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https://github.com/saymrwulf/uhd.git
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55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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* Copyright 2012 Ettus Research LLC
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* Copyright 2007,2008 Free Software Foundation, Inc.
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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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "spi.h"
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#include "memory_map.h"
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#include "nonstdio.h"
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void spi_init(void)
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{
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spi_core->divider = 10;
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}
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void spi_wait(void)
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{
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while ((readback_mux->irqs & SPI_READY_IRQ) == 0){
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//NOP
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}
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}
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uint32_t spi_transact(bool readback, int slave, uint32_t data, int length, uint32_t flags)
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{
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uint32_t control_word = 0;
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control_word |= (slave << SPI_CORE_SLAVE_SELECT_SHIFT);
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control_word |= (length << SPI_CORE_NUM_BITS_SHIFT);
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if ((flags & SPI_PUSH_RISE) != 0) control_word |= (1 << SPI_CORE_DATA_OUT_EDGE_SHIFT);
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if ((flags & SPI_PUSH_FALL) != 0) control_word |= (0 << SPI_CORE_DATA_OUT_EDGE_SHIFT);
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if ((flags & SPI_LATCH_RISE) != 0) control_word |= (1 << SPI_CORE_DATA_IN_EDGE_SHIFT);
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if ((flags & SPI_LATCH_FALL) != 0) control_word |= (0 << SPI_CORE_DATA_IN_EDGE_SHIFT);
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const uint32_t data_out = data << (32 - length);
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spi_wait();
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spi_core->control = control_word;
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spi_core->data = data_out;
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if (!readback) return 0;
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spi_wait();
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return readback_mux->spi;
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}
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