Display: finally get rid of i2c_test.c.

Not without dubbing its remaining functionality in form of a
display_greeting(), of course.

display.h

@@ -39,6 +39,7 @@ void display_init(void);
 void display_tick(void);
 void display_clear(void);
 
+void display_greeting(void);
 void display_clock(void);
 void display_set_cursor(uint8_t line, uint8_t column);
 void display_writechar(uint8_t data);

display_ssd1306.c

@@ -53,8 +53,6 @@
       logo, like "Welcome to Teacup" as a greeting screen, like writing numbers
       to readable places and so on.
 
-    - Get rid of i2c_test.c.
-
     - Allow different fonts. Already paraphrased in font.h and font.c. Needs
       a selection menu in Configtool, of course, the same way one can select
       display types.
@@ -84,6 +82,7 @@
 #include "displaybus.h"
 #include "font.h"
 #include "sendf.h"
+#include "delay.h"
 #include "dda.h"
 
 
@@ -176,6 +175,30 @@ void display_set_cursor(uint8_t line, uint8_t column) {
   displaybus_write(0x10 | ((column >> 4) & 0x0F), 1);
 }
 
+/**
+  Show a nice greeting. Pure eye candy.
+*/
+void display_greeting(void) {
+
+  display_clear();
+
+  /**
+    "Welcome to Teacup" is 64 pixel columns wide, entire display is
+    128 columns, so we offset by 32 columns to get it to the center.
+  */
+  display_set_cursor(1, 32);
+
+  display_writestr_P(PSTR("Welcome to Teacup"));
+
+  // Forward this to the display immediately.
+  while (buf_canread(display)) {
+    display_tick();
+  }
+
+  // Allow the user to worship our work for a moment :-)
+  delay_ms(5000);
+}
+
 /**
   Regular update of the display. Typically called once a second from clock.c.
 */

i2c_test.c

@@ -1,32 +0,0 @@
-
-/**
-  Quick test for sending some visible data to a SSD1306 display connected
-  via I2C. This means not to test the display, but the I2C implementation.
-
-  To run this test, add this line to board or printer config.h:
-
-    #define I2C
-
-  With this done, a welcome message should appear on the display. Without
-  these additions, the binary size should be as small as the commit before.
-*/
-
-#ifdef I2C_TEST
-
-#include <string.h>
-#include "config_wrapper.h"
-#include "display.h"
-#include "font.h"
-#include "sendf.h"
-
-
-static void i2c_test(void) {
-  /**
-    "Welcome to Teacup" is 64 pixel columns wide, entire display is
-    128 columns, so we offset by 32 columns to get it to the center.
-  */
-  display_set_cursor(1, 32);
-  sendf_P(display_writechar, PSTR("Welcome to Teacup"));
-}
-
-#endif /* I2C_TEST */

mendel.c

@@ -30,13 +30,6 @@
 #endif
 
 #include	"config_wrapper.h"
-#ifdef I2C
-  // This is temporary, until display code is completed.
-  // It includes static i2c_test(), which is called in init():
-  #define I2C_TEST
-  #include "i2c_test.c"
-  #undef I2C_TEST
-#endif
 #include "cpu.h"
 #include	"serial.h"
 #include	"dda_queue.h"
@@ -125,8 +118,7 @@ void init(void) {
 
   #ifdef DISPLAY
     display_init();
-    display_clear();
-    i2c_test();
+    display_greeting();
   #endif
 
 	// say hi to host