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spi: Always delay for NSS setup time 

* Fixes the lack of setup time delay of an fixed-byte command that immediately follows an N-byte command.
* Extra 50ns will be inserted in-between fixed-byte commands but should be acceptable.
This commit is contained in:
Harry Ho 2021-06-23 12:48:13 +08:00
parent bb6824b944
commit fbcc3778d2
1 changed files with 1 additions and 7 deletions
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6
src/spi.rs
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@ -199,13 +199,7 @@ impl <SPI: Transfer<u8>,
self.nss.set_low(); self.nss.set_low();
// >=50ns min. CS_n setup time // >=50ns min. CS_n setup time
#[cfg(feature = "cortex-m-cpu")] #[cfg(feature = "cortex-m-cpu")]
match opcode {
opcodes::RCRU | opcodes::WCRU |
opcodes::RRXDATA | opcodes::WGPDATA => {
cortex_m::asm::delay((0.05*(self.cpu_freq_mhz+1.)) as u32); cortex_m::asm::delay((0.05*(self.cpu_freq_mhz+1.)) as u32);
}
_ => { }
}
// Start writing to SLAVE // Start writing to SLAVE
buf[0] = opcode; buf[0] = opcode;
let result = self.spi.transfer(&mut buf[..data_length+1]); let result = self.spi.transfer(&mut buf[..data_length+1]);