113 lines
3 KiB
ReStructuredText
113 lines
3 KiB
ReStructuredText
ESP32 ROM console
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=================
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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
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is based on TinyBasic, and statements entered should be in the form of BASIC statements. As is common in the BASIC language, without a
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preceeding line number, commands entered are executed immediately; lines with a prefixed line number are stored as part of a program.
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Full list of supported statements and functions
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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System
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------
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- BYE - *exits Basic, reboots ESP32, retries booting from flash*
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- END - *stops execution from the program, also "STOP"*
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- MEM - *displays memory usage statistics*
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- NEW - *clears the current program*
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- RUN - *executes the current program*
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IO, Documentation
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-----------------
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- PEEK( address ) - *get a 32-bit value from a memory address*
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- POKE - *write a 32-bit value to memory*
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- USR(addr, arg1, ..) - *Execute a machine language function*
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- PRINT expression - *print out the expression, also "?"*
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- PHEX expression - *print expression as a hex number*
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- REM stuff - *remark/comment, also "'"*
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Expressions, Math
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-----------------
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- A=V, LET A=V - *assign value to a variable*
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- +, -, \*, / - *Math*
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- <,<=,=,<>,!=,>=,> - *Comparisons*
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- ABS( expression ) - *returns the absolute value of the expression*
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- RSEED( v ) - *sets the random seed to v*
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- RND( m ) - *returns a random number from 0 to m*
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- A=1234 - * Assign a decimal value*
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- A=&h1A2 - * Assign a hex value*
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- A=&b1001 - *Assign a binary value*
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Control
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-------
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- IF expression THEN statement - *perform statement if expression is true*
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- FOR variable = start TO end - *start for block*
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- FOR variable = start TO end STEP value - *start for block with step*
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- NEXT - *end of for block*
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- GOTO linenumber - *continue execution at this line number*
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- GOSUB linenumber - *call a subroutine at this line number*
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- RETURN - *return from a subroutine*
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- DELAY - *Delay a given number of milliseconds*
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Pin IO
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------
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- IODIR - *Set a GPIO-pin as an output (1) or input (0)*
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- IOSET - *Set a GPIO-pin, configured as output, to high (1) or low (0)*
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- IOGET - *Get the value of a GPIO-pin*
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Example programs
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~~~~~~~~~~~~~~~~
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Here are a few example commands and programs to get you started...
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Read UART_DATE register of uart0
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--------------------------------
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::
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> PHEX PEEK(&h3FF40078)
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15122500
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Set GPIO2 using memory writes to GPIO_OUT_REG
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---------------------------------------------
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Note: you can do this easier with the IOSET command
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::
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> POKE &h3FF44004,PEEK(&h3FF44004) OR &b100
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Get value of GPIO0
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------------------
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::
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> IODIR 0,0
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> PRINT IOGET(0)
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0
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Blink LED
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---------
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Hook up an LED between GPIO2 and ground. When running the program, the LED should blink 10 times.
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::
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10 IODIR 2,1
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20 FOR A=1 TO 10
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30 IOSET 2,1
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40 DELAY 250
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50 IOSET 2,0
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60 DELAY 250
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70 NEXT A
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RUN
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Credits
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~~~~~~~
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The ROM console is based on "TinyBasicPlus" by Mike Field and Scott Lawrence, which is based on "68000 TinyBasic" by Gordon Brandly
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