void Chip_USB_Init(void)
{
/* Set USB PLL input to main oscillator */
Chip_Clock_SetUSBPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
/* Setup USB PLL (FCLKIN = 12MHz) * 4 = 48MHz
MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2)
FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz
FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */
Chip_Clock_SetupUSBPLL(3, 1);
/* Powerup USB PLL */
Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPLL_PD);
/* Wait for PLL to lock */
while (!Chip_Clock_IsUSBPLLLocked()) {}
/* enable USB main clock */
Chip_Clock_SetUSBClockSource(SYSCTL_USBCLKSRC_PLLOUT, 1);
/* Enable AHB clock to the USB block. */
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USB);
/* power UP USB Phy */
Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPHY_PD);
/* Reset USB block */
Chip_SYSCTL_PeriphReset(RESET_USB);
}
/* Initialize pin and clocks for USB0/USB1 port */
static void usb_pin_clk_init(void) {
/* enable USB main clock */
Chip_Clock_SetUSBClockSource(SYSCTL_USBCLKSRC_PLLOUT, 1);
/* Enable AHB clock to the USB block and USB RAM. */
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USB);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USBRAM);
/* power UP USB Phy */
Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPAD_PD);
}
static void usb_pin_clk_init(void)
{
/* enable USB main clock */
Chip_Clock_SetUSBClockSource(SYSCTL_USBCLKSRC_PLLOUT, 1);
/* Enable AHB clock to the USB block and USB RAM. */
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USB);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USBRAM);
/* power UP USB Phy */
Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPAD_PD);
/* Enable IOCON clock */
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 3, (IOCON_FUNC1 | IOCON_MODE_INACT)); /* PIO0_3 used for USB_VBUS */
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 6, (IOCON_FUNC1 | IOCON_MODE_INACT)); /* PIO0_6 used for USB_CONNECT */
}
