chip/at90usb1287/include/chip/clk.h

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#ifndef CHIP_CLK_H_INCLUDED
#define CHIP_CLK_H_INCLUDED

#include <chip/regs.h>

static inline void clk_enable_at90usb(void)
{
        avr_write_reg8(PLLCSR, AVR_BIT(PLLCSR_PLLP1)
#if CONFIG_CPU_HZ == 8000000UL
                        | AVR_BIT(PLLCSR_PLLP0)
#elif CONFIG_CPU_HZ == 16000000UL
                        | AVR_BIT(PLLCSR_PLLP2)
#else
# error Chip CPU frequency must be 8 MHz or 16 MHz when using the USB peripheral
#endif
                        | AVR_BIT(PLLCSR_PLLE));
        do {
                barrier();
        } while (!(avr_read_reg8(PLLCSR) & AVR_BIT(PLLCSR_PLOCK)));
}

#endif /* CHIP_CLK_H_INCLUDED */

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