Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: [none]
• Core Version: [b080c50]
• Development Env: [Arduino IDE]
• Operating System: [Windows]

Settings in IDE

• Module: [Generic ESP8266 Module]
• Flash Mode: [dout]
• Flash Size: [1MB]
• lwip Variant: [v2 Lower Memory]
• Reset Method: [nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz]
• Upload Using: [SERIAL]
• Upload Speed: [115200] (serial upload only)

Problem Description

In esp8266_peri.h

#define U1S   ESP8266_REG(0xF1C) //STATUS
#define USDTR    39 //DTR PIN Level               <-- beyond the 4th byte (should be 29)

USDTR has been defined 39 as far back as 2015.

uart_register.h defines UART_DTRN as the intended bit 29.

#define UART_STATUS( i )                        (REG_UART_BASE( i ) + 0x1C)
#define UART_DTRN (BIT(29))