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intel_edison_fab_c.c: Enhanced detection of Arduino expansion board

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Closes #318.

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Alex Tereschenko
2016-02-07 00:15:30 +01:00
committed by Brendan Le Foll
parent 1865dd0ba1
commit b33bd5ccd2
1 changed files with 70 additions and 5 deletions
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75
src/x86/intel_edison_fab_c.c
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@@ -29,6 +29,7 @@
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
#include <errno.h>
#include "common.h"
#include "x86/intel_edison_fab_c.h"
@@ -1154,6 +1155,71 @@ mraa_intel_edison_miniboard(mraa_board_t* b)
return MRAA_SUCCESS;
}
mraa_boolean_t
is_arduino_board()
{
// We check for two things to determine if that's an Arduino expansion board
// 1) is tristate GPIO available, by trying to initialize it
// 2) are there four specific GPIO expanders, by reading device labels
// /sys/class/gpio/gpiochip{200,216,232,248}/label == "pcal9555a"
char gpiochip_path[MAX_SIZE];
char gpiochip_label[MAX_SIZE];
const char gpiochip_label_arduino[] = "pcal9555a";
const int gpiochip_idx[4] = { 200, 216, 232, 248 };
// prepare format string for fscanf, based on MAX_SIZE
char format_str[MAX_SIZE];
snprintf(format_str, MAX_SIZE, "%%%ds", MAX_SIZE - 1);
int i;
// check tristate first
tristate = mraa_gpio_init_raw(214);
if (tristate == NULL) {
syslog(LOG_INFO, "edison: tristate not detected");
return 0;
}
// GPIO expanders second
for (i=0; i<(sizeof(gpiochip_idx)/sizeof(gpiochip_idx[0])); i++) {
memset(gpiochip_path, 0, MAX_SIZE);
snprintf(gpiochip_path,
MAX_SIZE,
SYSFS_CLASS_GPIO "/gpiochip%d/label",
gpiochip_idx[i]);
FILE *fp;
fp = fopen(gpiochip_path, "r");
if (fp == NULL) {
syslog(LOG_INFO,
"edison: could not open '%s', errno %d",
gpiochip_path,
errno);
return 0;
}
memset(gpiochip_label, 0, MAX_SIZE);
if (fscanf(fp, format_str, &gpiochip_label) != 1) {
syslog(LOG_INFO,
"edison: could not read from '%s', errno %d",
gpiochip_path,
errno);
return 0;
}
fclose(fp);
// we want to check for exact match
if (strncmp(gpiochip_label, gpiochip_label_arduino, strlen(gpiochip_label) + 1) != 0) {
syslog(LOG_INFO,
"edison: gpiochip label (%s) is not what we expect (%s)\n",
gpiochip_label,
gpiochip_label_arduino);
return 0;
}
}
syslog(LOG_NOTICE, "edison: Arduino board detected");
return 1;
}
mraa_board_t*
mraa_intel_edison_fab_c()
{
@@ -1164,11 +1230,10 @@ mraa_intel_edison_fab_c()
}
b->platform_name = PLATFORM_NAME;
// This seciton will also check if the arduino board is there
tristate = mraa_gpio_init_raw(214);
if (tristate == NULL) {
syslog(LOG_INFO, "edison: Failed to initialise Arduino board TriState,\
assuming Intel Edison Miniboard\n");
if (is_arduino_board() == 0) {
syslog(LOG_NOTICE,
"edison: Arduino board not detected, assuming Intel Edison Miniboard");
if (mraa_intel_edison_miniboard(b) != MRAA_SUCCESS) {
goto error;
}