blocks|key|3271903|text|将GPIO_PULLDOWN模式更改为GPIO_FLOATING+(或类似的内容)！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3271904|entityMap^0|1|D|J|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Change the <code>GPIO_PULLDOWN</code> mode to <code>GPIO_FLOATING</code> (or something similar)!

blocks|key|346434|text|将按钮的GPIO拉力设置为“拉”：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|346435|#include+"stm32f4xx.h"
#include+"stm32f4xx_nucleo.h"
#include+"system_stm32f4xx.h"
#include+"stm32f4xx_hal_gpio.h"
#include+"stm32f4xx_hal_rcc.h"

GPIO_InitTypeDef+GPIO_InitStructure;+

int+main(void)+{

++++HAL_Init();+

++++__GPIOA_CLK_ENABLE();
++++GPIO_InitStructure.Pin+++=+GPIO_PIN_5;
++++GPIO_InitStructure.Mode++=+GPIO_MODE_OUTPUT_PP;++++
++++GPIO_InitStructure.Pull++=+GPIO_PULLUP;
++++GPIO_InitStructure.Speed+=+GPIO_SPEED_HIGH;++
++++HAL_GPIO_Init(GPIOA,+&GPIO_InitStructure);++++

++++__GPIOC_CLK_ENABLE();
++++GPIO_InitStructure.Pin+++=+GPIO_PIN_13;
++++GPIO_InitStructure.Mode++=+GPIO_MODE_INPUT;
++++GPIO_InitStructure.Pull++=+GPIO_PULLUP;
++++GPIO_InitStructure.Speed+=+GPIO_SPEED_FAST;
++++HAL_GPIO_Init(GPIOC,+&GPIO_InitStructure);

++++while+(1)+{
++++++++if+(HAL_GPIO_ReadPin(GPIOC,+GPIO_PIN_13))+{+++++++++
++++++++++++HAL_GPIO_WritePin(GPIOA,+GPIO_PIN_5,+GPIO_PIN_RESET);+
++++++++}+else+{
++++++++++++HAL_GPIO_WritePin(GPIOA,+GPIO_PIN_5,+GPIO_PIN_SET);
++++++++}
++++}
}|code-block|syntax|javascript|346436|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Set your button's GPIO Pull to PULLUP:

<pre><code>#include "stm32f4xx.h"
#include "stm32f4xx_nucleo.h"
#include "system_stm32f4xx.h"
#include "stm32f4xx_hal_gpio.h"
#include "stm32f4xx_hal_rcc.h"

GPIO_InitTypeDef GPIO_InitStructure; 

int main(void) {

 HAL_Init(); 

 __GPIOA_CLK_ENABLE();
 GPIO_InitStructure.Pin = GPIO_PIN_5;
 GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP; 
 GPIO_InitStructure.Pull = GPIO_PULLUP;
 GPIO_InitStructure.Speed = GPIO_SPEED_HIGH; 
 HAL_GPIO_Init(GPIOA, &amp;GPIO_InitStructure); 

 __GPIOC_CLK_ENABLE();
 GPIO_InitStructure.Pin = GPIO_PIN_13;
 GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
 GPIO_InitStructure.Pull = GPIO_PULLUP;
 GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
 HAL_GPIO_Init(GPIOC, &amp;GPIO_InitStructure);

 while (1) {
 if (HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_13)) { 
 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET); 
 } else {
 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);
 }
 }
}
</code></pre>

blocks|key|345854|text|我也有同样的问题--这就是我是如何解决的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|345855|while+(1)+{
++++++++int+stateOfPushButton+=+HAL_GPIO_ReadPin(GPIOC,+GPIO_PIN_13);
++++++++if+(+stateOfPushButton+==+1+)+{+++++++++
++++++++++++HAL_GPIO_WritePin(GPIOA,+GPIO_PIN_5,+GPIO_PIN_RESET);+
++++++++}+else+{
++++++++++++HAL_GPIO_WritePin(GPIOA,+GPIO_PIN_5,+GPIO_PIN_SET);
++++++++}
++++}|code-block|syntax|javascript|345856|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I had the same issue this is how I solve it:

