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Mutiple frame handling for byte stuffer

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Also handles unexpected data.
This commit is contained in:
Fred Sundvik 2016-02-14 14:25:54 +02:00
parent ce3a21cbea
commit eefb5b5634
2 changed files with 63 additions and 2 deletions
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10
serial_link/protocol/byte_stuffer.c
View File

@ -41,6 +41,7 @@ void init_byte_stuffer_state(byte_stuffer_state_t* state) {
}
void recv_byte(byte_stuffer_state_t* state, uint8_t data) {
// Start of a new frame
if (state->next_zero == 0) {
state->next_zero = data;
state->data_pos = 0;
@ -49,10 +50,19 @@ void recv_byte(byte_stuffer_state_t* state, uint8_t data) {
state->next_zero--;
if (data == 0) {
if (state->next_zero == 0) {
// The frame is completed
recv_frame(state->data, state->data_pos);
}
else {
// The frame is invalid, so reset
state->next_zero = 0;
state->data_pos = 0;
}
}
else {
if (state->next_zero == 0) {
// Special case for zeroes
state->next_zero = data;
state->data[state->data_pos++] = 0;
}

53
serial_link/tests/byte_stuffer_tests.c
View File

@ -72,7 +72,7 @@ Ensure(ByteStuffer, receives_three_bytes_valid_frame) {
when(size, is_equal_to(3)),
when(data, is_equal_to_contents_of(expected, 3))
);
recv_byte(&state, 5);
recv_byte(&state, 4);
recv_byte(&state, 0x37);
recv_byte(&state, 0x99);
recv_byte(&state, 0xFF);
@ -103,3 +103,54 @@ Ensure(ByteStuffer, receives_valid_frame_with_zeroes) {
recv_byte(&state, 1);
recv_byte(&state, 0);
}
Ensure(ByteStuffer, receives_two_valid_frames) {
uint8_t expected1[] = {5, 0};
uint8_t expected2[] = {3};
expect(recv_frame,
when(size, is_equal_to(2)),
when(data, is_equal_to_contents_of(expected1, 2))
);
expect(recv_frame,
when(size, is_equal_to(1)),
when(data, is_equal_to_contents_of(expected2, 1))
);
recv_byte(&state, 2);
recv_byte(&state, 5);
recv_byte(&state, 1);
recv_byte(&state, 0);
recv_byte(&state, 2);
recv_byte(&state, 3);
recv_byte(&state, 0);
}
Ensure(ByteStuffer, receives_valid_frame_after_unexpected_zero) {
uint8_t expected[] = {5, 7};
expect(recv_frame,
when(size, is_equal_to(2)),
when(data, is_equal_to_contents_of(expected, 2))
);
recv_byte(&state, 3);
recv_byte(&state, 1);
recv_byte(&state, 0);
recv_byte(&state, 3);
recv_byte(&state, 5);
recv_byte(&state, 7);
recv_byte(&state, 0);
}
Ensure(ByteStuffer, receives_valid_frame_after_unexpected_non_zero) {
uint8_t expected[] = {5, 7};
expect(recv_frame,
when(size, is_equal_to(2)),
when(data, is_equal_to_contents_of(expected, 2))
);
recv_byte(&state, 2);
recv_byte(&state, 9);
recv_byte(&state, 4); // This should have been zero
recv_byte(&state, 0);
recv_byte(&state, 3);
recv_byte(&state, 5);
recv_byte(&state, 7);
recv_byte(&state, 0);
}