int main()
{
//Low level init: Clock and Interrupt controller
prvClockInit();
nvicInit();
initUsecTimer();
//Launch the system task that will initialize and start everything
systemLaunch();
//Start the FreeRTOS scheduler
vTaskStartScheduler();
//Should never reach this point!
while(1);
return 0;
}
/*****************************************************************************
Function : osTickStart
Description : Set system tick reqister, and start system tick exception
Note that This function is called by LOS_Start() In LiteOS kernel.
so, please don't init system tick before LiteOS kernel Inited
in your own system.
Input : None
Output : None
Return : LOS_OK
*****************************************************************************/
unsigned int osTickStart(void)
{
unsigned int uwRet = 0;
/* This code section LOS need, so don't change it */
g_ucycle_per_tick = sys_clk_freq / tick_per_second;
LOS_SetTickSycle(g_ucycle_per_tick);
/*
Set system tick relaod register valude, current register valude and start
system tick exception.
Note: here can be replaced by some function , for example in Stm32 bsp
you can just call SysTick_Config(sys_clk_freq/tick_per_second);
*/
#ifdef LOS_ADuCM450LF
prvClockInit();
SysTick_Config(g_ucycle_per_tick);
#else
*(volatile UINT32 *)OS_SYSTICK_RELOAD_REG = g_ucycle_per_tick - 1;
*((volatile UINT8 *)OS_NVIC_EXCPRI_BASE + (((UINT32)(-1) & 0xF) - 4)) = ((7 << 4) & 0xff);
*(volatile UINT32 *)OS_SYSTICK_CURRENT_REG = 0;
*(volatile UINT32 *)OS_SYSTICK_CONTROL_REG = (1 << 2) | (1 << 1) | (1 << 0);
#endif
return uwRet;
}
