3de856f8d5
* FuriHal: add bus abstraction and port some subsystem to it * Make PVS happy, cleanup code * Update API symbols for f18 * F18: backport bus changes from f7 * Revert to STOP2 sleep mode * Fix downgrading the firmware via updater * Port iButton TIM1 to furi_hal_bus * Port Infrared TIM1 and TIM2 to furi_hal_bus * Just enable the timer bus * Port furi_hal_pwm to bus API * Fix include statement * Port furi_hal_rfid to bus API * Port furi_hal_subghz and others to bus API * Remove unneeded include * Improve furi_hal_infrared defines * Reset LPTIM1 via furi_hal_bus API * Crash when trying to enable an already enabled peripheral * Better defines * Improved checks * Lots of macro wrappers * Copy spi changes for f18 * Fix crashes in LFRFID system * Fix crashes in NFC system * Improve comments * Create FuriHalBus.md * Update FuriHalBus.md * Fix crash when launching updater * Documentation: couple small fixes in FuriHalBus * FuriHal: fix copypaste in furi_hal_rfid_tim_reset * FuriHal: reset radio core related peripherals on restart * FuriHalBus: is enabled routine and bug fix for uart * RFID HAL: accomodate furi hal bus Co-authored-by: Georgii Surkov <georgii.surkov@outlook.com> Co-authored-by: Georgii Surkov <37121527+gsurkov@users.noreply.github.com> Co-authored-by: SG <who.just.the.doctor@gmail.com>
5.7 KiB
Using FuriHalBus API
Basic info
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. Some crucial peripherals are enabled right away by the system, others must be explicitly enabled by the user code.
NOTE: Here and afterwards the word "system" refers to any code belonging to the operating system, hardware drivers or built-in applications.
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.
To DISABLE a peripheral, call furi_hal_bus_disable(). Likewise, the peripheral in question MUST be enabled, otherwise a crash will occur.
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.
Peripherals
Built-in peripherals are divided into three categories:
- Enabled by the system on startup, never disabled;
- Enabled and disabled by the system on demand;
- Enabled and disabled by the user code.
Always-on peripherals
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.
Table 1 - Peripherals enabled by the system
| Peripheral | Enabled at |
|---|---|
| DMA1 | furi_hal_dma.c |
| DMA2 | -- |
| DMAMUX | -- |
| GPIOA | furi_hal_resources.c |
| GPIOB | -- |
| GPIOC | -- |
| GPIOD | -- |
| GPIOE | -- |
| GPIOH | -- |
| PKA | furi_hal_bt.c |
| AES2 | -- |
| HSEM | -- |
| IPCC | -- |
| FLASH | enabled by hardware |
On-demand system peripherals
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.
When not using the API, these peripherals MUST be enabled by the user code and then disabled when not needed anymore.
Table 2 - Peripherals enabled and disabled by the system
| Peripheral | API header file |
|---|---|
| RNG | furi_hal_random.h |
| SPI1 | furi_hal_spi.h |
| SPI2 | -- |
| I2C1 | furi_hal_i2c.h |
| I2C3 | -- |
| USART1 | furi_hal_uart.h |
| LPUART1 | -- |
| USB | furi_hal_usb.h |
On-demand shared peripherals
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.
Note that some of these peripherals may also be used by the system to implement its certain features. The system will take over any given peripheral only when the respective feature is in use.
Table 3 - Peripherals enabled and disabled by user
| Peripheral | System | Purpose |
|---|---|---|
| CRC | ||
| TSC | ||
| ADC | ||
| QUADSPI | ||
| TIM1 | yes | subghz, lfrfid, nfc, infrared, etc... |
| TIM2 | yes | -- |
| TIM16 | yes | speaker |
| TIM17 | ||
| LPTIM1 | yes | tickless idle timer |
| LPTIM2 | yes | pwm |
| SAI1 | ||
| LCD |
DMA
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.
Below is the list of DMA channels and their usage by the system.
Table 4 - DMA channels
| DMA | Channel | System | Purpose |
|---|---|---|---|
| DMA1 | 1 | yes | digital signal |
| -- | 2 | yes | -- |
| -- | 3 | ||
| -- | 4 | yes | pulse reader |
| -- | 5 | ||
| -- | 6 | ||
| -- | 7 | ||
| DMA2 | 1 | yes | infrared, lfrfid, subghz |
| -- | 2 | yes | -- |
| -- | 3 | yes | SPI |
| -- | 4 | yes | SPI |
| -- | 5 | ||
| -- | 6 | ||
| -- | 7 |