From 2e626bc722375f441e826cb403967206eacf2161 Mon Sep 17 00:00:00 2001
From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Sun, 29 Dec 2019 01:31:08 +0100
Subject: [PATCH] application: Define UART0_IRQHandler().

Writes received data to the global uart0_rx_buf ringbuffer.
---
 SConscript.libcommon     |  1 +
 SConscript.target        |  1 +
 src/application/main.rs  |  2 ++
 src/application/uart0.rs | 38 ++++++++++++++++++++++++++++++++++++++
 src/common/uart0.c       | 31 +++++++++++++++++++++++++++++++
 5 files changed, 73 insertions(+)
 create mode 100644 src/application/uart0.rs
 create mode 100644 src/common/uart0.c

diff --git a/SConscript.libcommon b/SConscript.libcommon
index e52b43a..f15e239 100644
--- a/SConscript.libcommon
+++ b/SConscript.libcommon
@@ -26,6 +26,7 @@ source_files_c = [
     'src/common/systick.c',
     'src/common/ringbuf.c',
     'src/common/flash.c',
+    'src/common/uart0.c',
     'src/common/usb_device_ch9.c',
     'src/common/usb_device_dci.c',
     'src/common/usb_device_descriptor.c',
diff --git a/SConscript.target b/SConscript.target
index 7beba88..74ea714 100644
--- a/SConscript.target
+++ b/SConscript.target
@@ -83,6 +83,7 @@ for s in ['intermediate', 'final']:
 
 application_source_files = [
     'src/application/main.rs', # Must be listed first (see below).
+    'src/application/uart0.rs',
 ]
 
 application_env = env.Clone()
diff --git a/src/application/main.rs b/src/application/main.rs
index e14c8f0..dffa4ee 100644
--- a/src/application/main.rs
+++ b/src/application/main.rs
@@ -27,6 +27,8 @@
 
 extern crate common;
 
+mod uart0;
+
 use common::buffer::Buffer;
 use common::clock;
 use common::systick;
diff --git a/src/application/uart0.rs b/src/application/uart0.rs
new file mode 100644
index 0000000..2c61b83
--- /dev/null
+++ b/src/application/uart0.rs
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2019 Tilman Sauerbeck (tilman at code-monkey de)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+use common::uart;
+use common::ringbuf::Ringbuf;
+
+extern {
+    static mut uart0_rx_buf : Ringbuf;
+}
+
+#[no_mangle]
+pub unsafe extern fn UART0_IRQHandler() {
+    if let Some(received) = uart::try_read(uart::UART0) {
+        if !uart0_rx_buf.is_full() {
+            uart0_rx_buf.write(received);
+        }
+    }
+}
diff --git a/src/common/uart0.c b/src/common/uart0.c
new file mode 100644
index 0000000..2a983eb
--- /dev/null
+++ b/src/common/uart0.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2019 Tilman Sauerbeck (tilman at code-monkey de)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdint.h>
+
+#include "ringbuf.h"
+
+static uint8_t uart0_rx_buf_space[1 << 8];
+
+struct ringbuf uart0_rx_buf =
+	RINGBUF_INIT (uart0_rx_buf_space, sizeof (uart0_rx_buf_space));
-- 
2.30.2