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| -rw-r--r-- | hal_io.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/hal_io.c b/hal_io.c new file mode 100644 index 0000000..f885712 --- /dev/null +++ b/hal_io.c @@ -0,0 +1,114 @@ +/* + * 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: + */ |