hackrf.h ### Example TX code utilizing the transfer and flush callbacks.

[smileyrekiere]

Compiling the Example TX code utilizing the transfer and flush callback that is in hackrf.h file, copied to another file rfgen_tx.c

There was a compile error when doing (note: possible fix below, others may run into this issue). If the fix is incorrect possibly understand why.

gcc -o rfgen_tx rfgen_tx.c -lm -lhackrf

rfgen_tx.c: In function ‘main’:
rfgen_tx.c:80:36: warning: passing argument 2 of ‘hackrf_enable_tx_flush’ from incompatible pointer type [-Wincompatible-pointer-types]
80 | hackrf_enable_tx_flush(device, flush_callback, NULL);
| ^~~~~~~~~~~~~~
| |
| void (*)(hackrf_transfer ) {aka void ()(struct )}
In file included from rfgen_tx.c:3:
/usr/local/include/libhackrf/hackrf.h:1150:21: note: expected ‘hackrf_flush_cb_fn’ {aka ‘void ()(void , int)’} but argument is of type ‘void ()(hackrf_transfer )’ {aka ‘void ()(struct *)’}
1150 | hackrf_flush_cb_fn callback,

Needed to change line
** void flush_callback(hackrf_transfer *transfer) { **

to:
void flush_callback(void * transfer, int success) {

to get the source to compile and run the file.

Verified the signal transmitted and debug printed

hackrf_open
hackrf_open_setup
libusb_get_configuration result: 0
hackrf_open_setup: set_hackrf_configuration result: 0
libusb_claim_interface result: 0
hackrf_set_freq
hackrf_set_txvga_gain
hackrf_enable_tx_flush
hackrf_close

Thank-you for the Code Example provided by :
// Transmit a 440Hz triangle wave through FM (144.5MHz) using the libhackrf API
// Copyright (c) 2022 László Baráth "Uncle Dino" HA7DN https://github.com/Sasszem

hackrf_info:
hackrf_info version: git-6211fbb0*
libhackrf version: git-6211fbb0* (0.8)
Found HackRF
Index: 0
Serial number: 000000000000000057b068dc22276763
hackrf_open_setup
libusb_get_configuration result: 0
hackrf_open_setup: set_hackrf_configuration result: 0
libusb_claim_interface result: 0
Board ID Number: 2 (HackRF One)
Firmware Version: 2023.01.1 (API:1.07)
Part ID Number: 0xa000cb3c 0x00644754
Hardware Revision: older than r6
Hardware supported by installed firmware:
HackRF One
hackrf_close

Host code also at 2023.

[zuckschwerdt]

This seems to be about HackRF?

Can you add information explaining: how is this linked to SoapySDR? What didn't work, and what (code, example, or wiki) needs to be fixed?

edit: indeed this references hackrf.h verbatim and does not concern SoapySDR. Closing.

[smileyrekiere]

@zuckschwerdt Thank-you for pointing out my error. I couldn't figure out why I couldn't find it in https://github.com/greatscottgadgets/hackrf/issues after I wrote it.