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Updated the GPIO command to add in new features for PWM

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Updated wiringPi to add new PWM controls.
This commit is contained in:
Gordon Henderson 2012-08-19 15:12:45 +01:00
parent c433519cf1
commit f99ffeda40
5 changed files with 170 additions and 45 deletions
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2
gpio/Makefile
View File

@ -41,7 +41,7 @@ OBJ = gpio.o
all: gpio
gpio: gpio.o
gpio: gpio.o /usr/local/lib/libwiringPi.a
@echo [LD]
@$(CC) -o $@ gpio.o $(LDFLAGS) $(LIBS)

70
gpio/gpio.1
View File

@ -4,20 +4,38 @@
gpio \- Command-line access to Raspberry Pi and PiFace GPIO
.SH SYNOPSIS
.TP
.B gpio
.RB [ \-v ]
.TP
.B \-v
.PP
.B gpio
.RB [ \-g ]
.RB < read/write/pwm/mode ...>
.TP
.B [ \-g ]
.B read/write/pwm/mode ...
.PP
.B gpio
.RB [ \-p ]
.RB < read/write/mode ...>
.TP
.B [ \-p ]
.B read/write/mode
.B ...
.PP
.B gpio
.RB < export/edge/unexport/unexportall/exports ...>
.B unexportall/exports
.PP
.B gpio
.B export/edge/unexport
.B ...
.PP
.B gpio
.B drive
group value
.PP
.B gpio
.B pwm-bal/pwm-ms
.PP
.B gpio
.B pwmr
range
.PP
.B gpio
.B load \ i2c/spi
.SH DESCRIPTION
@ -64,6 +82,14 @@ Set a pin into \fIinput\fR, \fIoutput\fR or \fIpwm\fR mode. Can also
use the literals \fIup\fR, \fIdown\fR or \fItri\fR to set the internal
pull-up, pull-down or tristate (off) controls.
.TP
.B unexportall
Un-Export all the GPIO pins in the /sys/class/gpio directory.
.TP
.B exports
Print a list (if any) of all the exported GPIO pins and their current values.
.TP
.B export
Export a GPIO pin in the \fI/sys/class/gpio\fR directory. Use like the
@ -96,12 +122,26 @@ requiring root/sudo.
Un-Export a GPIO pin in the /sys/class/gpio directory.
.TP
.B unexportall
Un-Export all the GPIO pins in the /sys/class/gpio directory.
.B drive
group value
Change the pad driver value for the given pad group to the supplied drive
value. Group is 0, 1 or 2 and value is 0-7. Do not use unless you are
absolutely sure you know what you're doing.
.TP
.B exports
Print a list (if any) of all the exported GPIO pins and their current values.
.B pwm-bal/pwm-ms
Change the PWM mode to balanced (the default) or mark:space ratio (traditional)
.TP
.B pwmr
Change the PWM range register. The default is 1024.
.TP
.B load i2c/spi
This loads the i2c or the spi drivers into the system and changes the permissions on
the associated /dev/ entries so that the current user has access to them.
.SH "WiringPi vs. GPIO Pin numbering"
@ -170,7 +210,7 @@ Gordon Henderson
.SH "REPORTING BUGS"
Report bugs to <gordon@drogon.net>
Report bugs to <projects@drogon.net>
.SH COPYRIGHT

