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This version (05 Feb 2021 15:48) was approved by Michael Hennerich.The Previously approved version (02 Jan 2013 22:19) is available.Diff

Table of Contents

iio-trig-bfin-timer driver

Description

This driver allows any Blackfin system timer to be used as IIO trigger. It supports trigger rates from 0 to 100kHz in Hz resolution.

This driver depends on BLACKFIN

Adding Linux driver support

Configure kernel with “make menuconfig” (alternatively use “make xconfig” or “make qconfig”) 

Linux Kernel Configuration
	Device Drivers  --->
		[*] Staging drivers  --->
			<*>     Industrial I/O support  --->
			    --- Industrial I/O support
			    -*-   Enable ring buffer support within IIO
			    -*-     Industrial I/O lock free software ring
			    -*-   Enable triggered sampling support
			    
			    [--snip--]
			    
			          *** Triggers - standalone ***
			    < >   Periodic RTC triggers
			    < >   GPIO trigger
			    < >   SYSFS trigger
			    <*>   Blackfin TIMER trigger

Example platform device initialization

One or multiple instances of this driver can be declared by adding appropriate platform device data. An example is shown below: 

static struct resource iio_bfin_trigger_resources[] = {
	{
		.start = IRQ_TIMER3,
		.end = IRQ_TIMER3,
		.flags = IORESOURCE_IRQ,
	},
};
 
static struct platform_device iio_bfin_trigger = {
	.name		= "iio_bfin_tmr_trigger",
	.id		= 0,
	.num_resources	= ARRAY_SIZE(iio_bfin_trigger_resources),
	.resource	= iio_bfin_trigger_resources,
};
static struct platform_device *board_devices[] __initdata = {
	&iio_bfin_trigger
};
static int __init board_init(void)
{
	[--snip--]
 
	platform_add_devices(board_devices, ARRAY_SIZE(board_devices));
 
	[--snip--]
 
	return 0;
}
arch_initcall(board_init);

Driver testing

This specifies any shell prompt running on the target 

root:/> cd sys/bus/iio/devices/
root:/sys/bus/iio/devices> ls
device0                  device0:buffer0:event0   device1:buffer0:access0
device0:buffer0          device1                  device1:buffer0:event0
device0:buffer0:access0  device1:buffer0          trigger0

This specifies any shell prompt running on the target 

root:/sys/bus/iio/devices> cd trigger0
root:/sys/devices/trigger0> ls
name         subsystem    frequency  uevent

This specifies any shell prompt running on the target 

root:/sys/devices/trigger0> cat name
bfintmr3

This specifies any shell prompt running on the target 

root:/sys/devices/trigger0> echo 1000 > frequency
root:/sys/devices/trigger0> echo 0 > frequency

software/linux/docs/iio/iio-trig-bfin-timer.txt · Last modified: 05 Feb 2021 15:48 by Michael Hennerich

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