In the following line of code you can read that the value 0x98 is the
*second* argument passed to the function:
pruIo *io = pruio_new(PRUIO_DEF_ACTIVE, 0x98, 0, 1);
I forgot to point to the function in the text.
Am Samstag, 13. Februar 2016 13:01:04 UTC+1 schrieb Davide Picchi:
>
> I was reading carefully the following example taken from here:
>
> file: button.c
>
> define _GNU_SOURCE 1
> #include "stdio.h"
> #include <termios.h>
> #include <unistd.h>
> #include <errno.h>
> #include <sys/types.h>
> #include <sys/time.h>
> #include "../c_wrapper/pruio.h"
> #include "../c_wrapper/pruio_pins.h"
>
> #define PIN P8_07
>
> int
> isleep(unsigned int mseconds)
> {
> fd_set set;
> struct timeval timeout;
>
> /* Initialize the file descriptor set. */
> FD_ZERO(&set);
> FD_SET(STDIN_FILENO, &set);
>
> /* Initialize the timeout data structure. */
> timeout.tv_sec = 0;
> timeout.tv_usec = mseconds * 1000;
>
> return TEMP_FAILURE_RETRY(select(FD_SETSIZE,
> &set, NULL, NULL,
> &timeout));
> }
>
> int main(int argc, char **argv)
> {
> pruIo *io = pruio_new(PRUIO_DEF_ACTIVE, 0x98, 0, 1); // <= LOOK HERE
>
> do {
> if (io->Errr) {
> printf("initialisation failed (%s)\n", io->Errr); break;}
>
> if (pruio_config(io, 1, 0x1FE, 0, 4)) {
> printf("config failed (%s)\n", io->Errr); break;}
>
> struct termios oldt, newt; // make terminal non-blocking
> tcgetattr( STDIN_FILENO, &oldt );
> newt = oldt;
> newt.c_lflag &= ~( ICANON | ECHO );
> newt.c_cc[VMIN] = 0;
> newt.c_cc[VTIME] = 0;
> tcsetattr(STDIN_FILENO, TCSANOW, &newt);
>
> while(!isleep(1)) { // run loop until keystroke
> printf("\r%1X", pruio_gpio_Value(io, PIN));
> fflush(STDIN_FILENO);
> }
> tcsetattr(STDIN_FILENO, TCSANOW, &oldt); // reset terminal
>
> printf("\n");
> } while (0);
>
> pruio_destroy(io); /* destroy driver structure */
> return 0;
> }
>
>
> In the following line of code you can read that the value 0x98 is the
> *second* argument passed to the function.
> *BUT* In the documentation I found that:
>
> pruIo* pruio_new ( uint16 *Act*,
>
>
> uint8 *Av*,
>
>
> uint32 *OpD*,
>
>
> uint8 *SaD*
>
> )
>
> Wrapper function for the constructor PruIo::PruIo().
> Parameters
> Act mask for active subsystems and PRU number
> Av avaraging for default steps (0 to 16, defaults to 0)
> OpD open delay for default steps (0 to 0x3FFFF, defaults to 0x98)
> SaD sample delay for default steps (0 to 255, defaults to 0)
> the second argument of that function should be the parameter Av, which
> ranges [0-16].
> the OpD is passed lately to the function.
>
> Is there a problem in the documentation or somewhere else??
>
>
>
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
