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

PIO at maximum speed

Browse Source
This commit is contained in:
kbleeke 2023-03-28 16:51:49 +02:00
parent 781c7f978c
commit 869b337715
1 changed files with 3 additions and 3 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" "set pindirs, 0 side 0"
// these nops seem to be necessary for fast clkdiv // these nops seem to be necessary for fast clkdiv
"nop side 1" "nop side 1"
"nop side 0"
"nop side 1" "nop side 1"
// read in y-1 bits // read in y-1 bits
"lp2:" "lp2:"
@ -70,11 +71,10 @@ where
sm.write_instr(relocated.origin() as usize, relocated.code()); sm.write_instr(relocated.origin() as usize, relocated.code());
// theoretical maximum according to data sheet, 100Mhz Pio => 50Mhz SPI Freq // 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 // same speed as pico-sdk, 62.5Mhz
sm.set_clkdiv(0x0200); // sm.set_clkdiv(0x0200);
// 32 Mhz // 32 Mhz
// sm.set_clkdiv(0x03E8); // sm.set_clkdiv(0x03E8);