mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
ef080c0841
Both the TinyBasicPlus and the ESP32 variant don't use the THEN keyword in a IF statement
115 lines
3.0 KiB
ReStructuredText
115 lines
3.0 KiB
ReStructuredText
*****************
|
|
ESP32 ROM console
|
|
*****************
|
|
|
|
When an ESP32 is unable to boot from flash ROM (and the fuse disabling it hasn't been blown), it boots into a rom console. The console
|
|
is based on TinyBasic, and statements entered should be in the form of BASIC statements. As is common in the BASIC language, without a
|
|
preceeding line number, commands entered are executed immediately; lines with a prefixed line number are stored as part of a program.
|
|
|
|
Full list of supported statements and functions
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
System
|
|
------
|
|
|
|
- BYE - *exits Basic, reboots ESP32, retries booting from flash*
|
|
- END - *stops execution from the program, also "STOP"*
|
|
- MEM - *displays memory usage statistics*
|
|
- NEW - *clears the current program*
|
|
- RUN - *executes the current program*
|
|
|
|
IO, Documentation
|
|
-----------------
|
|
|
|
- PEEK( address ) - *get a 32-bit value from a memory address*
|
|
- POKE - *write a 32-bit value to memory*
|
|
- USR(addr, arg1, ..) - *Execute a machine language function*
|
|
- PRINT expression - *print out the expression, also "?"*
|
|
- PHEX expression - *print expression as a hex number*
|
|
- REM stuff - *remark/comment, also "'"*
|
|
|
|
Expressions, Math
|
|
-----------------
|
|
|
|
- A=V, LET A=V - *assign value to a variable*
|
|
- +, -, \*, / - *Math*
|
|
- <,<=,=,<>,!=,>=,> - *Comparisons*
|
|
- ABS( expression ) - *returns the absolute value of the expression*
|
|
- RSEED( v ) - *sets the random seed to v*
|
|
- RND( m ) - *returns a random number from 0 to m*
|
|
- A=1234 - * Assign a decimal value*
|
|
- A=&h1A2 - * Assign a hex value*
|
|
- A=&b1001 - *Assign a binary value*
|
|
|
|
Control
|
|
-------
|
|
|
|
- IF expression statement - *perform statement if expression is true*
|
|
- FOR variable = start TO end - *start for block*
|
|
- FOR variable = start TO end STEP value - *start for block with step*
|
|
- NEXT - *end of for block*
|
|
- GOTO linenumber - *continue execution at this line number*
|
|
- GOSUB linenumber - *call a subroutine at this line number*
|
|
- RETURN - *return from a subroutine*
|
|
- DELAY - *Delay a given number of milliseconds*
|
|
|
|
Pin IO
|
|
------
|
|
- IODIR - *Set a GPIO-pin as an output (1) or input (0)*
|
|
- IOSET - *Set a GPIO-pin, configured as output, to high (1) or low (0)*
|
|
- IOGET - *Get the value of a GPIO-pin*
|
|
|
|
|
|
Example programs
|
|
~~~~~~~~~~~~~~~~
|
|
|
|
Here are a few example commands and programs to get you started...
|
|
|
|
Read UART_DATE register of uart0
|
|
--------------------------------
|
|
|
|
::
|
|
|
|
> PHEX PEEK(&h3FF40078)
|
|
15122500
|
|
|
|
Set GPIO2 using memory writes to GPIO_OUT_REG
|
|
---------------------------------------------
|
|
|
|
Note: you can do this easier with the IOSET command
|
|
|
|
::
|
|
|
|
> POKE &h3FF44004,PEEK(&h3FF44004) OR &b100
|
|
|
|
Get value of GPIO0
|
|
------------------
|
|
|
|
::
|
|
|
|
> IODIR 0,0
|
|
> PRINT IOGET(0)
|
|
0
|
|
|
|
Blink LED
|
|
---------
|
|
|
|
Hook up an LED between GPIO2 and ground. When running the program, the LED should blink 10 times.
|
|
|
|
::
|
|
|
|
10 IODIR 2,1
|
|
20 FOR A=1 TO 10
|
|
30 IOSET 2,1
|
|
40 DELAY 250
|
|
50 IOSET 2,0
|
|
60 DELAY 250
|
|
70 NEXT A
|
|
RUN
|
|
|
|
Credits
|
|
~~~~~~~
|
|
|
|
The ROM console is based on "TinyBasicPlus" by Mike Field and Scott Lawrence, which is based on "68000 TinyBasic" by Gordon Brandly
|
|
|