68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2012 LeafLabs, LLC.
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* Copyright (c) 2010 Perry Hung.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file libmaple/usart_private.h
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* @author Marti Bolivar <mbolivar@leaflabs.com>
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* @brief Private USART header.
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*/
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#ifndef _LIBMAPLE_USART_PRIVATE_H_
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#define _LIBMAPLE_USART_PRIVATE_H_
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#include <libmaple/ring_buffer.h>
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#include <libmaple/usart.h>
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static inline __always_inline void usart_irq(ring_buffer *rb, ring_buffer *wb, usart_reg_map *regs) {
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/* Handling RXNEIE and TXEIE interrupts.
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* RXNE signifies availability of a byte in DR.
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*
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* See table 198 (sec 27.4, p809) in STM document RM0008 rev 15.
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* We enable RXNEIE. */
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if ((regs->CR1 & USART_CR1_RXNEIE) && (regs->SR & USART_SR_RXNE)) {
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#ifdef USART_SAFE_INSERT
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/* If the buffer is full and the user defines USART_SAFE_INSERT,
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* ignore new bytes. */
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rb_safe_insert(rb, (uint8)regs->DR);
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#else
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/* By default, push bytes around in the ring buffer. */
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rb_push_insert(rb, (uint8)regs->DR);
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#endif
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}
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/* TXE signifies readiness to send a byte to DR. */
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if ((regs->CR1 & USART_CR1_TXEIE) && (regs->SR & USART_SR_TXE)) {
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if (!rb_is_empty(wb))
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regs->DR=rb_remove(wb);
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else
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regs->CR1 &= ~((uint32)USART_CR1_TXEIE); // disable TXEIE
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}
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}
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uint32 _usart_clock_freq(usart_dev *dev);
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#endif
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