Increase button debounce time

src/startup/init.c

@@ -40,25 +40,29 @@ void Sys_Init() {
 	// HIRC clock (internal RC 22.1184MHz)
 	CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
 	CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
-
+
+	// LIRC clock (internal RC 10kHz)
+	CLK_EnableXtalRC(CLK_PWRCTL_LIRCEN_Msk);
+	CLK_WaitClockReady(CLK_STATUS_LIRCSTB_Msk);
+
 	// HCLK clock source: HIRC, HCLK source divider: 1
 	CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
-	
+
 	// HXT clock (external XTAL 12MHz)
 	CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
 	CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);
-	
+
 	// Enable 72MHz optimization
 	FMC_EnableFreqOptimizeMode(FMC_FTCTL_OPTIMIZE_72MHZ);
-	
+
 	// Core clock: PLL
 	CLK_SetCoreClock(PLL_CLOCK);
 	CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk);
-	
+
 	// SPI0 clock: PCLK0
 	CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL2_SPI0SEL_PCLK0, 0);
 	CLK_EnableModuleClock(SPI0_MODULE);
-	
+
 	// TMR0-3 clock: HXT
 	CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0SEL_HXT, 0);
 	CLK_SetModuleClock(TMR1_MODULE, CLK_CLKSEL1_TMR1SEL_HXT, 0);
@@ -76,17 +80,17 @@ void Sys_Init() {
 	// USBD clock
 	CLK_SetModuleClock(USBD_MODULE, 0, CLK_CLKDIV0_USB(3));
 	CLK_EnableModuleClock(USBD_MODULE);
-	
+
 	// Enable USB 3.3V LDO
 	SYS->USBPHY = SYS_USBPHY_LDO33EN_Msk;
 
 	// EADC clock: 72Mhz / 8
 	CLK_SetModuleClock(EADC_MODULE, 0, CLK_CLKDIV0_EADC(8));
 	CLK_EnableModuleClock(EADC_MODULE);
-	
+
 	// Enable BOD (reset, 2.2V)
 	SYS_EnableBOD(SYS_BODCTL_BOD_RST_EN, SYS_BODCTL_BODVL_2_2V);
-	
+
 	// Update system core clock
 	SystemCoreClockUpdate();
 
@@ -95,13 +99,12 @@ void Sys_Init() {
 	Dataflash_Init();
 
 	// Setup debounce, used both by buttons and battery presence pin.
-	// Buttons only need 100us, while at least 200us is needed by
+	// Good buttons only need 100us, while at least 200us is needed by
 	// battery presence. The original firmware uses 100ms for battery and
 	// timer-based debounce for buttons, but that's excessive.
-	// 200us will work fine for both. Button debounce isn't really noticeable
-	// up to 128 LIRC clock cycles, so this can be upped if battery presence
-	// is unstable.
-	GPIO_SET_DEBOUNCE_TIME(GPIO_DBCTL_DBCLKSRC_LIRC, GPIO_DBCTL_DBCLKSEL_2);
+	// Older buttons need more debouncing (a few ms). Button debounce
+	// isn't really noticeable up to 128 LIRC clock cycles.
+	GPIO_SET_DEBOUNCE_TIME(GPIO_DBCTL_DBCLKSRC_LIRC, GPIO_DBCTL_DBCLKSEL_32);
 
 	// Initialize I/O
 	Display_SetupSPI();