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Allow signals to settle on REQ pulse #92

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merged 1 commit into from
Nov 2, 2023
Merged

Allow signals to settle on REQ pulse #92

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1 change: 1 addition & 0 deletions lib/BlueSCSI_platform_RP2040/scsi_accel_host.pio
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@

start:
wait 0 gpio REQ side 1 ; Wait for REQ low
nop [1] side 1 ; Wait for signals to settle
in pins, 9 side 0 ; Assert ACK, read GPIO
in null, 7 side 0 ; Padding bits
wait 1 gpio REQ side 0 ; Wait for REQ high
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13 changes: 7 additions & 6 deletions lib/BlueSCSI_platform_RP2040/scsi_accel_host.pio.h
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Original file line number Diff line number Diff line change
Expand Up @@ -13,24 +13,25 @@
// -------------------- //

#define scsi_host_async_read_wrap_target 0
#define scsi_host_async_read_wrap 6
#define scsi_host_async_read_wrap 7

static const uint16_t scsi_host_async_read_program_instructions[] = {
// .wrap_target
0x90a0, // 0: pull block side 1
0xb027, // 1: mov x, osr side 1
0x3013, // 2: wait 0 gpio, 19 side 1
0x4009, // 3: in pins, 9 side 0
0x4067, // 4: in null, 7 side 0
0x2093, // 5: wait 1 gpio, 19 side 0
0x1042, // 6: jmp x--, 2 side 1
0xb142, // 3: nop side 1 [1]
0x4009, // 4: in pins, 9 side 0
0x4067, // 5: in null, 7 side 0
0x2093, // 6: wait 1 gpio, 19 side 0
0x1042, // 7: jmp x--, 2 side 1
// .wrap
};

#if !PICO_NO_HARDWARE
static const struct pio_program scsi_host_async_read_program = {
.instructions = scsi_host_async_read_program_instructions,
.length = 7,
.length = 8,
.origin = -1,
};

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