Start of public OpenTitan development history
Code contributors:
Alex Bradbury <asb@lowrisc.org>
Cindy Chen <chencindy@google.com>
Eunchan Kim <eunchan@google.com>
Gaurang Chitroda <gaurangg@google.com>
Mark Hayter <mark.hayter@gmail.com>
Michael Schaffner <msf@google.com>
Miguel Osorio <miguelosorio@google.com>
Nils Graf <nilsg@google.com>
Philipp Wagner <phw@lowrisc.org>
Pirmin Vogel <vogelpi@lowrisc.org>
Ram Babu Penugonda <rampenugonda@google.com>
Scott Johnson <scottdj@google.com>
Shail Kushwah <kushwahs@google.com>
Srikrishna Iyer <sriyer@google.com>
Steve Nelson <Steve.Nelson@wdc.com>
Tao Liu <taliu@google.com>
Timothy Chen <timothytim@google.com>
Tobias Wölfel <tobias.woelfel@mailbox.org>
Weicai Yang <weicai@google.com>
diff --git a/sw/lib/usb_simpleserial.h b/sw/lib/usb_simpleserial.h
new file mode 100644
index 0000000..52ca8be
--- /dev/null
+++ b/sw/lib/usb_simpleserial.h
@@ -0,0 +1,42 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef __USB_SIMPLESERIAL_H__
+#define __USB_SIMPLESERIAL_H__
+
+#include "common.h"
+#include "usbdev.h"
+
+// This is only here because caller of _init needs it
+typedef struct usb_ss_ctx {
+ void *ctx;
+ int ep;
+ int cur_buf;
+ int cur_cpos;
+ union usb_ss_b2w {
+ uint32_t data_w;
+ uint8_t data_b[4];
+ } chold;
+ void (*got_byte)(uint8_t);
+} usb_ss_ctx_t;
+
+/**
+ * Send a byte on a simpleserial endpoint
+ * ssctx - instance context
+ * c - byte to send
+ */
+void usb_simpleserial_send_byte(usb_ss_ctx_t *ssctx, uint8_t c);
+
+/**
+ * Initialize a simpleserial endpoint
+ *
+ * ctx - initialized usbdev context
+ * ep - endpoint number for this instance
+ * ssctx - unintialized simpleserial instance context
+ * got_byte - callback function for when a byte is received
+ */
+void usb_simpleserial_init(usb_ss_ctx_t *ssctx, usbdev_ctx_t *ctx, int ep,
+ void (*got_byte)(uint8_t));
+
+#endif
