Chip-specific system clock management functions. More...
#include <compiler.h>#include <clk/pll.h>#include <regs/xmega_pr.h>#include <regs/xmega_clk.h>#include <stdint.h>#include <stdbool.h>#include <assert.h>#include <chip/memory-map.h>#include <io.h>Go to the source code of this file.
Defines | |
System Clock Sources | |
| #define | SYSCLK_SRC_RC2MHZ 0x00 |
| #define | SYSCLK_SRC_RC32MHZ 0x01 |
| #define | SYSCLK_SRC_RC32KHZ 0x02 |
| #define | SYSCLK_SRC_XOSC 0x03 |
| #define | SYSCLK_SRC_PLL 0x04 |
System Clock Port Numbers | |
| #define | SYSCLK_PORT_GEN XMEGA_PR_PRGEN |
| No particular port. | |
| #define | SYSCLK_PORT_A XMEGA_PR_PRPA |
| Devices on PORTA. | |
| #define | SYSCLK_PORT_B XMEGA_PR_PRPB |
| Devices on PORTB. | |
| #define | SYSCLK_PORT_C XMEGA_PR_PRPC |
| Devices on PORTC. | |
| #define | SYSCLK_PORT_D XMEGA_PR_PRPD |
| Devices on PORTD. | |
| #define | SYSCLK_PORT_E XMEGA_PR_PRPE |
| Devices on PORTE. | |
| #define | SYSCLK_PORT_F XMEGA_PR_PRPF |
| Devices on PORTF. | |
Clocks not associated with any port | |
| #define | SYSCLK_DMA (1U << PR_DMA_BIT) |
| DMA Controller. | |
| #define | SYSCLK_EVSYS (1U << PR_EVSYS_BIT) |
| Event System. | |
| #define | SYSCLK_RTC (1U << PR_RTC_BIT) |
| Real-Time Counter. | |
| #define | SYSCLK_EBI (1U << PR_EBI_BIT) |
| Ext Bus Interface. | |
| #define | SYSCLK_AES (1U << PR_AES_BIT) |
| AES Module. | |
Clocks on PORTA and PORTB | |
| #define | SYSCLK_AC (1U << PR_AC_BIT) |
| Analog Comparator. | |
| #define | SYSCLK_ADC (1U << PR_ADC_BIT) |
| A/D Converter. | |
| #define | SYSCLK_DAC (1U << PR_DAC_BIT) |
| D/A Converter. | |
Clocks on PORTC, PORTD, PORTE and PORTF | |
| #define | SYSCLK_TC0 (1U << PR_TC0_BIT) |
| Timer/Counter 0. | |
| #define | SYSCLK_TC1 (1U << PR_TC1_BIT) |
| Timer/Counter 1. | |
| #define | SYSCLK_HIRES (1U << PR_HIRES_BIT) |
| Hi-Res Extension. | |
| #define | SYSCLK_SPI (1U << PR_SPI_BIT) |
| SPI controller. | |
| #define | SYSCLK_USART0 (1U << PR_USART0_BIT) |
| USART 0. | |
| #define | SYSCLK_USART1 (1U << PR_USART1_BIT) |
| USART 1. | |
| #define | SYSCLK_TWI (1U << PR_TWI_BIT) |
| TWI controller. | |
Functions | |
| static __always_inline bool | sysclk_module_is_enabled (uint8_t port, uint8_t id) |
| Check if the synchronous clock is enabled for a module. | |
Querying the system clock and its derived clocks | |
The following functions may be used to query the current frequency of the system clock and the CPU and bus clocks derived from it. sysclk_get_main_hz() and sysclk_get_cpu_hz() can be assumed to be available on all platforms, although some platforms may define additional accessors for various chip-internal bus clocks. These are usually not intended to be queried directly by generic code. | |
| static uint32_t | sysclk_get_main_hz (void) |
| Return the current rate in Hz of the main system clock. | |
| static uint32_t | sysclk_get_per4_hz (void) |
| Return the current rate in Hz of clk_PER4. | |
| static uint32_t | sysclk_get_per2_hz (void) |
| Return the current rate in Hz of clk_PER2. | |
| static uint32_t | sysclk_get_per_hz (void) |
| Return the current rate in Hz of clk_PER. | |
| static uint32_t | sysclk_get_cpu_hz (void) |
| Return the current rate in Hz of the CPU clock. | |
Enabling and disabling synchronous clocks | |
| void | sysclk_enable_module (uint8_t port, uint8_t id) |
| Enable the clock to peripheral id on port port. | |
| void | sysclk_disable_module (uint8_t port, uint8_t id) |
| Disable the clock to peripheral id on port port. | |
System Clock Initialization | |
| void | sysclk_init (void) |
| Initialize the synchronous clock system. | |
Chip-specific system clock management functions.
Copyright (C) 2009 - 2010 Atmel Corporation. All rights reserved.
Definition in file sysclk.h.
1.6.3