From: Patrick O'Doherty <p@trickod.com>
Date: Sun, 20 Sep 2020 17:51:31 +0000 (-0700)
Subject: Initial port to Feather M4
X-Git-Url: https://git.patrickod.com/eurorack.community/commit/?a=commitdiff_plain;h=2c5a6ce701efb11787525a42b6ced9957e32e6ca;p=keywing-rs.git

Initial port to Feather M4

Changes:
 * Update the SPI and i2c bus initialization to use the handy feather_m4 hal
   helper methods.
 * Hack out some timer code in the invalid key handler due to differences in
   timer/delay API to return to later.
 * update memory.x referencing the atsamd feather_m4 board definition &
   reserving 1KB for panic dumping
---

diff --git a/.gitmodules b/.gitmodules
index 8971b25..415292f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,9 +1,6 @@
 [submodule "ili9341-rs"]
 	path = ili9341-rs
 	url = git@github.com:jamesmunns/ili9341-rs.git
-[submodule "nrf-hal"]
-	path = nrf-hal
-	url = git@github.com:jamesmunns/nrf-hal.git
 [submodule "bbq10kbd"]
 	path = bbq10kbd
 	url = https://github.com/jamesmunns/bbq10kbd
diff --git a/keywing/.cargo/config b/keywing/.cargo/config
index 5673fa9..fd7ff15 100644
--- a/keywing/.cargo/config
+++ b/keywing/.cargo/config
@@ -1,9 +1,9 @@
+# vim:ft=toml:
+[target.thumbv7em-none-eabihf]
+runner = 'arm-none-eabi-gdb'
+
 [build]
 target = "thumbv7em-none-eabihf"
-
-[target.thumbv7em-none-eabihf]
-# runner = 'gdbgui -g arm-none-eabi-gdb --gdb-args="-command=debug.gdb"'
-runner = "arm-none-eabi-gdb -tui -q -x debug.gdb"
 rustflags = [
-    "-C", "link-arg=-Tlink.x",
+   "-C", "link-arg=-Tlink.x",
 ]
diff --git a/keywing/Cargo.lock b/keywing/Cargo.lock
index 56bb412..7761169 100644
--- a/keywing/Cargo.lock
+++ b/keywing/Cargo.lock
@@ -2,19 +2,47 @@
 # It is not intended for manual editing.
 [[package]]
 name = "aligned"
-version = "0.3.1"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "as-slice 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "as-slice 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "as-slice"
-version = "0.1.0"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stable_deref_trait 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "atsamd-hal"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "atsamd51j19a 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitfield 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "embedded-hal 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "paste 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcell 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "atsamd51j19a"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bare-metal 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m-rt 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcell 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -29,50 +57,47 @@ dependencies = [
 name = "bbq10kbd"
 version = "0.1.0"
 dependencies = [
- "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "embedded-hal 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "byteorder"
-version = "1.3.2"
+name = "bitfield"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "cast"
-version = "0.2.3"
+name = "byteorder"
+version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "cortex-m"
-version = "0.6.2"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aligned 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aligned 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "bare-metal 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitfield 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "volatile-register 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cortex-m-rt"
-version = "0.6.10"
+version = "0.6.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cortex-m-rt-macros 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m-rt-macros 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "r0 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cortex-m-rt-macros"
-version = "0.1.6"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -80,25 +105,28 @@ name = "embedded-graphics"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "embedded-hal"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "fpa"
-version = "0.1.0"
+name = "feather_m4"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cast 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atsamd-hal 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m-rt 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "embedded-hal 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -106,7 +134,7 @@ name = "generic-array"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -114,7 +142,7 @@ name = "generic-array"
 version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -122,17 +150,18 @@ name = "hash32"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "heapless"
-version = "0.5.1"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "as-slice 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "as-slice 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "generic-array 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash32 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stable_deref_trait 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -140,101 +169,88 @@ name = "ili9341"
 version = "0.3.0"
 dependencies = [
  "embedded-graphics 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "embedded-hal 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "nb"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "nrf-hal-common"
-version = "0.10.0"
+name = "keywing"
+version = "0.1.0"
