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authorLuke T. Shumaker <lukeshu@lukeshu.com>2025-02-24 22:54:30 -0700
committerLuke T. Shumaker <lukeshu@lukeshu.com>2025-03-04 00:10:03 -0700
commitc336bf7f2205131c86e6d2991770a2c150d85ca9 (patch)
tree963a91e278aaaa7ea7648a5e00043aca40ba8731 /gdb-helpers
parentfb73355711c99003c559df48164a1ce6db93cff9 (diff)
libhw: rp2040_hwspi: Use DMA
Diffstat (limited to 'gdb-helpers')
-rw-r--r--gdb-helpers/rp2040.py112
1 files changed, 112 insertions, 0 deletions
diff --git a/gdb-helpers/rp2040.py b/gdb-helpers/rp2040.py
index 9e10d73..983e13b 100644
--- a/gdb-helpers/rp2040.py
+++ b/gdb-helpers/rp2040.py
@@ -3,6 +3,8 @@
# Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
+import typing
+
import gdb
@@ -115,6 +117,7 @@ class RP2040ShowInterrupts(gdb.Command):
def invoke(self, arg: str, from_tty: bool) -> None:
self.arm_cortex_m0plus_registers()
self.arm_cortex_m0plus_mmregisters()
+ self.rp2040_dma_mmregisters()
def arm_cortex_m0plus_mmregisters(self) -> None:
base: int = 0xE0000000
@@ -181,5 +184,114 @@ xPSR : {fmt32(psr) } {{Application,Execution,Interrupt}
)
)
+ def rp2040_dma_mmregisters(self) -> None:
+ base: int = 0x50000000
+
+ def fmt12(x: int) -> str:
+ s = fmt32(x)
+ return s[:-12] + "_" + s[-12:]
+
+ print(
+ box(
+ "RP2040 DMA memory-mapped registers",
+ f"""
+
+ 8 4 0
+ ┌──┴───┴───┤
+INTR : {fmt12(read_mmreg(base + 0x400))} Raw
+ │ │ │ │
+INTE0: {fmt12(read_mmreg(base + 0x404))} IRQ_DMA_0 Enable
+INTF0: {fmt12(read_mmreg(base + 0x408))} IRQ_DMA_0 Force
+INTS0: {fmt12(read_mmreg(base + 0x40c))} IRQ_DMA_0 Status
+ │ │ │ │
+INTE1: {fmt12(read_mmreg(base + 0x414))} IRQ_DMA_1 Enable
+INTF1: {fmt12(read_mmreg(base + 0x418))} IRQ_DMA_1 Force
+INTS1: {fmt12(read_mmreg(base + 0x41c))} IRQ_DMA_1 Status
+""",
+ )
+ )
+
RP2040ShowInterrupts()
+
+
+class RP2040ShowDMA(gdb.Command):
+ """Show the RP2040's DMA control registers."""
+
+ def __init__(self) -> None:
+ super(RP2040ShowDMA, self).__init__("rp2040-show-dma", gdb.COMMAND_USER)
+
+ def invoke(self, arg: str, from_tty: bool) -> None:
+ base: int = 0x50000000
+ u32_size: int = 4
+
+ nchan = read_mmreg(base + 0x448)
+
+ def chreg(
+ ch: int,
+ name: typing.Literal[
+ "read_addr",
+ "write_addr",
+ "trans_count",
+ "ctrl",
+ "dbg_ctdreq",
+ "dbg_tcr",
+ ],
+ ) -> int:
+ fieldcnt: int = 4 * 4
+ fieldnum: int
+ debug = False
+ match name:
+ case "read_addr":
+ fieldnum = 0
+ case "write_addr":
+ fieldnum = 1
+ case "trans_count":
+ fieldnum = 2
+ case "ctrl":
+ fieldnum = 4
+ case "dbg_ctdreq":
+ fieldnum = 0
+ debug = True
+ case "dbg_tcr":
+ fieldnum = 1
+ debug = True
+ return read_mmreg(
+ base
+ + (0x800 if debug else 0)
+ + (ch * u32_size * fieldcnt)
+ + (u32_size * fieldnum)
+ )
+
+ def ctrl(ch: int) -> str:
+ s = fmt32(chreg(ch, "ctrl"))
+ return s[:10] + "_" + s[10:]
+
+ def chaddr(ch: int, name: typing.Literal["read", "write"]) -> str:
+ val = chreg(ch, name + "_addr") # type: ignore
+ if val == 0:
+ return "NULL "
+ return f"0x{val:08x}"
+
+ ret = f"""
+ ╓sniff_enable
+ ║╓bswap
+ ║║╓irq_quiet
+ ║║║ ┌treq_sel
+ ║║║ │ ┌chain_to
+ ║║║ │ │ ╓ring_sel
+ ║║║ │ │ ║ ┌ring_size
+ ║║║ │ │ ║ │ ╓incr_write
+ busy╖ ║║║ │ │ ║ │ ║╓incr_read
+write_err╖ ║ ║║║ │ │ ║ │ ║║┌data_size
+read_err╖║ ║ ║║║ │ │ ║ │ ║║│ ╓high_priority
+ahb_err╖║║ ║ ║║║ │ │ ║ │ ║║│ ║╓enable
+ ║║║ ║ ║║║ │ │ ║ │ ║║│ ║║ trans_cnt
+ ║║║ ║ ║║║┌─┴──┐┌┴─┐║┌┴─┐║║├┐║║ read_addr write_addr cur/reload
+"""
+ for ch in range(0, nchan):
+ ret += f"{ch: 3}: {ctrl(ch)} {chaddr(ch, 'read')} {chaddr(ch, 'write')} {chreg(ch, 'trans_count')}/{chreg(ch, 'dbg_tcr')}\n"
+ print(box("RP2040 DMA channels", ret))
+
+
+RP2040ShowDMA()