// ******************************************************************************************
//   Project      :  STM32VLDISCOVERY Sample Program (STM32F100RB)
//   Program Name :
//   Programer    :
//   Create date  :  Version 1.0    H24.10.01
//   History      :
//   Laungage     :  Atollic TrueSTDIO C Launguage
// ******************************************************************************************
//   Description
//         On board LED : PC8, PC9
//
// ******************************************************************************************
#include <stddef.h>
#include "stm32f10x.h"

void wait(void);

int main(void)
{
    unsigned int LEDlst=0;

// *******************
//  1.Initialize
// *******************
// (1)Define APB2(peripheral clock enable register)
    RCC->APB2ENR = 0x000C;    // APB2ENR[2-3]:IOPAEN,IOPBEN   I/O port A,B clock enable
                              // Set and cleared by software. 0: I/O portn clock disabled, 1:I/O portn clock enabled
// (2)Define I/O Port A
    GPIOA->CRL  = 0x11111111; // Port configuration register low (GPIOn[0-7])
    GPIOA->CRH  = 0x11111111; // Port configuration register high(GPIOn[8-15])
                              //      CNF=00: General purpose output push-pull, MODE=01:Output mode, max speed 10 MHz
//  GPIOA->IDR                // Port input data register (Read Only)   IDR[31-16]:Reserved,�@IDR[15-0]:Port output data
    GPIOA->ODR  = 0x00000000; // Port output data register   ODR[31-16]:Reserved,�@ODR[15-0]:Port output data
//  GPIOA->BSRR               // Port bit set/reset registe
//  GPIOA->BRR                // Port bit reset register
//  GPIOA->LCKR               // Port configuration lock register

// (3)Define I/O Port B
    GPIOB->CRL  = 0x11111111; // Port configuration register low (GPIOn[0-7])
    GPIOB->CRH  = 0x11111111; // Port configuration register high(GPIOn[8-15])
                              //      CNF=00: General purpose output push-pull, MODE=01:Output mode, max speed 10 MHz
//  GPIOB->IDR                // Port input data register (Read Only)   IDR[31-16]:Reserved,�@IDR[15-0]:Port output data
    GPIOB->ODR  = 0x00000000; // Port output data register   ODR[31-16]:Reserved,�@ODR[15-0]:Port output data
//  GPIOB->BSRR               // Port bit set/reset registe
//  GPIOB->BRR                // Port bit reset register
//  GPIOB->LCKR               // Port configuration lock register

// *******************
//  2.Program main
// *******************
    LEDlst = 1;
    while(1){
        if(LEDlst == 1){
            LEDlst = 2;
        }else if(LEDlst > 127){
            LEDlst = 1;
        }else{
            LEDlst = LEDlst * 2;
        }

        GPIOA->ODR = LEDlst | (LEDlst << 8);
        GPIOB->ODR = LEDlst | (LEDlst << 8);

        wait();
    }
}

//****************************************************************************
//   Function Name : wait
//   Title         :
//   Input         :
//   Output        :
//   Description   :
//****************************************************************************
void wait()
{
unsigned int lp,lp1;
    for(lp=0;lp<2000;lp++)
        for(lp1=0;lp1<100;lp1++){};
}