fix(bsp)

README.md

@@ -20,7 +20,7 @@ cargo run
 ## Build
 
 ```bash
-cargo build --release --target thumbv6m-none-eabi --no-default-features
+cargo build --release --target thumbv6m-none-eabi
 ```
 
 ## Pins
@@ -46,12 +46,20 @@ cargo build --release --target thumbv6m-none-eabi --no-default-features
 * SDA: I2C
 * SCL: I2C
 
-3 pins for the display SPI, 3 pins for the 74HC565 (keypad), 3 pins for the 74HC165 (keypad)
+Used pins:
+* display SPI: 3 pins
+* keypad: 6 pins (74HC565+75HC165), maybe 5 if the same clock is used
+* display LED: 1 pin
+* torch LED: 1 pin
+* ESP UART: 2 pins (I2C still possible if not enough pins)
+
+Note: at most 5 outputs of the 74HC565 may be used as GPO.
 
 ## components
 https://www.makerfabs.com/maduino-zero-4g-lte-sim7600.html
 https://www.waveshare.com/1.54inch-e-Paper-Module.htm1
 https://bulkmemorycards.com/shop/microsd-cards/microsd-32gb/sd-32gb-class-10/32gb-microsd-ultra-sandisk-memory-card-2/
+Maybe an ESP for WIFI and Bluetooth.
 
 ## crates
 bitmap-font ?