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firmata: very crude ISR implementation for EDGE_BOTH

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Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Mihai Tudor Panu
2016-03-23 08:32:02 +00:00
committed by Brendan Le Foll
parent 319c932036
commit 49ab97f81c
1 changed files with 42 additions and 0 deletions
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42
src/firmata/firmata_mraa.c
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@@ -33,6 +33,7 @@
static t_firmata* firmata_dev;
static pthread_t thread_id;
static volatile int isr_detected;
mraa_firmata_context
mraa_firmata_init(int feature)
@@ -415,6 +416,34 @@ mraa_firmata_gpio_dir_replace(mraa_gpio_context dev, mraa_gpio_dir_t dir)
return MRAA_SUCCESS;
}
static mraa_result_t
mraa_firmata_gpio_edge_mode_replace(mraa_gpio_context dev, mraa_gpio_edge_t mode)
{
switch (mode) {
case MRAA_GPIO_EDGE_BOTH:
return MRAA_SUCCESS;
default:
return MRAA_ERROR_FEATURE_NOT_IMPLEMENTED;
}
}
static mraa_result_t
mraa_firmata_gpio_interrupt_handler_init_replace(mraa_gpio_context dev)
{
return MRAA_SUCCESS;
}
static mraa_result_t
mraa_firmata_gpio_wait_interrupt_replace(mraa_gpio_context dev)
{
while (!((isr_detected >> dev->pin) & 1)) {
usleep(100);
}
// might want to lock here?
isr_detected &= ~(1 << dev->pin);
return MRAA_SUCCESS;
}
static mraa_result_t
mraa_firmata_gpio_close_replace(mraa_gpio_context dev)
{
@@ -471,8 +500,18 @@ mraa_firmata_pwm_enable_replace(mraa_pwm_context dev, int enable)
static void*
mraa_firmata_pull_handler(void* vp)
{
int i, isr_now, isr_prev;
isr_prev = 0;
while(1) {
isr_now = 0;
firmata_pull(firmata_dev);
// would prefer to send board pointer as argument
for(i = 0; i < 14; i++) {
isr_now |= (firmata_dev->pins[i].value & 1) << i;
}
// might want to lock here?
isr_detected = isr_prev ^ isr_now; //both edges for now
isr_prev = isr_now;
usleep(100);
}
}
@@ -605,6 +644,9 @@ mraa_firmata_plat_init(const char* uart_dev)
b->adv_func->gpio_init_internal_replace = &mraa_firmata_gpio_init_internal_replace;
b->adv_func->gpio_mode_replace = &mraa_firmata_gpio_mode_replace;
b->adv_func->gpio_dir_replace = &mraa_firmata_gpio_dir_replace;
b->adv_func->gpio_edge_mode_replace = &mraa_firmata_gpio_edge_mode_replace;
b->adv_func->gpio_interrupt_handler_init_replace = &mraa_firmata_gpio_interrupt_handler_init_replace;
b->adv_func->gpio_wait_interrupt_replace = &mraa_firmata_gpio_wait_interrupt_replace;
b->adv_func->gpio_read_replace = &mraa_firmata_gpio_read_replace;
b->adv_func->gpio_write_replace = &mraa_firmata_gpio_write_replace;
b->adv_func->gpio_close_replace = &mraa_firmata_gpio_close_replace;