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apps/examples/adc: Add support for software triggering

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This commit is contained in:
Gregory Nutt 2013-10-25 14:17:29 -06:00
parent 097a0952f0
commit eb39b81b69
3 changed files with 27 additions and 2 deletions
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2
ChangeLog.txt
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@ -697,4 +697,6 @@
some kruft removal (2013-10-24).
* apps/examples/can/can_main.c: Correct an error in a debug
statement. From Martin Lederhilger (2013-10-24).
* apps/examples/adc: Add support so that a ADC driven by
software triggering can be tested (2013-10-25).

11
examples/adc/Kconfig
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@ -34,4 +34,15 @@ config EXAMPLES_ADC_GROUPSIZE
---help---
The number of samples to read at once. Default: 4
config EXAMPLES_ADC_SWTRIG
bool "Use software trigger"
default n
---help---
Some ADCs may be configured so there is no automatic or periodic
conversion of samples. Rather, the ADC sampling must be trigger by
software via an ioctl command. Select this option only if
applicable for your ADC configuration. In this case, the test will
issue the software trigger ioctl before attempting to read from the
ADC.
endif

16
examples/adc/adc_main.c
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@ -40,6 +40,7 @@
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
@ -310,7 +311,18 @@ int adc_main(int argc, char *argv[])
msgflush();
/* Read CONFIG_EXAMPLES_ADC_GROUPSIZE samples */
#ifdef CONFIG_EXAMPLES_ADC_SWTRIG
/* Issue the software trigger to start ADC conversion */
ret = ioctl(fd, ANIOC_TRIGGER, 0);
if (ret < 0)
{
int errcode = errno;
message("adc_main: ANIOC_TRIGGER ioctl failed: %d\n", errcode);
}
#endif
/* Read up to CONFIG_EXAMPLES_ADC_GROUPSIZE samples */
readsize = CONFIG_EXAMPLES_ADC_GROUPSIZE * sizeof(struct adc_msg_s);
nbytes = read(fd, sample, readsize);
@ -351,7 +363,7 @@ int adc_main(int argc, char *argv[])
for (i = 0; i < nsamples ; i++)
{
message("%d: channel: %d value: %d\n",
i, sample[i].am_channel, sample[i].am_data);
i+1, sample[i].am_channel, sample[i].am_data);
}
}
}