Revision 0:7da3ab010a87, committed 2019-05-06

Comitter:

marvas

Date:

Mon May 06 10:27:01 2019 +0000

Commit message:

keypad kutuphanesi

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Keypad.cpp	Mon May 06 10:27:01 2019 +0000
@@ -0,0 +1,124 @@
+#include "Keypad.h"
+
+Keypad::Keypad(
+    PinName kq, PinName kx, PinName ky, PinName kz,
+    PinName ka, PinName kb, PinName kc, PinName kd
+)
+{
+    k_in[0]  = new DigitalIn (ka, PullUp);
+    k_in[1]  = new DigitalIn (kb, PullUp);
+    k_in[2]  = new DigitalIn (kc, PullUp);
+    k_in[3]  = new DigitalIn (kd, PullUp);
+    
+    k_out[0] = new DigitalOut (kq);
+    k_out[1] = new DigitalOut (kx);
+    k_out[2] = new DigitalOut (ky);
+    k_out[3] = new DigitalOut (kz);
+    
+    *k_out[0] = 1;
+    *k_out[1] = 1;
+    *k_out[2] = 1;
+    *k_out[3] = 1;
+    
+    uint8_t j,i;
+    for (j = 0; j < 4; j++){
+        for(i = 0; i < 4; i++){
+            key_transent_cntr[j][i] = CHNG_CNT;
+            key_state[j][i] = Off_state;
+        }
+    }
+    for(i = 0; i < BF_SIZE; i++){
+        buf[i] = 0;
+    }
+    read_addr = 0;
+    write_addr = 0;
+    tk.attach_us(callback(this, &Keypad::key_scan), 2000);     // 2mS
+}
+
+void Keypad::key_scan(void)
+{
+    //my_led = 1;
+    for (int32_t j = 0; j < 4; j++){
+        *k_out[0] = 1;   *k_out[1] = 1;  *k_out[2] = 1; *k_out[3] = 1;
+        *k_out[j] = 0;
+        wait_us(1);
+        for (int32_t i = 0; i < 4; i++){
+            switch (key_state[j][i]){
+                case Off_state:
+                    //my_led = 1;
+                    if (*k_in[i] == 0){ // key on
+                        key_state[j][i] = Off_to_on_transient;
+                        key_transent_cntr[j][i] = CHNG_CNT;
+                    }
+                    break;
+                case Off_to_on_transient:
+                    //my_led = 1;
+                    if (*k_in[i] == 0){ // key on
+                        if (--key_transent_cntr[j][i] < -CHNG_CNT){
+                            //my_led = 1;
+                            bf_put(j * 4 + i + 1); // save data into buffer
+                            key_state[j][i] = On_state;
+                        }
+                    } else {    // key off
+                        if (++key_transent_cntr[j][i] > CHNG_CNT){
+                            key_state[j][i] = Off_state;
+                        }
+                    }
+                    break;
+                case On_state:
+                    //my_led = 1;
+                    if (*k_in[i] == 1){ // key off
+                        key_state[j][i] = On_to_off_transient;
+                        key_transent_cntr[j][i] = -CHNG_CNT;
+                    }
+                    break;
+                case On_to_off_transient:
+                    //my_led = 1;
+                    if (*k_in[i] == 0){ // key on
+                        if (--key_transent_cntr[j][i] < -CHNG_CNT){
+                            key_state[j][i] = On_state;
+                        }
+                    } else {    // key off
+                        if (++key_transent_cntr[j][i] > CHNG_CNT){
+                            key_state[j][i] = Off_state;
+                        }
+                    }
+                    break;
+                default:    // just in case
+                    key_state[j][i] = Off_state;
+                    break;
+            }
+            //my_led = 0;
+        }
+    }
+    *k_out[0] = 1;   *k_out[1] = 1;  *k_out[2] = 1; *k_out[3] = 1;
+    //my_led = 0;
+}
+
+uint8_t Keypad::read(void)
+{
+    return bf_get();
+}
+
+void Keypad::bf_put(char dt)
+{
+    uint8_t next = write_addr + 1;
+    if (next == BF_SIZE) {
+        next = 0;
+    }
+    buf[write_addr] = dt;
+    write_addr = next;
+}
+
+int8_t Keypad::bf_get (void){
+    if (read_addr == write_addr){
+        return 0;
+    }
+    uint8_t dt = buf[read_addr];
+    ++read_addr;
+    if (read_addr == BF_SIZE){
+        read_addr = 0;
+    }
+    return dt;
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Keypad.h	Mon May 06 10:27:01 2019 +0000
@@ -0,0 +1,70 @@
+#ifndef KEYPAD_H
+#define KEYPAD_H
+
+#include "mbed.h"
+
+#define  CHNG_CNT       4
+
+ /*
+  @code
+  #include "mbed.h"
+  #include "Keypad.h"
+ 
+Keypad key(D10, D9, D8, D7, D6, D5, D4, D3);
+ 
+ char key_table[] = { 
+                      '1', '2', '3', 'A',
+                      '4', '5', '6', 'B',
+                      '7', '8', '9', 'C',
+                      '*', '0', '#', 'D'
+                    };
+  int main() {
+      uint32_t key_num;
+      while(true) {
+         while ((key_num = key.read()) != 0){
+             printf("%c\r\n", *(key_table + key_num-1));
+         }
+         wait(1.0);  
+     }
+ }
+ * @endcode
+ */
+
+class Keypad {
+public:
+    /** 4x4 keypad interface:
+     *  @param key input port           A,B,C,D
+     *  @param key output(scan) port    Q,X,Y,Z
+     */
+    Keypad(PinName qx, PinName kx, PinName ky, PinName kz,
+           PinName ka, PinName kb, PinName kc, PinName kd);
+                    
+    /** Read key data into buffer
+     *  @param none
+     *  @return key number by ASCII code
+     */
+    uint8_t read(void);
+
+protected:
+    DigitalIn   *k_in[4];
+    DigitalOut  *k_out[4];
+    Ticker      tk;
+
+    // key control
+    enum State {Off_state, Off_to_on_transient, On_state, On_to_off_transient};
+    volatile State  key_state[4][4];
+    volatile int8_t key_transent_cntr[4][4];
+    void key_scan(void);
+    
+    // buffer control
+    #define BF_SIZE 20
+    uint8_t         read_addr;
+    uint8_t         write_addr;
+    uint8_t         buf[BF_SIZE];
+    void bf_put (char dat);
+    int8_t bf_get (void);
+
+};
+
+#endif // KEYPAD_H
+