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* SubGhz: add CC1101 Ext driver * SubGhz: move TIM2 -> TIM17 use cc1101_ext * FuriHal: SPI move channel DMA 3,4 -> 6.7 * Documentation: fix font * SubGhz: add work with SubGhz devices by link to device * SubGhz: add support switching external/internal cc1101 "subghz chat" * SubGhz: add support switching external/internal cc1101 "subghz tx" and "subghz rx" * SubGhz: add "Radio Settings" scene * SubGhz: add icon * SubGhz: add supported CC1101 external module in SubGhz app * SubGhz: fix check frequency supported radio device * SubGhz: fix clang-formatted * Sughz: move dirver CC1101_Ext to lib , compile cmd ./fbt launch_app APPSRC=radio_device_cc1101_ext * SubGhz: fix CLI * SubGhz: fix PVS * SubGhz: delete comments * SubGhz: fix unit_test * Format sources * Update api symbols and drivers targets * Drivers: find proper place for target option * SubGhz: external device connected method naming * Format sources * SubGhz: fix module selection menu, when external is not connected * SubGhz: fix furi_assert(device); * SubGhz: fix split h and c * SubGhz: furi_hal_subghz remove preset load function by name * SubGhz: deleted comments * Format Sources * SubGhz: add some consts and fix unit tests * Sync API Symbols Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
114 lines
5.7 KiB
Markdown
114 lines
5.7 KiB
Markdown
# Using FuriHalBus API
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## Basic info
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On system startup, most of the peripheral devices are under reset and not clocked by default. This is done to reduce power consumption and to guarantee that the device will always be in the same state before use.
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Some crucial peripherals are enabled right away by the system, others must be explicitly enabled by the user code.
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**NOTE:** Here and afterwards the word *"system"* refers to any code belonging to the operating system, hardware drivers or built-in applications.
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To **ENABLE** a peripheral, call `furi_hal_bus_enable()`. At the time of the call, the peripheral in question MUST be disabled, otherwise a crash will occur to indicate improper use. This means that any given peripheral cannot be enabled twice or more without disabling it first.
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To **DISABLE** a peripheral, call `furi_hal_bus_disable()`. Likewise, the peripheral in question MUST be enabled, otherwise a crash will occur.
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To **RESET** a peripheral, call `furi_hal_bus_reset()`. The peripheral in question MUST be enabled, otherwise a crash will occur. This method is used whenever it is necessary to reset all the peripheral's registers to their initial states without disabling it.
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## Peripherals
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Built-in peripherals are divided into three categories:
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- Enabled by the system on startup, never disabled;
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- Enabled and disabled by the system on demand;
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- Enabled and disabled by the user code.
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### Always-on peripherals
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Below is the list of peripherals that are enabled by the system. The user code must NEVER attempt to disable them. If a corresponding API is provided, the user code must employ it in order to access the peripheral.
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*Table 1* - Peripherals enabled by the system
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| Peripheral | Enabled at |
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| :-----------: | :-----------------------: |
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| DMA1 | `furi_hal_dma.c` |
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| DMA2 | -- |
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| DMAMUX | -- |
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| GPIOA | `furi_hal_resources.c` |
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| GPIOB | -- |
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| GPIOC | -- |
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| GPIOD | -- |
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| GPIOE | -- |
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| GPIOH | -- |
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| PKA | `furi_hal_bt.c` |
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| AES2 | -- |
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| HSEM | -- |
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| IPCC | -- |
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| FLASH | enabled by hardware |
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### On-demand system peripherals
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Below is the list of peripherals that are enabled and disabled by the system. The user code must avoid using them directly, preferring the respective APIs instead.
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When not using the API, these peripherals MUST be enabled by the user code and then disabled when not needed anymore.
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*Table 2* - Peripherals enabled and disabled by the system
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| Peripheral | API header file |
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| :-----------: | :-------------------: |
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| RNG | `furi_hal_random.h` |
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| SPI1 | `furi_hal_spi.h` |
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| SPI2 | -- |
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| I2C1 | `furi_hal_i2c.h` |
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| I2C3 | -- |
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| USART1 | `furi_hal_uart.h` |
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| LPUART1 | -- |
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| USB | `furi_hal_usb.h` |
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### On-demand shared peripherals
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Below is the list of peripherals that are not enabled by default and MUST be enabled by the user code each time it accesses them.
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Note that some of these peripherals may also be used by the system to implement its certain features.
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The system will take over any given peripheral only when the respective feature is in use.
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*Table 3* - Peripherals enabled and disabled by user
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| Peripheral | System | Purpose |
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| :-----------: | :-------: | ------------------------------------- |
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| CRC | | |
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| TSC | | |
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| ADC | | |
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| QUADSPI | | |
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| TIM1 | yes | subghz, lfrfid, nfc, infrared, etc... |
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| TIM2 | yes | subghz, infrared, etc... |
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| TIM16 | yes | speaker |
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| TIM17 | yes | cc1101_ext |
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| LPTIM1 | yes | tickless idle timer |
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| LPTIM2 | yes | pwm |
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| SAI1 | | |
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| LCD | | |
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## DMA
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The DMA1,2 peripherals are a special case in that they have multiple independent channels. Some of the channels may be in use by the system.
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Below is the list of DMA channels and their usage by the system.
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*Table 4* - DMA channels
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| DMA | Channel | System | Purpose |
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| :---: | :-------: | :-------: | ------------------------- |
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| DMA1 | 1 | yes | digital signal |
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| -- | 2 | yes | -- |
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| -- | 3 | | |
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| -- | 4 | yes | pulse reader |
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| -- | 5 | | |
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| -- | 6 | | |
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| -- | 7 | | |
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| DMA2 | 1 | yes | infrared, lfrfid, subghz, |
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| -- | 2 | yes | -- |
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| -- | 3 | yes | cc1101_ext |
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| -- | 4 | yes | cc1101_ext |
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| -- | 5 | yes | cc1101_ext |
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| -- | 6 | yes | SPI |
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| -- | 7 | yes | SPI |
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