Re #1875 and #1849: implemented LCD initialization for low temperatures. Initialization skipped in case of watchdog reset or boot-loader exit.

radio/src/bootloader/boot.cpp

@@ -485,7 +485,15 @@ int main()
   start_timer0();
 #endif
 
+#if defined(PCBTARANIS)
+  init_hw_timer();            //needed for lcdInitxxx()
+  lcdInitStart();
+  //nothing to do here
+  lcdInitFinish();
+#else
   lcdInit();
+#endif 
+
 #if defined(PCBSKY9X)
   extern uint8_t OptrexDisplay;
   OptrexDisplay = 1;
@@ -505,7 +513,6 @@ int main()
 #endif
   keysInit();
   I2C_EE_Init();
-  init_hw_timer();
 #endif
 
   __enable_irq();
@@ -789,6 +796,7 @@ int main()
     }
 
     if (pwrCheck() == e_power_off && state != ST_FLASHING && state != ST_USB) {
+      lcdOff();    // this drains LCD caps
       pwrOff();
       for (;;) {
         // Wait for power to go off
@@ -797,6 +805,9 @@ int main()
 
     if (state == ST_REBOOT) {
       if ((~readKeys() & 0x7E) == 0) {
+        lcd_clear();
+        lcdRefresh();
+        RCC->CSR |= RCC_CSR_RMVF;   //clear the reset flags in RCC clock control & status register
         NVIC_SystemReset();
       }
     }

radio/src/lcd.h

@@ -282,9 +282,16 @@ void lcd_img(coord_t x, coord_t y, const pm_uchar * img, uint8_t idx, LcdFlags a
 #endif
 
 void lcdSetRefVolt(unsigned char val);
-void lcdInit();
 void lcd_clear();
 void lcdSetContrast();
+#if defined(PCBTARANIS)
+  void lcdInitStart();
+  void lcdInitFinish();
+  void lcdOff();
+#else
+  void lcdInit();
+  #define lcdOff()
+#endif
 
 #if defined(PCBTARANIS) && defined(REVPLUS) && !defined(SIMU)
   void lcdRefresh(bool wait=true);

radio/src/opentx.cpp

@@ -2872,16 +2872,18 @@ uint16_t stack_free()
 
 void opentxInit(OPENTX_INIT_ARGS)
 {
-#if defined(PCBTARANIS) && !defined(SIMU)
+  eeReadAll();
-  CoTickDelay(100);   //200ms
+
-  lcdInit();
+#if defined(CPUARM)
-  lcdSetRefVolt(g_eeGeneral.contrast);
+  if (UNEXPECTED_SHUTDOWN())
-  BACKLIGHT_ON();
+    unexpectedShutdown = 1;
-  CoTickDelay(20);  //20ms
-  Splash();
 #endif
 
-  eeReadAll();
+#if defined(PCBTARANIS)
+  lcdInitFinish();
+  BACKLIGHT_ON();
+  Splash();
+#endif
 
 #if MENUS_LOCK == 1
   getMovedSwitch();
@@ -2890,12 +2892,10 @@ void opentxInit(OPENTX_INIT_ARGS)
   }
 #endif
 
-#if defined(CPUARM)
-  if (UNEXPECTED_SHUTDOWN())
-    unexpectedShutdown = 1;
-#endif
-
 #if defined(VOICE)
+#if defined(CPUARM)
+  currentSpeakerVolume = requiredSpeakerVolume = g_eeGeneral.speakerVolume+VOLUME_LEVEL_DEF;
+#endif
   setVolume(g_eeGeneral.speakerVolume+VOLUME_LEVEL_DEF);
 #endif
 

radio/src/targets/taranis/aspi.c

@@ -54,8 +54,8 @@ void AspiCmd(u8 Command_Byte)
     LCD_A0_LOW();
 
     LCD_CLK_HIGH();
-    __no_operation();
+    LCD_CLK_HIGH();
-    LCD_NCS_LOW();  
+    LCD_NCS_LOW();
  
     while (i--) {
       LCD_CLK_LOW();
@@ -66,9 +66,11 @@ void AspiCmd(u8 Command_Byte)
         LCD_MOSI_LOW();
 
       Command_Byte <<= 1;
+      LCD_CLK_LOW(); \
+      LCD_CLK_LOW(); \
 
       LCD_CLK_HIGH();
-      __no_operation();
+      LCD_CLK_HIGH();
     }
 
     LCD_NCS_HIGH();  
@@ -104,6 +106,7 @@ void AspiData(u8 Para_data)
 {
     int i=8;
     LCD_CLK_HIGH();
+    LCD_CLK_HIGH();
     LCD_A0_HIGH();
     LCD_NCS_LOW();
     while (i--) {
@@ -113,9 +116,11 @@ void AspiData(u8 Para_data)
         else
           LCD_MOSI_LOW();
         Para_data <<= 1;
-        __no_operation();
+        LCD_CLK_LOW();
+        LCD_CLK_LOW();
+
+        LCD_CLK_HIGH();
         LCD_CLK_HIGH();
-        __no_operation();
     }
     LCD_NCS_HIGH();
     LCD_A0_HIGH();  

radio/src/targets/taranis/board_taranis.cpp

@@ -128,6 +128,7 @@ void boardInit()
   keysInit();
   adcInit();
   delaysInit();
+  lcdInitStart();
   audioInit();
   init2MhzTimer();
   init5msTimer();

radio/src/targets/taranis/board_taranis.h

@@ -185,6 +185,8 @@ void checkRotaryEncoder();
 void watchdogInit(unsigned int duration);
 #define wdt_enable(x)   watchdogInit(1500)
 #define wdt_reset()     IWDG->KR = 0xAAAA
+#define WAS_RESET_BY_WATCHDOG()   (RCC->CSR & (RCC_CSR_WDGRSTF | RCC_CSR_WWDGRSTF))
+#define WAS_RESET_BY_SOFTWARE()   (RCC->CSR & RCC_CSR_SFTRSTF)
 #endif
 
