uint8_t (C language - Type). uint8_t stores an 8-bit unsigned number, from 0 to 255. It is equal to unsigned char.
Questions tagged [uint8t]
272 questions
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votes
1 answer
array of uint8_t and append data
hi to all i have this problem i have a array of uint8_t
uint8_t command_Text[256]
i read some data from adc, i use snprintf for convert the data float in uint8_t
` float aux;
uint8_t value[4];
aux=(float)(HAL_ADC_GetValue(&hadc))
…
Ant
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3 answers
String assignment to uint8_t in c
I am trying to assign string to uint8_t buffer in IAR, but I get a warning message.
rx_buffer.rx_struct.RESP.RESPOND is struct field of uint8_t type.
My code is:
strncpy(rx_buffer.rx_struct.RESP.RESPOND, (uint8_t *)'NS,', 3);
And the associated…
Yaroslav Kirillov
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2 answers
How to copy uint8* to vector correctly
I am trying to make a vector of Uint8 from Uint8*, but for reason some of the values are not same. Here is my code.
std::vector wav_vector = {};
Uint8* wav_buffer_;
for (unsigned int i = 0; i < wav_length_; i++) {
…
aak
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2 answers
convert long int > 255 into a uint8_t array
I'm working with Particle Photon microcontroller and need to send a value >> 255 via TCP. I would need to convert this into an array of uint8_t so that I can use the client.write((int8_t *data), int sizeof(packet));
how can I achieve it?
Marco Datola
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votes
1 answer
writing float array as reversed bytes each
I am going to create the byte array as desired output using iOS objective-C. The method is converting from static float array to int8_t array bytes array . When it comes to the implementation, I have found that all bytes for each float in the float…
Jeff Bootsholz
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0 answers
Sign conversion error with std::uint32_t and std::uint8_t
I have a piece of code which assigns an 8-bit unsigned int (std::uint8_t) to a 32-bit unsigned int (std::uint32_t):
std::uint32_t a{0};
std::uint8_t b{1};
a = b << 16;
When I try to compile this with -Werror -Wsign-conversion -fsanitize=undefined,…
jjcasmar
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votes
2 answers
How to convert 32-bit binary value to int8_t array
I'm trying to covert a 32 bit binary value into int8_t array. I'm not sure how to do this, and I'm struggling to find any documentation explaining the process.
I was thinking that each 8 bits represents an integer, and then that's the array, but I'm…
user16030865
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3 answers
Why does my data is cut when I have 0x00?
I want to copy an uint8_t array to a uint8_t pointer
uint8_t temp_uint8_array[] = {0x15, 0x25, 0x32, 0x00, 0x52, 0xFD};
uint8_t* Buffer = temp_uint8_array;
And now :
Buffer = {0x15, 0x25, 0x32};
So I understand that my data is cut because of…
Clément
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votes
1 answer
Convert char* data to uint16_t* or uint16_t array in C
My Arduino program receives a char* text message like this:
char* messageFromWebSocket = "4692\n4408\n656\n358\n662\n356\n658\n376\n656\n358\n662\n1394\n660\n1392\n636\n378\n632\n382\n638\n1418";
Now the IRremoteESP8266 library I used controls the…
misza
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votes
1 answer
How to convert a uint8_t array to a character array in C?
I have a uint8_t array which I want to be able to convert to a char array.
i.e. uint_8 myInput [4] = {0, 233, 3, 1};
Which in bits it corresponds to: 00000000 00000011 11101001 00000001
And I would like to have an array of characters: char myChar…
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votes
1 answer
Bitwise operations performed on an 8 bit unsigned int
In the following code, bitwise operations are performed on an 8-bit unsigned integer.
uint8_t i = 10;
uint8_t j = i>>2;
In this example, i is promoted to a signed int and value assigned to 8 bits unsigned int. Is it safe to int converted back to 8…
msc
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1 answer
Map 10Bit buffer to 8Bit
I have a 10 bit SDI stream, when I receive it, it will be stored into uint8_t *buffer and off course when I read it I get completely different value from what expected, except for the first:
10Bit -> 00 0000 0001 | 00 0101 1010 → Hex: A5 10
8 Bit…
mattobob
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3 answers
Are uint8_t , uint16_t guaranteed to be of the 8 and 16 bits respectively?
I do a simulation and want to keep the memory cost down and hence using uint8_t , uint16_t for the class members. Does cpp guarantee that they will be of 8 and 16 bits ?
Is there an difference based on the architecture of the process that I should…
nnrales
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1 answer
Why doesn't uint8_t and int8_t work with file and console streams?
$ file testfile.txt
testfile.txt: ASCII text
$ cat testfile.txt
aaaabbbbccddef
#include
#include
#include
#include
typedef uint8_t byte; // <-------- interesting
typedef std::basic_ifstream…
user1358
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2 answers
Convert double to uint8_t*
I have a function that accepts uint8_t* which is supposed to be a string.
I want to send a double to this function.
I have tried this code below but it doesn't work.
double a = 10.98
uint8_t* p = (uint8_t*) &a;
printf("p: %u \n", p);…
xem
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