sony: Add buzzer support

converter/news_usb/Makefile

@@ -10,6 +10,7 @@ TARGET_DIR = .
 # keyboard dependent files
 SRC =	matrix.c \
 	led.c \
+	tone.c \
 	news.c
 
 CONFIG_H = config.h

converter/news_usb/README.md

@@ -2,23 +2,32 @@ Sony NEWS keyboard converter
 ============================
 Sony NEWS is a BSD workstation with 68K/MIPS released in 1987 in Japan.
 
-- http://en.wikipedia.org/wiki/Sony_NEWS
-- https://www.sony.net/SonyInfo/CorporateInfo/History/SonyHistory/2-12.html#block3
-
 This converter allows NEWS keyboard to be connected to modern PC via USB. It works with NWP-5461 and NWP-411A.
 
-How DIP switches work is unknown and you may need to turn all switches off with this converter.
-
 Limitations:
-- Speaker/Buzzer is not supported.
 - LEDs on NWP-5461 is not supported.
-
+- Mouse is not supported.
-Pics:
-- http://imgur.com/a/JyMzw
 
 Discussion:
 - https://geekhack.org/index.php?topic=25759
 
+Resources:
+- https://github.com/tmk/tmk_keyboard/wiki/Sony-NEWS
+
+
+Wiring
+------
+Use PD2(USART RXD) for 'Keyboard Data' pin and give power with VCC and GND. Other pins are optional and not supported at this point.
+
+    AVR     NEWS
+    ------------------------
+    PD2     Keyboard Data
+    PD3     Keyboard Command
+    PD4     Mouse Data
+    PD0     BZ
+
+Target microcontroller is Atmel ATMega32U2 by default but porting this project to other 8-bit AVR controllers would be easy.
+
 
 
 Protocol
@@ -42,6 +51,7 @@ For example 0x29 is sent when 'a' key is pressed and 0xA9 when released.
     +---------------- break flag: sets when released
 
 
+
 Scan Codes
 ----------
 ### NWP-5461
@@ -118,3 +128,17 @@ I have three NWP-5461s and GND and FG is connected in one of them for some reaso
     8 NC
     9 FG
     NOTE: These are just from my guess and not confirmed.
+
+
+
+Buzzer
+------
+You can control buzzer using `tone()` and `noTone()`. BZ pin should be connected to PD0.
+
+- `void tone(unsigned int frequency, unsigned long duration)`
+- `void noTone(void)`
+
+`tone()` sounds buzzer in frequency(in hertz) for duration(in milliseconds).
+When giving -1 as duration to `tone()` buzzer makes a sound forever until `noTone()` is called.
+
+Buzzer is not used by default firmware.

converter/news_usb/matrix.c

@@ -58,6 +58,8 @@ void matrix_init(void)
     return;
 }
 
+void tone(unsigned int frequency, unsigned long duration);
+void noTone(void);
 uint8_t matrix_scan(void)
 {
     uint8_t code;
@@ -76,6 +78,7 @@ uint8_t matrix_scan(void)
         // make code
         if (!matrix_is_on(ROW(code), COL(code))) {
             matrix[ROW(code)] |=  (1<<COL(code));
+            //tone(80, 100);
         }
     }
     return code;