Merge pull request #32 from rustbox/draw_perf

Draw perf

Author: sethp

Cargo.lock

@@ -28,6 +28,7 @@ path  = "src/bin/keypad.rs"
 
 [profile.release]
 opt-level = 2
+lto       = true
 
 [profile.dev]
 debug     = true # Symbols are nice and they don't increase the size on Flash
@@ -40,13 +41,13 @@ critical-section = "1.1.1"
 embedded-graphics = "0.7.1"
 embedded-hal = "0.2"
 esp-alloc = { version = "0.2.0", features = ["oom-handler"] }
-esp-backtrace = { version = "0.6.0", features = [
+esp-backtrace = { version = "0.7.0", features = [
   "esp32c3",
   "panic-handler",
   "exception-handler",
   "print-jtag-serial",
 ] }
-esp-println = { version = "0.4.0", default-features = false, features = [
+esp-println = { version = "0.5.0", default-features = false, features = [
   "esp32c3",
   "jtag_serial",
 ] }
@@ -63,8 +64,11 @@ unroll = "0.1.5"
 
 [dev-dependencies]
 
+[features]
+default  = ["perf_log"]
+perf_log = []
 
 [patch.crates-io]
 # TODO: automate these updates
-esp32c3-hal    = { git = "https://github.com/rustbox/esp-hal", rev = "72aefcc" }
-esp-hal-common = { git = "https://github.com/rustbox/esp-hal", rev = "72aefcc" }
+esp32c3-hal    = { git = "https://github.com/rustbox/esp-hal", rev = "f49dc55" }
+esp-hal-common = { git = "https://github.com/rustbox/esp-hal", rev = "f49dc55" }

Cargo.toml

@@ -13,7 +13,7 @@ This is targeted at the RISC-V architecture esp32-c3 processor from espressif. T
 
 `rustup target add riscv32imc-unknown-none-elf`
 
-3. Using Cargo, install the `espflash` tool which can upload and flash the code across a serial 
+3. Using Cargo, install the `espflash` tool which can upload and flash the code across a serial
 port (through usb) to the esp32 chip:
 
 `cargo install espflash`

README.md

@@ -0,0 +1,67 @@
+# Original
+
+Hash `3ec5c707513c4b6a533ae8099fe242e81975947e`
+===============================================
+
+```
+528 bytes
+169776.02 draw cycles per byte
+558 bytes
+193957.2 draw cycles per byte
+558 bytes
+199648.33 draw cycles per byte
+558 bytes
+204402.34 draw cycles per byte
+630 bytes
+167890.98 draw cycles per byte
+558 bytes
+223444.6 draw cycles per byte
+558 bytes
+219381.02 draw cycles per byte
+558 bytes
+200000.14 draw cycles per byte
+```
+
+* Average bytes: `563`
+* Average cycles: `197312.6`
+
+# Directly set video memory
+
+Hash: `f2627740c2a6f1ed37715a0d487b7f4987971bb9`
+========================================
+
+```
+698 bytes
+144043.72 draw cycles per byte
+698 bytes
+141167.67 draw cycles per byte
+700 bytes
+140613.3 draw cycles per byte
+698 bytes
+150651.81 draw cycles per byte
+698 bytes
+138351.31 draw cycles per byte
+698 bytes
+142081.36 draw cycles per byte
+```
+
+* Average bytes: `698`
+* Average cycles: `142818.195`
+* Improvement: `24%`
+
+# Draw with `fill_contiguous`, buffer drawing characters, text carries dirty state
+
+Hash: `304c52f8662db2f1363da8a9c36d6136a42d6236`
+============================================
+
+```
+1562 bytes
+12544.181 draw cycles per byte
+2512 bytes
+22627.264 draw cycles per byte
+```
+
+* Average bytes: `2037`
+* Average cycles: `17585.7`
+* Improvement: `3.6x`
+