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[READ-ONLY] Mirror of https://github.com/SantaClaas/embedded-fan-control.
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1.2 kB · 42 lines
Rust
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/// Originally an experiment at a simpler data type to represent a modbus messagepub(crate) struct WriteHoldingRegister([u8; 8]);
impl WriteHoldingRegister { pub(crate) fn new( device_address: modbus::device::Address, register_address: modbus::register::Address, value: u16, ) -> Self { let register_address = register_address.to_be_bytes(); let mut data = [ *device_address, modbus::function::code::WRITE_SINGLE_REGISTER, register_address[0], register_address[1], (value >> 8) as u8, value as u8, // CRC set in next step 0, 0, ];
let checksum = modbus::CRC.checksum(&data[..6]).to_be_bytes();
// They come out reversed (or is us using to_be_bytes reversed?) data[6] = checksum[1]; data[7] = checksum[0]; Self(data) }
pub(crate) fn device_address(&self) -> modbus::device::Address { self.0[0].into() }}
impl AsRef<[u8]> for WriteHoldingRegister { fn as_ref(&self) -> &[u8] { &self.0 }}