firmware/src/platform/stm32wl/layer.c

#include "architecture.h"
#include "stm32wlxx.h"
#include "stm32wlxx_hal.h"
#include <stdbool.h>

void HardFault_Handler(void)
{
    asm("bkpt");
}

void stm32wl_emulate_digitalWrite(long unsigned int pin, long unsigned int value)
{
    switch (pin) {
    case SX126X_CS: /* active low */
        if (value)
            LL_PWR_UnselectSUBGHZSPI_NSS();
        else
            LL_PWR_SelectSUBGHZSPI_NSS();
        break;
    case SX126X_RESET: /* active low */
        if (value)
            LL_RCC_RF_DisableReset();
        else {
            LL_RCC_RF_EnableReset();
            LL_RCC_HSE_EnableTcxo();
            LL_RCC_HSE_Enable();
            while (!LL_RCC_HSE_IsReady())
                ;
        }
        break;
    default:
        asm("bkpt");
        break;
    }
}

static bool irq_happened;

void SUBGHZ_Radio_IRQHandler(void)
{
    NVIC_DisableIRQ(SUBGHZ_Radio_IRQn);
    irq_happened = true;
}

int stm32wl_emulate_digitalRead(long unsigned int pin)
{
    int outcome = 0;

    switch (pin) {
    case SX126X_BUSY:
        //            return ((LL_PWR_IsActiveFlag_RFBUSYMS() & LL_PWR_IsActiveFlag_RFBUSYS()) == 1UL);
        outcome = LL_PWR_IsActiveFlag_RFBUSYS();
        break;
    case SX126X_DIO1:
    default:
        NVIC_ClearPendingIRQ(SUBGHZ_Radio_IRQn);
        irq_happened = false;
        NVIC_EnableIRQ(SUBGHZ_Radio_IRQn);
        for (int i = 0; i < 64; i++)
            asm("nop");
        outcome = irq_happened;
        break;
    }
    return outcome;
}