From d088a11bf7c257ba45bf0c37a41e5038b302bc44 Mon Sep 17 00:00:00 2001 From: Josh Blum Date: Wed, 10 Feb 2010 11:57:58 -0800 Subject: Copied a snapshot of the usrp2 firmware into the microblaze firmware directory in the uhd repo. Added erllc copyrights to the files created and modified at erllc. --- firmware/microblaze/lib/lsadc.c | 73 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 firmware/microblaze/lib/lsadc.c (limited to 'firmware/microblaze/lib/lsadc.c') diff --git a/firmware/microblaze/lib/lsadc.c b/firmware/microblaze/lib/lsadc.c new file mode 100644 index 000000000..7983552e7 --- /dev/null +++ b/firmware/microblaze/lib/lsadc.c @@ -0,0 +1,73 @@ +/* -*- c++ -*- */ +/* + * Copyright 2008 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 . + */ + +#include "lsadc.h" +#include "spi.h" +#include "memory_map.h" + + +// AD9712 or AD7922 1 MS/s, 10-/12-bit ADCs + +//#define SPI_SS_DEBUG SPI_SS_RX_DB +#define SPI_SS_DEBUG 0 + + +void +lsadc_init(void) +{ + // nop +} + +/* + * The ADC's are pipelined. That is, you have to tell them + * which of the two inputs you want one cycle ahead of time. + * We could optimize and keep track of which one we used last + * time, but for simplicity we'll always tell it which + * one we want. This takes 2 16-bit xfers, one to set the + * input and one to read the one we want. + */ + +int +_lsadc_read(int which_adc, int slave_select) +{ + uint32_t r; + int channel = which_adc & 0x1; + + // Set CHN and STY equal to channel number. We don't want "daisy chain mode" + uint16_t cmd = (channel << 13) | (channel << 12); + + spi_transact(SPI_TXONLY, slave_select | SPI_SS_DEBUG, + cmd, 16, SPIF_PUSH_RISE | SPIF_LATCH_RISE); + + r = spi_transact(SPI_TXRX, slave_select | SPI_SS_DEBUG, + cmd, 16, SPIF_PUSH_RISE | SPIF_LATCH_RISE); + + return r & 0x0fff; +} + +int +lsadc_read_rx(int which_adc) +{ + return _lsadc_read(which_adc, SPI_SS_RX_ADC); +} + +int +lsadc_read_tx(int which_adc) +{ + return _lsadc_read(which_adc, SPI_SS_TX_ADC); +} -- cgit v1.2.3