From b033d53db305eb3f0aef336568cd69f8e8c536e1 Mon Sep 17 00:00:00 2001 From: whitequark Date: Thu, 3 Oct 2019 05:42:59 +0000 Subject: [PATCH] Factor out "sd_card_{1bit,4bit,spi}" resources. --- nmigen_boards/dev/sd.py | 46 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 nmigen_boards/dev/sd.py diff --git a/nmigen_boards/dev/sd.py b/nmigen_boards/dev/sd.py new file mode 100644 index 0000000..8fdbcbe --- /dev/null +++ b/nmigen_boards/dev/sd.py @@ -0,0 +1,46 @@ +from nmigen.build import * + + +__all__ = ["SDCardResources"] + + +def SDCardResources(*args, clk, cmd, dat0, dat1=None, dat2=None, dat3=None, + cd=None, wp=None, attrs=None): + resources = [] + + io_common = [] + if attrs is not None: + io_common.append(attrs) + if cd is not None: + io_common.append(Subsignal("cd", Pins(cd, dir="i", assert_width=1))) + if wp is not None: + io_common.append(Subsignal("wp", PinsN(wp, dir="i", assert_width=1))) + + io_native = list(io_common) + io_native.append(Subsignal("clk", Pins(clk, dir="o", assert_width=1))) + io_native.append(Subsignal("cmd", Pins(cmd, dir="o", assert_width=1))) + + io_1bit = list(io_native) + io_1bit.append(Subsignal("dat", Pins(dat0, dir="io", assert_width=1))) + if dat3 is not None: # works as electronic card detect + io_1bit.append(Subsignal("ecd", Pins(dat3, dir="i", assert_width=1))) + resources.append(Resource.family(*args, default_name="sd_card", ios=io_1bit, + name_suffix="1bit")) + + if dat1 is not None and dat2 is not None and dat3 is not None: + io_4bit = list(io_native) + io_4bit.append(Subsignal("dat", Pins(" ".join((dat0, dat1, dat2, dat3)), dir="io", + assert_width=4))) + resources.append(Resource.family(*args, default_name="sd_card", ios=io_4bit, + name_suffix="4bit")) + + if dat3 is not None: + io_spi = list(io_common) + io_spi.append(Subsignal("cs", PinsN(dat3, dir="io"))) # doubles as electronic card detect + io_spi.append(Subsignal("clk", Pins(clk, dir="o", assert_width=1))) + io_spi.append(Subsignal("mosi", Pins(cmd, dir="o", assert_width=1))) + io_spi.append(Subsignal("miso", Pins(dat0, dir="i", assert_width=1))) + resources.append(Resource.family(*args, default_name="sd_card", ios=io_spi, + name_suffix="spi")) + + return resources -- 2.30.2