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authorGiovanni Di Sirio <gdisirio@gmail.com>2019-01-21 19:42:49 +0000
committerGiovanni Di Sirio <gdisirio@gmail.com>2019-01-21 19:42:49 +0000
commita3e9966359c432405c8ab1eb49a27133e5271ba2 (patch)
tree03216e3986c61339f7ca9ad4c03671b6438a4b27 /os/hal/dox/uart.dox
parent5a41bbc5e100fc1e946702a046f0802e625a8de5 (diff)
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More renaming for consistency.
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@12571 110e8d01-0319-4d1e-a829-52ad28d1bb01
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-/*
- ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
-
- Licensed 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.
-*/
-
-/**
- * @defgroup UART UART Driver
- * @brief Generic UART Driver.
- * @details This driver abstracts a generic UART (Universal Asynchronous
- * Receiver Transmitter) peripheral, the API is designed to be:
- * - Unbuffered and copy-less, transfers are always directly performed
- * from/to the application-level buffers without extra copy
- * operations.
- * - Asynchronous, the API is always non blocking.
- * - Callbacks capable, operations completion and other events are
- * notified using callbacks.
- * .
- * Special hardware features like deep hardware buffers, DMA transfers
- * are hidden to the user but fully supportable by the low level
- * implementations.<br>
- * This driver model is best used where communication events are
- * meant to drive an higher level state machine, as example:
- * - RS485 drivers.
- * - Multipoint network drivers.
- * - Serial protocol decoders.
- * .
- * If your application requires a synchronous buffered driver then
- * the @ref SERIAL should be used instead.
- * @pre In order to use the UART driver the @p HAL_USE_UART option
- * must be enabled in @p halconf.h.
- *
- * @section uart_1 Driver State Machine
- * The driver implements a state machine internally, not all the driver
- * functionalities can be used in any moment, any transition not explicitly
- * shown in the following diagram has to be considered an error and shall
- * be captured by an assertion (if enabled).
- * @dot
- digraph example {
- rankdir="LR";
- node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
- edge [fontname=Helvetica, fontsize=8];
-
- uninit [label="UART_UNINIT", style="bold"];
- stop [label="UART_STOP\nLow Power"];
- ready [label="UART_READY\nClock Enabled"];
-
- uninit -> stop [label="\nuartInit()"];
- stop -> ready [label="\nuartStart()"];
- ready -> ready [label="\nuartStart()"];
- ready -> stop [label="\nuartStop()"];
- stop -> stop [label="\nuartStop()"];
- }
- * @enddot
- *
- * @subsection uart_1_1 Transmitter sub State Machine
- * The follow diagram describes the transmitter state machine, this diagram
- * is valid while the driver is in the @p UART_READY state. This state
- * machine is automatically reset to the @p TX_IDLE state each time the
- * driver enters the @p UART_READY state.
- * @dot
- digraph example {
- rankdir="LR";
- node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
- edge [fontname=Helvetica, fontsize=8];
-
- tx_idle [label="TX_IDLE", style="bold"];
- tx_active [label="TX_ACTIVE"];
- tx_complete [label="TX_COMPLETE"];
-
- tx_idle -> tx_active [label="\nuartStartSend()"];
- tx_idle -> tx_idle [label="\nuartStopSend()\n>txend2_cb<"];
- tx_active -> tx_complete [label="\nbuffer transmitted\n>txend1_cb<"];
- tx_active -> tx_idle [label="\nuartStopSend()"];
- tx_complete -> tx_active [label="\nuartStartSendI()\nthen\ncallback return"];
- tx_complete -> tx_idle [label="\ncallback return"];
- }
- * @enddot
- *
- * @subsection uart_1_2 Receiver sub State Machine
- * The follow diagram describes the receiver state machine, this diagram
- * is valid while the driver is in the @p UART_READY state. This state
- * machine is automatically reset to the @p RX_IDLE state each time the
- * driver enters the @p UART_READY state.
- * @dot
- digraph example {
- rankdir="LR";
- node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
- edge [fontname=Helvetica, fontsize=8];
-
- rx_idle [label="RX_IDLE", style="bold"];
- rx_active [label="RX_ACTIVE"];
- rx_complete [label="RX_COMPLETE"];
-
- rx_idle -> rx_idle [label="\nuartStopReceive()\n>rxchar_cb<\n>rxerr_cb<"];
- rx_idle -> rx_active [label="\nuartStartReceive()"];
-
- rx_active -> rx_complete [label="\nbuffer filled\n>rxend_cb<"];
- rx_active -> rx_idle [label="\nuartStopReceive()"];
- rx_active -> rx_active [label="\nreceive error\n>rxerr_cb<"];
- rx_complete -> rx_active [label="\nuartStartReceiveI()"];
- rx_complete -> rx_idle [label="\ncallback return"];
- }
- * @enddot
- *
- * @ingroup HAL_NORMAL_DRIVERS
- */