add hhkb bluetooth functionality (rn42) (#2693)

* add hhkb bluetooth functionality (rn42)

pretty much straight from tmk

some minor changes to make things work

* hhkb jp personal keymap

* Revert "hhkb jp personal keymap"

This reverts commit 886713d8bb98572f03110f285706a8140a083892.

1 files changed, 265 insertions, 0 deletions

diff --git a/keyboards/hhkb/rn42/rn42.c b/keyboards/hhkb/rn42/rn42.c
new file mode 100644
index 0000000000..859e401490
--- /dev/null
+++ b/keyboards/hhkb/rn42/rn42.c
@@ -0,0 +1,265 @@
+#include <avr/io.h>
+#include "host.h"
+#include "host_driver.h"
+#include "serial.h"
+#include "rn42.h"
+#include "print.h"
+#include "timer.h"
+#include "wait.h"
+
+
+/* Host driver */
+static uint8_t keyboard_leds(void);
+static void send_keyboard(report_keyboard_t *report);
+static void send_mouse(report_mouse_t *report);
+static void send_system(uint16_t data);
+static void send_consumer(uint16_t data);
+
+host_driver_t rn42_driver = {
+    keyboard_leds,
+    send_keyboard,
+    send_mouse,
+    send_system,
+    send_consumer
+};
+
+
+void rn42_init(void)
+{
+    // JTAG disable for PORT F. write JTD bit twice within four cycles.
+    MCUCR |= (1<<JTD);
+    MCUCR |= (1<<JTD);
+
+    // PF7: BT connection control(high: connect, low: disconnect)
+    rn42_autoconnect();
+
+    // PF6: linked(input without pull-up)
+    DDRF  &= ~(1<<6);
+    PORTF |=  (1<<6);
+
+    // PF1: RTS(low: allowed to send, high: not allowed)
+    DDRF &= ~(1<<1);
+    PORTF &= ~(1<<1);
+
+    // PD5: CTS(low: allow to send, high:not allow)
+    DDRD |= (1<<5);
+    PORTD &= ~(1<<5);
+
+    serial_init();
+}
+
+int16_t rn42_getc(void)
+{
+    return serial_recv2();
+}
+
+const char *rn42_gets(uint16_t timeout)
+{
+    static char s[24];
+    uint16_t t = timer_read();
+    uint8_t i = 0;
+    int16_t c;
+    while (i < 23 && timer_elapsed(t) < timeout) {
+        if ((c = rn42_getc()) != -1) {
+            if ((char)c == '\r') continue;
+            if ((char)c == '\n') break;
+            s[i++] = c;
+        }
+    }
+    s[i] = '\0';
+    return s;
+}
+
+void rn42_putc(uint8_t c)
+{
+    serial_send(c);
+}
+
+void rn42_puts(char *s)
+{
+    while (*s)
+	serial_send(*s++);
+}
+
+bool rn42_autoconnecting(void)
+{
+    // GPIO6 for control connection(high: auto connect, low: disconnect)
+    // Note that this needs config: SM,4(Auto-Connect DTR Mode)
+    return (PORTF & (1<<7) ? true : false);
+}
+
+void rn42_autoconnect(void)
+{
+    // hi to auto connect
+    DDRF |= (1<<7);
+    PORTF |= (1<<7);
+}
+
+void rn42_disconnect(void)
+{
+    // low to disconnect
+    DDRF |= (1<<7);
+    PORTF &= ~(1<<7);
+}
+
+bool rn42_rts(void)
+{
+    // low when RN-42 is powered and ready to receive
+    return PINF&(1<<1);
+}
+
+void rn42_cts_hi(void)
+{
+    // not allow to send
+    PORTD |= (1<<5);
+}
+
+void rn42_cts_lo(void)
+{
+    // allow to send
+    PORTD &= ~(1<<5);
+}
+
+bool rn42_linked(void)
+{
+    // RN-42 GPIO2
+    //   Hi-Z:  Not powered
+    //   High:  Linked
+    //   Low:   Connecting
+    return PINF&(1<<6);
+}
+
+
+static uint8_t leds = 0;
+static uint8_t keyboard_leds(void) { return leds; }
+void rn42_set_leds(uint8_t l) { leds = l; }
+
+
+void rn42_send_str(const char *str)
+{
+    uint8_t c;
+    while ((c = pgm_read_byte(str++)))
+        rn42_putc(c);
+}
+
+const char *rn42_send_command(const char *cmd)
+{
+    static const char *s;
