Atmel Software Framework

conf_clock.h examples with USB support

Content of XMEGA conf_clock.h:

// Configuration based on internal RC:
// USB clock need of 48Mhz
#define CONFIG_USBCLK_SOURCE USBCLK_SRC_RCOSC
#define CONFIG_OSC_RC32_CAL 48000000UL
#define CONFIG_OSC_AUTOCAL_RC32MHZ_REF_OSC OSC_ID_USBSOF
// CPU clock need of clock > 12MHz to run with USB (Here 24MHz)
#define CONFIG_SYSCLK_SOURCE SYSCLK_SRC_RC32MHZ
#define CONFIG_SYSCLK_PSADIV SYSCLK_PSADIV_2
#define CONFIG_SYSCLK_PSBCDIV SYSCLK_PSBCDIV_1_1

Content of conf_clock.h for AT32UC3A0, AT32UC3A1, AT32UC3B devices (USBB):

// Configuration based on 12MHz external OSC:
#define CONFIG_PLL1_SOURCE PLL_SRC_OSC0
#define CONFIG_PLL1_MUL 8
#define CONFIG_PLL1_DIV 2
#define CONFIG_USBCLK_SOURCE USBCLK_SRC_PLL1
#define CONFIG_USBCLK_DIV 1 // Fusb = Fsys/(2 ^ USB_div)

Content of conf_clock.h for AT32UC3A3, AT32UC3A4 devices (USBB with high speed support):

// Configuration based on 12MHz external OSC:
#define CONFIG_USBCLK_SOURCE USBCLK_SRC_OSC0
#define CONFIG_USBCLK_DIV 1 // Fusb = Fsys/(2 ^ USB_div)

Content of conf_clock.h for AT32UC3C, ATUCXXD, ATUCXXL3U, ATUCXXL4U devices (USBC):

// Configuration based on 12MHz external OSC:
#define CONFIG_PLL1_SOURCE PLL_SRC_OSC0
#define CONFIG_PLL1_MUL 8
#define CONFIG_PLL1_DIV 2
#define CONFIG_USBCLK_SOURCE USBCLK_SRC_PLL1
#define CONFIG_USBCLK_DIV 1 // Fusb = Fsys/(2 ^ USB_div)
// CPU clock need of clock > 25MHz to run with USBC
#define CONFIG_SYSCLK_SOURCE SYSCLK_SRC_PLL1

Content of conf_clock.h for SAM3S, SAM3SD, SAM4S devices (UPD: USB Peripheral Device):

// PLL1 (B) Options (Fpll = (Fclk * PLL_mul) / PLL_div)
#define CONFIG_PLL1_SOURCE PLL_SRC_MAINCK_XTAL
#define CONFIG_PLL1_MUL 16
#define CONFIG_PLL1_DIV 2
// USB Clock Source Options (Fusb = FpllX / USB_div)
#define CONFIG_USBCLK_SOURCE USBCLK_SRC_PLL1
#define CONFIG_USBCLK_DIV 2

Content of conf_clock.h for SAM3U device (UPDHS: USB Peripheral Device High Speed):

// USB Clock Source fixed at UPLL.

Content of conf_clock.h for SAM3X, SAM3A devices (UOTGHS: USB OTG High Speed):

// USB Clock Source fixed at UPLL.
#define CONFIG_USBCLK_SOURCE USBCLK_SRC_UPLL
#define CONFIG_USBCLK_DIV 1

Content of conf_clocks.h for SAMD devices (USB):

// System clock bus configuration
# define CONF_CLOCK_FLASH_WAIT_STATES 2
// USB Clock Source fixed at DFLL.
// SYSTEM_CLOCK_SOURCE_DFLL configuration - Digital Frequency Locked Loop
# define CONF_CLOCK_DFLL_ENABLE true
# define CONF_CLOCK_DFLL_LOOP_MODE SYSTEM_CLOCK_DFLL_LOOP_MODE_USB_RECOVERY
# define CONF_CLOCK_DFLL_ON_DEMAND true
// Set this to true to configure the GCLK when running clocks_init.
// If set to false, none of the GCLK generators will be configured in clocks_init().
# define CONF_CLOCK_CONFIGURE_GCLK true
// Configure GCLK generator 0 (Main Clock)
# define CONF_CLOCK_GCLK_0_ENABLE true
# define CONF_CLOCK_GCLK_0_RUN_IN_STANDBY true
# define CONF_CLOCK_GCLK_0_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_DFLL
# define CONF_CLOCK_GCLK_0_PRESCALER 1
# define CONF_CLOCK_GCLK_0_OUTPUT_ENABLE false