<pre><code>while (1) {
 int stateOfPushButton = HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_13);
 if ( stateOfPushButton == 1 ) { 
 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET); 
 } else {
 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);
 }
 }
</code></pre>

blocks|key|3766747|text|如果您的按钮具有较高的电流种类，如我的机械2状态开关，则需要使用此代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3766748|GPIO_InitStructure.Pull++=+GPIO_PULLUP;|code-block|syntax|javascript|3766749|添加int变量也不会有什么影响，只需确保在启动主while函数之前只对变量进行一次初始化，否则就会导致内存泄漏。|3766750|此外，我还看到您不熟悉函数，请尝试以下操作：|3766751|int+main(void)+{

++++/*+Configure+the+system+clock+*/
++++SystemClock_Config();

++++/*+Initialize+all+configured+peripherals+*/
++++MX_GPIO_Init();
++++HAL_Init();
++++/*+Infinite+loop+*/
++++/*+USER+CODE+BEGIN+WHILE+*/
++++while+(1)
++++{
++++++++/*+start+your+stuff*/
++++++++/*+doping+stuff*/
++++++++/*+end+your+stuff*/
++++}

}

/*+System+Clock+Configuration*/
void+SystemClock_Config(void)
{
++RCC_OscInitTypeDef+RCC_OscInitStruct;
++RCC_ClkInitTypeDef+RCC_ClkInitStruct;

++__HAL_RCC_PWR_CLK_ENABLE();

++__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
++RCC_OscInitStruct.OscillatorType+=+RCC_OSCILLATORTYPE_HSE;
++RCC_OscInitStruct.HSEState+=+RCC_HSE_ON;
++RCC_OscInitStruct.PLL.PLLState+=+RCC_PLL_ON;
++RCC_OscInitStruct.PLL.PLLSource+=+RCC_PLLSOURCE_HSE;
++RCC_OscInitStruct.PLL.PLLM+=+8;
++RCC_OscInitStruct.PLL.PLLN+=+336;
++RCC_OscInitStruct.PLL.PLLP+=+RCC_PLLP_DIV2;
++RCC_OscInitStruct.PLL.PLLQ+=+4;
++if+(HAL_RCC_OscConfig(&RCC_OscInitStruct)+!=+HAL_OK)
++{
++++++Error_Handler();
++}
++RCC_ClkInitStruct.ClockType+=+RCC_CLOCKTYPE_HCLK%7CRCC_CLOCKTYPE_SYSCLK
++++++++++++++++++++++++%7CRCC_CLOCKTYPE_PCLK1%7CRCC_CLOCKTYPE_PCLK2;
++RCC_ClkInitStruct.SYSCLKSource+=+RCC_SYSCLKSOURCE_PLLCLK;
++RCC_ClkInitStruct.AHBCLKDivider+=+RCC_SYSCLK_DIV1;
++RCC_ClkInitStruct.APB1CLKDivider+=+RCC_HCLK_DIV4;
++RCC_ClkInitStruct.APB2CLKDivider+=+RCC_HCLK_DIV2;
++if+(HAL_RCC_ClockConfig(&RCC_ClkInitStruct,+FLASH_LATENCY_5)+!=+HAL_OK)
++{
++++++Error_Handler();
++}

++HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

++HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

++/*+SysTick_IRQn+interrupt+configuration+*/
++HAL_NVIC_SetPriority(SysTick_IRQn,+0,+0);
}

static+void+MX_GPIO_Init(void)
{

++GPIO_InitTypeDef+GPIO_InitStruct;

++/*+GPIO+Ports+Clock+Enable+*/
++__HAL_RCC_GPIOH_CLK_ENABLE();
++__HAL_RCC_GPIOA_CLK_ENABLE();
++__HAL_RCC_GPIOD_CLK_ENABLE();

