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Add crc32 validation of received frames

daktil_thumb_popravljen
Fred Sundvik 2016-02-14 21:13:16 +02:00
parent a3ec3bbef8
commit 62058329ff
2 changed files with 43 additions and 1 deletions
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9
serial_link/protocol/frame_validator.c
View File

@ -23,6 +23,7 @@ SOFTWARE.
*/
#include "protocol/frame_validator.h"
#include "protocol/frame_router.h"
const uint32_t poly8_lookup[256] =
{
@ -101,5 +102,11 @@ static uint32_t crc32_byte(uint8_t *p, uint32_t bytelength)
}
void recv_frame(uint8_t* data, uint16_t size) {
if (size > 4) {
uint32_t frame_crc = *(uint32_t*)(data + size - 4);
uint32_t expected_crc = crc32_byte(data, size - 4);
if (frame_crc == expected_crc) {
route_frame(data, size-4);
}
}
}

35
serial_link/tests/frame_validator_tests.c
View File

@ -42,3 +42,38 @@ Ensure(FrameValidator, doesnt_validate_frames_under_5_bytes) {
recv_frame(data, 3);
recv_frame(data, 4);
}
Ensure(FrameValidator, validates_one_byte_frame_with_correct_crc) {
uint8_t data[] = {0x44, 0x04, 0x6A, 0xB3, 0xA3};
expect(route_frame,
when(size, is_equal_to(1)),
when(data, is_equal_to_contents_of(data, 1))
);
recv_frame(data, 5);
}
Ensure(FrameValidator, does_not_validate_one_byte_frame_with_incorrect_crc) {
uint8_t data[] = {0x44, 0, 0, 0, 0};
never_expect(route_frame);
recv_frame(data, 5);
}
Ensure(FrameValidator, validates_four_byte_frame_with_correct_crc) {
uint8_t data[] = {0x44, 0x10, 0xFF, 0x00, 0x74, 0x4E, 0x30, 0xBA};
expect(route_frame,
when(size, is_equal_to(4)),
when(data, is_equal_to_contents_of(data, 4))
);
recv_frame(data, 8);
}
Ensure(FrameValidator, validates_five_byte_frame_with_correct_crc) {
//0xBA304E74
//0x470B99F4
uint8_t data[] = {1, 2, 3, 4, 5, 0xF4, 0x99, 0x0B, 0x47};
expect(route_frame,
when(size, is_equal_to(5)),
when(data, is_equal_to_contents_of(data, 5))
);
recv_frame(data, 9);
}