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52 lines
1.4 KiB
Markdown
52 lines
1.4 KiB
Markdown
[< back to index](../doc_index.md)
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## stdlib
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The `stdlib` module is automatically imported on most targets.
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#### `macro asm void poke(word const addr, byte register(a) value)`
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Stores a byte at given constant address. Will not be optimized away by the optimizer.
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#### `macro asm byte peek(word const addr)`
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Reads a byte from given constant address. Will not be optimized away by the optimizer.
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#### `macro asm void disable_irq()`
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Disables interrupts.
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#### `macro asm void enable_irq()`
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Enables interrupts.
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#### `byte hi_nibble_to_hex(byte register(a) value)`
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Returns an ASCII representation of the upper nibble of the given byte.
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#### `byte lo_nibble_to_hex(byte register(a) value)`
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Returns an ASCII representation of the lower nibble of the given byte.
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#### `macro asm void panic()`
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Crashes the program.
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## Standard macros available without any import
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#### `macro void memory_barrier()`
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Informs the optimizer that at this point arbitrary memory has been accessed and either read or written by an external device.
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The optimizer should not optimize any memory accesses across that macro.
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Available for: all targets.
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#### `macro void breakpoint()`
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If the `-fbreakpoints` option is selected (default), then it emits a memory barrier,
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and also outputs a breakpoint to the label file (if the format of the label file allows it).
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If the `-fno-breakpoints` option is selected, then it does nothing.
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Available for: all targets.
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