123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2009 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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*
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* \brief SIPO Module
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*
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* The SIPO module transforms a serial input in a parallel output. Please check hw_sipo.h
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* file to customize hardware related parameters.
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*
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* \author Andrea Grandi <andrea@develer.com>
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* \author Daniele Basile <asterix@develer.com>
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*/
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#include "sipo.h"
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#include "hw/hw_sipo.h"
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#include <cfg/compiler.h>
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#include <cfg/log.h>
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#include <io/kfile.h>
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#include <string.h>
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#define SIPO_DATAORDER_START(order) (order ? SIPO_DATAORDER_START_LSB : SIPO_DATAORDER_START_MSB)
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#define SIPO_DATAORDER_SHIFT(shift, order) (order ? ((shift) <<= 1) : ((shift) >>= 1))
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/**
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* Write a char in sipo shift register
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*/
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INLINE void sipo_putchar(uint8_t c, uint8_t bit_order, uint8_t clock_pol)
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{
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uint8_t shift = SIPO_DATAORDER_START(bit_order);
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for(int i = 0; i < 8; i++)
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{
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if((c & shift) == 0)
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SIPO_SI_LOW();
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else
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SIPO_SI_HIGH();
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SIPO_SI_CLOCK(clock_pol);
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SIPO_DATAORDER_SHIFT(shift, bit_order);
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}
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}
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/**
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* Write a buffer into the sipo register and, when finished, give a load pulse.
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*/
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static size_t sipo_write(struct KFile *_fd, const void *_buf, size_t size)
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{
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const uint8_t *buf = (const uint8_t *)_buf;
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Sipo *fd = SIPO_CAST(_fd);
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size_t write_len = size;
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ASSERT(buf);
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SIPO_SET_SI_LEVEL();
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SIPO_SET_CLK_LEVEL(fd->clock_pol);
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SIPO_SET_LD_LEVEL(fd->load_device, fd->load_pol);
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// Load into the shift register all the buffer bytes
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while(size--)
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sipo_putchar(*buf++, fd->bit_order, fd->clock_pol);
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// We finsh to load bytes, so load it.
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SIPO_LOAD(fd->load_device, fd->load_pol);
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return write_len;
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}
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/**
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* Initialize the SIPO
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*/
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void sipo_init(Sipo *fd)
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{
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ASSERT(fd);
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memset(fd, 0, sizeof(Sipo));
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//Set kfile struct type as a generic kfile structure.
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DB(fd->fd._type = KFT_SIPO);
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// Set up SIPO writing functions.
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fd->fd.write = sipo_write;
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SIPO_INIT_PIN();
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/* Enable sipo output */
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SIPO_ENABLE();
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}
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