stm32h7/linum-stm32h753bi: Added documentation of linum-stm32h753bi board.

Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>

Documentation/platforms/arm/stm32h7/boards/linum-stm32h753bi/index.rst

@@ -0,0 +1,382 @@
+=================
+linum-stm32h753bi
+=================
+
+This page discusses issues unique to NuttX configurations for the
+LINUM-STM32H753BI board.
+
+.. figure:: linum-stm32h753bi-top.jpg
+   :align: center
+
+.. figure:: linum-stm32h753bi-bottom.jpg
+   :align: center
+
+Board information
+=================
+
+This board was release by Witte Tenology in 2023 and developed based on
+STM32H753BI microcontroller. The board has 2 expansion connectors used by the LCD display with 
+touchscreen and another for access to other peripherals of microcontroller.
+
+The board features:
+- 8 to 52V power supply
+- SWD Pins for use as STLink (Pin header) and TC2030-IDC 6-Pin Tag-Connect Plug-of-Nails™ Connector
+- Crystal for HS 25MHz
+- Crystal for RTC 32.768KHz
+- 1 UART serial for debug
+- 1 Led RGB
+- 1 Buzzer without internal oscilator
+- 1 Mono audio up to 3W
+- 1 Ethernet 10/100
+- 1 MicroSD connector supporting 1 or 4-bit bus
+- 1 USB 2.0 Host/Device
+- 1 EEPROM memory with 512K bits
+- 1 External SRAM memory with 8MB
+- 1 NOR memory with 16MB
+- 2 On-board RS232 Transceiver with RTS/CTS
+- 2 On-board RS485 Transceiver
+- 2 On-board CAN-FD Transceiver
+
+Expansion connector 1 features:
+- 1 Display RBG 888 
+- 1 Capacitive Touchscreen sensor
+
+Expansion connector 2 features.
+- 1 SPI
+- 1 I2C
+- 1 One Wire
+- 2 DACs
+- 6 PWM Channels
+- 10 ADCs
+
+Board documentation:
+https://github.com/witte-technology/...
+
+LEDs
+====
+
+The LINUM-STM32H753BI has 3 software controllable LEDs.
+
+  ======= =====
+  LED RGB PINS
+  ======= =====
+  LED_R   PG2
+  LED_G   PG3
+  LED_B   PB2  
+  ======= =====
+
+UART/USART
+==========
+
+The LINUM-STM32H753BI used the USART1 for serial debug messages.
+
+USART1
+------
+
+  ====== =====
+  USART1 PINS
+  ====== =====
+  TX     PB14
+  RX     PB15 
+  ====== =====
+
+The LINUM-STM32H753BI board has two on-board RS-232 transceiver connected to USART2 and USART3.
+
+  ====== =====
+  USART2 PINS
+  ====== =====
+  TXD    PD5
+  RXD    PD6
+  CTS    PD3
+  RTS    PD4
+  ====== =====
+
+  ====== =====
+  USART3 PINS
+  ====== =====
+  TXD    PB10
+  RXD    PB11
+  CTS    PD11
+  RTS    PD12
+  ====== =====
+
+The LINUM-STM32H753BI board has two on-board RS-485 transceiver connected to USART4 and USART6.
+
+  ====== =====
+  UART4 PINS
+  ====== =====
+  TXD    PB9
+  RXD    PB8
+  DE     PA15
+  ====== =====
+
+  ====== =====
+  USART6 PINS
+  ====== =====
+  TXD    PC6
+  RXD    PC7
+  DE     PG12  
+  ====== =====
+  
+SDCARD
+======
+
+The LINUM-STM32H753BI has one SDCard slot connected as below:
+
+  ========== =====
+  SDMMC1       PINS
+  ========== =====
+  SDMMC_D0    PC8
+  SDMMC_D1    PC9
+  SDMMC_D2    PC10
+  SDMMC_D3    PC11
+  SDMMC_DK    PC12
+  ========== =====
+
+  =============== =====
+  GPIO            PINS
+  =============== =====
+  SDCARD_DETECTED PG7
+  =============== =====      
+
+ETHERNET
+========
+
+The LINUM-STM32H753BI has a ethernet connection using the transceiver KSZ8081RNACA.
+
+  ============ =====
+  ETH          PINS
+  ============ =====
+  ETH_REF_CLK  PA1
+  ETH_MDIO     PA2
+  ETH_CRS_DV   PA7
+  ETH_MDC      PC1
+  ETH_RXD0     PC4
+  ETH_RXD1     PC5
+  ETH_TX_EN    PG11
+  ETH_TXD0     PG13
+  ETH_TXD1     PG14
+  ETH_CLK      PA8
+  ETH_RESET    PI4
+  ============ =====
+
+CAN-FD
+========
+
+The LINUM-STM32H753BI board has two on-board CAN-FD transceiver connected to FDCAN1 and FDCAN2.
+
+  ====== =====
+  FDCAN1 PINS
+  ====== =====
+  TXD    PH13
+  RXD    PH14
+  STD    PI2  
+  ====== =====
+
+  ====== =====