 // ADC driver

radio/src/targets/taranis/lcd_driver.cpp

@@ -16,18 +16,28 @@
 
 #if defined(REVPLUS)
   #define CONTRAST_OFS 160
+  #define RESET_WAIT_DELAY_MS      300        //wait time after LCD reset before first command
 #else
   #define CONTRAST_OFS 5
+  #define RESET_WAIT_DELAY_MS     1300        //wait time after LCD reset before first command
 #endif
 
-//275us
+#if defined(BOOT)
-void Delay(volatile unsigned int ms)
+  extern void hw_delay(uint16_t time);
+#endif
+
+/*
+  In boot-loader: init_hw_timer() must be called before the first call to this function!
+  In opentx: delaysInit() must be called before the first call to this function!
+*/
+static void Delay(uint32_t ms)
 {
-  volatile u8 i;
+  while(ms--) {
-  while(ms != 0) {
+#if !defined(BOOT)
-    for(i=0;i<250;i++) {}
+    delay_01us(10000);
-    for(i=0;i<75;i++) {}
+#else
-    ms--;
+    hw_delay(10000);
+#endif
   }
 }
 
@@ -110,6 +120,7 @@ static void LCD_Init()
 static void LCD_Init()
 {	
   AspiCmd(0x2B);   //Panel loading set ,Internal VLCD.
+  Delay(20);
   AspiCmd(0x25);   //Temperature compensation curve definition: 0x25 = -0.05%/oC
   AspiCmd(0xEA);	//set bias=1/10 :Command table NO.27
   AspiCmd(0x81);	//Set Vop
@@ -157,7 +168,9 @@ void Set_Address(u8 x, u8 y)
   else \
     LCD_MOSI_LOW(); \
   LCD_CLK_LOW(); \
-  __no_operation(); \
+  LCD_CLK_LOW(); \
+  LCD_CLK_LOW(); \
+  LCD_CLK_HIGH(); \
   LCD_CLK_HIGH();
 
 #if defined(REVPLUS)
@@ -298,35 +311,69 @@ static void LCD_Hardware_Init()
   GPIO_Init(GPIO_LCD_RST, &GPIO_InitStructure);
 }
 
-void LCD_OFF()
+/*
+  Proper method for turning of LCD module. It must be used,
+  otherwise we might damage LCD crystals in the long run!
+*/
+void lcdOff()
 {
-  AspiCmd(0xE2);
+  AspiCmd(0xE2);    //system reset
-  Delay(20);	
+  Delay(3);	        //wait for caps to drain
 }
 
-void lcdInit()
+/*
+  Starts LCD initialization routine. It should be called as
+  soon as possible after the reset because LCD takes a lot of
+  time to properly power-on.
+
+  Make sure that Delay() is functional before calling this function!
+*/
+void lcdInitStart()
 {
   LCD_BL_Config();
   LCD_Hardware_Init();
+
+  if (WAS_RESET_BY_WATCHDOG()|WAS_RESET_BY_SOFTWARE()) return;    //no need to reset LCD module
+
+  //reset LCD module
+  LCD_RST_LOW();
+  Delay(1);       // only 3 us needed according to data-sheet, we use 1 ms
+  LCD_RST_HIGH();
+}
+
+/*
+  Finishes LCD initialization. Must be called after the lcdInitStart().
+*/
+void lcdInitFinish()
+{
 #if defined(REVPLUS)
-  initLcdSpi() ;
+  initLcdSpi();
 #endif
   
-  LCD_RST_HIGH();
+  if (WAS_RESET_BY_WATCHDOG()|WAS_RESET_BY_SOFTWARE()) return;    //no need to initialize LCD module
-  Delay(5);
 
-  LCD_RST_LOW();
+  /*
-  Delay(120); //11ms
+    LCD needs longer time to initialize in low temperatures. The data-sheet 
+    mentions a time of at least 150 ms. The delay of 1300 ms was obtained 
+    experimentally. It was tested down to -10 deg Celsius.
+
+    The longer initialization time seems to only be needed for regular Taranis, 
+    the Taranis Plus has been reported by users to work without any problems.
+    Therefore the delay for T+ is lower.
+    
+    If radio is reset by watchdog or boot-loader LCD initialization is skipped,
+    because it was already initialized in previous run.
+  */
+
+#if !defined(BOOT)
+  while(g_tmr10ms < (RESET_WAIT_DELAY_MS/10)) {};    //wait measured from the power-on
+#else
+  Delay(RESET_WAIT_DELAY_MS);
+#endif
 
-  LCD_RST_HIGH();
-  Delay(2500);
- 
-  AspiCmd(0xE2);
-  Delay(2500);
   LCD_Init();
-  Delay(120);
-
   AspiCmd(0xAF);	//dc2=1, IC into exit SLEEP MODE, dc3=1 gray=ON, dc4=1 Green Enhanc mode disabled
+  Delay(20);      //needed for internal DC-DC converter startup
 }
 
 void lcdSetRefVolt(uint8_t val)

radio/src/tasks_arm.cpp

@@ -166,7 +166,7 @@ void menusTask(void * pdata)
 
   lcd_clear();
   lcdRefresh();
-  lcdSetRefVolt(0);
+  lcdOff();
 
 #if !defined(SIMU)
   SysTick->CTRL = 0; // turn off systick