fix(pa01): backlight related issues (#6826)

radio/src/edgetx.cpp

@@ -1414,8 +1414,6 @@ void edgeTxInit()
   lcdSetContrast();
 #endif
 
-  BACKLIGHT_ENABLE(); // we start the backlight during the startup animation
-
 #if defined(STARTUP_ANIMATION)
   if (WAS_RESET_BY_WATCHDOG_OR_SOFTWARE()) {
     pwrOn();
@@ -1498,7 +1496,6 @@ void edgeTxInit()
 
   currentBacklightBright = requiredBacklightBright = g_eeGeneral.getBrightness();
 
-
   referenceSystemAudioFiles();
   audioQueue.start();
   BACKLIGHT_ENABLE();

radio/src/targets/pa01/backlight_driver.cpp

@@ -52,9 +52,10 @@ void backlightLowInit()
 
 void backlightInit()
 {
-  stm32_pulse_init(&_bl_timer, 10000);
+  stm32_pulse_init(&_bl_timer, 100*20000);
   stm32_pulse_config_output(&_bl_timer, true, LL_TIM_OCMODE_PWM1, 0);
   LL_TIM_SetAutoReload(_bl_timer.TIMx, 100);
+  stm32_pulse_set_cmp_val(&_bl_timer, 0);
   LL_TIM_EnableCounter(_bl_timer.TIMx);
 }
 

radio/src/targets/pa01/hal.h

@@ -269,7 +269,7 @@
 #define LCD_SPI_CLK                     GPIO_PIN(GPIOG, 11)
 #define LCD_SPI_MOSI                    GPIO_PIN(GPIOB,  5)
 #define LCD_SPI_MISO                    GPIO_PIN(GPIOG,  9)
-#define LCD_SPI_BAUD                    100000000
+#define LCD_SPI_BAUD                    50000000
 
 // Backlight
 #define BACKLIGHT_GPIO                  GPIO_PIN(GPIOB, 03) // TIM2_CH2