circuitpython/stmhal/usb.c

/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <string.h>

#include "usbd_core.h"
#include "usbd_desc.h"
#include "usbd_cdc_msc_hid.h"
#include "usbd_cdc_interface.h"
#include "usbd_msc_storage.h"

#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "usb.h"

#ifdef USE_DEVICE_MODE
USBD_HandleTypeDef hUSBDDevice;
#endif

static int dev_is_enabled = 0;
mp_obj_t mp_const_vcp_interrupt = MP_OBJ_NULL;

void pyb_usb_dev_init(usb_device_mode_t mode, usb_storage_medium_t medium) {
#ifdef USE_DEVICE_MODE
    if (!dev_is_enabled) {
        // only init USB once in the device's power-lifetime
        if (mode == USB_DEVICE_MODE_CDC_MSC) {
            USBD_SelectMode(USBD_MODE_CDC_MSC);
        } else {
            USBD_SelectMode(USBD_MODE_CDC_HID);
        }
        USBD_Init(&hUSBDDevice, (USBD_DescriptorsTypeDef*)&VCP_Desc, 0);
        USBD_RegisterClass(&hUSBDDevice, &USBD_CDC_MSC_HID);
        USBD_CDC_RegisterInterface(&hUSBDDevice, (USBD_CDC_ItfTypeDef*)&USBD_CDC_fops);
#if MICROPY_HW_HAS_SDCARD
        if (medium == USB_STORAGE_MEDIUM_FLASH) {
            USBD_MSC_RegisterStorage(&hUSBDDevice, (USBD_StorageTypeDef*)&USBD_FLASH_STORAGE_fops);
        } else {
            USBD_MSC_RegisterStorage(&hUSBDDevice, (USBD_StorageTypeDef*)&USBD_SDCARD_STORAGE_fops);
        }
#else
        USBD_MSC_RegisterStorage(&hUSBDDevice, (USBD_StorageTypeDef*)&USBD_FLASH_STORAGE_fops);
#endif
        USBD_Start(&hUSBDDevice);
    }
    dev_is_enabled = 1;

    // create an exception object for interrupting by VCP
    mp_const_vcp_interrupt = mp_obj_new_exception_msg(&mp_type_OSError, "VCPInterrupt");
#endif
}

void pyb_usb_dev_stop(void) {
    if (dev_is_enabled) {
        USBD_Stop(&hUSBDDevice);
        dev_is_enabled = 0;
    }
}

bool usb_vcp_is_enabled(void) {
    return dev_is_enabled;
}

bool usb_vcp_is_connected(void) {
    return USBD_CDC_IsConnected();
}

void usb_vcp_set_interrupt_char(int c) {
    if (dev_is_enabled) {
        if (c != VCP_CHAR_NONE) {
            mp_obj_exception_clear_traceback(mp_const_vcp_interrupt);
        }
        USBD_CDC_SetInterrupt(c, mp_const_vcp_interrupt);
    }
}

int usb_vcp_rx_num(void) {
    return USBD_CDC_RxNum();
}

char usb_vcp_rx_get(void) {
    return USBD_CDC_RxGet();
}

void usb_vcp_send_strn(const char *str, int len) {
#ifdef USE_DEVICE_MODE
    if (dev_is_enabled) {
        USBD_CDC_Tx(str, len);
    }
#endif
}

void usb_vcp_send_strn_cooked(const char *str, int len) {
#ifdef USE_DEVICE_MODE
    if (dev_is_enabled) {
        for (const char *top = str + len; str < top; str++) {
            if (*str == '\n') {
                USBD_CDC_Tx("\r\n", 2);
            } else {
                USBD_CDC_Tx(str, 1);
            }
        }
    }
#endif
}

void usb_hid_send_report(uint8_t *buf) {
#ifdef USE_DEVICE_MODE
    USBD_HID_SendReport(&hUSBDDevice, buf, 4);
#endif
}

/******************************************************************************/
// code for experimental USB OTG support

#ifdef USE_HOST_MODE

#include "led.h"
#include "usbh_core.h"
#include "usbh_usr.h"
#include "usbh_hid_core.h"
#include "usbh_hid_keybd.h"
#include "usbh_hid_mouse.h"

__ALIGN_BEGIN USBH_HOST USB_Host __ALIGN_END ;

static int host_is_enabled = 0;

void pyb_usb_host_init(void) {
    if (!host_is_enabled) {
        // only init USBH once in the device's power-lifetime
        /* Init Host Library */
        USBH_Init(&USB_OTG_Core, USB_OTG_FS_CORE_ID, &USB_Host, &HID_cb, &USR_Callbacks);
    }
    host_is_enabled = 1;
}

void pyb_usb_host_process(void) {
    USBH_Process(&USB_OTG_Core, &USB_Host);
}

uint8_t usb_keyboard_key = 0;

// TODO this is an ugly hack to get key presses
uint pyb_usb_host_get_keyboard(void) {
    uint key = usb_keyboard_key;
    usb_keyboard_key = 0;
    return key;
}

void USR_MOUSE_Init(void) {
    led_state(4, 1);
    USB_OTG_BSP_mDelay(100);
    led_state(4, 0);
}

void USR_MOUSE_ProcessData(HID_MOUSE_Data_TypeDef *data) {
    led_state(4, 1);
    USB_OTG_BSP_mDelay(50);
    led_state(4, 0);
}

void USR_KEYBRD_Init(void) {
    led_state(4, 1);
    USB_OTG_BSP_mDelay(100);
    led_state(4, 0);
}

void USR_KEYBRD_ProcessData(uint8_t pbuf) {
    led_state(4, 1);
    USB_OTG_BSP_mDelay(50);
    led_state(4, 0);
    usb_keyboard_key = pbuf;
}

#endif // USE_HOST_MODE