hw/mcu/da1469x: Add UART driver

Driver that shuts down UART when RX line goes low to minimize
power consumption.

Author: kasjer

hw/drivers/uart/uart_da1469x/include/uart_da1469x/uart_da1469x.h

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef __DRIVERS_UART_DA1469X_H_
+#define __DRIVERS_UART_DA1469X_H_
+
+#include "uart/uart.h"
+#include "mcu/da1469x_hal.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct da1469x_uart_hw_data;
+
+struct da1469x_uart_dev {
+    struct uart_dev dev;
+    /* Common UART parameters. */
+    struct uart_conf uc;
+    /* DA1469x specific configuration. */
+    struct da1469x_uart_cfg da1469x_cfg;
+
+    /* driver state data */
+    uint8_t active : 1;
+    uint8_t tx_started : 1;
+    uint8_t rx_started : 1;
+    uint8_t rx_stalled : 1;
+    uint8_t rx_data;
+
+    /* Callout used to re-enable UART after it RX pin went high. */
+    struct os_callout wakeup_callout;
+    /* Event raised from interrupt (busy/break) that will setup RX pin to GPIO with interrupt in task context. */
+    struct os_event setup_wakeup_event;
+    /* Hardware configuration, register addresses bit mask and such. */
+    const struct da1469x_uart_hw_data *hw;
+};
+
+/**
+ * Creates UART OS device
+ *
+ * @param dev - device structure to initialize
+ * @param name - device name (must end with character 0|1|2 like "uart0")
+ * @param priority - priority for os_dev_create
+ * @param da1469x_cfg - UART parameters
+ * @return 0 on success,
+ */
+int da1469x_uart_dev_create(struct da1469x_uart_dev *dev, const char *name, uint8_t priority,
+                            const struct da1469x_uart_cfg *da1469x_cfg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __DRIVERS_UART_DA1469X_H_ */

hw/drivers/uart/uart_da1469x/pkg.yml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+pkg.name: hw/drivers/uart/uart_da1469x
+pkg.description: UART driver for DA1469X
+pkg.author: "Apache Mynewt <[email protected]>"
+pkg.homepage: "http://mynewt.apache.org/"
+pkg.keywords:
+pkg.apis:
+pkg.deps:
+    - "@apache-mynewt-core/hw/hal"
+    - "@apache-mynewt-core/hw/drivers/uart"