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simplify jump offset calculation when loading PIO programs

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This commit is contained in:
Jan Niehusmann 2022-09-15 20:41:25 +00:00
parent ae629ad4c9
commit 7cca9a71d7
1 changed files with 7 additions and 16 deletions
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23
rp2040-hal/src/pio.rs
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@ -195,26 +195,17 @@ impl<P: PIOExt> PIO<P> {
.iter() .iter()
.cloned() .cloned()
.map(|instr| { .map(|instr| {
if let Some(Instruction { if instr & 0b1110_0000_0000_0000 == 0 {
operands: InstructionOperands::JMP { condition, address }, // this is a JMP instruction -> add offset to address
delay, let address = (instr & 0b11111) as usize;
side_set, let address = address + offset;
}) = Instruction::decode(instr, p.side_set)
{
// JMP instruction. We need to apply offset here
let address = address + offset as u8;
assert!( assert!(
address < pio::RP2040_MAX_PROGRAM_SIZE as u8, address < pio::RP2040_MAX_PROGRAM_SIZE,
"Invalid JMP out of the program after offset addition" "Invalid JMP out of the program after offset addition"
); );
instr & (!0b11111) | address as u16
Instruction {
operands: InstructionOperands::JMP { condition, address },
delay,
side_set,
}
.encode(p.side_set)
} else { } else {
// this is not a JMP instruction -> keep it unchanged
instr instr
} }
}) })