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a3a2dbd634
PIOS SPI devices may now make use of automatic CRC generation
and checking on block transfers. Only supports CRC8 for now.
Since the SPI interface CRC calculation continues across message
boundaries (ie. not reset on every transfer), we must manually reset
the CRC registers for every transfer to allow the two sides of the
link to resynchronize.
Unfortunately, resetting the CRC registers requires disabling the
SPI peripheral which must now be done on every block transfer.
Note: The last byte of the tx buffer is never sent and is assumed to
be a place holder for the tx CRC8.
Note: The last byte of the rx buffer is expected to hold the rx CRC8.
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@1011 ebee16cc-31ac-478f-84a7-5cbb03baadba
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/**
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******************************************************************************
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*
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* @file pios_spi_priv.h
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* Parts by Thorsten Klose (tk@midibox.org)
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* @brief SPI private definitions.
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program 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 3 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PIOS_SPI_PRIV_H
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#define PIOS_SPI_PRIV_H
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#include <pios.h>
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#include <pios_stm32.h>
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struct pios_spi_cfg {
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SPI_TypeDef * regs;
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SPI_InitTypeDef init;
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bool use_crc;
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struct stm32_dma dma;
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struct stm32_gpio ssel;
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struct stm32_gpio sclk;
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struct stm32_gpio miso;
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struct stm32_gpio mosi;
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};
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struct pios_spi_dev {
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const struct pios_spi_cfg * const cfg;
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void (*callback)(uint8_t, uint8_t);
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uint8_t tx_dummy_byte;
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uint8_t rx_dummy_byte;
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};
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extern struct pios_spi_dev pios_spi_devs[];
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extern uint8_t pios_spi_num_devices;
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#endif /* PIOS_SPI_PRIV_H */
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