diff --git a/app/Makefile b/app/Makefile
index a47967991..fba1326d1 100644
--- a/app/Makefile
+++ b/app/Makefile
@@ -1,4 +1,6 @@
-app_objs += $(addprefix app/, app.o)
+app_objs += $(addprefix app/,\
+						app.o\
+						text_input.o)
 products += $(app_objs) app.elf app.hex app.bin
 
 app.elf: $(app_objs)
diff --git a/app/app.cpp b/app/app.cpp
index 6a86d4cd6..043984995 100644
--- a/app/app.cpp
+++ b/app/app.cpp
@@ -6,6 +6,8 @@ extern "C" {
 
 #include <poincare.h>
 
+#include "text_input.h"
+
 void draw_lines_from_center() {
   KDCoordinate width = SCREEN_WIDTH;
   KDCoordinate height = SCREEN_HEIGHT;
@@ -41,7 +43,6 @@ void plot(Expression * e, float xMin, float xMax, float yMin, float yMax) {
   for (KDCoordinate i=0;i<screenWidth; i++) {
     float x = xMin + (xMax-xMin)/screenWidth*i;
     Float xExp = Float(x);
-    //plotContext["x"] = xExp;
     plotContext.setExpressionForSymbolName(&xExp, "x");
     float y = e->approximate(plotContext);
     KDCoordinate j = ((y-yMin)/(yMax-yMin)*screenHeight);
@@ -59,79 +60,38 @@ void funnyPlot() {
   delete e;
 }
 
-void parseInlineExpression() {
-  char * expression = (char*) "1+2/3+4/5+6";
-  Expression * e = Expression::parse(expression);
-  ExpressionLayout * l = e->createLayout(nullptr);
-  l->draw(KDPointMake(0,100));
-  delete l;
-  delete e;
+static void clear_screen() {
+  KDRect r;
+  r.x = 0;
+  r.y = 0;
+  r.width = SCREEN_WIDTH;
+  r.height = SCREEN_HEIGHT;
+  KDFillRect(r, 0x00);
 }
 
-void interactive_expression_parsing() {
-  char input[255];
-  int index = 0;
-  int max = 1;
 
+static void interactive_expression_parsing() {
   while (1) {
-    char character = ion_getchar();
-    if (character == '=') {
-      input[index] = 0;
-      index = 0;
-      max = index+1;
-      Expression * e = Expression::parse(input);
-      if (e) {
-        ExpressionLayout * l = e->createLayout(nullptr);
-        if (l) {
-          l->draw(KDPointMake(0,100));
-          plot(e, 0.0f, 3.0f, 0.0f, 2.0f);
-          delete l;
-        }
-        delete e;
-      } else {
-        KDDrawString("PARSING ERROR", KDPointMake(10,10));
+    char * text_input = get_text();
+    clear_screen();
+    Expression * e = Expression::parse(text_input);
+    if (e) {
+      ExpressionLayout * l = e->createLayout(nullptr);
+      if (l) {
+        l->draw(KDPointMake(0,10));
+        delete l;
       }
-    } else if (character == LEFT_ARROW_KEY) {
-      index--;
-      if (index < 0) {
-        index = 0;
-      }
-    } else if (character == RIGHT_ARROW_KEY) {
-        if (index < max) {
-          index++;
-        }
+      delete e;
     } else {
-      if (index == 0) {
-        KDRect r;
-        r.x = 0;
-        r.y = 0;
-        r.width = SCREEN_WIDTH;
-        r.height = SCREEN_HEIGHT;
-        KDFillRect(r, 0x00);
-      }
-      input[index++] = character;
-      // We are at the end of the line.
-      if (index == max) {
-        input[max++] = ' ';
-        input[max+1] = 0;
-      }
+      KDDrawString("PARSING ERROR", KDPointMake(10,10));
     }
-    // Here we draw the input and inverse the pixels under the cursor.
-    // FIXME: hard coded value
-    KDDrawLine(KDPointMake(0, SCREEN_HEIGHT - 30),
-        KDPointMake(SCREEN_WIDTH, SCREEN_HEIGHT - 30), 0xff);
-    KDDrawString(input, KDPointMake(0, SCREEN_HEIGHT - 15));
-    KDDrawInverseChar(input[index] ? input[index] : ' ',
-        KDPointMake(index*7, SCREEN_HEIGHT - 15));
+    // We dealocate the memory allocated by get_text;
+    free(text_input);
   }
 }
 
