#include "stm32g4xx_hal.h"
#include "boot_port.h"
#include "usb_cdc.h"
static volatile uint32_t clock_fault;
void SysTick_Handler(void) { HAL_IncTick(); }
static void fatal(uint32_t code) { clock_fault = code; for (;;) {} }
static void usb_clock_init(void)
{
    RCC_OscInitTypeDef osc = {0};
    RCC_PeriphCLKInitTypeDef peripheral = {0};
    RCC_CRSInitTypeDef crs = {0};
    /* CPU stays on reset HSI16. USB uses HSI48 disciplined by USB SOF. */
    osc.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
    osc.HSI48State = RCC_HSI48_ON;
    if (HAL_RCC_OscConfig(&osc) != HAL_OK) fatal(2);
    peripheral.PeriphClockSelection = RCC_PERIPHCLK_USB;
    peripheral.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
    if (HAL_RCCEx_PeriphCLKConfig(&peripheral) != HAL_OK) fatal(3);
    __HAL_RCC_CRS_CLK_ENABLE();
    crs.Prescaler = RCC_CRS_SYNC_DIV1;
    crs.Source = RCC_CRS_SYNC_SOURCE_USB;
    crs.Polarity = RCC_CRS_SYNC_POLARITY_RISING;
    crs.ReloadValue = __HAL_RCC_CRS_RELOADVALUE_CALCULATE(48000000U, 1000U);
    crs.ErrorLimitValue = RCC_CRS_ERRORLIMIT_DEFAULT;
    crs.HSI48CalibrationValue = RCC_CRS_HSI48CALIBRATION_DEFAULT;
    HAL_RCCEx_CRSConfig(&crs);
}
void boot_protocol_init(void);
void boot_protocol_poll(uint32_t now);
int main(void)
{
    bool requested;
    SCB->VTOR = FLASH_BASE;
    requested = g474_boot_requested();
    if (!requested && g474_app_valid()) g474_jump_app();
    if (HAL_Init() != HAL_OK) fatal(1);
    usb_clock_init(); boot_protocol_init(); usb_cdc_init();
    for (;;) { uint32_t now = HAL_GetTick(); usb_cdc_poll(now); boot_protocol_poll(now); }
}