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Hanlde sending of zero bytes for small packets

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This commit is contained in:
Fred Sundvik 2016-02-14 18:59:01 +02:00
parent a089eaa868
commit f3beeb0270
2 changed files with 75 additions and 8 deletions
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27
serial_link/protocol/byte_stuffer.c
View file

@ -93,12 +93,31 @@ void recv_byte(byte_stuffer_state_t* state, uint8_t data) {
}
}
static void send_block(uint8_t* start, uint8_t* end, uint8_t num_non_zero) {
send_data(&num_non_zero, 1);
if (end > start) {
send_data(start, end-start);
}
}
void send_frame(uint8_t* data, uint16_t size) {
if (size > 0) {
uint8_t numZeroes = size + 1;
const uint8_t zero = 0;
send_data(&numZeroes, 1);
send_data(data, size);
if (size > 0) {
uint8_t num_non_zero = 1;
uint8_t* end = data + size;
uint8_t* start = data;
while (data < end) {
if (*data == 0) {
send_block(start, data, num_non_zero);
start = data + 1;
num_non_zero = 1;
}
else {
num_non_zero++;
}
++data;
}
send_block(start, data, num_non_zero);
send_data(&zero, 1);
}
}

56
serial_link/tests/byte_stuffer_tests.c
View file

@ -312,15 +312,63 @@ Ensure(ByteStuffer, send_zero_size_frame_does_nothing) {
Ensure(ByteStuffer, send_one_byte_frame) {
uint8_t data[] = {5};
send_frame(data, 1);
assert_that(sent_data_size, is_equal_to(3));
uint8_t expected[] = {2, 5, 0};
assert_that(sent_data, is_equal_to_contents_of(expected, 3));
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}
Ensure(ByteStuffer, send_two_byte_frame) {
uint8_t data[] = {5, 0x77};
send_frame(data, 2);
assert_that(sent_data_size, is_equal_to(4));
uint8_t expected[] = {3, 5, 0x77, 0};
assert_that(sent_data, is_equal_to_contents_of(expected, 4));
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}
Ensure(ByteStuffer, send_one_byte_frame_with_zero) {
uint8_t data[] = {0};
send_frame(data, 1);
uint8_t expected[] = {1, 1, 0};
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}
Ensure(ByteStuffer, send_two_byte_frame_starting_with_zero) {
uint8_t data[] = {0, 9};
send_frame(data, 2);
uint8_t expected[] = {1, 2, 9, 0};
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}
Ensure(ByteStuffer, send_two_byte_frame_starting_with_non_zero) {
uint8_t data[] = {9, 0};
send_frame(data, 2);
uint8_t expected[] = {2, 9, 1, 0};
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}
Ensure(ByteStuffer, send_three_byte_frame_zero_in_the_middle) {
uint8_t data[] = {9, 0, 0x68};
send_frame(data, 3);
uint8_t expected[] = {2, 9, 2, 0x68, 0};
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}
Ensure(ByteStuffer, send_three_byte_frame_data_in_the_middle) {
uint8_t data[] = {0, 0x55, 0};
send_frame(data, 3);
uint8_t expected[] = {1, 2, 0x55, 1, 0};
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}
Ensure(ByteStuffer, send_three_byte_frame_all_zeroes) {
uint8_t data[] = {0, 0, 0};
send_frame(data, 3);
uint8_t expected[] = {1, 1, 1, 1, 0};
assert_that(sent_data_size, is_equal_to(sizeof(expected)));
assert_that(sent_data, is_equal_to_contents_of(expected, sizeof(expected)));
}