System: Refactor pin and interrupt setup

This should ensure better readability of the pin setup procedure,
as well as allow the configuration of the hardware button enable pin
and the accelerometer interrupt pin via the pin mapping header.

Author: StarGate01

src/drivers/PinMap.h

@@ -16,8 +16,10 @@ namespace Pinetime {
       static constexpr uint8_t Button = 13;      
     #endif
 
+    static constexpr uint8_t ButtonEnable = 15;
     static constexpr uint8_t Cst816sIrq = 28;
     static constexpr uint8_t PowerPresent = 19;
+    static constexpr uint8_t Bma421Irq = 8;
 
     static constexpr uint8_t Motor = 16;
 

src/systemtask/SystemTask.cpp

@@ -172,39 +172,29 @@ void SystemTask::Work() {
 
   buttonHandler.Init(this);
 
-  // Button
-  nrf_gpio_cfg_output(15);
-  nrf_gpio_pin_set(15);
-
+  // Setup Interrupts
   nrfx_gpiote_in_config_t pinConfig;
   pinConfig.skip_gpio_setup = false;
   pinConfig.hi_accuracy = false;
   pinConfig.is_watcher = false;
-  pinConfig.sense = static_cast<nrf_gpiote_polarity_t>(NRF_GPIOTE_POLARITY_TOGGLE);
-  pinConfig.pull = static_cast<nrf_gpio_pin_pull_t>(GPIO_PIN_CNF_PULL_Pulldown);
 
+  // Button
+  nrf_gpio_cfg_output(PinMap::ButtonEnable);
+  nrf_gpio_pin_set(PinMap::ButtonEnable);
+  pinConfig.sense = NRF_GPIOTE_POLARITY_TOGGLE;
+  pinConfig.pull = NRF_GPIO_PIN_PULLDOWN;
   nrfx_gpiote_in_init(PinMap::Button, &pinConfig, nrfx_gpiote_evt_handler);
   nrfx_gpiote_in_event_enable(PinMap::Button, true);
 
   // Touchscreen
-  nrf_gpio_cfg_sense_input(PinMap::Cst816sIrq,
-                           static_cast<nrf_gpio_pin_pull_t>(GPIO_PIN_CNF_PULL_Pullup),
-                           static_cast<nrf_gpio_pin_sense_t>(GPIO_PIN_CNF_SENSE_Low));
-
-  pinConfig.skip_gpio_setup = true;
-  pinConfig.hi_accuracy = false;
-  pinConfig.is_watcher = false;
-  pinConfig.sense = static_cast<nrf_gpiote_polarity_t>(NRF_GPIOTE_POLARITY_HITOLO);
-  pinConfig.pull = static_cast<nrf_gpio_pin_pull_t>(GPIO_PIN_CNF_PULL_Pullup);
-
+  pinConfig.sense = NRF_GPIOTE_POLARITY_HITOLO;
+  pinConfig.pull = NRF_GPIO_PIN_PULLUP;
   nrfx_gpiote_in_init(PinMap::Cst816sIrq, &pinConfig, nrfx_gpiote_evt_handler);
+  nrfx_gpiote_in_event_enable(PinMap::Cst816sIrq, true);
 
   // Power present
   pinConfig.sense = NRF_GPIOTE_POLARITY_TOGGLE;
   pinConfig.pull = NRF_GPIO_PIN_NOPULL;
-  pinConfig.is_watcher = false;
-  pinConfig.hi_accuracy = false;
-  pinConfig.skip_gpio_setup = false;
   nrfx_gpiote_in_init(PinMap::PowerPresent, &pinConfig, nrfx_gpiote_evt_handler);
   nrfx_gpiote_in_event_enable(PinMap::PowerPresent, true);