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/* -*- c++ -*- */
/*
* Copyright 2007 Free Software Foundation, Inc.
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ad9777.h"
#include "memory_map.h"
#include "spi.h"
#define IB_RD 0x80
#define IB_WR 0x00
#define IB_XFER_1 0x00
#define IB_XFER_2 0x20
#define IB_XFER_3 0x40
#define IB_XFER_4 0x60
#define IB_ADDR_MASK 0x1f
void
ad9777_write_reg(int regno, uint8_t value)
{
uint8_t instr = IB_WR | IB_XFER_1 | (regno & IB_ADDR_MASK);
spi_transact(SPI_TXONLY, SPI_SS_AD9777,
(instr << 8) | (value & 0xff), 16, SPIF_PUSH_FALL);
}
int
ad9777_read_reg(int regno)
{
uint8_t instr = IB_RD | IB_XFER_1 | (regno & IB_ADDR_MASK);
uint32_t r = spi_transact(SPI_TXRX, SPI_SS_AD9777,
(instr << 8) | 0, 16,
SPIF_PUSH_FALL | SPIF_LATCH_RISE);
return r & 0xff;
}
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