Chip-specific system clock management functions. More...
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Macros | |
Configuration Symbols | |
| #define | CONFIG_SYSCLK_SOURCE SYSCLK_SRC_MAINCK_4M_RC |
| Initial/static main system clock source. More... | |
| #define | CONFIG_SYSCLK_PRES 0 |
| Initial CPU clock divider (mck) More... | |
Master Clock Sources (MCK) | |
| #define | SYSCLK_SRC_SLCK_RC 0 |
| Internal 32kHz RC oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_SLCK_XTAL 1 |
| External 32kHz crystal oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_SLCK_BYPASS 2 |
| External 32kHz bypass oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_MAINCK_4M_RC 3 |
| Internal 4MHz RC oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_MAINCK_8M_RC 4 |
| Internal 8MHz RC oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_MAINCK_12M_RC 5 |
| Internal 12MHz RC oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_MAINCK_XTAL 6 |
| External crystal oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_MAINCK_BYPASS 7 |
| External bypass oscillator as master source clock. More... | |
| #define | SYSCLK_SRC_PLLACK 8 |
| Use PLLACK as master source clock. More... | |
| #define | SYSCLK_SRC_UPLLCK 9 |
| Use UPLLCK as master source clock. More... | |
Master Clock Prescalers (MCK) | |
| #define | SYSCLK_PRES_1 PMC_MCKR_PRES_CLK_1 |
| Set master clock prescaler to 1. More... | |
| #define | SYSCLK_PRES_2 PMC_MCKR_PRES_CLK_2 |
| Set master clock prescaler to 2. More... | |
| #define | SYSCLK_PRES_4 PMC_MCKR_PRES_CLK_4 |
| Set master clock prescaler to 4. More... | |
| #define | SYSCLK_PRES_8 PMC_MCKR_PRES_CLK_8 |
| Set master clock prescaler to 8. More... | |
| #define | SYSCLK_PRES_16 PMC_MCKR_PRES_CLK_16 |
| Set master clock prescaler to 16. More... | |
| #define | SYSCLK_PRES_32 PMC_MCKR_PRES_CLK_32 |
| Set master clock prescaler to 32. More... | |
| #define | SYSCLK_PRES_64 PMC_MCKR_PRES_CLK_64 |
| Set master clock prescaler to 64. More... | |
| #define | SYSCLK_PRES_3 PMC_MCKR_PRES_CLK_3 |
| Set master clock prescaler to 3. More... | |
Master Clock Division (MCK) | |
| #define | SYSCLK_DIV_1 PMC_MCKR_MDIV_EQ_PCK |
| Set master clock division to 1. More... | |
| #define | SYSCLK_DIV_2 PMC_MCKR_MDIV_PCK_DIV2 |
| Set master clock division to 2. More... | |
| #define | SYSCLK_DIV_4 PMC_MCKR_MDIV_PCK_DIV4 |
| Set master clock division to 4. More... | |
| #define | SYSCLK_DIV_3 PMC_MCKR_MDIV_PCK_DIV3 |
| Set master clock division to 3. More... | |
USB Clock Sources | |
| #define | USBCLK_SRC_PLL0 0 |
| Use PLLA. More... | |
| #define | USBCLK_SRC_UPLL 1 |
| Use UPLL. More... | |
Functions | |
| void | sysclk_disable_usb (void) |
| void | sysclk_enable_usb (void) |
Querying the system clock | |
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. More... | |
| static uint32_t | sysclk_get_cpu_hz (void) |
| Return the current rate in Hz of the CPU clock. More... | |
| static uint32_t | sysclk_get_peripheral_hz (void) |
| Retrieves the current rate in Hz of the peripheral clocks. More... | |
| static uint32_t | sysclk_get_peripheral_bus_hz (const volatile void *module) |
| Retrieves the current rate in Hz of the Peripheral Bus clock attached to the specified peripheral. More... | |
Enabling and disabling synchronous clocks | |
| static void | sysclk_enable_peripheral_clock (uint32_t ul_id) |
| Enable a peripheral's clock. More... | |
| static void | sysclk_disable_peripheral_clock (uint32_t ul_id) |
| Disable a peripheral's clock. More... | |
System Clock Source and Prescaler configuration | |
| void | sysclk_set_prescalers (uint32_t ul_pres) |
| Set system clock prescaler configuration. More... | |
| void | sysclk_set_source (uint32_t ul_src) |
| Change the source of the main system clock. More... | |
System Clock Initialization | |
| void | sysclk_init (void) |
| Initialize the synchronous clock system. More... | |
Detailed Description
Chip-specific system clock management functions.
Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
Definition in file same70/sysclk.h.