flipperzero-firmware/lib/ST25RFAL002/platform.c

#include "platform.h"
#include <assert.h>
#include <furi.h>
#include <furi_hal_spi.h>

static const osThreadAttr_t platform_irq_thread_attr = {
    .name = "RfalIrqDriver",
    .stack_size = 1024,
    .priority = osPriorityRealtime,
};

static volatile osThreadId_t platform_irq_thread_id = NULL;
static volatile PlatformIrqCallback platform_irq_callback = NULL;
static const GpioPin pin = {ST25R_INT_PORT, ST25R_INT_PIN};

void nfc_isr(void* _ctx) {
    UNUSED(_ctx);
    if(platform_irq_callback && platformGpioIsHigh(ST25R_INT_PORT, ST25R_INT_PIN)) {
        osThreadFlagsSet(platform_irq_thread_id, 0x1);
    }
}

void platformIrqThread() {
    while(1) {
        uint32_t flags = osThreadFlagsWait(0x1, osFlagsWaitAny, osWaitForever);
        if(flags & 0x1) {
            platform_irq_callback();
        }
    }
}

void platformEnableIrqCallback() {
    furi_hal_gpio_init(&pin, GpioModeInterruptRise, GpioPullDown, GpioSpeedLow);
    furi_hal_gpio_enable_int_callback(&pin);
}

void platformDisableIrqCallback() {
    furi_hal_gpio_init(&pin, GpioModeOutputOpenDrain, GpioPullNo, GpioSpeedLow);
    furi_hal_gpio_disable_int_callback(&pin);
}

void platformSetIrqCallback(PlatformIrqCallback callback) {
    platform_irq_callback = callback;
    platform_irq_thread_id = osThreadNew(platformIrqThread, NULL, &platform_irq_thread_attr);
    furi_hal_gpio_add_int_callback(&pin, nfc_isr, NULL);
    // Disable interrupt callback as the pin is shared between 2 apps
    // It is enabled in rfalLowPowerModeStop()
    furi_hal_gpio_disable_int_callback(&pin);
}

bool platformSpiTxRx(const uint8_t* txBuf, uint8_t* rxBuf, uint16_t len) {
    bool ret = false;
    if(txBuf && rxBuf) {
        ret =
            furi_hal_spi_bus_trx(&furi_hal_spi_bus_handle_nfc, (uint8_t*)txBuf, rxBuf, len, 1000);
    } else if(txBuf) {
        ret = furi_hal_spi_bus_tx(&furi_hal_spi_bus_handle_nfc, (uint8_t*)txBuf, len, 1000);
    } else if(rxBuf) {
        ret = furi_hal_spi_bus_rx(&furi_hal_spi_bus_handle_nfc, (uint8_t*)rxBuf, len, 1000);
    }

    return ret;
}

void platformProtectST25RComm() {
    furi_hal_spi_acquire(&furi_hal_spi_bus_handle_nfc);
}

void platformUnprotectST25RComm() {
    furi_hal_spi_release(&furi_hal_spi_bus_handle_nfc);
}