++/*Configure+GPIO+pins+:+P_BUT_Pin+R_BUT_Pin+O_BUT_Pin+I_CSW_Pin+*/
++GPIO_InitStruct.Pin+=+P_BUT_Pin%7CR_BUT_Pin%7CO_BUT_Pin%7CI_CSW_Pin;
++GPIO_InitStruct.Mode+=+GPIO_MODE_INPUT;
++GPIO_InitStruct.Pull+=+GPIO_PULLUP;
++HAL_GPIO_Init(GPIOD,+&GPIO_InitStruct);

++/*Configure+GPIO+pins+:+P_LED_Pin+R_LED_Pin+O_LED_Pin+C_LED_Pin+*/
++GPIO_InitStruct.Pin+=+P_LED_Pin%7CR_LED_Pin%7CO_LED_Pin%7CC_LED_Pin;
++GPIO_InitStruct.Mode+=+GPIO_MODE_OUTPUT_PP;
++GPIO_InitStruct.Pull+=+GPIO_PULLUP;
++GPIO_InitStruct.Speed+=+GPIO_SPEED_FAST;
++HAL_GPIO_Init(GPIOD,+&GPIO_InitStruct);

++/*Configure+GPIO+pin+Output+Level+*/
++HAL_GPIO_WritePin(GPIOD,+P_LED_Pin%7CR_LED_Pin%7CO_LED_Pin%7CC_LED_Pin,+
GPIO_PIN_RESET);

}|3766752|或者，如果您不自信，可以考虑使用以下工具：[http://www.st.com/en/development-tools/stm32cubemx.html]|offset|length|3766753|entityMap|0|LINK|mutability|MUTABLE|url|http://www.st.com/en/development-tools/stm32cubemx.html]^0|0|0|0|0|0|L|1L|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

This bit of code is what you want to use if your buttons are of the higher current variety like my mechanical 2 state switches:

<pre><code>GPIO_InitStructure.Pull = GPIO_PULLUP;
</code></pre>

and adding an int variable also wouldn't hurt, just make sure to do the initialization of your variables only once before starting the main while function, otherwise you end up with leaky memory.

also i see you are not familiar with functions, try the following:

<pre><code>int main(void) {

 /* Configure the system clock */
 SystemClock_Config();

 /* Initialize all configured peripherals */
 MX_GPIO_Init();
 HAL_Init();
 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
 /* start your stuff*/
 /* doping stuff*/
 /* end your stuff*/
 }

}

/* System Clock Configuration*/
void SystemClock_Config(void)
{
 RCC_OscInitTypeDef RCC_OscInitStruct;
 RCC_ClkInitTypeDef RCC_ClkInitStruct;

 __HAL_RCC_PWR_CLK_ENABLE();

 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
 RCC_OscInitStruct.HSEState = RCC_HSE_ON;
 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
 RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
 RCC_OscInitStruct.PLL.PLLM = 8;
 RCC_OscInitStruct.PLL.PLLN = 336;
 RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
 RCC_OscInitStruct.PLL.PLLQ = 4;
 if (HAL_RCC_OscConfig(&amp;RCC_OscInitStruct) != HAL_OK)
 {
 Error_Handler();
 }
 RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
 |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
 RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
 RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
 RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
 if (HAL_RCC_ClockConfig(&amp;RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
 {
 Error_Handler();
 }

 HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

 HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

 /* SysTick_IRQn interrupt configuration */
 HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

static void MX_GPIO_Init(void)
{

 GPIO_InitTypeDef GPIO_InitStruct;

 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOH_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOD_CLK_ENABLE();

 /*Configure GPIO pins : P_BUT_Pin R_BUT_Pin O_BUT_Pin I_CSW_Pin */
 GPIO_InitStruct.Pin = P_BUT_Pin|R_BUT_Pin|O_BUT_Pin|I_CSW_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
 GPIO_InitStruct.Pull = GPIO_PULLUP;
 HAL_GPIO_Init(GPIOD, &amp;GPIO_InitStruct);

