README
======

This README discusses issues unique to NuttX configurations for the
AT32F437-MINI development board featuring the AT32F437VMT7
MCU. The AT32F437VMT7 is a 288MHz Cortex-M4 operation with 4Mbyte Flash
memory and 384kbytes. 


LEDs
====
  LED1 = PE2
  LED2 = PE3

USART/UART
====
  USART1
    RX = PA10
    TX = PA9
  The usart1 is used for console.
  ./tools/configure.sh at32f437-mini/nsh
  make -j16 and flash nuttx.hex,then run it will show:
    NuttShell (NSH) NuttX-12.2.1
    nsh> 
    nsh> 
    nsh> ps
      PID GROUP PRI POLICY   TYPE    NPX STATE    EVENT     SIGMASK           STACK COMMAND
        0     0   0 FIFO     Kthread N-- Ready              0000000000000000 001016 Idle_Task
        2     2 100 RR       Task    --- Running            0000000000000000 002016 nsh_main
    nsh> 

  USART2/RS485
    RX =  PD6
    TX =  PD5  
    DIR = PD4

CAN
====
  CAN1
    TX = PD1
    RX = PD0
  CAN_CHARDRIVER: ./tools/configure.sh at32f437-mini/can_char
  CAN_SOCKET: ./tools/configure.sh at32f437-mini/can_socket

USB
====
  OTGFS1
    D+ = PA12
    D- = PA11

SDIO
====
  SDIO1
    CMD = PD2
    CLK = PC12
    D0 =  PC8
    D1 =  PC9
    D2 =  PC10
    D3 =  PC11    

ETH
  RMII_REF_CLK =  PA1
  ETH_MDIO =      PA2
  RMII_CRS_DV =   PA7
  ETH_MDC =       PC1
  RMII_RXD0 =     PC4
  RMII_RXD1 =     PC5
  RMII_TX_EN =    PB11
  RMII_TXD0 =     PB12
  RMII_TXD1 =     PB13
  ETH_RST =       PA3
  The eth used lan8720a as phy


W25QXX
  CLK =  PB3
  MISO = PB4
  MOSI = PB5
  CS =   PD7  

RTC
The board used rtc device on chip

PWM
The pwm test with tim20 chanel1 in PE2

ADC
  ADC1 chanel8(PB0)