module_universal_io/fw/modules/misc/usb_clock.c

#include "at32f403a_407.h"
#include "usb_clock.h"


//
void usb_clock48m_select(usb_clk48_s clk_s)
{
    if(clk_s == USB_CLK_HICK)
    {
        crm_usb_clock_source_select(CRM_USB_CLOCK_SOURCE_HICK);

        // enable the acc calibration ready interrupt
        crm_periph_clock_enable(CRM_ACC_PERIPH_CLOCK, TRUE);

        // update the c1\c2\c3 value
        acc_write_c1(7980);
        acc_write_c2(8000);
        acc_write_c3(8020);

        // open acc calibration 
        acc_calibration_mode_enable(ACC_CAL_HICKTRIM, TRUE);
    }
    else
    {
        switch(system_core_clock)
        {
            /* 48MHz */
            case 48000000:
                crm_usb_clock_div_set(CRM_USB_DIV_1);
            break;

            /* 72MHz */
            case 72000000:
                crm_usb_clock_div_set(CRM_USB_DIV_1_5);
            break;

            /* 96MHz */
            case 96000000:
                crm_usb_clock_div_set(CRM_USB_DIV_2);
            break;

            /* 120MHz */
            case 120000000:
                crm_usb_clock_div_set(CRM_USB_DIV_2_5);
            break;

            /* 144MHz */
            case 144000000:
                crm_usb_clock_div_set(CRM_USB_DIV_3);
            break;

            /* 168MHz */
            case 168000000:
                crm_usb_clock_div_set(CRM_USB_DIV_3_5);
            break;

            /* 192MHz */
            case 192000000:
                crm_usb_clock_div_set(CRM_USB_DIV_4);
            break;

            default: break;

        }
    }
}