usb_hw.h

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/****************************************************************************
**
** Copyright (C) 2024 MikroElektronika d.o.o.
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** This file is part of the mikroSDK package
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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) {
    uint16_t timeout = 10000;
    // Enable PORTA clock.
    RCC->IOPENR |= RCC_IOPENR_GPIOAEN;
    // Enable system configuration controller clock.
    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
    // Enable USB clock.
    RCC->APB1ENR |= RCC_APB1ENR_USBEN;
    // Make sure HSI48 is turned on.
    RCC->CRRCR |= RCC_CRRCR_HSI48ON;
    // Wait for for HSI48 to stabilize.
    do {
        timeout--;
    } while(!(RCC->CRRCR & RCC_CRRCR_HSI48RDY) || (0 == timeout));
    // Buffer used to generate VREFINT reference for 
    // the HSI48 oscillator switched ON.
    SYSCFG->CFGR3 = SYSCFG_CFGR3_ENREF_HSI48;
    // Select HSI48 as USB clock source.
    RCC->CCIPR |= RCC_CCIPR_HSI48SEL;
}
 
 // usb
 // middleware
 
#ifdef __cplusplus
}
#endif
 
#endif // _USB_HW_H_
// ------------------------------------------------------------------------- END