stmhal: Update and improve LCD driver.

Still some method names to iron out, and funtionality to add, but this
will do for the first, basic version.

stmhal/lcd.h

@@ -24,6 +24,4 @@
  * THE SOFTWARE.
  */
 
-void lcd_init(void);
-void lcd_print_str(const char *str);
-void lcd_print_strn(const char *str, unsigned int len);
+extern const mp_obj_type_t pyb_lcd_type;

stmhal/main.c

@@ -58,7 +58,6 @@
 #include "storage.h"
 #include "sdcard.h"
 #include "ff.h"
-#include "lcd.h"
 #include "rng.h"
 #include "accel.h"
 #include "servo.h"
@@ -95,10 +94,6 @@ void __fatal_error(const char *msg) {
     led_state(4, 1);
     stdout_tx_strn("\nFATAL ERROR:\n", 14);
     stdout_tx_strn(msg, strlen(msg));
-#if 0 && MICROPY_HW_HAS_LCD
-    lcd_print_strn("\nFATAL ERROR:\n", 14);
-    lcd_print_strn(msg, strlen(msg));
-#endif
     for (uint i = 0;;) {
         led_toggle(((i++) & 3) + 1);
         for (volatile uint delay = 0; delay < 10000000; delay++) {
@@ -333,11 +328,6 @@ soft_reset:
     pin_init();
     extint_init();
 
-#if MICROPY_HW_HAS_LCD
-    // LCD init (just creates class, init hardware by calling LCD())
-    lcd_init();
-#endif
-
     // local filesystem init
     {
         // try to mount the flash

stmhal/modpyb.c

@@ -54,6 +54,7 @@
 #include "accel.h"
 #include "servo.h"
 #include "dac.h"
+#include "lcd.h"
 #include "usb.h"
 #include "ff.h"
 #include "portmodules.h"
@@ -390,6 +391,10 @@ STATIC const mp_map_elem_t pyb_module_globals_table[] = {
 #if MICROPY_HW_HAS_MMA7660
     { MP_OBJ_NEW_QSTR(MP_QSTR_Accel), (mp_obj_t)&pyb_accel_type },
 #endif
+
+#if MICROPY_HW_HAS_LCD
+    { MP_OBJ_NEW_QSTR(MP_QSTR_LCD), (mp_obj_t)&pyb_lcd_type },
+#endif
 };
 
 STATIC const mp_obj_dict_t pyb_module_globals = {

stmhal/printf.c

@@ -196,23 +196,13 @@ int pfenv_printf(const pfenv_t *pfenv, const char *fmt, va_list args) {
 }
 
 void stdout_print_strn(void *data, const char *str, unsigned int len) {
-    // send stdout to UART, USB CDC VCP, and LCD if nothing else
-    bool any = false;
-
+    // TODO this needs to be replaced with a proper stdio interface ala CPython
+    // send stdout to UART and USB CDC VCP
     if (pyb_uart_global_debug != PYB_UART_NONE) {
         uart_tx_strn_cooked(pyb_uart_global_debug, str, len);
-        any = true;
     }
     if (usb_vcp_is_enabled()) {
         usb_vcp_send_strn_cooked(str, len);
-        any = true;
-    }
-    if (!any) {
-#if 0
-#if MICROPY_HW_HAS_LCD
-        lcd_print_strn(str, len);
-#endif
-#endif
     }
 }
 

stmhal/pybstdio.c

@@ -38,11 +38,14 @@
 #include "usb.h"
 #include "uart.h"
 
+// TODO make stdin, stdout and stderr writable objects so they can
+// be changed by Python code.
+
 void stdout_tx_str(const char *str) {
     if (pyb_uart_global_debug != PYB_UART_NONE) {
         uart_tx_str(pyb_uart_global_debug, str);
     }
-#if defined(USE_HOST_MODE) && MICROPY_HW_HAS_LCD
+#if 0 && defined(USE_HOST_MODE) && MICROPY_HW_HAS_LCD
     lcd_print_str(str);
 #endif
     usb_vcp_send_str(str);
@@ -52,7 +55,7 @@ void stdout_tx_strn(const char *str, uint len) {
     if (pyb_uart_global_debug != PYB_UART_NONE) {
         uart_tx_strn(pyb_uart_global_debug, str, len);
     }
-#if defined(USE_HOST_MODE) && MICROPY_HW_HAS_LCD
+#if 0 && defined(USE_HOST_MODE) && MICROPY_HW_HAS_LCD
     lcd_print_strn(str, len);
 #endif
     usb_vcp_send_strn(str, len);

stmhal/qstrdefsport.h

@@ -57,7 +57,6 @@ Q(have_cdc)
 Q(hid)
 Q(time)
 Q(rng)
-Q(LCD)
 Q(SD)
 Q(SDcard)
 Q(FileIO)
@@ -247,6 +246,17 @@ Q(sleep)
 // for input
 Q(input)
 
+// for LCD class
+Q(LCD)
+Q(command)
+Q(contrast)
+Q(light)
+Q(fill)
+Q(get)
+Q(pixel)
+Q(text)
+Q(show)
+
 // for stm module
 Q(stm)
 Q(mem)

stmhal/usb.c

@@ -199,7 +199,6 @@ void USR_KEYBRD_ProcessData(uint8_t pbuf) {
     led_state(4, 1);
     USB_OTG_BSP_mDelay(50);
     led_state(4, 0);
-    //lcd_print_strn((char*)&pbuf, 1);
     usb_keyboard_key = pbuf;
 }