/*
 * cdc.h
 *
 *  Created on: Nov 6, 2024
 *      Author: true
 */

#ifndef USER_USB_CDC_H_
#define USER_USB_CDC_H_

#ifdef __cplusplus
extern "C" {
#endif



#include <stdio.h>
#include <string.h>



// CDC buffer
#define DEF_CDC_SEND_HOST_BUF_LEN   ( 2 * 512 )             // device to host buffer size
#define DEF_CDC_FROM_HOST_BUF_LEN   ( 2 * 512 )             // host to device buffer size
#define DEF_USB_FS_PACKET_LEN       64                      // USB full speed mode packet size for CDC data
#define DEF_CDC_FROM_HOST_BUF_NUM_MAX   (DEF_CDC_FROM_HOST_BUF_LEN / DEF_USB_FS_PACKET_LEN)   // Serial x transmit buffer size

// CDC default settings
#define DEF_CDC_BAUDRATE         115200                                         /* Default baud rate for serial port */
#define DEF_CDC_STOPBIT          0                                              /* Default stop bit for serial port */
#define DEF_CDC_PARITY           0                                              /* Default parity bit for serial port */
#define DEF_CDC_DATABIT          8                                              /* Default data bit for serial port */



typedef struct __attribute__((packed)) _UART_CTL
{
    uint16_t send_host_ptr;                                                     // data location for data being added to the buffer
    uint16_t send_host_idx;                                                     // data location for data being sent over USB
    volatile uint16_t send_host_count;                                          // amount of data to send

    uint16_t from_host_ptr;
    uint16_t from_host_idx;
    uint16_t from_host_count;

    volatile uint16_t Tx_LoadNum;                                               /* Serial x data send buffer load number */
    volatile uint16_t Tx_DealNum;                                               /* Serial x data send buffer processing number */
    volatile uint16_t from_host_remain;                                             /* Serial x data send buffer remaining unprocessed number */
    volatile uint16_t Tx_PackLen[DEF_CDC_FROM_HOST_BUF_NUM_MAX];                       /* The current packet length of the serial x data send buffer */
    uint8_t  from_host_flag;                                                           /* Serial x data send status */
    uint8_t  pad1;
    uint16_t Tx_CurPackLen;                                                     /* The current packet length sent by serial port x */
    uint16_t Tx_CurPackPtr;                                                     /* Pointer to the packet currently being sent by serial port x */

    uint8_t  usb_send_host_flag;                                                    /* Serial xUSB packet being uploaded flag */
    uint8_t  usb_send_host_zero_flag;                                                 /* Serial xUSB data needs to upload 0-length packet flag */
    uint8_t  usb_from_host_stop_flag;                                                 /* Serial xUSB packet stop down flag */
    uint8_t  pad2;

    uint8_t  cdc_cfg[ 8 ];                                                      /* Serial x parameter configuration (default baud rate is 115200, 1 stop bit, no parity, 8 data bits) */
    uint8_t  usb_send_flag;                                                    /* Serial x interrupt upload status */
    uint8_t  pad3;
    uint16_t USB_Int_UpTimeCount;                                               /* Serial x interrupt upload timing */
} CDC_CTL, *PCDC_CTL;

/***********************************************************************************************************************/
/* Constant, variable extents */
/* The following are serial port transmit and receive related variables and buffers */
extern volatile CDC_CTL Cdc;                                                    /* Serial x control related structure */
extern __attribute__((aligned(4))) uint8_t cdc_from[DEF_CDC_FROM_HOST_BUF_LEN];
extern __attribute__((aligned(4))) uint8_t cdc_send[DEF_CDC_SEND_HOST_BUF_LEN];
/***********************************************************************************************************************/



void CDC_USB_Init(void);
void cdc_from_host_process(void);
void cdc_send_host_process(void);

int usb_cdc_puts(char *buf, int cnt);
int usb_cdc_gets(char *buf, int cnt);



#ifdef __cplusplus
}
#endif

#endif /* USER_USB_CDC_H_ */