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devyte merged 2 commits into from
May 3, 2020
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Document USTX in USS/UxS not working as expected #7265

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Document USTX in USS/UxS not working as expected
xsrf May 3, 2020
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devyte May 3, 2020
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Document USTX in USS/UxS not working as expected 
Documentation that bit USTX in UART status register USS(u) / U0S / U1S is not mirroring TX level as expected but always reads 0, see issue #7256
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xsrf authored May 3, 2020
commit 5afff3a80e0c0a7acca881cbf0399593aab6052c
2 changes: 1 addition & 1 deletion cores/esp8266/esp8266_peri.h
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Expand Up @@ -250,7 +250,7 @@ extern volatile uint32_t* const esp8266_gpioToFn[16];
#define UIFF 0 //RX FIFO Full

//UART STATUS Registers Bits
#define USTX 31 //TX PIN Level
#define USTX 31 //TX PIN Level (Doesn't seem to work, always reads as 0 for both uarts. HW bug? Possible workaround: Enable loopback UxC0 |= 1<<UCLBE and read USRXD, see https://github.com/esp8266/Arduino/issues/7256 for discussion.)
#define USRTS 30 //RTS PIN Level
#define USDTR 39 //DTR PIN Level
#define USTXC 16 //TX FIFO COUNT (8bit)
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