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Send preprocessed tensorflow input over serial
Signed-off-by: Stefan Gloor <code@stefan-gloor.ch>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| /** | ||
| * @file serial.h | ||
| * @brief Simple serial protocol for transferring preprocessed input data | ||
| */ | ||
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| /* | ||
| * Copyright (C) 2024 Stefan Gloor | ||
| * | ||
| * SPDX-License-Identifier: MIT | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| * SOFTWARE. | ||
| * | ||
| * | ||
| */ | ||
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| #define SERIAL_BLOCK_SIZE 256 | ||
| #define SERIAL_CMD_START_TRANSACTION "START" | ||
| #define SERIAL_CMD_ACK "A" | ||
| #define SERIAL_CMD_NACK "N" | ||
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| /** | ||
| * @brief Receive up to len bytes | ||
| * @returns number of bytes received | ||
| * | ||
| */ | ||
| #ifdef __cplusplus | ||
| extern "C" | ||
| #endif | ||
| int serial_recv(char* buf, size_t len); | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /** | ||
| * @file serial.c | ||
| * @brief Simple serial protocol for transferring preprocessed input data | ||
| */ | ||
|
|
||
| /* | ||
| * Copyright (C) 2024 Stefan Gloor | ||
| * | ||
| * SPDX-License-Identifier: MIT | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| * SOFTWARE. | ||
| * | ||
| * | ||
| */ | ||
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| #include <stdlib.h> | ||
| #include <stddef.h> | ||
| #include <string.h> | ||
| #include <stdio.h> | ||
| #include <unistd.h> | ||
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| #include <serial.h> | ||
| #include <checksum.h> | ||
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| static uint32_t bytes_received = 0; | ||
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| int serial_recv(char* out, size_t len){ | ||
| int i = 0; | ||
| // Wait for transaction to start | ||
| do { | ||
| i += read(STDIN_FILENO, out+i, strlen(SERIAL_CMD_START_TRANSACTION)); | ||
| } while ((strstr(out, SERIAL_CMD_START_TRANSACTION) == NULL) && (i < len)); | ||
| if (i >= len - 1){ | ||
| write(STDOUT_FILENO, SERIAL_CMD_NACK, strlen(SERIAL_CMD_NACK)); | ||
| return 0; | ||
| } | ||
| // Send "START" back | ||
| write(STDOUT_FILENO, SERIAL_CMD_START_TRANSACTION, strlen(SERIAL_CMD_START_TRANSACTION)); | ||
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| // Send expected block size | ||
| char blocksize[5]; | ||
| snprintf(blocksize, sizeof(blocksize), "%04u", SERIAL_BLOCK_SIZE); | ||
| write(STDOUT_FILENO, blocksize, 4); | ||
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| // Receive file size | ||
| i = 0; | ||
| while (i < 8){ | ||
| i += read(STDIN_FILENO, out+i, 8-i); | ||
| } | ||
| out[8] = '\0'; | ||
| size_t filesize = atoi(out); | ||
| size_t rounded_filesize = (filesize + SERIAL_BLOCK_SIZE - 1) | ||
| / SERIAL_BLOCK_SIZE * SERIAL_BLOCK_SIZE; | ||
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| if ((rounded_filesize > len) || (filesize == 0)){ | ||
| write(STDOUT_FILENO, SERIAL_CMD_NACK, strlen(SERIAL_CMD_NACK)); | ||
| return 0; | ||
| } | ||
| write(STDOUT_FILENO, SERIAL_CMD_ACK, strlen(SERIAL_CMD_ACK)); | ||
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| // Receive data | ||
| bytes_received = 0; | ||
| unsigned char blockbuf[SERIAL_BLOCK_SIZE]; | ||
| do { | ||
| int j = 0; | ||
| char checksum[9]; | ||
| // 32 bit checksum first | ||
| while (j < 8){ | ||
| j += read(STDIN_FILENO, checksum+j, 1); | ||
| } | ||
| checksum[8] = '\0'; | ||
| uint32_t expected_crc32 = strtoll(checksum, NULL, 16); | ||
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| j = 0; | ||
| // actual data block | ||
| while (j < SERIAL_BLOCK_SIZE){ | ||
| size_t len = read(STDIN_FILENO, blockbuf+j, 1); | ||
| // An error occurred (e.g., timeout) | ||
| if (len == 0){ | ||
| break; | ||
| } | ||
| else { | ||
| j += len; | ||
| } | ||
| } | ||
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| if (crc_32(blockbuf, SERIAL_BLOCK_SIZE) == expected_crc32) { | ||
| write(STDOUT_FILENO, SERIAL_CMD_ACK, strlen(SERIAL_CMD_ACK)); | ||
| memcpy(out + bytes_received, blockbuf, SERIAL_BLOCK_SIZE); | ||
| bytes_received += SERIAL_BLOCK_SIZE; | ||
| } | ||
| else { | ||
| write(STDOUT_FILENO, SERIAL_CMD_NACK, strlen(SERIAL_CMD_NACK)); | ||
| } | ||
| } while (bytes_received < rounded_filesize); | ||
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| return bytes_received; | ||
| } |
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