+  FDCAN2 PINS
+  ====== =====
+  TXD    PB13
+  RXD    PB12
+  STD    PE3  
+  ====== =====
+
+USB
+============
+
+The LINUM-STM32H753BI has one usb port.
+
+  ======= =====
+  USB     PINS
+  ======= =====
+  USB_N   PA11
+  USB_P   PA12
+  USB_EN  PI12
+  USB_FLT PI13
+  ======= =====
+
+QUADSPI
+==============
+
+The LINUM-STM32H753BI board has one NOR memory connected to QUADSPI.
+The NOR memory used is the W25Q128JV with 16MB
+
+  ======= =====
+  QUADSPI PINS
+  ======= =====
+  IO0     PF8
+  IO1     PF9
+  IO2     PF7
+  IO3     PF6
+  CLK     PF10
+  NCS     PG6
+  ======= =====
+  
+I2C3
+============
+The LINUM-STM32H753BI connects the EEPROM memory and the touchscreen sensor to I2C3.
+
+  ====== =====
+  I2C3   PINS
+  ====== =====
+  SCL    PH7
+  SDA    PH8
+  ====== =====
+
+EEPROM MEMORY
+--------------
+
+EEPROM memory used is the 24LC256 with 256Kb.
+
+TOUCHSCREEN SENSOR
+------------------
+
+The touchscreen sensor used is the GT928.
+
+  ======== =====
+  GPIO     PINS
+  ======== =====
+  TS_RESET PI7
+  TS_ISR   PH9
+  ========  =====
+
+I2C4
+=======
+The I2C4 is available for general use on the expansion connector.
+  
+  ====== =====
+  I2C4   PINS
+  ====== =====
+  SCL    PH11
+  SDA    PH12
+  ====== =====
+
+External SDRAM
+==============
+The LINUM-STM32H753BI has a external SDRAM with 16Mbits connected to FMC peripheral.
+
+  =========== =====
+  FMC         PINS
+  =========== =====
+  FMC_A0      PF0
+  FMC_A1      PF1
+  FMC_A2      PF2
+  FMC_A3      PF3
+  FMC_A4      PF4
+  FMC_A5      PF5
+  FMC_A6      PF12
+  FMC_A7      PF13
+  FMC_A8      PF14
+  FMC_A9      PF15
+  FMC_A10     PG0
+  FMC_A11     PG1
+  FMC_BA0     PG4
+  FMC_BA1     PG5
+  FMC_D0      PD14
+  FMC_D1      PD15
+  FMC_D2      PD0
+  FMC_D3      PD1
+  FMC_D4      PE7
+  FMC_D5      PE8
+  FMC_D6      PE9
+  FMC_D7      PE10
+  FMC_D8      PE11
+  FMC_D9      PE12
+  FMC_D10     PE13
+  FMC_D11     PE14
+  FMC_D12     PE15
+  FMC_D13     PD8
+  FMC_D14     PD9
+  FMC_D15     PD10
+  FMC_NBL0    PE0
+  FMC_NBL1    PE1
+  FMC_SDCKE0  PC3
+  FMC_SDCLK   PG8
+  FMC_SDNCAS  PG15
+  FMC_SDNEO   PC2
+  FMC_SDNRAS  PF11
+  FMC_SDNWE   PC0
+  =========== =====
+
+LCD
+=======
+The LINUM-STM32H753BI use the LTDC to suport one LCD with RGB connection.
+
+  =========== =====
+  LTDC        PINS
+  =========== =====
+  LTDC_B0     PF0
+  LTDC_B1     PJ13
+  LTDC_B2     PJ14
+  LTDC_B3     PJ15
+  LTDC_B4     PK3
+  LTDC_B5     PK4
+  LTDC_B6     PK5
+  LTDC_B7     PK6
+  LTDC_CLK    PI14
+  LTDC_DE     PK7
+  LTDC_G0     PJ7
+  LTDC_G1     PJ8
+  LTDC_G2     PJ9
+  LTDC_G3     PJ10
+  LTDC_G4     PJ11
+  LTDC_G5     PK0
+  LTDC_G6     PK1
+  LTDC_G7     PK2
+  LTDC_HSYNC  PI10
+  LTDC_R0     PI15
+  LTDC_R1     PJ0
+  LTDC_R2     PJ1
+  LTDC_R3     PJ2
+  LTDC_R4     PJ3
+  LTDC_R5     PJ4
+  LTDC_R6     PJ5
+  LTDC_R7     PJ6
+  LTDC_VSYNC  PI9
+  =========== =====
+
+  ============= =====
+  PWM           PINS
+  ============= =====
+  PWM_BACKLIGHT PH6
+
+I2S
+=======
+The LINUM-STM32H753BI has one I2S output.
+
+  ======== =====
+  I2S2     PINS
+  ======== =====
+  I2S2_WS  PI0
+  I2S2_CK  PI1
+  I2S2_SDO PI3
+  ======== =====
+
+BUZZER
+=======
+The LINUM-STM32H753BI has a buzzer without internal oscilator
+
+  ======= =====
+  GPIO    PINS
+  ======= =====
+  BUZZER  PC13  
+  ======= =====
+
+==============
+
+Each linum-stm32h753bi configuration is maintained in a sub-directory and
+can be selected as follow::
+
+    tools/configure.sh linum-stm32h753bi:<subdir>
+
+  Where <subdir> is one of the following:
+
+
+Configuration Directories
+-------------------------
+
+nsh
+---
+
+Configures the NuttShell (nsh) located at apps/examples/nsh. This
+configuration enables a serial console on UART1.