mirror of
https://libwebsockets.org/repo/libwebsockets
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94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
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* Generic SPI
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*
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* Copyright (C) 2019 - 2022 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <libwebsockets.h>
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int
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lws_spi_table_issue(const lws_spi_ops_t *spi_ops, uint32_t flags,
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const uint8_t *p, size_t len)
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{
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lws_spi_desc_t desc;
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size_t pos = 0;
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memset(&desc, 0, sizeof(desc));
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desc.count_cmd = 1;
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desc.flags = flags;
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while (pos < len) {
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desc.count_write = p[pos++];
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desc.src = (uint8_t *)&p[pos++];
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if (desc.count_write)
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desc.data = (uint8_t *)&p[pos];
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else
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desc.data = NULL;
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if (spi_ops->queue(spi_ops, &desc) != ESP_OK) {
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lwsl_err("%s: unable to queue\n", __func__);
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return 1;
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}
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pos += desc.count_write;
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}
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return 0;
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}
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int
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lws_spi_readback(const lws_spi_ops_t *spi_ops, uint32_t flags,
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const uint8_t *p, size_t len, uint8_t *rb, size_t rb_len)
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{
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lws_spi_desc_t desc;
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size_t pos = 0;
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memset(&desc, 0, sizeof(desc));
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desc.count_cmd = 1;
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desc.flags = flags;
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while (pos < len) {
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desc.count_write = p[pos++];
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desc.src = (uint8_t *)&p[pos++];
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if (desc.count_write)
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desc.data = (uint8_t *)&p[pos];
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else
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desc.data = NULL;
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desc.dest = rb;
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desc.count_read = rb_len;
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if (spi_ops->queue(spi_ops, &desc) != ESP_OK) {
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lwsl_err("%s: unable to queue\n", __func__);
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return 1;
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}
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pos += desc.count_write;
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}
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return 0;
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}
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