DS5Dongle-OLED-Edition-steam-machine/src/usb.cpp

//
// Created by awalol on 2026/3/4.
//

#include "tusb.h"
#include "bsp/board_api.h"

uint8_t mute[2]; // 0: SPEAKER(0x02) 1: MIC(0x05)
float volume[2] = {1.0f}; // 0: SPEAKER(0x02) 1: MIC(0x05)

#define UAC1_ENTITY_SPK_FEATURE_UNIT    0x02
#define UAC1_ENTITY_MIC_FEATURE_UNIT    0x05

/*int main() {
    board_init();

    tusb_rhport_init_t dev_init = {
        .role = TUSB_ROLE_DEVICE,
        .speed = TUSB_SPEED_AUTO
    };
    tusb_init(BOARD_TUD_RHPORT, &dev_init);

    board_init_after_tusb();

    while (1) {
        tud_task();
    }
}*/

//--------------------------------------------------------------------+
// Audio Callback Functions
//--------------------------------------------------------------------+

//--------------------------------------------------------------------+
// UAC1 Helper Functions
//--------------------------------------------------------------------+

static bool audio10_set_req_entity(tusb_control_request_t const *p_request, uint8_t *pBuff) {
    uint8_t channelNum = TU_U16_LOW(p_request->wValue);
    uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
    uint8_t entityID = TU_U16_HIGH(p_request->wIndex);
    uint8_t index = entityID == UAC1_ENTITY_SPK_FEATURE_UNIT ? 0 : 1;

    // If request is for our speaker feature unit
    if (entityID == UAC1_ENTITY_SPK_FEATURE_UNIT || entityID == UAC1_ENTITY_MIC_FEATURE_UNIT) {
        switch (ctrlSel) {
            case AUDIO10_FU_CTRL_MUTE:
                switch (p_request->bRequest) {
                    case AUDIO10_CS_REQ_SET_CUR:
                        // Only 1st form is supported
                        TU_VERIFY(p_request->wLength == 1);

                        mute[index] = pBuff[0];

                        TU_LOG2("    Set Mute: %d of entity: %u\r\n", mute[index], entityID);
                        return true;

                    default:
                        return false; // not supported
                }

            case AUDIO10_FU_CTRL_VOLUME:
                switch (p_request->bRequest) {
                    case AUDIO10_CS_REQ_SET_CUR:
                        // Only 1st form is supported
                        TU_VERIFY(p_request->wLength == 2);

                        volume[index] = static_cast<float>(tu_unaligned_read16(pBuff)) / 256;

                        TU_LOG2("    Set Volume: %d dB of entity: %u\r\n", volume[index], entityID);
                        return true;

                    default:
                        return false; // not supported
                }

            // Unknown/Unsupported control
            default:
                TU_BREAKPOINT();
                return false;
        }
    }

    return false;
}

static bool audio10_get_req_entity(uint8_t rhport, tusb_control_request_t const *p_request) {
    uint8_t channelNum = TU_U16_LOW(p_request->wValue);
    uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
    uint8_t entityID = TU_U16_HIGH(p_request->wIndex);
    uint8_t index = entityID == UAC1_ENTITY_SPK_FEATURE_UNIT ? 0 : 1;

    // If request is for our speaker feature unit
    if (entityID == UAC1_ENTITY_SPK_FEATURE_UNIT || entityID == UAC1_ENTITY_MIC_FEATURE_UNIT) {
        switch (ctrlSel) {
            case AUDIO10_FU_CTRL_MUTE:
                // Audio control mute cur parameter block consists of only one byte - we thus can send it right away
                // There does not exist a range parameter block for mute
                TU_LOG2("    Get Mute of entity: %u\r\n", entityID);
                return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, &mute[index], 1);

            case AUDIO10_FU_CTRL_VOLUME:
                switch (p_request->bRequest) {
                    case AUDIO10_CS_REQ_GET_CUR:
                        TU_LOG2("    Get Volume of entity: %u\r\n", entityID); {
                            int16_t vol = volume[index];
                            vol = vol * 256; // convert to 1/256 dB units
                            return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, &vol, sizeof(vol));
                        }

                    case AUDIO10_CS_REQ_GET_MIN:
                        TU_LOG2("    Get Volume min of entity: %u\r\n", entityID); {
                            int16_t min = 1; // 1 dB
                            min = min * 256; // convert to 1/256 dB units
                            return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, &min, sizeof(min));
                        }

                    case AUDIO10_CS_REQ_GET_MAX:
                        TU_LOG2("    Get Volume max of entity: %u\r\n", entityID); {
                            int16_t max = 2; // 2 dB
                            max = max * 256; // convert to 1/256 dB units
                            return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, &max, sizeof(max));
                        }

                    case AUDIO10_CS_REQ_GET_RES:
                        TU_LOG2("    Get Volume res of entity: %u\r\n", entityID); {
                            int16_t res = 0.1 * 256; // 0.1 dB
                            return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, &res, sizeof(res));
                        }
                    // Unknown/Unsupported control
                    default:
                        TU_BREAKPOINT();
                        return false;
                }
                break;

            // Unknown/Unsupported control
            default:
                TU_BREAKPOINT();
                return false;
        }
    }

    return false;
}

// Invoked when audio class specific get request received for an entity
bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *p_request) {
    (void) rhport;

    return audio10_get_req_entity(rhport, p_request);
}

// Invoked when audio class specific set request received for an entity
bool tud_audio_set_req_entity_cb(uint8_t rhport, tusb_control_request_t const *p_request, uint8_t *buf) {
    (void) rhport;

    return audio10_set_req_entity(p_request, buf);
}

void tud_hid_report_complete_cb(uint8_t instance, uint8_t const *report, uint16_t len) {
    (void) instance;
    (void) len;
}