On 24.09.2016 at 16:29, Torsten Rosenberger wrote:
> i try to write a php extension for raspberry to get i2c data.
> This is my first extension. And maybe not the corect mailing list.
>
> The Problem, on the CLI I get the correct return value.
> If i run the same code in an webbrowser i got a wrong value.
>
> PHP_FUNCTION(i2c_read_value)
> {
> int arg_len;
> unsigned char reg;
> unsigned short res;
>
> if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", ®,
> &arg_len) == FAILURE){
That looks wrong. `reg` should be declared as `char *`.
> RETURN_FALSE;
> }
>
> res = i2c_smbus_read_byte_data(dev_fd, reg);
Where is dev_fd defined and initialized?
> RETURN_LONG(res);
> }
>
>
> if i run these code in CLI
> <?php
>
> i2c_init(1,0x48,0);
> echo i2c_read_value(0x40);
> i2c_close();
>
> ?>
>
> php i2c.php
>
> i get 49 these comes from an ADC and the range is 0 - 255. In an C
> programm i get the same value.
>
> wenn I run the script in an browser i get: 65535
>
> someone can give me a hint ?
There might be a permission or working directory issue.
--
Christoph M. Becker
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