Cannot send data from MCU to ESP on STM32F401 and ESP8266-01

By Aiyu ·
Tags: Hardware
I am working on an STM32f401 Nucleo board(datasheet for reference: and ESP8266-01 wifi module.
I am using Eclipse gcc-arm tool chain and cubeMx to generate code. I can transfer and receive data perfectly with USART/UART DMA.

Now I am stuck with ESP8266-01. I cannot send data from MCU to ESP and I'm not getting response from ESP to MCU. I already tested the ESP module communication, I can concnect TO THE wifi with AT commands through USB and can also receive data in web via socket connection.

BTW,I configured USART1_TX/USART1_RX with PA9/PA10
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