 /*Configure GPIO pins : P_LED_Pin R_LED_Pin O_LED_Pin C_LED_Pin */
 GPIO_InitStruct.Pin = P_LED_Pin|R_LED_Pin|O_LED_Pin|C_LED_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_PULLUP;
 GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
 HAL_GPIO_Init(GPIOD, &amp;GPIO_InitStruct);

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOD, P_LED_Pin|R_LED_Pin|O_LED_Pin|C_LED_Pin, 
GPIO_PIN_RESET);

}
</code></pre>

or if you are not confident, consider using a tool such as this:[<a href="http://www.st.com/en/development-tools/stm32cubemx.html]" rel="nofollow noreferrer">http://www.st.com/en/development-tools/stm32cubemx.html]</a>

blocks|key|3272036|text|每当您下载代码到您的板上，微停留在重置模式，这就是为什么您的代码似乎无法工作。一旦您按下黑色重置按钮，它将运行您的代码从main()，一切都将运行良好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3272037|只要记得每次你在你的微电脑上闪现新代码时都要重置。|3272038|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Whenever you download code to your board the micro stays in a RESET mode which is why your code appears to not work. Once you press the BLACK RESET button it will run your code from main() and everything will work fine.

Just remember to RESET every time you flash new code on your micro.

blocks|key|3272045|text|如果您使用Keil，请转到目标选项->+Debug+->选择正在使用的调试器，并在下载函数中单击Settings+->，检查“重置并运行”，因此代码重置并在每次您在核心板上闪过它时运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3272046|您的代码和GPIO设置与我的Nucleo-F401RE一起在CubeMX+IDE上工作，您只需在Keil中启用‘重置和运行’，如果这是您正在使用的IDE。|3272047|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If you using Keil MDK, go to your Target options -> Debug -> Select the debugger you are using and click Settings -> In download functions check 'Reset and Run', so the code resets and runs every time you flash it on your Nucleo board.

Your code and GPIO setup works on CubeMX IDE with my Nucleo-F401RE, you just have to enable 'Reset and Run' in Keil if that's the IDE you are using.

I am trying to run a simple program on my new Nucleo board,

I made this program in order to turn on and off the green led when I press the user's button (the blue one),

<pre><code>#include "stm32f4xx.h"
#include "stm32f4xx_nucleo.h"
#include "system_stm32f4xx.h"
#include "stm32f4xx_hal_gpio.h"
#include "stm32f4xx_hal_rcc.h"

GPIO_InitTypeDef GPIO_InitStructure; 

int main(void) {

 HAL_Init(); 

 __GPIOA_CLK_ENABLE();
 GPIO_InitStructure.Pin = GPIO_PIN_5;
 GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP; 
 GPIO_InitStructure.Pull = GPIO_PULLUP;
 GPIO_InitStructure.Speed = GPIO_SPEED_HIGH; 
 HAL_GPIO_Init(GPIOA, &amp;GPIO_InitStructure); 

 __GPIOC_CLK_ENABLE();
 GPIO_InitStructure.Pin = GPIO_PIN_13;
 GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
 GPIO_InitStructure.Pull = GPIO_PULLDOWN;
 GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
 HAL_GPIO_Init(GPIOC, &amp;GPIO_InitStructure);

 while (1) {
 if (HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_13)) { 
 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET); 
 } else {
 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);
 }
 }
}
</code></pre>

But I am getting wrong result:

<ul>
<li>when I press the user's button, nothing happen,</li>
<li>when I keep pressing the user's button and I restart (by pressing the black button), I get good result,</li>
</ul>

It seems like the program checks the state of the blue button only at the first run, I don't know why,

Please help me if you have any ideas of what the problem comes from, or if you have a running program that switch the led on button press.

STM32F401RE-Nucleo LED and BUTTON's example

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正试着在我的新的核心板上运行一个简单的程序，我制作这个程序是为了当我按下用户的按钮(蓝色的)时，打开和关闭绿色的led，#include "stm32f4xx.h"#include "stm32f4xx_nucleo.h"#include "system_stm32f4xx.h"#include "stm32f4xx...

问STM32F401RE核发光二极管及纽扣实例
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