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Improved the PWM functions with help from Chris Hall.

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This commit is contained in:
Gordon Henderson
2012-09-16 10:15:32 +01:00
parent 30d79dab76
commit 8cb493937f
3 changed files with 98 additions and 29 deletions
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29
gpio/gpio.c
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@@ -52,9 +52,10 @@ char *usage = "Usage: gpio -v\n"
" gpio drive <group> <value>\n"
" gpio pwm-bal/pwm-ms \n"
" gpio pwmr <range> \n"
" gpio pwmc <divider> \n"
" gpio load spi/i2c\n"
" gpio gbr <channel>\n"
" gpio gbw <channel> <value>\n" ;
" gpio gbw <channel> <value>" ; // No trailing newline needed here.
/*
@@ -687,8 +688,8 @@ void doPwm (int argc, char *argv [])
/*
* doPwmMode: doPwmRange:
* Change the PWM mode and Range values
* doPwmMode: doPwmRange: doPwmClock:
* Change the PWM mode, range and clock divider values
*********************************************************************************
*/
@@ -718,6 +719,27 @@ static void doPwmRange (int argc, char *argv [])
pwmSetRange (range) ;
}
static void doPwmClock (int argc, char *argv [])
{
unsigned int clock ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s pwmc <clock>\n", argv [0]) ;
exit (1) ;
}
clock = (unsigned int)strtoul (argv [2], NULL, 10) ;
if ((clock < 1) || (clock > 4095))
{
fprintf (stderr, "%s: clock must be between 0 and 4096\n", argv [0]) ;
exit (1) ;
}
pwmSetClock (clock) ;
}
/*
* main:
@@ -846,6 +868,7 @@ int main (int argc, char *argv [])
if (strcasecmp (argv [1], "pwm-bal") == 0) { doPwmMode (PWM_MODE_BAL) ; return 0 ; }
if (strcasecmp (argv [1], "pwm-ms") == 0) { doPwmMode (PWM_MODE_MS) ; return 0 ; }
if (strcasecmp (argv [1], "pwmr") == 0) { doPwmRange (argc, argv) ; return 0 ; }
if (strcasecmp (argv [1], "pwmc") == 0) { doPwmClock (argc, argv) ; return 0 ; }
}
// Check for wiring commands