static void
sys_reset(void)
{
copy_initialized();
clear_bss();
enable_fault_exceptions();
start_hse_clock();
use_pll();
main();
while(1);
}
void _init()
{
#ifndef NO_INIT
use_default_clocks();
use_pll(0, 0, 1, 31, 1);
uart_init(115200);
rt_kprintf("core freq at %ld Hz\n", get_cpu_freq());
write_csr(mtvec, &trap_entry);
if (read_csr(misa) & (1 << ('F' - 'A'))) { // if F extension is present
write_csr(mstatus, MSTATUS_FS); // allow FPU instructions without trapping
write_csr(fcsr, 0); // initialize rounding mode, undefined at reset
}
#endif
}
static void
sys_reset(void)
{
unsigned int volatile *d;
d = dummy;
/* turn on the internal oscillator */
RCC->CR |= RCC_CR_HSION;
/* turn off the external oscillator, the clock security system, and the PLL */
RCC->CR &= (uint32_t)0xFEF6FFFF;
/* disable and clear any pending interrupts */
RCC->CIR =
RCC_CIR_LSIRDYC |
RCC_CIR_LSERDYC |
RCC_CIR_HSIRDYC |
RCC_CIR_HSERDYC |
RCC_CIR_PLLRDYC |
RCC_CIR_CSSC;
/* turn on the flash pre-fetch buffer and set its wait state to 2 */
FLASH->ACR |= FLASH_ACR_PRFTBE;
FLASH->ACR = (FLASH->ACR & ~FLASH_ACR_LATENCY) | FLASH_ACR_LATENCY_2;
copy_initialized();
clear_bss();
enable_fault_exceptions();
clock_config();
start_hse_clock();
flash_config();
use_pll();
main();
while(1);
}
