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/*
* hal_io.c
* --------
* This module contains common code to talk to the FPGA over the bus du jour.
*
* Author: Paul Selkirk, Rob Austein
* Copyright (c) 2014-2017, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdint.h>
#include "hal.h"
#include "hal_internal.h"
#ifndef HAL_IO_TIMEOUT
#define HAL_IO_TIMEOUT 100000000
#endif
static inline hal_error_t test_status(const hal_core_t *core,
const uint8_t status,
int *done)
{
if (done == NULL)
return HAL_ERROR_IMPOSSIBLE;
if (*done || core == NULL)
return HAL_OK;
uint8_t buf[4];
const hal_error_t err = hal_io_read(core, ADDR_STATUS, buf, sizeof(buf));
if (err == HAL_OK)
*done = (buf[3] & status) != 0;
return err;
}
hal_error_t hal_io_wait2(const hal_core_t *core1,
const hal_core_t *core2,
const uint8_t status,
int *count)
{
int done1 = 0, done2 = 0;
hal_error_t err;
if (core1 == NULL)
return HAL_ERROR_BAD_ARGUMENTS;
if (core2 == NULL)
done2 = 1;
if (count && *count == -1)
*count = HAL_IO_TIMEOUT;
for (int i = 1; ; ++i) {
if (count && (*count > 0) && (i >= *count))
return HAL_ERROR_IO_TIMEOUT;
hal_task_yield();
if ((err = test_status(core1, status, &done1)) != HAL_OK ||
(err = test_status(core2, status, &done2)) != HAL_OK)
return err;
if (done1 && done2) {
if (count)
*count = i;
return HAL_OK;
}
}
}
hal_error_t hal_io_wait(const hal_core_t *core,
const uint8_t status,
int *count)
{
return hal_io_wait2(core, NULL, status, count);
}
/*
* Local variables:
* indent-tabs-mode: nil
* c-basic-offset: 2
* End:
*/
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