From 04e440e608865dfb10c5061cd979ef81153fd5eb Mon Sep 17 00:00:00 2001
From: Cacodemon345 <wahil1976@outlook.com>
Date: Sun, 7 May 2023 00:33:15 +0600
Subject: [PATCH] usb: Start implementing end-of-frame and start-of-frame
 signals

---
 src/usb.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/usb.c b/src/usb.c
index 3310c0786..cde3ee4a9 100644
--- a/src/usb.c
+++ b/src/usb.c
@@ -239,6 +239,18 @@ ohci_set_interrupt(usb_t* usb, uint8_t bit)
     usb_interrupt_ohci(usb);
 }
 
+void
+ohci_end_of_frame(usb_t* dev)
+{
+    /* TODO: Put endpoint and transfer descriptor processing here. */
+}
+
+void
+ohci_start_of_frame(usb_t* dev)
+{
+    ohci_set_interrupt(dev, OHCI_HcInterruptEnable_SO);
+}
+
 void
 ohci_update_frame_counter(void* priv)
 {
@@ -246,12 +258,15 @@ ohci_update_frame_counter(void* priv)
 
     dev->ohci_mmio_w[OHCI_HcFmRemaining / 2] &= 0x3fff;
     if (dev->ohci_mmio_w[OHCI_HcFmRemaining / 2] == 0) {
+        ohci_end_of_frame(dev);
         dev->ohci_mmio_w[OHCI_HcFmRemaining / 2] = dev->ohci_mmio_w[OHCI_HcFmInterval / 2] & 0x3fff;
         dev->ohci_mmio_l[OHCI_HcFmRemaining / 4] &= ~(1 << 31);
         dev->ohci_mmio_l[OHCI_HcFmRemaining / 4] |= dev->ohci_mmio_l[OHCI_HcFmInterval / 4] & (1 << 31);
-        ohci_set_interrupt(dev, OHCI_HcInterruptEnable_SO);
+        dev->ohci_mmio_w[OHCI_HcFmNumber / 2]++;
+        ohci_start_of_frame(dev);
     }
     if (dev->ohci_mmio_w[OHCI_HcFmRemaining / 2]) dev->ohci_mmio_w[OHCI_HcFmRemaining / 2]--;
+    timer_on_auto(&dev->ohci_frame_timer, 1. / (12. * 1000. * 1000.));
 }
 
 void