/* Copyright 2025 muzkr https://github.com/muzkr
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 *
 */

#include "driver/vcp.h"
#include "usb_config.h"
#include "py32f071_ll_bus.h"

uint8_t VCP_RxBuf[VCP_RX_BUF_SIZE];
volatile uint32_t VCP_RxBufPointer = 0;

void VCP_Init()
{
    LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);
    LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA); // PA12:11
    LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USBD);

    cdc_acm_rx_buf_t rx_buf = {
        .buf = VCP_RxBuf,
        .size = sizeof(VCP_RxBuf),
        .write_pointer = &VCP_RxBufPointer,
    };
    cdc_acm_init(rx_buf);

    NVIC_SetPriority(USBD_IRQn, 3);
    NVIC_EnableIRQ(USBD_IRQn);
}

bool VCP_ScreenshotPing(void)
{
    static uint32_t read_ptr = 0;

    uint32_t write_ptr = VCP_RxBufPointer;

    while (read_ptr != write_ptr)
    {
        uint8_t b = VCP_RxBuf[read_ptr];

        read_ptr++;
        if (read_ptr >= VCP_RX_BUF_SIZE)
            read_ptr = 0;

        if (b == 0x55)
        {
            return true;
        }
    }
    return false;
}