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ftdi_ft4222: Added GPIO interrupt support for language bindings.

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- FT4222 GPIO ISR implementation was specific to C/C++ and ignored
  language binding support. This is now fixed via adv_func updates.
- GPIO ISR code has been refactored to reduce i2c traffic when using
  I/O expanders
- Added support for built-in FT4222 GPIO interrupts

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
This commit is contained in:
Henry Bruce
2016-02-04 12:27:51 -08:00
committed by Brendan Le Foll
parent d2fcb88c4b
commit 1fd4ed5736
3 changed files with 141 additions and 86 deletions
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35
src/gpio/gpio.c
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@@ -268,18 +268,21 @@ static void*
mraa_gpio_interrupt_handler(void* arg)
{
mraa_gpio_context dev = (mraa_gpio_context) arg;
if (IS_FUNC_DEFINED(dev, gpio_interrupt_handler_replace))
return dev->advance_func->gpio_interrupt_handler_replace(dev);
int fp = -1;
mraa_result_t ret;
// open gpio value with open(3)
char bu[MAX_SIZE];
sprintf(bu, SYSFS_CLASS_GPIO "/gpio%d/value", dev->pin);
int fp = open(bu, O_RDONLY);
if (fp < 0) {
syslog(LOG_ERR, "gpio: failed to open gpio%d/value", dev->pin);
return NULL;
if (IS_FUNC_DEFINED(dev, gpio_interrupt_handler_init_replace)) {
if (dev->advance_func->gpio_interrupt_handler_init_replace(dev) != MRAA_SUCCESS)
return NULL;
} else {
// open gpio value with open(3)
char bu[MAX_SIZE];
sprintf(bu, SYSFS_CLASS_GPIO "/gpio%d/value", dev->pin);
fp = open(bu, O_RDONLY);
if (fp < 0) {
syslog(LOG_ERR, "gpio: failed to open gpio%d/value", dev->pin);
return NULL;
}
}
#ifndef HAVE_PTHREAD_CANCEL
@@ -309,11 +312,15 @@ mraa_gpio_interrupt_handler(void* arg)
#endif
for (;;) {
ret = mraa_gpio_wait_interrupt(dev->isr_value_fp
if (IS_FUNC_DEFINED(dev, gpio_wait_interrupt_replace)) {
ret = dev->advance_func->gpio_wait_interrupt_replace(dev);
} else {
ret = mraa_gpio_wait_interrupt(dev->isr_value_fp
#ifndef HAVE_PTHREAD_CANCEL
, dev->isr_control_pipe[0]
#endif
);
}
if (ret == MRAA_SUCCESS && !dev->isr_thread_terminating) {
#ifdef HAVE_PTHREAD_CANCEL
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
@@ -391,8 +398,10 @@ mraa_gpio_interrupt_handler(void* arg)
#ifdef HAVE_PTHREAD_CANCEL
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
#endif
close(dev->isr_value_fp);
dev->isr_value_fp = -1;
if (fp != -1) {
close(dev->isr_value_fp);
dev->isr_value_fp = -1;
}
#if defined(SWIGJAVA) || defined(JAVACALLBACK)
if(dev->isr == mraa_java_isr_callback) {