Hi, Nordic
Recently, I'm experimenting with the queue library.
I found some strange problems:
1. When the data types of my data structure members are not unique, using queue will cause the whole system to crash without even error codes
typedef struct {
bool flag;
uint8_t data1;
uint32_t data2;
uint8_t data3;
uint8_t data4;
uint8_t data5;
uint8_t data6;
} data_t;
NRF_QUEUE_DEF(data_t, m_data_queue, 255*sizeof(data_t), NRF_QUEUE_MODE_NO_OVERFLOW);
data_t test_data;
test_data.flag = true;
test_data.data1 = 0x01;
test_data.data2 = 0xAABBCC;
test_data.data3 = 0x03;
test_data.data4 = 0x04;
test_data.data5 = 0x05;
test_data.data6 = 0x06;
ret = nrf_queue_write(&m_data_queue, &test_data, sizeof(test_data));
APP_ERROR_CHECK(err_code);
data_t data_read;
ret = nrf_queue_read(&m_data_queue, &data_read, sizeof(data_read));
APP_ERROR_CHECK(err_code);
The whole system crashed before the program even performed error checking for queue writes
2. So I modified it according to other examples, as follows
typedef struct {
uint8_t data[9];
} data_t;
NRF_QUEUE_DEF(uint8_t, m_data_queue, 255*sizeof(data_t), NRF_QUEUE_MODE_NO_OVERFLOW);
data_t test_data;
test_data.data[0] = true;
test_data.data[1] = 0x01;
test_data.data[2] = 0xAA
test_data.data[3] = 0xBB;
test_data.data[4] = 0xCC;
test_data.data[5] = 0x03;
test_data.data[6] = 0x04;
test_data.data[7] = 0x05;
test_data.data[8] = 0x06;
ret = nrf_queue_write(&m_data_queue, &test_data.data, sizeof(test_data));
APP_ERROR_CHECK(err_code);
data_t data_read;
ret = nrf_queue_read(&m_data_queue, &data_read.data, sizeof(data_read));
APP_ERROR_CHECK(err_code);
My questions are as follows:
In 1, do I have any misunderstandings? If so, please point it out!!!
In 2, can I change the data type in NRF_QUEUE_DEF from uint8_t to data_t？
In 2, I have 255 groups of data. What should I do if I want to take the 3rd to 5th bytes (0xaabbcc) in each group of data as a condition for overwriting the data content of the queue? Is it necessary to perform queue reading to read all the contents in the queue, open up a space to compare each group of data, and then write all the updated contents to the queue again? Is there a more elegant way, such as specifying the write location of the queue or other ways?
Regards,
June6