 void ion_app() {
-  KDDrawString("Hello, world!", KDPointMake(10,10));
   interactive_expression_parsing();
-  //parseInlineExpression();
-  //funnyPlot();
-  //interactive_expression_parsing();
   while (1) {
     ion_sleep();
   }
diff --git a/app/text_input.cpp b/app/text_input.cpp
new file mode 100644
index 000000000..36eb331d7
--- /dev/null
+++ b/app/text_input.cpp
@@ -0,0 +1,68 @@
+extern "C" {
+#include <kandinsky.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ion.h>
+}
+
+#define PROMPT_HEIGHT 30
+
+static void clear_prompt() {
+  KDRect r;
+  r.x = 0;
+  r.y = SCREEN_HEIGHT - PROMPT_HEIGHT;
+  r.width = SCREEN_WIDTH;
+  r.height = PROMPT_HEIGHT;
+  KDFillRect(r, 0x00);
+}
+
+static void print_prompt(char* text, int index) {
+  // Here we draw the input and inverse the pixels under the cursor.
+  // FIXME: hard coded value
+  KDDrawLine(KDPointMake(0, SCREEN_HEIGHT - PROMPT_HEIGHT),
+      KDPointMake(SCREEN_WIDTH, SCREEN_HEIGHT - PROMPT_HEIGHT), 0xff);
+  KDDrawString(text, KDPointMake(0, SCREEN_HEIGHT - (PROMPT_HEIGHT / 2)));
+  // The hardcoded 7 is the width of the font.
+  KDDrawInverseChar(text[index],
+      KDPointMake(index*7, SCREEN_HEIGHT - (PROMPT_HEIGHT / 2)));
+}
+
+char* get_text() {
+  char input[255] = {0};
+  int index = 0;
+  int max = 0;
+  input[max] = ' ';
+  input[max+1] = '\0';
+
+  while (1) {
+    clear_prompt();
+    print_prompt(input, index);
+    ion_event_t event = ion_get_event();
+    if (event == EQUAL) {
+      break;
+    } else if (event == LEFT_ARROW) {
+      index--;
+      if (index < 0) {
+        index = 0;
+      }
+    } else if (event == RIGHT_ARROW) {
+        if (index < max) {
+          index++;
+        }
+    } else if (event <= 0x7f) {
+      input[index++] = (char) event;
+      // We are at the end of the line.
+      if (index > max) {
+        max++;
+        input[max] = ' ';
+        input[max+1] = '\0';
+      }
+    }
+  }
+  
+  clear_prompt();
+  input[max] = '\0';
+  char* output = (char*) malloc(sizeof(char) * (index + 1));
+  memcpy(output, input, (size_t) (index + 1));
+  return output;
+}
diff --git a/app/text_input.h b/app/text_input.h
new file mode 100644
index 000000000..b7490c2ff
--- /dev/null
+++ b/app/text_input.h
@@ -0,0 +1,8 @@
+#ifndef APP_TEXTINPUT_H
+#define APP_TEXTINPUT_H
+
+/* Returns a pointer to an input text, allocated by the functions (it is thus
+ * the caller's role to free it). */
+char* get_text();
+
+#endif // APP_TEXTINPUT_H
diff --git a/ion/include/ion.h b/ion/include/ion.h
index f17cbb36b..d0131844f 100644
--- a/ion/include/ion.h
+++ b/ion/include/ion.h
@@ -1,6 +1,7 @@
 #ifndef ION_ION_H
 #define ION_ION_H
 
+#include <ion/events.h>
 #include <ion/framebuffer.h>
 #include <ion/keyboard.h>
 
