矩阵键盘程序，作为麦知club小车项目的一部分，从IAR 状态机应用修改而来。
IAR7.4+STM32CUBEMX调试通过。
键盘行4，列3，每条线都有10K上拉电阻。改到4×4矩阵也很容易。
行线设置为输入，针脚为浮空；列线设置为开漏输出。不支持长按和组合键，主要是我不会改。 电热水器控制器在OS中使用20ms任务周期调用。以下贴出代码。keypad.h
[cpp] view plain copy /* * * Name: keypad.h */ #ifndef KEYPAD_H #define KEYPAD_H #include
"stm32f1xx_hal.h" #include "pinname.h" #define
PORT_KEY GPIOD #define COLS
(GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6) // 读pin
//#define In(GPIO_Pin) (PORT_KEY->IDR &
轮道GPIO_Pin) #define In(GPIO_Pin)
三五太难了
HAL_GPIO_ReadPin(PORT_KEY, GPIO_Pin) // 写1到Pin //#define High(GPIO_Pin) PORT_KEY->BSRR = GPIO_Pin #define High(GPIO_Pin) HAL_GPIO_WritePin(PORT_KEY, GPIO_Pin, GPIO_PIN_SET) // 写0到Pin //#define
Low(GPIO_Pin) PORT_KEY->BSRR = (uint32_t)GPIO_Pin << 16 #define Low(GPIO_Pin)
HAL_GPIO_WritePin(PORT_KEY, GPIO_Pin,
GPIO_PIN_RESET) /* * 0 1 2 3 * 4 5 6
7 * 8 9 10 11 * 12 13 14 15 */ typedef enum { Key_Up = 0x02, Key_Left = 0x03,
Key_Right = 0x04, Key_Down = 0x08, Key_On = 0x09, Key_Mode = 0x0a, Key_None = 0xFF } KeyPressed; static const int row_count = 4; static const int col_count = 3; uint16_t bus_out(void); void Keypad(void); char AnyKey(void); char SameKey(void); char ScanKey(void); void FindKey(void); void
ClearKey(void); void Read(void); /** Start the keypad interrupt routines */ void Start(void); /** Stop th泰森多边形
键盘映射e keypad interrupt routines */ void Stop(void); void Cols_out(uint16_t v); void Scan_Keyboard(void); KeyPressed getKey(void); #endif // KEYPAD_H
keypad.c
[cpp] view plain copy /* * * Name: keypad.cpp * */
#include "keypad.h" // State: char KeyState; // Bit pattern after each scan: char KeyCode; // Output value from
the virtual 74HC922: KeyPressed KeyValue; // KeyDown is set if key is down: char KeyDown; // KeyNew is set every time a new key is down: char KeyNew; // 映射表char KeyTable[12][2]; // Pin of Row uint16_t _rows[] = {KEYx0, KEYx1, KEYx2, KEYx3}; uint16_t _cols[] = {KEYy0, KEYy1, KEYy2}; //构造函数void
鲁米那Keypad(void) { Stop(); KeyState = 0; // 按键状态初始0 } //扫描键盘void
Scan_Keyboard(void){ switch (KeyState) { case 0:
{ if (AnyKey()) { char scankey = ScanKey(); if (scankey != 0xff) KeyCode = scankey; KeyState = 1; } b
reak; } case 1: { if (SameKey()) { FindKey(); KeyState = 2; } else KeyState = 0; break; } case 2: { if (SameKey()) { } else
KeyState = 3; break; } case 3:
{ if (SameKey()) { KeyState = 2; } else { ClearKey(); KeyState = 0; } break; } } // func end } // 有键按下char AnyKey(void) { //Start(); //拉低int r = -1; for (r = 0; r < row_count; r++) { if (In(_rows[r]) == 0) // In macro break; } //Stop(); //恢复
if (!(0 <= r && r < row_count)) return 0; else return 1; } // 键按下，键值相同char SameKey(void) { // char KeyCode_new = KeyCode; char KeyCode_new = ScanKey(); if (KeyCode == KeyCode_new) return 1; else return 0; }
// 扫描键char ScanKey(void) { /* 行扫描*/ int r = -1; for (r = 0; r < row_count; r++) { if (In(_rows[r]) == 0) // In macro break; } /* 若没有到有效行，返回*/ if (!(0 <= r
&& r < row_count)) { return
0xff; } /* 列扫描，出行上哪个被拉低*/ int c = -1; for (c = 0; c < col_count;
c++) { // 轮流输出列线Cols_out(~(1
<< c)); if (In(_rows[r]) == 0) //
In macro break; } /* 给所有的列重新充电*/ Start(); /* 若没有到有效列，返回*/ if (!(0 <= c && c < col_count)) return 0xff; return r * col_count + c; } // FindKey compares KeyCode to values in KeyTable. // If match, KeyValue, KeyDown and KeyNew are updated. void FindKey(void) { KeyValue = (KeyPressed)KeyCode; KeyDown = 1; KeyNew = 1; } void ClearKey(void)
{ KeyDown = 0; } KeyPressed getKey(void)
{ if(KeyNew) { KeyNew = 0; return KeyValue; } else return Key_None; } void Start(void) { /* 列输出0，拉低行*/
PORT_KEY->BRR = COLS; } void Stop(void)
{ /* 列输出1，使行不被拉低*/
PORT_KEY->BSRR = COLS; } // cols bus output void Cols_out(uint16_t v) { if ((v & 0x01) > 0) //0b001 High(_cols[0]); else Low(_cols[0]); if ((v & 0x02) > 0) //0b010 High(_cols[1]);
else Low(_cols[1]); if ((v & 0x04) > 0) //0b100 High(_cols[2]); else
Low(_cols[2]);
} 按键操作可以改到寄存器操作，提高速度。
使用mbed写，会更省事，可惜VBT6的RAM太少。
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