Joan,
Seem like there seem some race/buffer-overwrite issue in consuming the bcs_xfer buffer even while linking with local pigpio library.
it would be helpful for community if you have any equivalent C/C++ code of bsc_slave.py (like pi.i2c_bsc() example using "int eventSetFuncEx(unsigned event, eventFuncEx_t f, void *userdata)".
Is it possible to add a API bsc_read(), bsc_write(), which can callback-api returning the same full transaction (as that like I2C_sniffer.py) from a START to STOP instead of 16-byte buffer.
after trying C code - I see that the bytes after every 32 bytes seem to not show 5 bytes. Please let me know if any bad call to pigpio API.
Code: Select all
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pigpio.h>
#define DATASZ 2048
#define SELFADDR
void simple_bsc_event_callback(int event, uint32_t tick) {
bsc_xfer_t xfer;
int i = 0, status;
xfer.control = (SELFADDR << 16) | 0x305;
status = bscXfer(&xfer);
if (! status ) {
fprintf(stderr, "process register failed.\n");
}
if (xfer.rxCnt){
for (i=0; i<xfer.rxCnt; i++)
fprintf(stderr, " %02x", xfer.rxBuf[i]);
fprintf(stderr, "\n");
}
}
int main(int argc, char *argv[]) {
bsc_xfer_t xfer;
int status;
if (gpioInitialise() < 0) {
fprintf(stderr, "pigpio initialisation failed.\n");
return 1;
}
if ( ! eventSetFunc(PI_EVENT_BSC, simple_bsc_event_callback) ){
xfer.control = (SELFADDR << 16) | 0x305;
status = bscXfer(&xfer);
if (! status ) {
fprintf(stderr, "process register failed.\n");
}
}
sleep(20);
gpioTerminate();
}
pi@raspberrypi:~/venv/sandbox $ sudo ./prog
0f 45 65 01 00 00 83 02 00 01 00 ec d0 00 00 75 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 a2
4a 2f 00 51 4c 6f 67 69 63 20 46 61 73 74 4c 69 51 4c 34 31 31 33 34 48 4c 52 4a 20 31 30 47 f1
[b]^^^^ (some bytes missing as seen below) -[/b]
0f 45 65 01 00 00 13 62 45 20 41 64 61 70 74 65 72 20 2d 20 4c 41 4e 34 00 51 4c 6f 67 69 63 20
69 6e 51 20 51 4c 34 31 31 33 34 48 4c 52 4a 20 62 45 20 41 64 61 70 74 65 72 20 2d 20 4c 41 42
12 65 01 00 00 63 4e 2b 52 44 4d 41 00 00 00 ff
below observed on i2csniffer
radix: hexadecimal
0F 45 65 01 00 00 83 02 00 01 00 EC D0 00 00 75 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 A2
[b]02 02 01 00 00[/b] 4A 2F 00 51 4C 6F 67 69 63 20 46 61 73 74 4C 69 6E 51 20 51 4C 34 31 31 33 34 48 4C 52 4A 20 31 30 47 F1
^^^^^^^^^^^^^^^^ (missing of 1st transaction) ^^^^^^^^^
; but on with below code I do not get the same bytes as that seen on total-phase sniffer -