diff --git a/ion/include/ion/events.h b/ion/include/ion/events.h
new file mode 100644
index 000000000..3758b742c
--- /dev/null
+++ b/ion/include/ion/events.h
@@ -0,0 +1,84 @@
+#ifndef ION_EVENTS_H
+#define ION_EVENTS_H
+
+typedef enum {
+  LEFT_PARENTHESIS = '(', // 0x28
+  RIGHT_PARENTHESIS = ')', // 0x29
+  PRODUCT = '*', // 0x2a
+  PLUS = '+', // 0x2b
+  MINUS = '-', // 0x2d
+  DOT = '.', // 0x2e
+  DIVISION = '/', // 0x2f
+  ZERO = '0', // 0x30
+  ONE = '1',
+  TWO = '2',
+  THREE = '3',
+  FOUR = '4',
+  FIVE = '5',
+  SIX = '6',
+  SEVEN = '7',
+  EIGHT = '8',
+  NINE = '9',
+  EQUAL = '=', // 0x3d
+  UPPER_CASE_A = 'A', // 0x41
+  UPPER_CASE_B,
+  UPPER_CASE_C,
+  UPPER_CASE_D,
+  UPPER_CASE_E,
+  UPPER_CASE_F,
+  UPPER_CASE_G,
+  UPPER_CASE_H,
+  UPPER_CASE_I,
+  UPPER_CASE_J,
+  UPPER_CASE_K,
+  UPPER_CASE_L,
+  UPPER_CASE_M,
+  UPPER_CASE_N,
+  UPPER_CASE_O,
+  UPPER_CASE_P,
+  UPPER_CASE_Q,
+  UPPER_CASE_R,
+  UPPER_CASE_S,
+  UPPER_CASE_T,
+  UPPER_CASE_U,
+  UPPER_CASE_V,
+  UPPER_CASE_W,
+  UPPER_CASE_X,
+  UPPER_CASE_Y,
+  UPPER_CASE_Z,
+  POWER = '^', // 0x5e
+  LOWER_CASE_A = 'a', // 0X61
+  LOWER_CASE_B,
+  LOWER_CASE_C,
+  LOWER_CASE_D,
+  LOWER_CASE_E,
+  LOWER_CASE_F,
+  LOWER_CASE_G,
+  LOWER_CASE_H,
+  LOWER_CASE_I,
+  LOWER_CASE_J,
+  LOWER_CASE_K,
+  LOWER_CASE_L,
+  LOWER_CASE_M,
+  LOWER_CASE_N,
+  LOWER_CASE_O,
+  LOWER_CASE_P,
+  LOWER_CASE_Q,
+  LOWER_CASE_R,
+  LOWER_CASE_S,
+  LOWER_CASE_T,
+  LOWER_CASE_U,
+  LOWER_CASE_V,
+  LOWER_CASE_W,
+  LOWER_CASE_X,
+  LOWER_CASE_Y,
+  LOWER_CASE_Z,
+  LEFT_ARROW = 0x100, // events for things outside of ASCII.
+  RIGHT_ARROW,
+  MENU_TRIG,
+  ERROR = 0xffffffff,
+} ion_event_t;
+
+ion_event_t ion_get_event();
+
+#endif
diff --git a/ion/include/ion/keyboard.h b/ion/include/ion/keyboard.h
index e4ef2ab6f..d49a01536 100644
--- a/ion/include/ion/keyboard.h
+++ b/ion/include/ion/keyboard.h
@@ -49,13 +49,6 @@ typedef enum {
 
 #define ION_NUMBER_OF_KEYS 35
 
-#define LEFT_ARROW_KEY '@'
-#define RIGHT_ARROW_KEY '?'
-
-// FIXME: Which state is "true"?
 bool ion_key_down(ion_key_t key);
 
-// This is our keymap
-char ion_getchar();
-
 #endif
diff --git a/ion/src/device/keyboard/keyboard.c b/ion/src/device/keyboard/keyboard.c
index 7da05f06f..fdcab0776 100644
--- a/ion/src/device/keyboard/keyboard.c
+++ b/ion/src/device/keyboard/keyboard.c
@@ -62,7 +62,7 @@ bool ion_key_down(ion_key_t key) {
     GPIO_ODR(GPIOA) = new_odr;
     // We changed the outputs, give the hardware some time to react to this change
     // FIXME: Real delay!
-    for (int i=0;i<1000; i++) {
+    for (volatile int i=0;i<1000; i++) {
     }
   }
 