77
gpio/gpio.c
View File

@ -46,6 +46,8 @@ char *usage = "Usage: gpio -v\n"
" gpio [-p] <read/write/mode> ...\n"
" gpio export/edge/unexport/unexportall/exports ...\n"
" gpio drive <group> <value>\n"
" gpio pwm-bal/pwm-ms \n"
" gpio pwmr <range> \n"
" gpio load spi/i2c" ;
@ -487,18 +489,12 @@ void doMode (int argc, char *argv [])
mode = argv [3] ;
/**/ if (strcasecmp (mode, "in") == 0)
pinMode (pin, INPUT) ;
else if (strcasecmp (mode, "out") == 0)
pinMode (pin, OUTPUT) ;
else if (strcasecmp (mode, "pwm") == 0)
pinMode (pin, PWM_OUTPUT) ;
else if (strcasecmp (mode, "up") == 0)
pullUpDnControl (pin, PUD_UP) ;
else if (strcasecmp (mode, "down") == 0)
pullUpDnControl (pin, PUD_DOWN) ;
else if (strcasecmp (mode, "tri") == 0)
pullUpDnControl (pin, PUD_OFF) ;
/**/ if (strcasecmp (mode, "in") == 0) pinMode (pin, INPUT) ;
else if (strcasecmp (mode, "out") == 0) pinMode (pin, OUTPUT) ;
else if (strcasecmp (mode, "pwm") == 0) pinMode (pin, PWM_OUTPUT) ;
else if (strcasecmp (mode, "up") == 0) pullUpDnControl (pin, PUD_UP) ;
else if (strcasecmp (mode, "down") == 0) pullUpDnControl (pin, PUD_DOWN) ;
else if (strcasecmp (mode, "tri") == 0) pullUpDnControl (pin, PUD_OFF) ;
else
{
fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/up/down/tri\n", argv [1], mode) ;
@ -629,6 +625,39 @@ void doPwm (int argc, char *argv [])
}
/*
* doPwmMode: doPwmRange:
* Change the PWM mode and Range values
*********************************************************************************
*/
static void doPwmMode (int mode)
{
pwmSetMode (mode) ;
}
static void doPwmRange (int argc, char *argv [])
{
unsigned int range ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s pwmr <range>\n", argv [0]) ;
exit (1) ;
}
range = (unsigned int)strtoul (argv [2], NULL, 10) ;
if (range == 0)
{
fprintf (stderr, "%s: range must be > 0\n", argv [0]) ;
exit (1) ;
}
pwmSetRange (range) ;
}
/*
* main:
* Start here
@ -734,18 +763,22 @@ int main (int argc, char *argv [])
wpMode = WPI_MODE_PINS ;
}
// Check for PWM operations
if (wpMode != WPI_MODE_PIFACE)
{
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 ; }
}
// Check for wiring commands
/**/ if (strcasecmp (argv [1], "write" ) == 0)
doWrite (argc, argv) ;
else if (strcasecmp (argv [1], "read" ) == 0)
doRead (argc, argv) ;
else if (strcasecmp (argv [1], "mode" ) == 0)
doMode (argc, argv) ;
else if (strcasecmp (argv [1], "pwm" ) == 0)
doPwm (argc, argv) ;
else if (strcasecmp (argv [1], "drive" ) == 0)
doPadDrive (argc, argv) ;
/**/ if (strcasecmp (argv [1], "write" ) == 0) doWrite (argc, argv) ;
else if (strcasecmp (argv [1], "read" ) == 0) doRead (argc, argv) ;
else if (strcasecmp (argv [1], "mode" ) == 0) doMode (argc, argv) ;
else if (strcasecmp (argv [1], "pwm" ) == 0) doPwm (argc, argv) ;
else if (strcasecmp (argv [1], "drive" ) == 0) doPadDrive (argc, argv) ;
else
{
fprintf (stderr, "%s: Unknown command: %s. (read/write/pwm/mode/drive expected)\n", argv [0], argv [1]) ;

