本帖最后由 格式化/tp 于 2017-9-27 11:33 编辑

#include <stdio.h>
#include <stm32f10x.h>
#include <string.h>

// 延时n毫秒
void delay(uint16_t nms)
{
    TIM6->ARR = 10 * nms - 1;
    TIM6->PSC = 7199;
    TIM6->EGR = TIM_EGR_UG;
    TIM6->CR1 = TIM_CR1_OPM | TIM_CR1_CEN;
    while (TIM6->CR1 & TIM_CR1_CEN);
}

int fputc(int ch, FILE *fp)
{
    if (fp == stdout)
    {
        if (ch == ' ')
        {
            while ((USART1->SR & USART_SR_TXE) == 0);
            USART1->DR = ' ';
        }
        while ((USART1->SR & USART_SR_TXE) == 0);
        USART1->DR = ch;
    }
    return ch;
}

int main(void)
{
    char buf[20];
   
    RCC->AHBENR |= RCC_AHBENR_FSMCEN;
    RCC->APB1ENR = RCC_APB1ENR_TIM6EN;
    RCC->APB2ENR = RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPDEN | RCC_APB2ENR_IOPEEN | RCC_APB2ENR_USART1EN;
   
    GPIOA->CRH = 0x444444b3; // PA8为RST复位引脚(默认输出低电平), PA9为串口1发送引脚
    GPIOB->CRL = 0xb4444444; // PB7为NADV, 取反后送到AS引脚上, 该引脚不可用地址线代替!
    GPIOD->CRL = 0xb4bb44bb; // PD0~1为AD2~3, PD4为NOE接DS引脚, PD5为NWE接RW引脚, PD7为NE1片选引脚接CS
    GPIOD->CRH = 0xbb444444; // PD14~15为AD0~1
    GPIOE->CRL = 0xb4444444; // PE7为AD4
    GPIOE->CRH = 0x44444bbb; // PE8~10为AD5~7
   
    USART1->BRR = 625; // 串口波特率为115200
    USART1->CR1 = USART_CR1_UE | USART_CR1_TE; // 串口1只允许发送
   
    // FSMC的Bank1, Subbank1设为8位NOR Flash地址/数据线复用模式, 关闭NWAIT引脚
    FSMC_Bank1->BTCR[0] &= ~(FSMC_BCR1_WAITEN | FSMC_BCR1_MWID);
   
    // 下面为可选配置, 用于加快访存速度
    // HCLK=72MHz时, DATAST的最小值为2, 即3xHCLK clock cycles
    FSMC_Bank1->BTCR[1] = (FSMC_Bank1->BTCR[1] & ~(FSMC_BTR1_BUSTURN | FSMC_BTR1_DATAST | FSMC_BTR1_ADDHLD | FSMC_BTR1_ADDSET)) | FSMC_BTR1_DATAST_1 | FSMC_BTR1_ADDHLD_0;
   
    printf("STM32F103VE FSMC DS12C887 ");
    delay(200);
    GPIOA->BSRR = GPIO_BSRR_BS8; // RESET=1, 撤销复位信号
   
    // 读写自由SRAM区域
    strcpy((char *)0x60000033, "This is a string!");
    memcpy(buf, (char *)0x60000033, sizeof(buf));
    printf("str=%s ", buf);
   
    // 读A~D寄存器
    printf("A=0x%02x B=0x%02x C=0x%02x D=0x%02x ", *(__IO uint8_t *)0x6000000a, *(__IO uint8_t *)0x6000000b, *(__IO uint8_t *)0x6000000c, *(__IO uint8_t *)0x6000000d);
    while (1)
        __WFI();
}

void HardFault_Handler(void)
{
    printf("Hard Error! ");
    while (1);
}