07272b7cd6
* Only enable TX by default. * Add some magic for RX handling. When an input handler is registered: * Automatically enable RX-related and interrupts * Automatically lock the SERIAL PD on under all power modes * Automatically enable the UART clock under sleep and deep sleep * Automatically undo all of the above when the input handler becomes NULL * As a result, modules / examples that need UART RX no longer need to clock the UART and manipulate the SERIAL PD. They simply have to specify an input handler * Don't automatically power on the UART whenever the CM3 is active * Before accessing the UART, make sure it is powered and clocked * Avoid falling edge glitches * Fix garbage characters / Explicitly wait for UART TX to complete
100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/*
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* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc26xx
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* @{
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*
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* \defgroup cc26xx-uart CC26xx UARTs
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*
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* Driver for the CC26xx UART controller
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* @{
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*
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* \file
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* Header file for the CC26xx UART driver
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*/
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#ifndef CC26XX_UART_H_
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#define CC26XX_UART_H_
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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/** \name UART functions
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* @{
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*/
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/**
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* \brief Initialises the UART controller, configures I/O control
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* and interrupts
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*/
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void cc26xx_uart_init();
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/**
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* \brief Sends a single character down the UART
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* \param b The character to transmit
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*/
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void cc26xx_uart_write_byte(uint8_t b);
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/**
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* \brief Assigns a callback to be called when the UART receives a byte
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* \param input A pointer to the function
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*
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* If \e input is NULL, the UART driver will assume that RX functionality is
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* not required and it will be disabled. It will also disable the module's
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* clocks under sleep and deep sleep and allow the SERIAL PD to be powered off.
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*
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* If \e input is not NULL, the UART driver will assume that RX is in fact
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* required and it will be enabled. The module's clocks will be enabled under
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* sleep and deep sleep and the driver will not allow the SERIAL PD to turn
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* off during deep sleep, so that the UART can still receive bytes.
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*
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* \note This has a significant impact on overall energy consumption, so you
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* should only enabled UART RX input when it's actually required.
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*/
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void cc26xx_uart_set_input(int (*input)(unsigned char c));
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/**
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* \brief Returns the UART busy status
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* \return UART_IDLE or UART_BUSY
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*
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* ti_lib_uart_busy() will access UART registers. It is our responsibility
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* to first make sure the UART is accessible before calling it. Hence this
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* wrapper.
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*
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* Return values are defined in CC26xxware's uart.h
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*/
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uint8_t cc26xx_uart_busy(void);
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/** @} */
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/*---------------------------------------------------------------------------*/
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#endif /* CC26XX_UART_H_ */
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/**
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* @}
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* @}
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*/
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