basic button handler routines added, hard buttons tested

touch sensors were also preliminary tested but not all have been analyzed yet.

firmware/app/main.c

@@ -26,6 +26,8 @@
 #include "led/matrix.h"
 #include "led/ledprog.h"
 
+#include "ui/btn.h"
+
 /*
  *@Note
  ***Only PA0--PA15 and PC16--PC17 support input pull-down.
@@ -39,13 +41,13 @@ volatile uint8_t lp_render = 0;
 
 
 
-void clk_init()
+inline void clk_init()
 {
     SystemCoreClockUpdate();
 }
     
 
-void periphclk_init()
+static inline void periphclk_init()
 {
     // needed for GPIO, remap, ADC, SPI
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
@@ -59,7 +61,7 @@ void periphclk_init()
     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 | RCC_AHBPeriph_USBPD, ENABLE);
 }
 
-void gpio_init()
+static inline void gpio_init()
 {
     GPIO_InitTypeDef gpio = {0};
 
@@ -90,7 +92,7 @@ void gpio_init()
     gpio.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_11 | GPIO_Pin_12;
     GPIO_Init(GPIOB, &gpio);
     
-    // PC10 USB DP (btn2), PC11 USB DM (unused)
+    // PC16 USB DM (unused), PC17 USB DP (btn2)
     gpio.GPIO_Mode = GPIO_Mode_IPD;
     gpio.GPIO_Pin = GPIO_Pin_16 | GPIO_Pin_17;
     GPIO_Init(GPIOC, &gpio);
@@ -105,7 +107,7 @@ void gpio_init()
     // todo later
 }
 
-void awu_init()
+static inline void awu_init()
 {
     NVIC_InitTypeDef nvic;
     EXTI_InitTypeDef exti = {0};
@@ -174,12 +176,13 @@ int main(void)
 
         // stay a while
         // __WFI();
-        PWR_EnterSTANDBYMode();
+        // PWR_EnterSTANDBYMode();
     }
 }
 
 
 void AWU_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
+
 void AWU_IRQHandler(void)
 {
     // clear interrupt flag
@@ -204,5 +207,6 @@ void AWU_IRQHandler(void)
     // handle ADC
     adc_next();
 
-    // handle buttons
+    // handle buttons and touch sensors
+    btn_process();
 }