Add UsartDriver (TX-only)

firmware/Bsp/Drivers/UsartDriver.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2019  Max Regan
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "Bsp/ReturnCode.h"
+#include "Bsp/TaskScheduler.h"
+
+#include "Mcu.h"
+
+namespace BSP {
+
+class UsartDriver : public BSP::Schedule::Task {
+
+public:
+    // TODO: Add configurability / provide a real abstraction
+    UsartDriver(USART_TypeDef *usart, BSP::Schedule::TaskScheduler &scheduler);
+
+    void init();
+    BSP::Schedule::NextTime execute() override;
+    BSP::ReturnCode tx_blocking(const uint8_t *data, size_t len);
+    BSP::ReturnCode tx_blocking(const char *data);
+
+private:
+    BSP::Schedule::TaskScheduler &m_scheduler;
+    USART_TypeDef *m_usart;
+};
+
+}