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USART Flow Control doesn't work on WiFi SPWF01SA

Question asked by Fede Rico on Apr 20, 2018

Hi there,


I'm working on STM32F103 and a WiFi module SPWF01SA. I used the ST middleware and I can communicate with the WiFi module only without the Hardware Flow control.


I configured the USART1 with Flow Control using Cube32Mx

  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_RTS;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;


I copied this configuration from the example project. In fact this project use onlt the RTS pin.


I connected the WiFi CTS pin to the MCU RTS pin. and the WiFi RTS is unconnected.


The WiFi initialization works well until I send the command 

status = SET_Configuration_Value(CONSOLE1_HWFC, 1);

 After this command the WiFi module does not respond anymore.


Any suggestion?


Thanks for the help!