From 25e971278f1433ea161fc69b2648ad3bbef390af Mon Sep 17 00:00:00 2001
From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Sat, 6 Jul 2019 18:17:43 +0200
Subject: [PATCH] common: Add the gpio module.

---
 SConscript.libcommon |  1 +
 src/common/gpio.rs   | 74 ++++++++++++++++++++++++++++++++++++++++++++
 src/common/lib.rs    |  1 +
 3 files changed, 76 insertions(+)
 create mode 100644 src/common/gpio.rs

diff --git a/SConscript.libcommon b/SConscript.libcommon
index 158205f..a8534c8 100644
--- a/SConscript.libcommon
+++ b/SConscript.libcommon
@@ -8,6 +8,7 @@ source_files_rs = [
     'src/common/clock.rs',
     'src/common/systick.rs',
     'src/common/port.rs',
+    'src/common/gpio.rs',
     'src/common/crc32.rs',
     'src/common/buffer.rs',
     'src/common/usb_serial.rs',
diff --git a/src/common/gpio.rs b/src/common/gpio.rs
new file mode 100644
index 0000000..6f6dd3d
--- /dev/null
+++ b/src/common/gpio.rs
@@ -0,0 +1,74 @@
+/*
+ * 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 register;
+
+type Reg32 = register::Register<u32>;
+
+const GPIO_BASE: u32 = 0x400ff000;
+
+pub const GPIOA: u32 = GPIO_BASE + 0x000;
+pub const GPIOB: u32 = GPIO_BASE + 0x040;
+pub const GPIOC: u32 = GPIO_BASE + 0x080;
+pub const GPIOD: u32 = GPIO_BASE + 0x0c0;
+pub const GPIOE: u32 = GPIO_BASE + 0x100;
+
+pub enum Direction {
+    Input,
+    Output
+}
+
+const GPIO_PSOR: u32 = 0x04;
+const GPIO_PCOR: u32 = 0x08;
+const GPIO_PTOR: u32 = 0x0c;
+const GPIO_PDIR: u32 = 0x10;
+const GPIO_PDDR: u32 = 0x14;
+
+pub fn set(gpio: u32, pin_mask: u32) {
+    Reg32::new(gpio + GPIO_PSOR).write(pin_mask);
+}
+
+pub fn clear(gpio: u32, pin_mask: u32) {
+    Reg32::new(gpio + GPIO_PCOR).write(pin_mask);
+}
+
+pub fn toggle(gpio: u32, pin_mask: u32) {
+    Reg32::new(gpio + GPIO_PTOR).write(pin_mask);
+}
+
+pub fn set_direction(gpio: u32, pin_mask: u32, direction: Direction) {
+    let mut pddr = Reg32::new(gpio + GPIO_PDDR);
+
+    match direction {
+        Direction::Output => {
+            pddr.modify(|v| v | pin_mask);
+        },
+        Direction::Input => {
+            pddr.modify(|v| v & !pin_mask);
+        }
+    }
+}
+
+pub fn get(gpio: u32) -> u32 {
+    Reg32::new(gpio + GPIO_PDIR).read()
+}
diff --git a/src/common/lib.rs b/src/common/lib.rs
index 17a3587..7828fea 100644
--- a/src/common/lib.rs
+++ b/src/common/lib.rs
@@ -30,6 +30,7 @@ pub mod nvic;
 pub mod clock;
 pub mod systick;
 pub mod port;
+pub mod gpio;
 pub mod crc32;
 pub mod buffer;
 pub mod usb_serial;
-- 
2.30.2