 dependencies = [
- "cast 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "fpa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "nb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "nrf52840-pac 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bbq10kbd 0.1.0",
+ "cortex-m 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m-rt 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "embedded-graphics 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "embedded-hal 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "feather_m4 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapless 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ili9341 0.3.0",
+ "nb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "panic-persist 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rtt-target 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "nrf52840-hal"
-version = "0.10.0"
+name = "nb"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cast 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "nb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "nrf-hal-common 0.10.0",
- "nrf52840-pac 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nb 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "nrf52840-pac"
-version = "0.9.0"
+name = "nb"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bare-metal 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m-rt 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "vcell 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
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 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cortex-m 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "proc-macro2"
-version = "1.0.6"
+name = "paste"
+version = "0.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "paste-impl 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "quote"
-version = "1.0.2"
+name = "paste-impl"
+version = "0.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "r0"
-version = "0.2.2"
+name = "proc-macro-hack"
+version = "0.5.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "rand"
-version = "0.5.6"
+name = "proc-macro2"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "rand_core"
-version = "0.3.1"
+name = "quote"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "rand_core"
-version = "0.4.2"
+name = "r0"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -244,12 +260,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "rtt-target"
-version = "0.2.0"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cortex-m 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ufmt-write 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "vcell 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -275,39 +290,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "stable_deref_trait"
-version = "1.1.1"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "1.0.8"
+version = "1.0.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "tiny-nrf52"
-version = "0.1.0"
-dependencies = [
- "bbq10kbd 0.1.0",
- "cortex-m 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m-rt 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "embedded-graphics 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapless 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "ili9341 0.3.0",
- "nb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "nrf52840-hal 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "panic-persist 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rtt-target 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "typenum"
-version = "1.11.2"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -317,7 +315,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "unicode-xid"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -339,41 +337,42 @@ dependencies = [
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 [metadata]
-"checksum aligned 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d3a316c7ea8e1e9ece54862c992def5a7ac14de9f5832b69d71760680efeeefa"
-"checksum as-slice 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "293dac66b274fab06f95e7efb05ec439a6b70136081ea522d270bc351ae5bb27"
+"checksum aligned 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c19796bd8d477f1a9d4ac2465b464a8b1359474f06a96bb3cda650b4fca309bf"
+"checksum as-slice 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "37dfb65bc03b2bc85ee827004f14a6817e04160e3b1a28931986a666a9290e70"
+"checksum atsamd-hal 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a845093b449700f878b8a91323e10307577e28f29f37c859645eaba2e655a60f"
+"checksum atsamd51j19a 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f3710f797630bb6fd7ab101e057e9a9f43342e86727867b03c76dfd42c20a05b"
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-"checksum byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a7c3dd8985a7111efc5c80b44e23ecdd8c007de8ade3b96595387e812b957cf5"
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-"checksum cortex-m 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2954942fbbdd49996704e6f048ce57567c3e1a4e2dc59b41ae9fde06a01fc763"
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diff --git a/keywing/Cargo.toml b/keywing/Cargo.toml
index e1f5723..b5fdcac 100644
--- a/keywing/Cargo.toml
+++ b/keywing/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
-name = "tiny-nrf52"
+name = "keywing"
 version = "0.1.0"
-authors = ["James Munns <james.munns@ferrous-systems.com>"]
+authors = ["Patrick O'Doherty <p@trickod.com>"]
 edition = "2018"
 
