Uart Configuration

It can be understood from the data manual that SSD20X has a total of 4 serial ports, of which 3 are ordinary uart and one fuart with flow control function:

• Correspondence between serial port and device node
  #vi infinity2m.dtsi
  
  According to the following correspondence:

• Open the serial port
  Let’s take opening uart1 as an example to describe the configuration in the kernel when opening a common serial port.
  Change the status in DTS to ok:
  #vi infinity2m.dtsi
  
  Configure the corresponding pin as UART_MODE_1:
  #vi infinity2m-ssc011a-s01a-padmux-display.dtsi
  
  Load SStar Serial/UART driver:
  #cd kernel && ARCH=arm make menuconfig
  
• Test
  According to the corresponding relationship between the device node and the serial port, the device node corresponding to uart1 is /dev/ttyS1. Therefore, it is necessary to confirm whether /dev/ttyS1 exists first. If it exists, the node can be operated through the application program to conduct a communication test with the external serial device.