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/******************************************************************************
* The MIT License
*
* Copyright (c) 2012 LeafLabs, LLC.
* Copyright (c) 2010 Perry Hung.
*
* 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.
*****************************************************************************/
/**
* @file libmaple/usart_private.h
* @author Marti Bolivar <mbolivar@leaflabs.com>
* @brief Private USART header.
*/
#ifndef _LIBMAPLE_USART_PRIVATE_H_
#define _LIBMAPLE_USART_PRIVATE_H_
#include <libmaple/ring_buffer.h>
#include <libmaple/usart.h>
static __always_inline void usart_irq(ring_buffer *rb, usart_reg_map *regs) {
/* We can get RXNE and ORE interrupts here. Only RXNE signifies
* availability of a byte in DR.
*
* See table 198 (sec 27.4, p809) in STM document RM0008 rev 15.
* We enable RXNEIE. */
if (regs->SR & USART_SR_RXNE) {
#ifdef USART_SAFE_INSERT
/* If the buffer is full and the user defines USART_SAFE_INSERT,
* ignore new bytes. */
rb_safe_insert(rb, (uint8)regs->DR);
#else
/* By default, push bytes around in the ring buffer. */
rb_push_insert(rb, (uint8)regs->DR);
#endif
}
}
uint32 _usart_clock_freq(usart_dev *dev);
#endif
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