usb_hw.h

Go to the documentation of this file.

/****************************************************************************
**
** Copyright (C) 2024 MikroElektronika d.o.o.
** Contact: https://www.mikroe.com/contact
**
** This file is part of the mikroSDK package
**
** Commercial License Usage
**
** Licensees holding valid commercial NECTO compilers AI licenses may use this
** file in accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The MikroElektronika Company.
** For licensing terms and conditions see
** https://www.mikroe.com/legal/software-license-agreement.
** For further information use the contact form at
** https://www.mikroe.com/contact.
**
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used for
** non-commercial projects under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** 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,
** OF MERCHANTABILITY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
** TO THE WARRANTIES 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.
**
****************************************************************************/
#ifndef _USB_HW_H_
#define _USB_HW_H_
 
#ifdef __cplusplus
extern "C"{
#endif
 
#include "mcu.h"
#include "interrupts.h"
// Note: Added for MikroE implementation.
// MikroE interrupt source uses NVIC -> (IRQx + 16).
#define NVIC_EnableIRQ(_x)  interrupt_enable(_x + 16)
#define NVIC_DisableIRQ(_x) interrupt_disable(_x + 16)
#define power_set()         ( USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_PWRDWN )
#ifdef USB_OTG_GCCFG_VBUSASEN
#define vbus_enable()       ( USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSASEN )
#else
#define vbus_enable()       ( USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN )
#endif
    
#define GPIOA_AFRH_PIN11_AF14 (0x0000E000)
#define GPIOA_AFRH_PIN12_AF14 (0x000E0000)
 
static inline void usb_hw_init(void) {
    // Enable clock for PORT A.
    RCC->APB1ENR |= RCC_APB1ENR_PWREN;
    RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
 
    // Alternate function enable for pins PA12 and PA11.
    GPIOA->MODER |= GPIO_MODER_MODER11_1;
    GPIOA->MODER |= GPIO_MODER_MODER12_1;
    // Pins speed selection.
    GPIOA->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR11_0;
    GPIOA->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR11_1;
    GPIOA->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR12_0;
    GPIOA->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR12_1;
    // Setting alternate function AF10 for pins A11, A12.
    GPIOA->AFR[1] |= GPIOA_AFRH_PIN11_AF14;
    GPIOA->AFR[1] |= GPIOA_AFRH_PIN12_AF14;
    
    // Check if the division factor for PLL -> USB clock is set correctly.
    if ( ( RCC->CFGR & RCC_CFGR_PLLMUL) == RCC_CFGR_PLLMUL12 )
        RCC->CFGR |= RCC_CFGR_USBPRE_DIV1;
 
    // USB_OTG_FS Clock enable.
    RCC->APB1ENR |= RCC_APB1ENR_USBEN;
    // System Clock Configuration Clock enable.
    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
}
 
 // usb
 // middleware
 
#ifdef __cplusplus
}
#endif
 
#endif // _USB_HW_H_
// ------------------------------------------------------------------------- END