MDK printf不显示

frc1 · 发表于 2016-7-31 19:07:50

本帖最后由 frc1 于 2016-8-1 11:39 编辑

下面是程序代码，大家能帮我看看哪里出问题了么
#include "stm32f10x.h"
#include <stdio.h>
#include "stm32f10x_GPIO.h"
#include "stm32f10x_RCC.h"
#include "stm32f10x_tim.h"

#define ITM_Port8(n) (*((volatile unsigned char *)(0xE0000000+4*n)))
#define ITM_Port16(n) (*((volatile unsigned short*)(0xE0000000+4*n)))
#define ITM_Port32(n) (*((volatile unsigned long *)(0xE0000000+4*n)))
#define DEMCR       (*((volatile unsigned long *)(0xE000EDFC)))
#define TRCENA    0x01000000
struct __FILE { int handle; /* Add whatever is needed */ };
FILE __stdout;
FILE __stdin;
int fputc(int ch, FILE *f)
{
  if (DEMCR & TRCENA)
  {
while (ITM_Port32(0) == 0);
ITM_Port8(0) = ch;
  }
  return(ch);
}

unsigned int CountOfToggle=0;

void LED0_Config(void);
void LED0_On(void);
void LED0_Off(void);
void TIM2_Delay500MS(void);

int main(void)
{
  LED0_Config();
  while (1)
  {
LED0_On();
      TIM2_Delay500MS();
LED0_Off();
      TIM2_Delay500MS();
CountOfToggle++;
printf("The Count of Toggle is %d\n",CountOfToggle);
  }
}

void LED0_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
  /* Enable GPIO_LED0 clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  /* GPIO_LED0 Pin(PA8) Configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void LED0_On(void)
{
  GPIO_ResetBits(GPIOA, GPIO_Pin_8);
}

void LED0_Off(void)
{
  GPIO_SetBits(GPIOA, GPIO_Pin_8);
}

void TIM2_Delay500MS()
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  /* Enable TIM2 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  /*  TIM2 Time Base Configuration:
   TIM2CLK / (( TIM_Prescaler + 1 ) * ( TIM_Period + 1 )) = TIM2 Frequency
      TIM2CLK = 72MHz, TIM2 Frequency = 2Hz,
      TIM_Prescaler = 36000-1, (TIM2 Counter Clock = 2kHz), TIM_Period = 1000-1       */
  TIM_TimeBaseStructure.TIM_Prescaler = 36000-1;
  TIM_TimeBaseStructure.TIM_Period = 1000-1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  /* Clear TIM2 update pending flag */
  TIM_ClearFlag(TIM2, TIM_FLAG_Update);
  /* Enable TIM2 counter */
  TIM_Cmd(TIM2,ENABLE);
  while (TIM_GetFlagStatus(TIM2, TIM_FLAG_Update) == RESET);
}

正点原子 · 发表于 2016-7-31 19:07:51

frc1 发表于 2016-8-3 12:18
我已经连了这个，还是不行

直接下我们例程测试

正点原子 · 发表于 2016-8-1 00:28:14

你这代码，怎么感觉怪怪的。
参考我们例程来吧。

frc1 · 发表于 2016-8-1 16:34:15

改成下面这些还是显示不了
#pragma import(__use_no_semihosting)
_sys_exit(int x)
{
x = x;
}
struct __FILE
{
int handle;
/* Whatever you require here. If the only file you are using is */
/* standard output using printf() for debugging, no file handling */
/* is required. */
};
/* FILE is typedef’ d in stdio.h. */
FILE __stdout;

huishun1314 · 发表于 2016-8-2 14:44:52

本帖最后由 huishun1314 于 2016-8-2 14:46 编辑

你这是 jlink 调试时的 printf 打印，不是串口。

参考官方文档：
http://www.keil.com/support/man/ ... race_itm_viewer.htm

硬件连接
ITM机制要求使用SWD方式接口，并需要连接SWO线，一般的四线SWD方式（VCC SDCLK，SDIO，GND）是不行的。必须将SWO(即JTAG模式下的TDO)管脚引出，必须在MDK里设置使用SWD接口。