58
wiringPi/wiringPi.c
View File

@ -79,6 +79,8 @@ void (*setPadDrive) (int group, int value) ;
int (*digitalRead) (int pin) ;
int (*waitForInterrupt) (int pin, int mS) ;
void (*delayMicroseconds) (unsigned int howLong) ;
void (*pwmSetMode) (int mode) ;
void (*pwmSetRange) (unsigned int range) ;
#ifndef TRUE
@ -377,22 +379,25 @@ void pinModeGpio (int pin, int mode)
if (!pwmRunning)
{
*(pwm + PWM_CONTROL) = 0 ; // Stop PWM
delayMicroseconds (10) ;
// Gert/Doms Values
*(clk + PWMCLK_DIV) = BCM_PASSWORD | (32<<12) ; // set pwm div to 32 (19.2/3 = 600KHz)
*(clk + PWMCLK_DIV) = BCM_PASSWORD | (32<<12) ; // set pwm div to 32 (19.2/32 = 600KHz)
*(clk + PWMCLK_CNTL) = BCM_PASSWORD | 0x11 ; // Source=osc and enable
digitalWrite (pin, LOW) ;
*(pwm + PWM_CONTROL) = 0 ; // Disable PWM
delayMicroseconds (10) ;
*(pwm + PWM0_RANGE) = 0x400 ;
delayMicroseconds (10) ;
*(pwm + PWM1_RANGE) = 0x400 ;
delayMicroseconds (10) ;
*(pwm + PWM0_RANGE) = 0x400 ; delayMicroseconds (10) ;
*(pwm + PWM1_RANGE) = 0x400 ; delayMicroseconds (10) ;
// Enable PWMs
*(pwm + PWM0_DATA) = 512 ;
*(pwm + PWM1_DATA) = 512 ;
// Balanced mode (default)
*(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE ;
pwmRunning = TRUE ;
@ -423,6 +428,38 @@ void pinModeSys (int pin, int mode)
}
/*
* pwmControl:
* Allow the user to control some of the PWM functions
*********************************************************************************
*/
void pwmSetModeWPi (int mode)
{
if (mode == PWM_MODE_MS)
*(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE | PWM0_MS_MODE | PWM1_MS_MODE ;
else
*(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE ;
}
void pwmSetModeSys (int mode)
{
return ;
}
void pwmSetRangeWPi (unsigned int range)
{
*(pwm + PWM0_RANGE) = range ; delayMicroseconds (10) ;
*(pwm + PWM1_RANGE) = range ; delayMicroseconds (10) ;
}
void pwmSetRangeSys (unsigned int range)
{
return ;
}
#ifdef notYetReady
/*
* pinED01:
@ -774,6 +811,8 @@ int wiringPiSetup (void)
digitalRead = digitalReadWPi ;
waitForInterrupt = waitForInterruptWPi ;
delayMicroseconds = delayMicrosecondsWPi ;
pwmSetMode = pwmSetModeWPi ;
pwmSetRange = pwmSetRangeWPi ;
// Open the master /dev/memory device
@ -928,6 +967,8 @@ int wiringPiSetupGpio (void)
digitalRead = digitalReadGpio ;
waitForInterrupt = waitForInterruptGpio ;
delayMicroseconds = delayMicrosecondsWPi ; // Same
pwmSetMode = pwmSetModeWPi ;
pwmSetRange = pwmSetRangeWPi ;
return 0 ;
}
@ -956,6 +997,9 @@ int wiringPiSetupSys (void)
digitalRead = digitalReadSys ;
waitForInterrupt = waitForInterruptSys ;
delayMicroseconds = delayMicrosecondsSys ;
pwmSetMode = pwmSetModeSys ;
pwmSetRange = pwmSetRangeSys ;
// Open and scan the directory, looking for exported GPIOs, and pre-open
// the 'value' interface to speed things up for later

8
wiringPi/wiringPi.h
View File

@ -41,6 +41,12 @@
#define PUD_DOWN 1
#define PUD_UP 2
// PWM
#define PWM_MODE_MS 0
#define PWM_MODE_BAL 1
// Function prototypes
// c++ wrappers thanks to a commend by Nick Lott
// (and others on the Raspberry Pi forums)
@ -65,6 +71,8 @@ extern void (*pwmWrite) (int pin, int value) ;
extern void (*setPadDrive) (int group, int value) ;
extern int (*digitalRead) (int pin) ;
extern void (*delayMicroseconds) (unsigned int howLong) ;
extern void (*pwmSetMode) (int mode) ;
extern void (*pwmSetRange) (unsigned int range) ;
// Interrupts