I am trying to write a pice of code which send to a receiver the frequency to listen.

As per its documentation, it should receive the following sequence:

Example with 123.456 MHz

Command to send (frequency converted in 4 bytes, followed by 2 instruction bytes

0x12 0x23 0x56 0x00 0x01

To be able to memorize six frequencies, I fill an array:

uint32_t mem_freq[6] = {
 0x121050,
 0x126500,
 0x120500,
 0x121700,
 0x121825,
 0x118700,
};

My concern is that when I do :

Serial.write(mem_freq[mem_index]);
//Serial.write(0x00);
//Serial.write(0x01);

Only 1 byte is sent, and it's hard to debug as the serial console displays only ascii characters.

When I use Serial.print instead, mem_freq[2] shows correctly 0x120500

After Majenko's answer, I tried this:

Serial.print(0x123456 >> 16,HEX);
Serial.print(0x123456 >> 8,HEX);
Serial.print(0x123456,HEX);
Serial.print(0x00,HEX);
Serial.print(0x01,HEX);

And it outputs:

12123412345601

Is this normal ?

I am trying to write a pice of code which send to a receiver the frequency to listen.

As per its documentation, it should receive the following sequence:

Example with 123.456 MHz

Command to send (frequency converted in 4 bytes, followed by 2 instruction bytes

0x12 0x23 0x56 0x00 0x01

To be able to memorize six frequencies, I fill an array:

uint32_t mem_freq[6] = {
 0x121050,
 0x126500,
 0x120500,
 0x121700,
 0x121825,
 0x118700,
};

My concern is that when I do :

Serial.write(mem_freq[mem_index]);
//Serial.write(0x00);
//Serial.write(0x01);

Only 1 byte is sent, and it's hard to debug as the serial console displays only ascii characters.

When I use Serial.print instead, mem_freq[2] shows correctly 0x120500

After Majenko's answer, I tried this:

Serial.print(0x123456 >> 16,HEX);
Serial.print(0x123456 >> 8,HEX);
Serial.print(0x123456,HEX);
Serial.print(0x00,HEX);
Serial.print(0x01,HEX);

And it outputs:

12123412345601

Is this normal ?

I am trying to write a pice of code which send to a receiver the frequency to listen.

As per its documentation, it should receive the following sequence:

Example with 123.456 MHz

Command to send (frequency converted in 4 bytes, followed by 2 instruction bytes

0x12 0x23 0x56 0x00 0x01

To be able to memorize six frequencies, I fill an array:

uint32_t mem_freq[6] = {
 0x121050,
 0x126500,
 0x120500,
 0x121700,
 0x121825,
 0x118700,
};

My concern is that when I do :

Serial.write(mem_freq[mem_index]);
//Serial.write(0x00);
//Serial.write(0x01);

Only 1 byte is sent, and it's hard to debug as the serial console displays only ascii characters.

When I use Serial.print instead, mem_freq[2] shows correctly 0x120500

I am trying to write a pice of code which send to a receiver the frequency to listen.

As per its documentation, it should receive the following sequence:

Example with 123.456 MHz

Command to send (frequency converted in 4 bytes, followed by 2 instruction bytes

0x12 0x23 0x56 0x00 0x01

To be able to memorize six frequencies, I fill an array:

uint32_t mem_freq[6] = {
 0x121050,
 0x126500,
 0x120500,
 0x121700,
 0x121825,
 0x118700,
};

My concern is that when I do :

Serial.write(mem_freq[mem_index]);
//Serial.write(0x00);
//Serial.write(0x01);

Only 1 byte is sent, and it's hard to debug as the serial console displays only ascii characters.

When I use Serial.print instead, mem_freq[2] shows correctly 0x120500

After Majenko's answer, I tried this:

Serial.print(0x123456 >> 16,HEX);
Serial.print(0x123456 >> 8,HEX);
Serial.print(0x123456,HEX);
Serial.print(0x00,HEX);
Serial.print(0x01,HEX);

And it outputs:

12123412345601

Is this normal ?