stm32F103状态机矩阵键盘（精编版）

1、stm32f103 状态机矩阵键盘矩阵键盘程序， 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。在 os 中使用 20ms 任务周期调用。以下贴出代码。keypad.hcpp view plain copy /* * * name: keypad.h */#ifndef keypad_h#define keypad_h#include "stm32f

2、1xx_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 & gpio_pin)#define in(gpio_pin)hal_gpio_readpin(port_key, gpio_pin)/写 1 到 pin/#define high(gpio_pin) port_key->bsrr = gpio

3、_pin #define high(gpio_pin) hal_gpio_writepin(port_key,gpio_pin, gpio_pin_set)/写 0 到 pin/#definelow(gpio_pin) port_key->bsrr = (uint32_t)gpio_pin << 16#define low(gpio_pin) hal_gpio_writepin(port_key, gpio_pin, gpio_pin_reset)/*0123 *4567 *891011 *12 13 1415 */typedef enumkey_up

4、 = 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 cl

5、earkey(void);void read(void);/* start the keypad interrupt routines */void start(void);/* stop the keypad interrupt routines */void stop(void);void cols_out(uint16_t v);void scan_keyboard(void);keypressed getkey(void); #endif / keypad_hkeypad.ccpp view plain copy /* * * name: keypad.cpp * */ #includ

6、e "keypad.h"/ state:char keystate;/ bitpattern after each scan:char keycode;/ output value fromthe 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 keytable122;/ pin of rowuint16_t _rows =keyx

7、0, keyx1, keyx2, keyx3;uint16_t _cols =keyy0, keyy1, keyy2;/ 构造函数void 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;break;case 1: if (samekey() findkey();keystat

8、e = 2; elsekeystate = 0;break;case 2:if (samekey() elsekeystate = 3;break;case 3:if (samekey() keystate = 2; else clearkey();keystate = 0; break;/ func end/有键按下charanykey(void) /start();/ 拉低int r = -1;for (r= 0; r < row_count; r+) if (in(_rowsr) = 0)/in macrobreak;/stop();/ 恢复if (!(0 <

9、= r && r < row_count)return 0; elsereturn 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;elsereturn 0;/扫描键char scankey(void) /*行扫描*/intr = -1;for (r = 0; r < row_count; r+) if (in(_rowsr) = 0)/

10、in macrobreak;/*若没有找到有效行，返回*/if (!(0 <= r&& r < row_count) return0xff;/* 列扫描，找出行上哪个被拉低 */int c = -1;for (c = 0; c < col_count; c+) / 轮流输出列线cols_out(1 << c);if (in(_rowsr) = 0) /in macrobreak;/*给所有的列重新充电*/start();/*若没有找到有效列， 返回*/if (!(0 <= c &

11、amp;amp;& 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;elsereturn 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)/0b001high(_cols0);elselow(_cols0)