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edsion: add logic to handle tristate around directions

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Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-07-21 14:17:35 +01:00
committed by Brendan Le Foll
parent eba959e5f6
commit 011ce1d196
1 changed files with 20 additions and 0 deletions
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20
src/intel_edison_fab_c.c
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@@ -45,6 +45,8 @@ typedef struct {
mraa_intel_edision_pindef_t uart;
} mraa_intel_edison_pinmodes_t;
static mraa_gpio_context tristate;
static mraa_intel_edison_pinmodes_t pinmodes[MRAA_INTEL_EDISON_PINCOUNT];
static unsigned int outputen[] = {248,249,250,251,252,253,254,255,256,257,258,259,260,261,232,233,234,235,236,237};
@@ -77,6 +79,8 @@ mraa_intel_edison_pinmode_change(int sysfs, int mode)
mraa_result_t
mraa_intel_edison_gpio_dir_pre(mraa_gpio_context dev, gpio_dir_t dir)
{
if (mraa_gpio_write(tristate, 0) != MRAA_SUCCESS)
return MRAA_ERROR_INVALID_RESOURCE;
if (dev->phy_pin >= 0) {
int pin = dev->phy_pin;
@@ -93,6 +97,12 @@ mraa_intel_edison_gpio_dir_pre(mraa_gpio_context dev, gpio_dir_t dir)
return MRAA_SUCCESS;
}
mraa_result_t
mraa_intel_edison_gpio_dir_post(mraa_gpio_context dev, gpio_dir_t dir)
{
return mraa_gpio_write(tristate, 1);
}
mraa_result_t
mraa_intel_edison_gpio_init_post(mraa_gpio_context dev)
{
@@ -120,9 +130,19 @@ mraa_intel_edison_fab_c()
advance_func->gpio_dir_pre = &mraa_intel_edison_gpio_dir_pre;
advance_func->gpio_init_post = &mraa_intel_edison_gpio_init_post;
advance_func->gpio_dir_post = &mraa_intel_edison_gpio_dir_post;
b->pins = (mraa_pininfo_t*) malloc(sizeof(mraa_pininfo_t)*MRAA_INTEL_EDISON_PINCOUNT);
tristate = mraa_gpio_init_raw(214);
if (tristate == NULL) {
fprintf(stderr, "Intel Edison Failed to initialise Arduino board TriState,\
check i2c devices! FATAL\n");
return NULL;
}
mraa_gpio_dir(tristate, MRAA_GPIO_OUT);
strncpy(b->pins[4].name, "IO4", 8);
b->pins[4].capabilites = (mraa_pincapabilities_t) {1,1,0,0,0,0,0};
b->pins[4].gpio.pinmap = 129;