From acb403bcbcbc05256500083d1caea7e22ce4db11 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Thu, 25 May 2017 21:56:08 +0100
Subject: Basic keyboard implementation

---
 usb/endpt1.c | 71 +++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 51 insertions(+), 20 deletions(-)

(limited to 'usb/endpt1.c')

diff --git a/usb/endpt1.c b/usb/endpt1.c
index 0580349..dcfc61b 100644
--- a/usb/endpt1.c
+++ b/usb/endpt1.c
@@ -19,40 +19,73 @@
 #include <reg/usbotg.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdbool.h>
+
+#include <reg/gpio.h>
 
 #include "../uart.h"
 
 #include "bdt.h"
 #include "endpt1.h"
+#include "keycodes.h"
+#include "txhandler.h"
 
 #define MAX_PACKET 64
 
-static unsigned char report[4][4] = {
-	{ 0x00, 5, 0, 0x00, },
-	{ 0x00, 0, 5, 0x00, },
-	{ 0x00, -5, 0, 0x00, },
-	{ 0x00, 0, -5, 0x00, },
-};
-static int nextrep;
+static struct tx_ctx tx;
+#define THIS_EP 1
+static volatile struct usb0_bd (* const this_bdt)[2] = usb_bdt[THIS_EP];
 
-void usb_endpt1_enable(void)
+unsigned char report[29];
+volatile bool sendrep;
+
+void usb_endpt1_setkey(enum keycode keycode, bool state)
 {
-	nextrep = 0;
+	unsigned char byte, bit;
+
+	if (keycode == KEY_NONE)
+		return;
+
+	keycode -= 4;
+	byte = keycode / 8;
+	bit = keycode % 8;
+
+	if (state)
+		SET_BIT(report[byte], bit);
+	else
+		UNSET_BIT(report[byte], bit);
+
+	sendrep = true;
+}
 
-	usb_bdt[1][BDT_TX][BDT_EVEN].addr = &report[0];
-	usb_bdt[1][BDT_TX][BDT_EVEN].desc = USB0_BD_INIT(4, nextrep % 2);
-	nextrep++;
+void usb_endpt1_send(void)
+{
+	if (!sendrep)
+		return;
+	if (!tx_isempty(&tx)) {
+		return;
+	}
+
+	tx_que(&tx, report, sizeof report);
+	sendrep = false;
+}
+
+void usb_endpt1_enable(void)
+{
+	this_bdt[BDT_TX][BDT_EVEN].addr = NULL;
+	this_bdt[BDT_TX][BDT_EVEN].desc = 0;
 
-	usb_bdt[1][BDT_TX][BDT_ODD].addr = &report[1];
-	usb_bdt[1][BDT_TX][BDT_ODD].desc = USB0_BD_INIT(4, nextrep % 2);
-	nextrep++;
+	this_bdt[BDT_TX][BDT_ODD].addr = NULL;
+	this_bdt[BDT_TX][BDT_ODD].desc = 0;
 
-	USB0_ENDPT(1) = BV(ENDPT_EPTXEN) | BV(ENDPT_EPHSHK);
+	USB0_ENDPT(THIS_EP) = BV(ENDPT_EPTXEN) | BV(ENDPT_EPHSHK);
+	tx = TX_CTX(this_bdt[BDT_TX], MAX_PACKET);
+	tx_que(&tx, report, sizeof report);
 }
 
 void usb_endpt1_disable(void)
 {
-	USB0_ENDPT(1) = 0;
+	USB0_ENDPT(THIS_EP) = 0;
 }
 
 void usb_endpt1_token(uint8_t state)
@@ -63,9 +96,7 @@ void usb_endpt1_token(uint8_t state)
 
 	switch (GET_BITS(bd->desc, BD_TOK_PID)) {
 	case BD_TOK_PID_IN:
-		bd->addr = &report[nextrep];
-		bd->desc = USB0_BD_INIT(4, nextrep % 2);
-		nextrep = (nextrep + 1) % 4;
+		tx_push(&tx);
 		break;
 	}
 }
-- 
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