ptr status typedef enum { WR_PTR_IDLE, WR_PTR_1st, WR_PTR_INQ, } STATE_WR_PTR; // USBD AUDIO Data decode union typedef union { int16_t i16t; uint8_t u8t[2]; } U8T2I16T; // ISO Control Value typedef struct { uint32_t fs; // ISO Feed Back Value volatile uint32_t tx_flag; // ISO busy flag volatile uint32_t fnsof; // OTG_FS_DSTS.FNSOF:Frame number of the received SOF uint32_t ofs_packet; // Offset of Packet uint16_t usbintn; // Number of USB INT. // uint16_t ofs_dac; // Offset of DAC buffer // int32_t ofs_diff; // Difference between Packet and DAC buffer } ISO_ControlTypeDef; /* Function prototype declaration ------------------------------------------*/ STATE_WR_PTR usbd_audio_wrinq(STATE_WR_PTR stin); void usbd_sp_iso(void); #endif /* INC_USBD_SP_H_ */