+    rn42_send_str(cmd);
+    wait_ms(500);
+    s = rn42_gets(100);
+    xprintf("%s\r\n", s);
+    rn42_print_response();
+    return s;
+}
+
+void rn42_print_response(void)
+{
+    int16_t c;
+    while ((c = rn42_getc()) != -1) {
+        xprintf("%c", c);
+    }
+}
+
+
+static void send_keyboard(report_keyboard_t *report)
+{
+    // wake from deep sleep
+/*
+    PORTD |= (1<<5);    // high
+    wait_ms(5);
+    PORTD &= ~(1<<5);   // low
+*/
+
+    serial_send(0xFD);  // Raw report mode
+    serial_send(9);     // length
+    serial_send(1);     // descriptor type
+    serial_send(report->mods);
+    serial_send(0x00);
+    serial_send(report->keys[0]);
+    serial_send(report->keys[1]);
+    serial_send(report->keys[2]);
+    serial_send(report->keys[3]);
+    serial_send(report->keys[4]);
+    serial_send(report->keys[5]);
+}
+
+static void send_mouse(report_mouse_t *report)
+{
+    // wake from deep sleep
+/*
+    PORTD |= (1<<5);    // high
+    wait_ms(5);
+    PORTD &= ~(1<<5);   // low
+*/
+
+    serial_send(0xFD);  // Raw report mode
+    serial_send(5);     // length
+    serial_send(2);     // descriptor type
+    serial_send(report->buttons);
+    serial_send(report->x);
+    serial_send(report->y);
+    serial_send(report->v);
+}
+
+static void send_system(uint16_t data)
+{
+    // Table 5-6 of RN-BT-DATA-UB
+    // 81,82,83 scan codes can be used?
+}
+
+
+static uint16_t usage2bits(uint16_t usage)
+{
+    switch (usage) {
+        case AC_HOME:                 return 0x01;
+        case AL_EMAIL:                return 0x02;
+        case AC_SEARCH:               return 0x04;
+        //case AL_KBD_LAYOUT:         return 0x08;  // Apple virtual keybaord toggle
+        case AUDIO_VOL_UP:            return 0x10;
+        case AUDIO_VOL_DOWN:          return 0x20;
+        case AUDIO_MUTE:              return 0x40;
+        case TRANSPORT_PLAY_PAUSE:    return 0x80;
+        case TRANSPORT_NEXT_TRACK:    return 0x100;
+        case TRANSPORT_PREV_TRACK:    return 0x200;
+        case TRANSPORT_STOP:          return 0x400;
+        case TRANSPORT_STOP_EJECT:    return 0x800;
+        case TRANSPORT_FAST_FORWARD:  return 0x1000;
+        case TRANSPORT_REWIND:        return 0x2000;
+        //case return 0x4000;   // Stop/eject
+        //case return 0x8000;   // Internet browser
+    };
+    return 0;
+}
+
+static void send_consumer(uint16_t data)
+{
+    uint16_t bits = usage2bits(data);
+    serial_send(0xFD);  // Raw report mode
+    serial_send(3);     // length
+    serial_send(3);     // descriptor type
+    serial_send(bits&0xFF);
+    serial_send((bits>>8)&0xFF);
+}
+
+
+/* Null driver for config_mode */
+static uint8_t config_keyboard_leds(void);
+static void config_send_keyboard(report_keyboard_t *report);
+static void config_send_mouse(report_mouse_t *report);
+static void config_send_system(uint16_t data);
+static void config_send_consumer(uint16_t data);
+
+host_driver_t rn42_config_driver = {
+    config_keyboard_leds,
+    config_send_keyboard,
+    config_send_mouse,
+    config_send_system,
+    config_send_consumer
+};
+
+static uint8_t config_keyboard_leds(void) { return leds; }
+static void config_send_keyboard(report_keyboard_t *report) {}
+static void config_send_mouse(report_mouse_t *report) {}
+static void config_send_system(uint16_t data) {}
+static void config_send_consumer(uint16_t data) {}