flipper-zero-tutorials/gpio/wiegand/scenes/wiegand_read.c
2023-09-06 12:02:26 -05:00

101 lines
2.9 KiB
C

#include "../wiegand.h"
void wiegand_isr_d0(void* context) {
UNUSED(context);
uint32_t time = DWT->CYCCNT;
bool rise = furi_hal_gpio_read(pinD0);
data[bit_count] = 0;
if(rise) {
data_rise[bit_count] = time;
if(bit_count < MAX_BITS) {
bit_count++;
}
} else {
data_fall[bit_count] = time;
}
}
void wiegand_isr_d1(void* context) {
UNUSED(context);
uint32_t time = DWT->CYCCNT;
bool rise = furi_hal_gpio_read(pinD1);
data[bit_count] = 1;
if(rise) {
data_rise[bit_count] = time;
if(bit_count < MAX_BITS) {
bit_count++;
}
} else {
data_fall[bit_count] = time;
}
}
void wiegand_start_read(void* context) {
App* app = context;
data_saved = false;
bit_count = 0;
furi_hal_gpio_init_simple(pinD0, GpioModeInterruptRiseFall);
furi_hal_gpio_init_simple(pinD1, GpioModeInterruptRiseFall);
furi_hal_gpio_add_int_callback(pinD0, wiegand_isr_d0, NULL);
furi_hal_gpio_add_int_callback(pinD1, wiegand_isr_d1, NULL);
furi_timer_start(app->timer, 100);
}
void wiegand_stop_read(void* context) {
App* app = context;
furi_hal_gpio_remove_int_callback(pinD0);
furi_hal_gpio_remove_int_callback(pinD1);
furi_hal_gpio_init_simple(pinD0, GpioModeAnalog);
furi_hal_gpio_init_simple(pinD1, GpioModeAnalog);
furi_timer_stop(app->timer);
}
void wiegand_timer_callback(void* context) {
App* app = context;
uint32_t duration = DWT->CYCCNT;
const uint32_t one_millisecond = 64000;
if(bit_count == 0) {
return;
}
duration -= data_fall[bit_count - 1];
FURI_CRITICAL_ENTER();
if(duration > 25 * one_millisecond) {
if(bit_count == 4 || bit_count == 8 || bit_count == 24 || bit_count == 26 ||
bit_count == 32 || bit_count == 34 || bit_count == 37 || bit_count == 40 ||
bit_count == 48) {
wiegand_stop_read(app);
scene_manager_next_scene(app->scene_manager, WiegandDataScene);
} else {
// No data, clear
bit_count = 0;
}
}
FURI_CRITICAL_EXIT();
}
void wiegand_read_scene_on_enter(void* context) {
App* app = context;
widget_reset(app->widget);
widget_add_string_element(app->widget, 0, 0, AlignLeft, AlignTop, FontPrimary, "Read Wiegand");
widget_add_string_element(
app->widget, 0, 25, AlignLeft, AlignTop, FontSecondary, "Waiting for signal...");
widget_add_string_element(
app->widget, 0, 45, AlignLeft, AlignTop, FontSecondary, "D0/Green/A4");
widget_add_string_element(
app->widget, 0, 53, AlignLeft, AlignTop, FontSecondary, "D1/White/A7");
wiegand_start_read(app);
view_dispatcher_switch_to_view(app->view_dispatcher, WiegandWidgetView);
}
void wiegand_read_scene_on_exit(void* context) {
App* app = context;
wiegand_stop_read(app);
}