unleashed-firmware/firmware/targets/f7/furi-hal/furi-hal-i2c-config.c

#include "furi-hal-i2c-config.h"
#include <furi-hal-resources.h>
#include <furi-hal-version.h>

/** Timing register value is computed with the STM32CubeMX Tool,
  * Standard Mode @100kHz with I2CCLK = 64 MHz,
  * rise time = 0ns, fall time = 0ns
  */
#define FURI_HAL_I2C_CONFIG_POWER_I2C_TIMINGS_100 0x10707DBC

/** Timing register value is computed with the STM32CubeMX Tool,
  * Fast Mode @400kHz with I2CCLK = 64 MHz,
  * rise time = 0ns, fall time = 0ns
  */
#define FURI_HAL_I2C_CONFIG_POWER_I2C_TIMINGS_400 0x00602173

osMutexId_t furi_hal_i2c_bus_power_mutex = NULL;

static void furi_hal_i2c_bus_power_event(FuriHalI2cBus* bus, FuriHalI2cBusEvent event) {
    if (event == FuriHalI2cBusEventInit) {
        furi_hal_i2c_bus_power_mutex = osMutexNew(NULL);
        FURI_CRITICAL_ENTER();
        LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C1);
        LL_RCC_SetI2CClockSource(LL_RCC_I2C1_CLKSOURCE_PCLK1);
        LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
        FURI_CRITICAL_EXIT();
        bus->current_handle = NULL;
    } else if (event == FuriHalI2cBusEventDeinit) {
        osMutexDelete(furi_hal_i2c_bus_power_mutex);
    } else if (event == FuriHalI2cBusEventLock) {
        furi_check(osMutexAcquire(furi_hal_i2c_bus_power_mutex, osWaitForever) == osOK);
    } else if (event == FuriHalI2cBusEventUnlock) {
        furi_check(osMutexRelease(furi_hal_i2c_bus_power_mutex) == osOK);
    } else if (event == FuriHalI2cBusEventActivate) {
        FURI_CRITICAL_ENTER();
        LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
        FURI_CRITICAL_EXIT();
    } else if (event == FuriHalI2cBusEventDeactivate) {
        FURI_CRITICAL_ENTER();
        LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
        FURI_CRITICAL_EXIT();
    }
}

FuriHalI2cBus furi_hal_i2c_bus_power = {
    .i2c=I2C1,
    .callback=furi_hal_i2c_bus_power_event,
};

osMutexId_t furi_hal_i2c_bus_external_mutex = NULL;

static void furi_hal_i2c_bus_external_event(FuriHalI2cBus* bus, FuriHalI2cBusEvent event) {
    if (event == FuriHalI2cBusEventActivate) {
        FURI_CRITICAL_ENTER();
        LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C3);
        LL_RCC_SetI2CClockSource(LL_RCC_I2C3_CLKSOURCE_PCLK1);
        LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3);
        FURI_CRITICAL_EXIT();
    } else if (event == FuriHalI2cBusEventDeactivate) {
        FURI_CRITICAL_ENTER();
        LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3);
        FURI_CRITICAL_EXIT();
    }
}

FuriHalI2cBus furi_hal_i2c_bus_external = {
    .i2c=I2C3,
    .callback=furi_hal_i2c_bus_external_event,
};

void furi_hal_i2c_bus_handle_power_event(FuriHalI2cBusHandle* handle, FuriHalI2cBusHandleEvent event) {
    if (event == FuriHalI2cBusHandleEventActivate) {
        hal_gpio_init_ex(&gpio_i2c_power_sda, GpioModeAltFunctionOpenDrain, GpioPullNo, GpioSpeedLow, GpioAltFn4I2C1);
        hal_gpio_init_ex(&gpio_i2c_power_scl, GpioModeAltFunctionOpenDrain, GpioPullNo, GpioSpeedLow, GpioAltFn4I2C1);

