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Galileo Gen2: add replace hook for pwm period

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* Warning, doing a period call on the gen2 will change it for all pwm
* channels and temporarily disable them whilst doing it.

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-07-24 14:25:41 +01:00
parent 595eec2737
commit 9d7e9aa4ca
1 changed files with 25 additions and 0 deletions
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25
src/intel_galileo_rev_g.c
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@@ -29,6 +29,8 @@
#include "common.h"
#include "intel_galileo_rev_g.h"
#define MAX_SIZE 64
mraa_result_t
mraa_intel_galileo_gen2_dir_pre(mraa_gpio_context dev, gpio_dir_t dir)
{
@@ -71,6 +73,28 @@ mraa_intel_galileo_gen2_i2c_init_pre(unsigned int bus)
return MRAA_SUCCESS;
}
mraa_result_t
mraa_intel_galileo_gen2_pwm_period_replace(mraa_pwm_context dev, int period)
{
char bu[MAX_SIZE];
snprintf(bu,MAX_SIZE ,"/sys/class/pwm/pwmchip%d/device/pwm_period", dev->chipid);
int period_f = open(bu, O_RDWR);
if (period_f == -1) {
fprintf(stderr, "Failed to open period for writing!\n");
return MRAA_ERROR_INVALID_RESOURCE;
}
char out[MAX_SIZE];
int length = snprintf(out, MAX_SIZE, "%d", period);
if (write(period_f, out, length*sizeof(char)) == -1) {
close(period_f);
return MRAA_ERROR_INVALID_RESOURCE;
}
close(period_f);
return MRAA_SUCCESS;
}
mraa_board_t*
mraa_intel_galileo_gen2()
{
@@ -86,6 +110,7 @@ mraa_intel_galileo_gen2()
advance_func->gpio_dir_pre = &mraa_intel_galileo_gen2_dir_pre;
advance_func->i2c_init_pre = &mraa_intel_galileo_gen2_i2c_init_pre;
advance_func->pwm_period_replace = &mraa_intel_galileo_gen2_pwm_period_replace;
b->pins = (mraa_pininfo_t*) malloc(sizeof(mraa_pininfo_t)*MRAA_INTEL_GALILEO_GEN_2_PINCOUNT);