linguini1 commented on issue #994:
URL: https://github.com/apache/nuttx-apps/issues/994#issuecomment-2231986178
I managed to get proper detection for all the sensors I have access to using
the following logic:
```c
int main(int argc, FAR char *argv[]) {
int err;
int i2c = open("/dev/i2c0", O_RDWR);
if (i2c < 0) {
fprintf(stderr, "Couldn't open /dev/i2c0: %d\n", errno);
return 1;
}
uint8_t contents = 0;
for (unsigned int i = 0; i < 128; i++) {
struct i2c_transfer_s i2c_transfer;
struct i2c_msg_s msg = {
.frequency = I2C_SPEED_FAST,
.addr = i,
.flags = 0,
.buffer = &contents,
.length = 0,
};
i2c_transfer.msgv = &msg;
i2c_transfer.msgc = 1;
err = ioctl(i2c, I2CIOC_TRANSFER, (unsigned long)(&i2c_transfer));
if (!err) {
printf("%02x\n", i);
}
}
return 0;
}
```
Because the message length is set to 0, I would expect that the I2C driver
is just sending the address header, but I will have to wait until I have access
to a logic analyzer to confirm.
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