usb_hw.h

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/****************************************************************************
**
** Copyright (C) 2024 MikroElektronika d.o.o.
** Contact: https://www.mikroe.com/contact
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** This file is part of the mikroSDK package
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** Alternatively, this file may be used for
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** General Public License version 3 as published by the Free Software
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#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
 
 
static inline void usb_hw_init(void) {
    // Enable clock for PORT_A.
    RCC->AHB1ENR |= RCC_AHB1ENR_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_OSPEEDR_OSPEED11_1;
    GPIOA->OSPEEDR |= GPIO_OSPEEDR_OSPEED12_1;
    // Setting alternate function for pins.
    GPIOA->AFR[1] |= GPIO_AFRH_AFSEL11_1;
    GPIOA->AFR[1] |= GPIO_AFRH_AFSEL11_3;
    GPIOA->AFR[1] |= GPIO_AFRH_AFSEL12_1;
    GPIOA->AFR[1] |= GPIO_AFRH_AFSEL12_3;
 
    // Alternate function enable for pin PA10.
    GPIOA->MODER |= GPIO_MODER_MODER10_1;
    // Configure pin as Open drain.
    #if CFG_TUSB_MCU == OPT_MCU_STM32F2
    GPIOA->OTYPER |= GPIO_OTYPER_OT10;
    #else
    GPIOA->OTYPER |= GPIO_OTYPER_OT10_Msk;
    #endif
    // Configur pin Pull up.
    GPIOA->PUPDR |= GPIO_PUPDR_PUPD10_0;
    // Setting alternate function for pin.
    GPIOA->AFR[1] |= GPIO_AFRH_AFSEL10_1;
    GPIOA->AFR[1] |= GPIO_AFRH_AFSEL10_3;
 
    // USB_OTG_FS Clock enable.
    RCC->AHB2ENR |= RCC_AHB2ENR_OTGFSEN;
    // System Clock Configuration Clock enable.
    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
}
 
 // usb
 // middleware
 
#ifdef __cplusplus
}
#endif
 
#endif // _USB_HW_H_
// ------------------------------------------------------------------------- END