pico: tufty2350 leds

32blit-pico/board/pimoroni_tufty2350/config.cmake

diff --git a/32blit-pico/board/pimoroni_tufty2350/config.cmake b/32blit-pico/board/pimoroni_tufty2350/config.cmake
index 59043a1..8f06250 100644
--- a/32blit-pico/board/pimoroni_tufty2350/config.cmake
+++ b/32blit-pico/board/pimoroni_tufty2350/config.cmake
@@ -2,3 +2,4 @@
 
 blit_driver(display dbi)
 blit_driver(input gpio)
+blit_driver(led pwm_mono)

32blit-pico/board/pimoroni_tufty2350/config.h

diff --git a/32blit-pico/board/pimoroni_tufty2350/config.h b/32blit-pico/board/pimoroni_tufty2350/config.h
index f32fd79..90f416d 100644
--- a/32blit-pico/board/pimoroni_tufty2350/config.h
+++ b/32blit-pico/board/pimoroni_tufty2350/config.h
@@ -22,13 +22,12 @@
 
 #define LCD_TRANSPOSE 1
 
-// there are white LEDs
-
 #define DEFAULT_I2C_CLOCK 400000
 
+#define LED_MONO_PINS 0, 1, 2, 3
+
 #define USB_VENDOR_ID 0x2E8A
 #define USB_PRODUCT_ID 0x1101
 
 #define USB_VENDOR_STR "Pimoroni"
 #define USB_PRODUCT_STR "Tufty 2350"
-