Passing Values between C App and PHP
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From: Tobias Krieger on 21 Jun 2009 17:25 Hi, I've recently written an eMail regarding I2C and PHP - since I haven't found a nice solution yet, I'm considering writting the I2C part (opening device, writing, reading,...) in C (that's simple) and to recieve (and returning) the values through PHP and Javascript. E.g. Website (PHP/Javascript) -> set a new motorspeed -> PHP passes the new speed to C Application -> C AP opens and writes the new speed onto the I2C Bus -> Motor executes -> returns ack ->---- Is this somehow, and not complicated possible? Thanks, Tobias
From: Nathan Nobbe on 21 Jun 2009 17:31 On Sun, Jun 21, 2009 at 3:25 PM, Tobias Krieger < tobias.krieger(a)teamfrednet.org> wrote: > Hi, > > I've recently written an eMail regarding I2C and PHP - since I haven't > found a nice solution yet, I'm considering writting the I2C part (opening > device, writing, reading,...) in C (that's simple) and to recieve (and > returning) the values through PHP and Javascript. > > E.g. Website (PHP/Javascript) -> set a new motorspeed -> PHP passes the new > speed to C Application -> C AP opens and writes the new speed onto the I2C > Bus -> Motor executes -> returns ack ->---- > > Is this somehow, and not complicated possible? if the C program is written such that it can start and stop on every request rather than as a daemon, its as simple as shell_exec(). write your C app to take args over the cli and then pass them in through the call: <?php $result = shell_exec('myI2C -speed 50'); ?> something of that nature. -nathan
From: Tobias Krieger on 21 Jun 2009 17:44 Am 21.06.2009 um 23:31 schrieb Nathan Nobbe: > On Sun, Jun 21, 2009 at 3:25 PM, Tobias Krieger <tobias.krieger(a)teamfrednet.org > > wrote: > Hi, > > I've recently written an eMail regarding I2C and PHP - since I > haven't found a nice solution yet, I'm considering writting the I2C > part (opening device, writing, reading,...) in C (that's simple) and > to recieve (and returning) the values through PHP and Javascript. > > E.g. Website (PHP/Javascript) -> set a new motorspeed -> PHP passes > the new speed to C Application -> C AP opens and writes the new > speed onto the I2C Bus -> Motor executes -> returns ack ->---- > > Is this somehow, and not complicated possible? > > if the C program is written such that it can start and stop on every > request rather than as a daemon, its as simple as shell_exec(). > > write your C app to take args over the cli and then pass them in > through the call: > > <?php > $result = shell_exec('myI2C -speed 50'); > ?> > > something of that nature. > > -nathan > This would be a nice and fast solution, but unfortunatelly, it's like that the C programm needs to surveilance the hardware all the time (controlling values,...) hence, it would run more as a "daemon". thx, tobias
From: Nathan Nobbe on 21 Jun 2009 19:51 On Sun, Jun 21, 2009 at 3:44 PM, Tobias Krieger < tobias.krieger(a)teamfrednet.org> wrote: > This would be a nice and fast solution, but unfortunatelly, it's like that > the C programm needs to surveilance the hardware all the time (controlling > values,...) hence, it would run more as a "daemon". > then you will have to make the C app accept socket connections; or maybe try unix signals handlers in the C app w/ shared memory betwen both processes; maybe there are easier ways to do it.. -nathan
From: "bruce" on 22 Jun 2009 03:26 if memory serves... you can look into using a shared memory block, or pipes to communicate between the php/c app.... -----Original Message----- From: Tobias Krieger [mailto:tobias.krieger(a)teamfrednet.org] Sent: Sunday, June 21, 2009 2:44 PM To: Nathan Nobbe Cc: php-general(a)lists.php.net Subject: Re: [PHP] Passing Values between C App and PHP Am 21.06.2009 um 23:31 schrieb Nathan Nobbe: > On Sun, Jun 21, 2009 at 3:25 PM, Tobias Krieger <tobias.krieger(a)teamfrednet.org > > wrote: > Hi, > > I've recently written an eMail regarding I2C and PHP - since I > haven't found a nice solution yet, I'm considering writting the I2C > part (opening device, writing, reading,...) in C (that's simple) and > to recieve (and returning) the values through PHP and Javascript. > > E.g. Website (PHP/Javascript) -> set a new motorspeed -> PHP passes > the new speed to C Application -> C AP opens and writes the new > speed onto the I2C Bus -> Motor executes -> returns ack ->---- > > Is this somehow, and not complicated possible? > > if the C program is written such that it can start and stop on every > request rather than as a daemon, its as simple as shell_exec(). > > write your C app to take args over the cli and then pass them in > through the call: > > <?php > $result = shell_exec('myI2C -speed 50'); > ?> > > something of that nature. > > -nathan > This would be a nice and fast solution, but unfortunatelly, it's like that the C programm needs to surveilance the hardware all the time (controlling values,...) hence, it would run more as a "daemon". thx, tobias
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