Swap continuity_2 and bl_lcd lines We need a free timer to PWM the backlight, and we cannot use any alternate function on PA6 as would conflict with SPI1 MISO. Move bl_lcd to PA1, which is TIM2_CH2. Move continuity_2 to PA6, as that is a simple GPIO pin. Signed-off-by: Keith Packard <keithp@keithp.com>