 [dependencies]
@@ -21,15 +21,14 @@ path = "../ili9341-rs"
 version = "0.1.0"
 path = "../bbq10kbd"
 
-[dependencies.nrf52840-hal]
-version = "0.10.0"
-features = ["rt"]
-
 [dependencies.panic-persist]
 version = "0.2.1"
 default-features = false
 features = ["utf8"]
 
+[dependencies.feather_m4]
+version = "0.5.0"
+
 [profile.dev]
 lto             = true
 panic           = "abort"
@@ -39,12 +38,6 @@ codegen-units   = 1
 opt-level       = 0
 
 [profile.release]
-lto             = true
-panic           = "abort"
-debug           = true
-incremental     = false
-codegen-units   = 1
-opt-level       = 's'
-
-[patch.crates-io]
-nrf-hal-common = { path = "../nrf-hal/nrf-hal-common" }
+debug = true
+lto = true
+opt-level = "s"
\ No newline at end of file
diff --git a/keywing/Embed.toml b/keywing/Embed.toml
deleted file mode 100644
index 918f48c..0000000
--- a/keywing/Embed.toml
+++ /dev/null
@@ -1,46 +0,0 @@
-[probe]
-# The index of the probe in the connected probe list.
-probe_index = 0
-# The protocol to be used for communicating with the target.
-protocol = "Swd"
-# The speed in kHz of the data link to the target.
-# speed = 1337
-
-[flashing]
-# Whether or not the target should be flashed.
-enabled = true
-# Whether or not the target should be halted after flashing.
-halt_afterwards = false
-# Whether or not bytes erased but not rewritten with data from the ELF
-# should be restored with their contents before erasing.
-restore_unwritten_bytes = false
-# The path where an SVG of the assembled flash layout should be written to.
-# flash_layout_output_path = "out.svg"
-
-[general]
-# The chip name of the chip to be debugged.
-chip = "nRF52840_xxAA"
-# A list of chip descriptions to be loaded during runtime.
-chip_descriptions = []
-# The default log level to be used.
-log_level = "Warn"
-
-[rtt]
-# Whether or not an RTTUI should be opened after flashing.
-# This is exclusive and cannot be used with GDB at the moment.
-enabled = true
-# A list of channel associations to be displayed. If left empty, all channels are displayed.
-channels = [
-    # { up = 0, down = 0, name = "name" }
-]
-# The duration in ms for which the logger should retry to attach to RTT.
-timeout = 3000
-# Whether timestamps in the RTTUI are enabled
-show_timestamps = true
-
-[gdb]
-# Whether or not a GDB server should be opened after flashing.
-# This is exclusive and cannot be used with RTT at the moment.
-enabled = false
-# The connection string in host:port format wher the GDB server will open a socket.
-# gdb_connection_string
diff --git a/keywing/memory.x b/keywing/memory.x
index 46f1278..bbbe065 100644
--- a/keywing/memory.x
+++ b/keywing/memory.x
@@ -1,10 +1,13 @@
 MEMORY
 {
-  /* NOTE K = KiBi = 1024 bytes */
-  FLASH : ORIGIN  = 0x00000000, LENGTH = 1M
-  RAM : ORIGIN    = 0x20000000, LENGTH = 255K
-  PANDUMP: ORIGIN = 0x2003FC00, LENGTH = 1K
+  /* Leave 16k for the default bootloader on the Feather M4 */
+  FLASH (rx)   : ORIGIN = 0x00000000 + 16K, LENGTH = 512K - 16K
+  /* Usually 192K RAM. Reserve 1K at the end for storing panic dumps */
+  RAM (xrw)    : ORIGIN = 0x20000000, LENGTH = 191K
+  PANDUMP (rw) : ORIGIN = 0x20000000 + 191K, LENGTH = 1K
 }
 
+_stack_start = ORIGIN(RAM) + LENGTH(RAM);
 _panic_dump_start = ORIGIN(PANDUMP);
-_panic_dump_end = ORIGIN(PANDUMP) + LENGTH(PANDUMP);
+_panic_dump_end   = ORIGIN(PANDUMP) + LENGTH(PANDUMP);
+
diff --git a/keywing/src/main.rs b/keywing/src/main.rs
index 2397fa8..28841c1 100644
--- a/keywing/src/main.rs
+++ b/keywing/src/main.rs
@@ -7,15 +7,16 @@ use panic_persist as _;
 // Used to set the program entry point
 use cortex_m_rt::entry;
 
-// Provides definitions for our development board
-use nrf52840_hal::{
-    gpio::{p0::Parts as P0Parts, p1::Parts as P1Parts, Level},
-    prelude::*,
-    spim::{Frequency as SpimFrequency, Pins as SpimPins, MODE_0},
-    target::Peripherals,
-    twim::{Frequency as TwimFrequency, Pins as TwimPins},
-    Clocks, Rng, Spim, Timer, Twim,
-};
+extern crate feather_m4 as hal;
+
+use hal::prelude::*;
+use hal::clock::GenericClockController;
+use hal::pac::{CorePeripherals,Peripherals};
+use hal::trng::Trng;
+use hal::delay::Delay;
+use hal::Pins;
+use hal::{i2c_master,spi_master};
+use hal::time::U32Ext;
 
 use rtt_target::{rprintln, rtt_init_print};
 
@@ -41,11 +42,19 @@ fn main() -> ! {
 }
 
 fn inner_main() -> Result<(), &'static str> {
-    let board = Peripherals::take().ok_or("Error getting board!")?;
-    let mut timer = Timer::new(board.TIMER0);
-    let mut delay = Timer::new(board.TIMER1);
-    let mut _rng = Rng::new(board.RNG);
-    let _clocks = Clocks::new(board.CLOCK).enable_ext_hfosc();
+    let mut peripherals = Peripherals::take().ok_or("Error getting board!")?;
+    let mut _pins = Pins::new(peripherals.PORT);
+    let _core = CorePeripherals::take().unwrap();
+
+    let mut _rng: Trng = Trng::new(&mut peripherals.MCLK, peripherals.TRNG);
+    let mut _clocks = GenericClockController::with_external_32kosc(
+        peripherals.GCLK,
+        &mut peripherals.MCLK,
+        &mut peripherals.OSC32KCTRL,
+        &mut peripherals.OSCCTRL,
+        &mut peripherals.NVMCTRL,
+    );
+    let mut delay = Delay::new(_core.SYST, &mut _clocks);
 
     // use ChannelMode::NoBlockS
     rtt_init_print!(NoBlockSkip, 4096);
@@ -56,52 +65,45 @@ fn inner_main() -> Result<(), &'static str> {
         rprintln!("Clean boot!");
     }
 
