copyright notices, coroutines

1 files changed, 35 insertions, 35 deletions

diff --git a/usb_keyboard.c b/usb_keyboard.c
index eed1b88..8212c60 100644
--- a/usb_keyboard.c
+++ b/usb_keyboard.c
@@ -1,3 +1,9 @@
+/* usb_keyboard.c - Implementation of a USB keyboard device
+ *
+ * Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-Licence-Identifier: AGPL-3.0-or-later
+ */
+
 #include "tusb.h"
 
 #include "tusb_helpers.h" /* for TUD_ENDPOINT_IN */
@@ -34,46 +40,40 @@ void usb_keyboard_init() {
 		});
 }
 
-#define kbd_buf_cap 1024
-static uint32_t kbd_buf[kbd_buf_cap];
-static size_t kbd_buf_beg = 0;
-static size_t kbd_buf_len = 0;
-
 static uint8_t ascii2keycode[128][2] = { HID_ASCII_TO_KEYCODE };
 
-void usb_keyboard_task(void) {
-	static bool sent_key = false;
-	if (tud_hid_n_ready(kbd_ifc)) {
-		uint8_t const report_id = 0;
-		uint8_t modifier = 0;
-		uint8_t keycodes[6] = {0};
-
-		if (kbd_buf_len && !sent_key) {
-			if (ascii2keycode[kbd_buf[kbd_buf_beg]][0])
-				modifier = KEYBOARD_MODIFIER_LEFTSHIFT;
-			keycodes[0] = ascii2keycode[kbd_buf[kbd_buf_beg]][1];
-
-			kbd_buf_beg++;
-			if (kbd_buf_beg == kbd_buf_cap)
-				kbd_buf_beg = 0;
-			kbd_buf_len--;
-		}
+void usb_keyboard_cr(void *_stack) {
+	usb_keyboard_stack_t *stack = _stack;
 
-		tud_hid_n_keyboard_report(kbd_ifc, report_id, modifier, keycodes);
-		sent_key = !sent_key;
-	}
-}
+	cr_begin();
 
-bool usb_keyboard_send_char(uint32_t ch) {
-	if (kbd_buf_len == kbd_buf_cap) /* buffer full */
-		return false;
-	if (ch > 0x7F) /* not ASCII */
-		return false;
-	kbd_buf[(kbd_buf_beg + kbd_buf_len++) % kbd_buf_cap] = ch;
-}
+	for (;;) {
+		while (!tud_hid_n_ready(kbd_ifc))
+			cr_yield();
+
+		if (cr_chan_have_req(stack->chan)) {
+			cr_chan_recv_req(stack->chan, &stack->rune);
+
+			stack->modifier = ascii2keycode[stack->rune][0] ? KEYBOARD_MODIFIER_LEFTSHIFT : 0;
+			stack->keycodes[0] = ascii2keycode[stack->rune][1];
+			tud_hid_n_keyboard_report(kbd_ifc, stack->report_id, stack->modifier, stack->keycodes);
+
+			while (!tud_hid_n_ready(kbd_ifc))
+				cr_yield();
+
+			stack->modifier = 0;
+			stack->keycodes[0] = 0;
+			tud_hid_n_keyboard_report(kbd_ifc, stack->report_id, stack->modifier, stack->keycodes);
+
+			cr_chan_send_resp(stack->chan, 1);
+		} else {
+			stack->modifier = 0;
+			stack->keycodes[0] = 0;
+			tud_hid_n_keyboard_report(kbd_ifc, stack->report_id, stack->modifier, stack->keycodes);
+		}
+	}
 
-bool usb_keyboard_is_flushed(void) {
-	return kbd_buf_len == 0;
+	cr_end()
 }
 
 /**