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

#include <furi-hal-i2c.h>

#include <stm32wbxx_ll_bus.h>
#include <stm32wbxx_ll_i2c.h>
#include <stm32wbxx_ll_rcc.h>
#include <stm32wbxx_ll_gpio.h>
#include <stm32wbxx_ll_cortex.h>

void furi_hal_i2c_init() {
    LL_I2C_InitTypeDef I2C_InitStruct = {0};
    LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

    LL_RCC_SetI2CClockSource(LL_RCC_I2C1_CLKSOURCE_PCLK1);

    LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
    GPIO_InitStruct.Pin = POWER_I2C_SCL_Pin | POWER_I2C_SDA_Pin;
    GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
    GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
    GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
    LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C1);

    I2C_InitStruct.PeripheralMode = LL_I2C_MODE_I2C;
    I2C_InitStruct.Timing = POWER_I2C_TIMINGS;
    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;
    LL_I2C_Init(I2C1, &I2C_InitStruct);
    LL_I2C_EnableAutoEndMode(I2C1);
    LL_I2C_SetOwnAddress2(I2C1, 0, LL_I2C_OWNADDRESS2_NOMASK);
    LL_I2C_DisableOwnAddress2(I2C1);
    LL_I2C_DisableGeneralCall(I2C1);
    LL_I2C_EnableClockStretching(I2C1);
}

bool furi_hal_i2c_tx(
    I2C_TypeDef* instance,
    uint8_t address,
    const uint8_t* data,
    uint8_t size,
    uint32_t timeout) {
    uint32_t time_left = timeout;
    bool ret = true;

    while(LL_I2C_IsActiveFlag_BUSY(instance))
        ;

    LL_I2C_HandleTransfer(
        instance,
        address,
        LL_I2C_ADDRSLAVE_7BIT,
        size,
        LL_I2C_MODE_AUTOEND,
        LL_I2C_GENERATE_START_WRITE);

    while(!LL_I2C_IsActiveFlag_STOP(instance) || size > 0) {
        if(LL_I2C_IsActiveFlag_TXIS(instance)) {
            LL_I2C_TransmitData8(instance, (*data));
            data++;
            size--;
            time_left = timeout;
        }

        if(LL_SYSTICK_IsActiveCounterFlag()) {
            if(--time_left == 0) {
                ret = false;
                break;
            }
        }
    }

    LL_I2C_ClearFlag_STOP(instance);

    return ret;
}

bool furi_hal_i2c_rx(
    I2C_TypeDef* instance,
    uint8_t address,
    uint8_t* data,
    uint8_t size,
    uint32_t timeout) {
    uint32_t time_left = timeout;
    bool ret = true;

    while(LL_I2C_IsActiveFlag_BUSY(instance))
        ;

    LL_I2C_HandleTransfer(
        instance,
        address,
        LL_I2C_ADDRSLAVE_7BIT,
        size,
        LL_I2C_MODE_AUTOEND,
        LL_I2C_GENERATE_START_READ);

    while(!LL_I2C_IsActiveFlag_STOP(instance) || size > 0) {
        if(LL_I2C_IsActiveFlag_RXNE(instance)) {
            *data = LL_I2C_ReceiveData8(instance);
            data++;
            size--;
            time_left = timeout;
        }

        if(LL_SYSTICK_IsActiveCounterFlag()) {
            if(--time_left == 0) {
                ret = false;
                break;
            }
        }
    }

    LL_I2C_ClearFlag_STOP(instance);

    return ret;
}

bool furi_hal_i2c_trx(
    I2C_TypeDef* instance,
    uint8_t address,
    const uint8_t* tx_data,
    uint8_t tx_size,
    uint8_t* rx_data,
    uint8_t rx_size,
    uint32_t timeout) {
    if(furi_hal_i2c_tx(instance, address, tx_data, tx_size, timeout) &&
       furi_hal_i2c_rx(instance, address, rx_data, rx_size, timeout)) {
        return true;
    } else {
        return false;
    }
}