diff --git a/ion/src/shared/Makefile b/ion/src/shared/Makefile
index cc8875e25..519560249 100644
--- a/ion/src/shared/Makefile
+++ b/ion/src/shared/Makefile
@@ -1 +1,2 @@
-objs += $(addprefix ion/src/shared/, keyboard.o)
+objs += $(addprefix ion/src/shared/,\
+			 	events.o)
diff --git a/ion/src/shared/events.c b/ion/src/shared/events.c
new file mode 100644
index 000000000..b9c18c27f
--- /dev/null
+++ b/ion/src/shared/events.c
@@ -0,0 +1,69 @@
+#include <ion.h>
+
+// More event type will be added later.
+typedef enum {
+  KEY_DOWN,
+} ion_key_event_type_t;
+
+typedef struct {
+  ion_key_t key;
+  ion_key_event_type_t event;
+} ion_key_event_t;
+
+// Debouncing, qnd change to get_key event.
+static ion_key_event_t ion_get_key_event() {
+  // Let's start by saving which keys we've seen up
+  bool key_seen_up[ION_NUMBER_OF_KEYS];
+  for (ion_key_t k=0; k<ION_NUMBER_OF_KEYS; k++) {
+    key_seen_up[k] = !ion_key_down(k);
+  }
+
+  // Wait a little to debounce the button.
+  // FIXME: REAL SLEEP
+  for (volatile int i=0;i<10000;i++) {
+  }
+
+  /* Let's discard the keys we previously saw up but which aren't anymore: those
+   * were probably bouncing! */
+  for (ion_key_t k=0; k<ION_NUMBER_OF_KEYS; k++) {
+    key_seen_up[k] &= !ion_key_down(k);
+  }
+
+  while (1) {
+    for (ion_key_t k=0; k<ION_NUMBER_OF_KEYS; k++) {
+      if (ion_key_down(k)) {
+        if (key_seen_up[k]) {
+          return (ion_key_event_t) {.key = k, .event = KEY_DOWN};
+        }
+      } else {
+        key_seen_up[k] = 1;
+      }
+    }
+    ion_sleep();
+    // FIXME: REAL SLEEP
+    for (int i=0;i<10000;i++) {
+    }
+  }
+}
+
+// For now this is a bit silly but needed for instreface purpose.
+static const ion_event_t kEventForKeyDown[ION_NUMBER_OF_KEYS] = {
+  UPPER_CASE_A, UPPER_CASE_B, UPPER_CASE_C, UPPER_CASE_D, UPPER_CASE_E,
+  UPPER_CASE_F, UPPER_CASE_G, UPPER_CASE_H, UPPER_CASE_I, UPPER_CASE_J,
+  UPPER_CASE_K, UPPER_CASE_L, UPPER_CASE_M, LEFT_ARROW, RIGHT_ARROW,
+  SEVEN, EIGHT, NINE, LEFT_PARENTHESIS, RIGHT_PARENTHESIS,
+  FOUR, FIVE, SIX, PRODUCT, DIVISION,
+  ONE, TWO, THREE, PLUS, MINUS,
+  ZERO, DOT, LOWER_CASE_X, POWER, EQUAL
+};
+
+ion_event_t ion_get_event() {
+  // First we get a key event.
+  const ion_key_event_t key_event = ion_get_key_event();
+  // We then generate the event associated to this key event.
+  if (key_event.event == KEY_DOWN) {
+    return kEventForKeyDown[key_event.key];
+  } else {
+    return ERROR;
+  }
+}
diff --git a/ion/src/shared/keyboard.c b/ion/src/shared/keyboard.c
deleted file mode 100644
index c78e30f48..000000000
--- a/ion/src/shared/keyboard.c
+++ /dev/null
@@ -1,46 +0,0 @@
-#include <ion.h>
-#include <string.h>
-
-static const char kCharForKey[ION_NUMBER_OF_KEYS] = {
-  'A', 'B', 'C', 'D', 'E',
-  'F', 'G', 'H', 'I', 'J',
-  'K', 'L', 'M', LEFT_ARROW_KEY, RIGHT_ARROW_KEY,
-  '7', '8', '9', '(', ')',
-  '4', '5', '6', '*', '/',
-  '1', '2', '3', '+', '-',
-  '0', '.', 'x', '^', '='
-};
-
-char ion_getchar() {
-  // Let's start by saving which keys we've seen up
-  bool key_seen_up[ION_NUMBER_OF_KEYS];
-  for (ion_key_t k=0; k<ION_NUMBER_OF_KEYS; k++) {
-    key_seen_up[k] = !ion_key_down(k);
-  }
-
-  // Wait a little to debounce the button.
-  // FIXME: REAL SLEEP
-  for (int i=0;i<10000;i++) {
-  }
-  /* Let's discard the keys we previously saw up but which aren't anymore: those
-   * were probably bouncing! */
-  for (ion_key_t k=0; k<ION_NUMBER_OF_KEYS; k++) {
-    key_seen_up[k] &= !ion_key_down(k);
-  }
-
-  while (1) {
-    for (ion_key_t k=0; k<ION_NUMBER_OF_KEYS; k++) {
-      if (ion_key_down(k)) {
-        if (key_seen_up[k]) {
-          return kCharForKey[k];
-        }
-      } else {
-        key_seen_up[k] = 1;
-      }
-    }
-    ion_sleep();
-    // FIXME: REAL SLEEP
-    for (int i=0;i<10000;i++) {
-    }
-  }
-}
diff --git a/kandinsky/src/rect.c b/kandinsky/src/rect.c
index 28fdf0c68..5d8cec101 100644
--- a/kandinsky/src/rect.c
+++ b/kandinsky/src/rect.c
@@ -5,9 +5,6 @@
 KDRect KDRectZero = {.x = 0, .y = 0, .width = 0, .height = 0};
 
 void KDFillRect(KDRect rect, KDColor color) {
-  //for (KDCoordinate y = rect.y ; y < (rect.y + rect.height); y++) {
-    //memset(KDPixelAddress((KDPoint){.x=rect.x, .y=y}), color, rect.width);
-  //}
   KDPoint p;
   for (p.x = rect.x; p.x<(rect.x+rect.width); p.x++) {
     for (p.y = rect.y; p.y<(rect.y+rect.height); p.y++) {