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Diffstat (limited to 'firmware/fx2/common/usrp_spi_defs.h')
| -rw-r--r-- | firmware/fx2/common/usrp_spi_defs.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/firmware/fx2/common/usrp_spi_defs.h b/firmware/fx2/common/usrp_spi_defs.h new file mode 100644 index 000000000..963463ef2 --- /dev/null +++ b/firmware/fx2/common/usrp_spi_defs.h @@ -0,0 +1,86 @@ +/* -*- 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 3, 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 */ |