Add pinout for RT-4D

Author: marcoSchr

cspell.yaml

@@ -120,6 +120,11 @@ words:
   - otadata
   - ffat
   - Radtel
+  - KEYOUT
+  - KEYIN
+  - NRST
+  - BACKLED
+  - APCOUT
 patterns:
   - name: markdown_code_block
     pattern: /^\s*```[\s\S]*?^\s*```/gm

hardware/rt4d.md

@@ -9,6 +9,59 @@
 * Display: 128x64 monochrome TFT
 * 0x2800 Byte Bootloader
 
+## Pinout
+
+| Pin Number | Pin Name | Usage           |
+|------------|----------|-----------------|
+| 1          | V_DD     |                 |
+| 2          | PC13     | SCK1080         |
+| 3          | PC14     | SDA1080         |
+| 4          | PC15     | FM POWER-EN     |
+| 5          | PF0      | KEYOUT3         |
+| 6          | PF1      | KEYIN1          |
+| 7          | NRST     |                 |
+| 8          | V_SSA    |                 |
+| 9          | V_DDA    |                 |
+| 10         | PA0      | KEYOUT1         |
+| 11         | PA1      | KEYOUT2         |
+| 12         | PA2      | AF MUTE4898     |
+| 13         | PA3      | BACKLED-EN      |
+| 14         | PA4      | AUDIO           |
+| 15         | PA5      | TX DTMF         |
+| 16         | PA6      | DIG-RXD         |
+| 17         | PA7      | DIG-TXD         |
+| 18         | PB0      | KEYOUT4         |
+| 19         | PB1      | DIG POWER-EN    |
+| 20         | PB2      | LOW BATTERY DET |
+| 21         | PB10     | DIG/ANA SW      |
+| 22         | PB11     | KEYIN4          |
+| 23         | PF8      | DIG/ANA AF-SW   |
+| 24         | V_DD     |                 |
+| 25         | PB12     | W25Q-CS         |
+| 26         | PB13     | W25Q-SCK        |
+| 27         | PB14     | W25Q-DO         |
+| 28         | PB15     | W25Q-DI         |
+| 29         | PA8      | KEYIN2          |
+| 30         | PA9      | KEYIN3          |
+| 31         | PA10     | UV APCOUT-SW    |
+| 32         | PA11     | TXD             |
+| 33         | PA12     | RXD/PTT         |
+| 34         | PA13     | TX-LED/PDA      |
+| 35         | PF6      | LCD-RST         |
+| 36         | V_DD     |                 |
+| 37         | PA14     | RX-LED/PCK      |
+| 38         | PA15     | LCD-CS          |
+| 39         | PB3      | LCD-SCK         |
+| 40         | PB4      | LCD-CD          |
+| 41         | PB5      | LCD-SDA         |
+| 42         | PB6      | DCS-DET         |
+| 43         | PB7      | SDA4819         |
+| 44         | BOOT0    |                 |
+| 45         | PB8      | SCN4819         |
+| 46         | PB9      | SCK4819         |
+| 47         | V_SS     |                 |
+| 48         | V_DD     |                 |
+
 ## Pictures
 
 ### PCB Front