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32 lines
710 B
32 lines
710 B
/*
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* command_interpreter.c
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*
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* Created on: Jul 10, 2021
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* Author: Andreas Berthoud
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*/
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#include "usbd_cdc_if.h"
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#include "commands.h"
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void usb_receive(uint8_t *buf, uint32_t *len) {
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if (*len < 5) {
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log_error("usb_receive", "received command which cannot be interpreted", 0);
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return;
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}
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uint8_t command_id = buf[0];
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uint16_t length = buf[1] << 8 | buf[2];
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uint8_t * payload_ptr = buf + 4;
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uint8_t stop_byte = 0x1;
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if (*len >= 4 + length) {
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stop_byte = buf[4+ length];
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}
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if (stop_byte != 0xFF) {
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log_error("usb_receive", "received command has invalid stop byte: 0x%x", 1, stop_byte);
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} else {
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handle_received_command(command_id, payload_ptr, length);
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}
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}
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