unleashed-firmware/firmware/targets/f7/furi-hal/furi-hal-spi.c

#include "furi-hal-spi.h"
#include "furi-hal-resources.h"

#include <stdbool.h>
#include <string.h>
#include <furi.h>

#include <stm32wbxx_ll_spi.h>
#include <stm32wbxx_ll_utils.h>
#include <stm32wbxx_ll_cortex.h>

#define TAG "FuriHalSpi"

void furi_hal_spi_init() {
    furi_hal_spi_bus_init(&furi_hal_spi_bus_r);
    furi_hal_spi_bus_init(&furi_hal_spi_bus_d);

    furi_hal_spi_bus_handle_init(&furi_hal_spi_bus_handle_subghz);
    furi_hal_spi_bus_handle_init(&furi_hal_spi_bus_handle_nfc);
    furi_hal_spi_bus_handle_init(&furi_hal_spi_bus_handle_display);
    furi_hal_spi_bus_handle_init(&furi_hal_spi_bus_handle_sd_fast);
    furi_hal_spi_bus_handle_init(&furi_hal_spi_bus_handle_sd_slow);

    FURI_LOG_I(TAG, "Init OK");
}

void furi_hal_spi_bus_init(FuriHalSpiBus* bus) {
    furi_assert(bus);
    bus->callback(bus, FuriHalSpiBusEventInit);
}

void furi_hal_spi_bus_deinit(FuriHalSpiBus* bus) {
    furi_assert(bus);
    bus->callback(bus, FuriHalSpiBusEventDeinit);
}

void furi_hal_spi_bus_handle_init(FuriHalSpiBusHandle* handle) {
    furi_assert(handle);
    handle->callback(handle, FuriHalSpiBusHandleEventInit);
}

void furi_hal_spi_bus_handle_deinit(FuriHalSpiBusHandle* handle) {
    furi_assert(handle);
    handle->callback(handle, FuriHalSpiBusHandleEventDeinit);
}

void furi_hal_spi_acquire(FuriHalSpiBusHandle* handle) {
    furi_assert(handle);

    handle->bus->callback(handle->bus, FuriHalSpiBusEventLock);
    handle->bus->callback(handle->bus, FuriHalSpiBusEventActivate);

    furi_assert(handle->bus->current_handle == NULL);

    handle->bus->current_handle = handle;
    handle->callback(handle, FuriHalSpiBusHandleEventActivate);
}

void furi_hal_spi_release(FuriHalSpiBusHandle* handle) {
    furi_assert(handle);
    furi_assert(handle->bus->current_handle == handle);

    // Handle event and unset handle
    handle->callback(handle, FuriHalSpiBusHandleEventDeactivate);
    handle->bus->current_handle = NULL;

    // Bus events
    handle->bus->callback(handle->bus, FuriHalSpiBusEventDeactivate);
    handle->bus->callback(handle->bus, FuriHalSpiBusEventUnlock);
}

static void furi_hal_spi_bus_end_txrx(FuriHalSpiBusHandle* handle, uint32_t timeout) {
    while(LL_SPI_GetTxFIFOLevel(handle->bus->spi) != LL_SPI_TX_FIFO_EMPTY);
    while(LL_SPI_IsActiveFlag_BSY(handle->bus->spi));
    while(LL_SPI_GetRxFIFOLevel(handle->bus->spi) != LL_SPI_RX_FIFO_EMPTY) {
        LL_SPI_ReceiveData8(handle->bus->spi);
    }
}

bool furi_hal_spi_bus_rx(FuriHalSpiBusHandle* handle, uint8_t* buffer, size_t size, uint32_t timeout) {
    furi_assert(handle);
    furi_assert(handle->bus->current_handle == handle);
    furi_assert(buffer);
    furi_assert(size > 0);

    return furi_hal_spi_bus_trx(handle, buffer, buffer, size, timeout);
}

bool furi_hal_spi_bus_tx(FuriHalSpiBusHandle* handle, uint8_t* buffer, size_t size, uint32_t timeout) {
    furi_assert(handle);
    furi_assert(handle->bus->current_handle == handle);
    furi_assert(buffer);
    furi_assert(size > 0);
    bool ret = true;

    while(size > 0) {
        if (LL_SPI_IsActiveFlag_TXE(handle->bus->spi)) {
            LL_SPI_TransmitData8(handle->bus->spi, *buffer);
            buffer++;
            size--;
        }
    }

    furi_hal_spi_bus_end_txrx(handle, timeout);
    LL_SPI_ClearFlag_OVR(handle->bus->spi);

    return ret;
}

bool furi_hal_spi_bus_trx(FuriHalSpiBusHandle* handle, uint8_t* tx_buffer, uint8_t* rx_buffer, size_t size, uint32_t timeout) {
    furi_assert(handle);
    furi_assert(handle->bus->current_handle == handle);
    furi_assert(tx_buffer);
    furi_assert(rx_buffer);
    furi_assert(size > 0);

    bool ret = true;
    size_t tx_size = size;
    bool tx_allowed = true;

    while(size > 0) {
        if(tx_size > 0 && LL_SPI_IsActiveFlag_TXE(handle->bus->spi) && tx_allowed) {
            LL_SPI_TransmitData8(handle->bus->spi, *tx_buffer);
            tx_buffer++;
            tx_size--;
            tx_allowed = false;
        }
        
        if(LL_SPI_IsActiveFlag_RXNE(handle->bus->spi)) {
            *rx_buffer = LL_SPI_ReceiveData8(handle->bus->spi);
            rx_buffer++;
            size--;
            tx_allowed = true;
        }
    }

    furi_hal_spi_bus_end_txrx(handle, timeout);

    return ret;
}