usb_hw.h

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#ifndef _USB_HW_H_
#define _USB_HW_H_
 
#ifdef __cplusplus
extern "C"{
#endif
 
#include "mcu.h"
#include <stdint.h>
 
#define analog_function_enable(_pin) (GPIO_PORTD_AMSEL_R |= 1U << _pin)
 
#define GPIO_PORTD_PIN4 (4)
#define GPIO_PORTD_PIN5 (5)
 
static inline void usb_hw_init(void) {
    // Enable clock to D4 and D5 pins - DP/DM pins.
    SYSCTL_RCGC2_R |= SYSCTL_GPIOHBCTL_PORTD;
    // Enable clock to B0 and B1 pins - USB0ID/USB0VBUS pins.
    SYSCTL_RCGC2_R |= SYSCTL_GPIOHBCTL_PORTB;
    // Make sure AHB (Advanced High-Performance Bus) is disabled
    // for previously selected pins.
    SYSCTL_GPIOHBCTL_R &= ~(SYSCTL_GPIOHBCTL_PORTD | SYSCTL_GPIOHBCTL_PORTB);
    // The analog functions of the pins are enabled, the isolation is
    // disabled, and the pins are capable of analog functions.
    analog_function_enable(GPIO_PORTD_PIN4);
    analog_function_enable(GPIO_PORTD_PIN5);
    // Enable general USB clock.
    SYSCTL_RCGC2_R |= SYSCTL_RCGC2_USB0;
}
 
 // usb
 // middleware
 
#ifdef __cplusplus
}
#endif
 
#endif // _USB_HW_H_
// ------------------------------------------------------------------------- END