c_xxxx functions can be used to wrap a piece of text in a
$(COLOR_X)...$(COLOR_RESET) block, thereby avoiding the easy mistake
of forgetting to place a COLOR_RESET.
The escape codes and special chars now live in their own module. The
color module is only concerned with detecting whether to use colors or
not.
Additional variables are defined with hard a coded ESC char, a tab and a
newline. This removes the need for echo or printf.
The color strings COLOR_* are redefined so that they don't have to be
processed by "echo -e". This is done by storing the already interpreted
ANSI sequence in a shell variable.
With this change, not only can color messages be printed using normal
`echo` with no switches: colors also work with the `info` and `warning`
builtins of make.
The COLOR_ECHO variable is kept because it is also being used (confusingly)
to intepret tabs an newlines. This will be fixed in another commit.
This change should change absolutely anything and colors should still work
as always.
Matching on every free leads to flimsy test results where all memory
is freed but one line fails to be matched by pexpect, instead, match
the final count.
The esp8266 CPU has actually two hardware UART peripherals. UART0 is
used by the boot ROM for flashing and serial output during boot,
typically at a baudrate of 74880 bps until the bootloader or application
sets the more standard 115200 baudrate. This UART0 device has two
possible pins for TXD, GPIO1 and GPIO2, which are both set to TXD by the
boot ROM. esp8266 modules will typically have GPIO1 labeled as the TX
pin, but it is possible to use GPIO2 for that purpose even while
flashing the device with esptool.py.
The second device, UART1, also has two options for TXD, GPIO2 and GPIO7,
and only one option for RXD, GPIO8. However, GPIO7 and GPIO8 are used
by the flash internally so those options are not very useful unless
maybe while running from IRAM with the flash disabled, for example for
a debugger over UART1.
This patch allows boards to override UART{0,1}_{R,T}XD in their
periph_conf.h to configure the uart selection. Defining UART1_TX will
make the UART_DEV(1) device available.
Tested with:
```CFLAGS='-DUART1_TXD=GPIO2' make -C tests/periph_uart BOARD=esp8266-esp-12x flash term```
* Connected one USB-UART to the standard GPIO1 and GPIO3 for flashing
and console. After flashing we see the manual test output at 115200
bps
* Connected a second USB-UART with RX to GPIO2 running at 74880.
Then run on the first console:
```
> init 1 74880
> send 1 hello
```
The word "hello" appears on the second UART connection.
Note that GPIO2 is used during boot for UART0's TX until the application
or bootloader set it to a regular GPIO, so some boot ROM messages at
74880 bps are visible. After running `init 1 74880` it is set to UART1's
TX.
