max/embassy
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge pull request #57 from kbleeke/faster-pio2

Browse Source 
Maximum pio speed
This commit is contained in:
Dario Nieuwenhuis 2023-03-30 10:21:51 +00:00 committed by GitHub
commit d3fb9ddf33
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
cyw43-pio/src/lib.rs
View File

@ -43,6 +43,7 @@ where
"set pindirs, 0 side 0"
// these nops seem to be necessary for fast clkdiv
"nop side 1"
"nop side 0"
"nop side 1"
// read in y-1 bits
"lp2:"
@ -70,11 +71,10 @@ where
sm.write_instr(relocated.origin() as usize, relocated.code());
// theoretical maximum according to data sheet, 100Mhz Pio => 50Mhz SPI Freq
// does not work yet,
// sm.set_clkdiv(0x0140);
sm.set_clkdiv(0x0140);
// same speed as pico-sdk, 62.5Mhz
sm.set_clkdiv(0x0200);
// sm.set_clkdiv(0x0200);
// 32 Mhz
// sm.set_clkdiv(0x03E8);

2
src/bus.rs
View File

@ -74,7 +74,7 @@ where
// 32-bit word length, little endian (which is the default endianess).
self.write32_swapped(
REG_BUS_CTRL,
WORD_LENGTH_32 | HIGH_SPEED | INTERRUPT_HIGH | WAKE_UP | STATUS_ENABLE,
WORD_LENGTH_32 | HIGH_SPEED | INTERRUPT_HIGH | WAKE_UP | STATUS_ENABLE | INTERRUPT_WITH_STATUS,
)
.await;

3
src/consts.rs
View File

@ -16,7 +16,8 @@ pub(crate) const WORD_LENGTH_32: u32 = 0x1;
pub(crate) const HIGH_SPEED: u32 = 0x10;
pub(crate) const INTERRUPT_HIGH: u32 = 1 << 5;
pub(crate) const WAKE_UP: u32 = 1 << 7;
pub(crate) const STATUS_ENABLE: u32 = 0x10000;
pub(crate) const STATUS_ENABLE: u32 = 1 << 16;
pub(crate) const INTERRUPT_WITH_STATUS: u32 = 1 << 17;
// SPI_STATUS_REGISTER bits
pub(crate) const STATUS_DATA_NOT_AVAILABLE: u32 = 0x00000001;