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vfs: support for blocking reads, more newline conversion options

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Previously VFS driver for UART could only use simple non-blocking
functions to read from and write to the UART. UART driver provides more
complex blocking and interrupt-driven functions, which can be used
instead.
This commit adds optional support for using UART driver's functions.

Also added is a more flexible mechanism for configuring newline
conversion rules on input and output.

This commit also fixes a bug that all UARTs shared one static variable
used as a character buffer in newline conversion code. This variable is
changed to be per-UART.
This commit is contained in:
Ivan Grokhotkov
2017-08-15 16:23:23 +08:00
parent a8075ea140
commit 489c523870
4 changed files with 279 additions and 62 deletions
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53
components/esp32/Kconfig
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@@ -179,20 +179,53 @@ config IPC_TASK_STACK_SIZE
It can be shrunk if you are sure that you do not use any custom
IPC functionality.
config NEWLIB_STDOUT_ADDCR
bool "Standard-out output adds carriage return before newline"
default y
choice NEWLIB_STDOUT_LINE_ENDING
prompt "Line ending for UART output"
default NEWLIB_STDOUT_LINE_ENDING_CRLF
help
Most people are used to end their printf strings with a newline. If this
is sent as is to the serial port, most terminal programs will only move the
cursor one line down, not also move it to the beginning of the line. This
is usually done by an added CR character. Enabling this will make the
standard output code automatically add a CR character before a LF.
This option allows configuring the desired line endings sent to UART
when a newline ('\n', LF) appears on stdout.
Three options are possible:
With this option enabled, C standard library functions which read from UART
(like scanf) will convert "\r\n" character sequences back to "\n".
CRLF: whenever LF is encountered, prepend it with CR
LF: no modification is applied, stdout is sent as is
CR: each occurence of LF is replaced with CR
This option doesn't affect behavior of the UART driver (drivers/uart.h).
config NEWLIB_STDOUT_LINE_ENDING_CRLF
bool "CRLF"
config NEWLIB_STDOUT_LINE_ENDING_LF
bool "LF"
config NEWLIB_STDOUT_LINE_ENDING_CR
bool "CR"
endchoice
choice NEWLIB_STDIN_LINE_ENDING
prompt "Line ending for UART input"
default NEWLIB_STDIN_LINE_ENDING_CR
help
This option allows configuring which input sequence on UART produces
a newline ('\n', LF) on stdin.
Three options are possible:
CRLF: CRLF is converted to LF
LF: no modification is applied, input is sent to stdin as is
CR: each occurence of CR is replaced with LF
This option doesn't affect behavior of the UART driver (drivers/uart.h).
config NEWLIB_STDIN_LINE_ENDING_CRLF
bool "CRLF"
config NEWLIB_STDIN_LINE_ENDING_LF
bool "LF"
config NEWLIB_STDIN_LINE_ENDING_CR
bool "CR"
endchoice
config NEWLIB_NANO_FORMAT
bool "Enable 'nano' formatting options for printf/scanf family"