implemented the keyboard interface

numworks_port/README.md

@@ -12,7 +12,7 @@ This is a bare metal os attempt on the numworks n0110
 ### Zeta bare minimum
 - [x] Working thing
 - [x] Led interface
-- [ ] Keyboard interface
+- [x] Keyboard interface
 - [ ] Set clock and all
     - [ ] adapt ms_wait() and us_wait()
 - [ ] Screen interface

numworks_port/src/Laplace/keyboard.c

@@ -41,6 +41,7 @@
 
 const uint8_t number_of_rows = 9;
 const uint8_t number_of_columns = 6;
+const char row_list[9] = {'B', 'A', 'C', 'D', 'E', 'F', 'G', 'H', 'I'};
 
 void keyboard_init(){
     for (int i = 0; i < number_of_rows; i++){
@@ -57,12 +58,6 @@ void keyboard_init(){
     }
 }
 
-bool keyboard_scan(){
-    set_output_pin(GPIO_A, 6, true);
-    bool key_state = read_input_pin(GPIO_C, 3);
-    return key_state; 
-    // A LOT TODO
-}
 
 void activate_row(uint8_t row_nb){
     // set all row to 0 and then reenable selected row
@@ -72,3 +67,21 @@ void activate_row(uint8_t row_nb){
     set_output_pin(GPIO_A, row_nb, false);
     us_wait(100);
 }
+
+struct button* keyboard_scan(){
+    static struct button result_button_list[54] = {};
+    uint8_t i = 0;
+    for(int r = 0; r < number_of_rows; r++){
+        activate_row(r);
+        
+        for(int c = 0; c < number_of_columns; c++){
+            bool key_state = read_input_pin(GPIO_C, c);
+            result_button_list[i].row = row_list[r];
+            result_button_list[i].column = c + 1;
+            result_button_list[i].state = key_state;
+            i++;
+        }
+    }
+    return result_button_list;
+}
+

numworks_port/src/Laplace/keyboard.h

@@ -7,21 +7,16 @@
 #ifndef KEYBOARD_H
 #define KEYBOARD_H
 
-enum PIN_ROW {
-	A = 1,
-	B = 0,
-	C = 2,
-    D = 3,
-	E = 4,
-	F = 5,
-    G = 6,
-	H = 7,
-	I = 8
-};
-
 #include "gpio_helper.h"
 
+struct button{
+	uint8_t column;
+	char row;
+	bool state;
+};
+
+
 void keyboard_init();
-bool keyboard_scan();
+struct button* keyboard_scan();
 
 #endif

numworks_port/src/main.c

@@ -8,11 +8,17 @@ void main_entry(){
     set_led_green(true);
     while (1)
     {
-        /*if(keyboard_scan()){
-            set_led_green(true);
-        }else{
-            set_led_green(false);
-        }*/
+        struct button * keyboard_state = keyboard_scan();
+        for(int i =0; i < 54; i++){
+            if(keyboard_state[i].column == 4 && keyboard_state[i].row == 'H'){
+                if(keyboard_state[i].state){
+                    set_led_green(true);
+                }else{
+                    set_led_green(false);
+                }
+                break;
+            }
+        }
     }
     
 }