KeyMatrix-Library (STM32F4)源碼

ID:263845 · 發(fā)表于 2017-12-19 19:16

KeyMatrix Library (STM32F4)

Here is a library with which you can connect a keypad that is built as an X / Y matrix to the STM32F4.

It does not matter what the arrangement of the key matrix is (3 × 3, 4 × 3, 2 × 5, etc.).
No external diodes or pull-ups are needed.

In the H-file the size of the keyboard matrix is set (in the example 3 × 4)
and in the C-File the GPIO pins are assigned to the X and Y direction.

There is a function to read out the pressed key, which returns "0" if no key is pressed. If one or more keys are pressed, the key number of the first key found is returned. (In Example 1 to 12)

To debounce the buttons no timer but only a loop counter is used.
(this event needs to be adapted for you)

Note: if the return value is> 0 even if no keyboard is connected, external pull-ups (4k7) must be attached to the Y-lines.

Images :

//--------------------------------------------------------------
// File    : main.c
// Datum : 02.05.2014
// Version  : 1.0
// Autor : UB
// EMail : mc-4u(@)t-online.de
// CPU    : STM32F4
// IDE    : CooCox CoIDE 1.7.4
// GCC    : 4.7 2012q4
// Module : CMSIS_BOOT, M4_CMSIS_CORE
// Funktion : Demo der Key-Matrix-Library
// Hinweis  : Diese zwei Files muessen auf 8MHz stehen
//             "cmsis_boot/stm32f4xx.h"
//             "cmsis_boot/system_stm32f4xx.c"
//--------------------------------------------------------------

#include "main.h"
#include "stm32_ub_keymatrix.h"
#include "stm32_ub_led.h"

int main(void)
{
  uint8_t key_value;

  SystemInit(); // Quarz Einstellungen aktivieren

  // init der LEDs
  UB_Led_Init();

  // init der Tastatur-Matrix
  UB_KeyMatrix_Init();

  while(1)
  {
// Tastatur-Matrix abfragen
key_value=UB_KeyMatrix_Scan();
// LEDs je nach Tasten-Nr schalten
if(key_value==1) UB_Led_On(LED_GREEN); else UB_Led_Off(LED_GREEN);
if(key_value==2) UB_Led_On(LED_RED); else UB_Led_Off(LED_RED);
if(key_value==3) UB_Led_On(LED_BLUE); else UB_Led_Off(LED_BLUE);
if(key_value==4) UB_Led_On(LED_ORANGE); else UB_Led_Off(LED_ORANGE);
  }
}

全部資料51hei下載地址：

Demo_83_KEY_Matrix.zip (173.43 KB, 下載次數(shù): 12)

帳號		自動登錄	找回密碼
密碼			立即注冊

亚洲春色中文字幕久久久-三上亚,一吻二脱三床四吻胸,国产真实伦对白视频全集,在线毛片观看,精品成品入口黄网,国产毛aⅴ片久久久,亚洲AV色香蕉一区二区三区老师,萧皇后A级艳片,色情日本视频更新,99久久亚洲精品日本无码

KeyMatrix-Library (STM32F4)源碼

評分