adafruit-mirror/arduino-pico
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Delay LRCK to falling edge of BCK in I2S input (#2592)

Browse source 
In input mode, LRCK needs to change on falling edge of BCK

Fixes #2584.
This commit is contained in:
JimMacA 2024-11-09 15:44:15 -05:00 committed by GitHub
parent f5c4136b94
commit 64156c42b1
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
2 changed files with 9 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
libraries/I2S/src/pio_i2s.pio
View file

@ -162,13 +162,13 @@ right1:
left1:
in pins, 1 side 0b01
jmp x--, left1 side 0b00
in pins, 1 side 0b11 ; Last bit of left has WCLK change per I2S spec
in pins, 1 side 0b01 ; 2584 LRCK stays low until BCLK goes low
; Last bit of left has WCLK change per I2S spec
mov x, y side 0b10
right1:
in pins, 1 side 0b11
jmp x--, right1 side 0b10
in pins, 1 side 0b01 ; Last bit of right also has WCLK change
in pins, 1 side 0b11 ; 2584 LRCK stays high until BCLK goes low
; Loop back to beginning...
@ -184,13 +184,13 @@ right1:
left1:
in pins, 1 side 0b10
jmp x--, left1 side 0b00
in pins, 1 side 0b11 ; Last bit of left has WCLK change per I2S spec
in pins, 1 side 0b10 ;2584 LRCK stays low until BCLK goes low
mov x, y side 0b01
right1:
in pins, 1 side 0b11
jmp x--, right1 side 0b01
in pins, 1 side 0b10 ; Last bit of right also has WCLK change
in pins, 1 side 0b11 ; 2584 LRCK stays high until BCLK goes low
; Loop back to beginning...

8
libraries/I2S/src/pio_i2s.pio.h
View file

@ -286,11 +286,11 @@ static const uint16_t pio_i2s_in_program_instructions[] = {
0xa022, // 0: mov x, y side 0
0x4801, // 1: in pins, 1 side 1
0x0041, // 2: jmp x--, 1 side 0
0x5801, // 3: in pins, 1 side 3
0x4801, // 3: in pins, 1 side 1
0xb022, // 4: mov x, y side 2
0x5801, // 5: in pins, 1 side 3
0x1045, // 6: jmp x--, 5 side 2
0x4801, // 7: in pins, 1 side 1
0x5801, // 7: in pins, 1 side 3
// .wrap
};
@ -326,11 +326,11 @@ static const uint16_t pio_i2s_in_swap_program_instructions[] = {
0xa022, // 0: mov x, y side 0
0x5001, // 1: in pins, 1 side 2
0x0041, // 2: jmp x--, 1 side 0
0x5801, // 3: in pins, 1 side 3
0x5001, // 3: in pins, 1 side 2
0xa822, // 4: mov x, y side 1
0x5801, // 5: in pins, 1 side 3
0x0845, // 6: jmp x--, 5 side 1
0x5001, // 7: in pins, 1 side 2
0x5801, // 7: in pins, 1 side 3
// .wrap
};