-    let p0 = P0Parts::new(board.P0);
-    let p1 = P1Parts::new(board.P1);
-
-    let kbd_lcd_reset = p1.p1_08; // GPIO5, D5
-    let _stm_cs = p0.p0_07; // GPIO6, D6,
-    let lcd_cs = p0.p0_26; // GPIO9, D9,
-    let lcd_dc = p0.p0_27; // GPIO10, D10
-
-    let kbd_sda = p0.p0_12.into_floating_input().degrade();
-    let kbd_scl = p0.p0_11.into_floating_input().degrade();
-
-    let kbd_i2c = Twim::new(
-        board.TWIM0,
-        TwimPins {
-            sda: kbd_sda,
-            scl: kbd_scl,
-        },
-        TwimFrequency::K100,
+    let kbd_lcd_reset = _pins.d5;
+    let _stm_cs = _pins.d6;
+    let lcd_cs = _pins.d9;
+    let lcd_dc = _pins.d10;
+
+    // i2c keyboard interface
+    // kbd SDA = D12
+    // kbd SCL = D11
+    // FREQ 100KHZ
+    let kbd_i2c = i2c_master(
+        &mut _clocks,
+        100u32.khz(),
+        peripherals.SERCOM2,
+        &mut peripherals.MCLK,
+        _pins.sda,
+        _pins.scl,
+        &mut _pins.port
     );
 
     let mut kbd = Bbq10Kbd::new(kbd_i2c);
 
-    // Pull the neopixel lines low so noise doesn't make it turn on spuriously
-    let _keywing_neopixel = p0.p0_06.into_push_pull_output(Level::Low); // GPIO11, D11
-    let _feather_neopixel = p0.p0_16.into_push_pull_output(Level::Low);
-
-    let spim = Spim::new(
-        board.SPIM3,
-        SpimPins {
-            sck: p0.p0_14.into_push_pull_output(Level::Low).degrade(),
-            miso: Some(p0.p0_15.into_floating_input().degrade()),
-            mosi: Some(p0.p0_13.into_push_pull_output(Level::Low).degrade()),
-        },
-        SpimFrequency::M32,
-        MODE_0,
-        0x00,
+    let lcd_spi = spi_master(
+        &mut _clocks,
+        32u32.mhz(),
+        peripherals.SERCOM1,
+        &mut peripherals.MCLK,
+        _pins.sck,
+        _pins.mosi,
+        _pins.miso,
+        &mut _pins.port
     );
 
     let mut lcd = Ili9341::new_spi(
-        spim,
-        lcd_cs.into_push_pull_output(Level::High),
-        lcd_dc.into_push_pull_output(Level::High),
-        kbd_lcd_reset.into_push_pull_output(Level::High),
+        lcd_spi,
+        lcd_cs.into_push_pull_output(&mut _pins.port),
+        lcd_dc.into_push_pull_output(&mut _pins.port),
+        kbd_lcd_reset.into_push_pull_output(&mut _pins.port),
         &mut delay,
-    )
-    .unwrap();
+    ).unwrap();
 
     lcd.set_orientation(Orientation::Landscape).unwrap();
 
@@ -125,7 +127,7 @@ fn inner_main() -> Result<(), &'static str> {
     rprintln!("Vers: {:?}", vers);
 
     kbd.sw_reset().unwrap();
-    timer.delay_ms(10u8);
+    delay.delay_ms(10u8);
 
     let vers = kbd.get_version().unwrap();
 
@@ -215,12 +217,12 @@ fn inner_main() -> Result<(), &'static str> {
             }
             KeyRaw::Invalid => {
                 if let Some(buf) = fbuffy.inner() {
-                    timer.start(1_000_000u32);
+                    // timer.start(1_000_000u32);
                     lcd.draw_raw(0, 0, 319, 239, buf).map_err(|_| "bad buffy")?;
-                    let done = timer.read();
-                    rprintln!("Drew in {}ms.", done / 1000);
+                    // let done = timer.read();
+                    // rprintln!("Drew in {}ms.", done / 1000);
                 } else {
-                    timer.delay_ms(38u8);
+                    delay.delay_ms(38u8);
                 }
             }
             _ => {}
diff --git a/nrf-hal b/nrf-hal
deleted file mode 160000
index f98fe76..0000000
--- a/nrf-hal
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit f98fe76b4b0d43a8a542c0002ce6b2568d9f4070
diff --git a/shell.nix b/shell.nix
index 19b7c15..1c5dc56 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,4 @@
 let
-  rust-version = "1.46.0";
-
   nixpkgs = fetchGit {
     url = "https://github.com/patrickod/nixpkgs.git";
     rev = "8bb6ca5f0a93bb0b9264b50a8c56431c7c7cc591";
@@ -21,8 +19,7 @@ let
 
 in
   pkgs.mkShell {
-    name = "rust-dev";
-    nativeBuildInputs = with pkgs; [
+    buildInputs = with pkgs; [
       (rustChannels.stable.rust.override {
         targets = targets;
         extensions = [