        LL_I2C_InitTypeDef I2C_InitStruct = {0};
        I2C_InitStruct.PeripheralMode = LL_I2C_MODE_I2C;
        I2C_InitStruct.AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE;
        I2C_InitStruct.DigitalFilter = 0;
        I2C_InitStruct.OwnAddress1 = 0;
        I2C_InitStruct.TypeAcknowledge = LL_I2C_ACK;
        I2C_InitStruct.OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
        if (furi_hal_version_get_hw_version() > 10) {
            I2C_InitStruct.Timing = FURI_HAL_I2C_CONFIG_POWER_I2C_TIMINGS_400;
        } else {
            I2C_InitStruct.Timing = FURI_HAL_I2C_CONFIG_POWER_I2C_TIMINGS_100;
        }
        LL_I2C_Init(handle->bus->i2c, &I2C_InitStruct);
        // I2C is enabled at this point
        LL_I2C_EnableAutoEndMode(handle->bus->i2c);
        LL_I2C_SetOwnAddress2(handle->bus->i2c, 0, LL_I2C_OWNADDRESS2_NOMASK);
        LL_I2C_DisableOwnAddress2(handle->bus->i2c);
        LL_I2C_DisableGeneralCall(handle->bus->i2c);
        LL_I2C_EnableClockStretching(handle->bus->i2c);
    } else if (event == FuriHalI2cBusHandleEventDeactivate) {
        LL_I2C_Disable(handle->bus->i2c);
        hal_gpio_write(&gpio_i2c_power_sda, 1);
        hal_gpio_write(&gpio_i2c_power_scl, 1);
        hal_gpio_init_ex(&gpio_i2c_power_sda, GpioModeAnalog, GpioPullNo, GpioSpeedLow, GpioAltFnUnused);
        hal_gpio_init_ex(&gpio_i2c_power_scl, GpioModeAnalog, GpioPullNo, GpioSpeedLow, GpioAltFnUnused);
    }
}

FuriHalI2cBusHandle furi_hal_i2c_handle_power = {
    .bus = &furi_hal_i2c_bus_power,
    .callback = furi_hal_i2c_bus_handle_power_event,
};

void furi_hal_i2c_bus_handle_external_event(FuriHalI2cBusHandle* handle, FuriHalI2cBusHandleEvent event) {
    if (event == FuriHalI2cBusHandleEventActivate) {
        hal_gpio_init_ex(&gpio_ext_pc0, GpioModeAltFunctionOpenDrain, GpioPullNo, GpioSpeedLow, GpioAltFn4I2C3);
        hal_gpio_init_ex(&gpio_ext_pc1, GpioModeAltFunctionOpenDrain, GpioPullNo, GpioSpeedLow, GpioAltFn4I2C3);

        LL_I2C_InitTypeDef I2C_InitStruct = {0};
        I2C_InitStruct.PeripheralMode = LL_I2C_MODE_I2C;
        I2C_InitStruct.AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE;
        I2C_InitStruct.DigitalFilter = 0;
        I2C_InitStruct.OwnAddress1 = 0;
        I2C_InitStruct.TypeAcknowledge = LL_I2C_ACK;
        I2C_InitStruct.OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
        I2C_InitStruct.Timing = FURI_HAL_I2C_CONFIG_POWER_I2C_TIMINGS_100;
        LL_I2C_Init(handle->bus->i2c, &I2C_InitStruct);
        // I2C is enabled at this point
        LL_I2C_EnableAutoEndMode(handle->bus->i2c);
        LL_I2C_SetOwnAddress2(handle->bus->i2c, 0, LL_I2C_OWNADDRESS2_NOMASK);
        LL_I2C_DisableOwnAddress2(handle->bus->i2c);
        LL_I2C_DisableGeneralCall(handle->bus->i2c);
        LL_I2C_EnableClockStretching(handle->bus->i2c);
    } else if (event == FuriHalI2cBusHandleEventDeactivate) {
        LL_I2C_Disable(handle->bus->i2c);
        hal_gpio_write(&gpio_ext_pc0, 1);
        hal_gpio_write(&gpio_ext_pc1, 1);
        hal_gpio_init_ex(&gpio_ext_pc0, GpioModeAnalog, GpioPullNo, GpioSpeedLow, GpioAltFnUnused);
        hal_gpio_init_ex(&gpio_ext_pc1, GpioModeAnalog, GpioPullNo, GpioSpeedLow, GpioAltFnUnused);
    }
}

FuriHalI2cBusHandle furi_hal_i2c_handle_external = {
    .bus = &furi_hal_i2c_bus_external,
    .callback = furi_hal_i2c_bus_handle_external_event,
};