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/* -*- c++ -*- */
/*
* Copyright 2004 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_USRP_SPI_DEFS_H
#define INCLUDED_USRP_SPI_DEFS_H
/*
* defines for the VRQ_SPI_READ and VRQ_SPI_WRITE commands
*
* SPI == "Serial Port Interface". SPI is a 3 wire bus plus a
* separate enable for each peripheral. The common lines are SCLK,
* SDI and SDO. The FX2 always drives SCLK and SDI, the clock and
* data lines from the FX2 to the peripheral. When enabled, a
* peripheral may drive SDO, the data line from the peripheral to the
* FX2.
*
* The SPI_READ and SPI_WRITE commands are formatted identically.
* Each specifies which peripherals to enable, whether the bits should
* be transmistted Most Significant Bit first or Least Significant Bit
* first, the number of bytes in the optional header, and the number
* of bytes to read or write in the body.
*
* The body is limited to 64 bytes. The optional header may contain
* 0, 1 or 2 bytes. For an SPI_WRITE, the header bytes are
* transmitted to the peripheral followed by the the body bytes. For
* an SPI_READ, the header bytes are transmitted to the peripheral,
* then len bytes are read back from the peripheral.
*/
/*
* SPI_FMT_* goes in wIndexL
*/
#define SPI_FMT_xSB_MASK (1 << 7)
# define SPI_FMT_LSB (1 << 7) // least signficant bit first
# define SPI_FMT_MSB (0 << 7) // most significant bit first
#define SPI_FMT_HDR_MASK (3 << 5)
# define SPI_FMT_HDR_0 (0 << 5) // 0 header bytes
# define SPI_FMT_HDR_1 (1 << 5) // 1 header byte
# define SPI_FMT_HDR_2 (2 << 5) // 2 header bytes
/*
* SPI_ENABLE_* goes in wIndexH
*
* For the software interface, the enables are active high.
* For reads, it's an error to have more than one enable set.
*
* [FWIW, the hardware implements them as active low. Don't change the
* definitions of these. They are related to usrp_rev1_regs.h]
*/
#define SPI_ENABLE_FPGA 0x01 // select FPGA
#define SPI_ENABLE_CODEC_A 0x02 // select AD9862 A
#define SPI_ENABLE_CODEC_B 0x04 // select AD9862 B
#define SPI_ENABLE_reserved 0x08
#define SPI_ENABLE_TX_A 0x10 // select d'board TX A
#define SPI_ENABLE_RX_A 0x20 // select d'board RX A
#define SPI_ENABLE_TX_B 0x40 // select d'board TX B
#define SPI_ENABLE_RX_B 0x80 // select d'board RX B
/*
* If there's one header byte, it goes in wValueL.
*
* If there are two header bytes, they go in wValueH | wValueL.
* The transmit order of the bytes (and bits within them) is
* determined by SPI_FMT_*SB
*/
#endif /* INCLUDED_USRP_SPI_DEFS_H */
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