make: Set up release profile and update the readme

Due to limiting the codegen units to 1 the size of the program memory
can be reduced roughly by 10% and the data memory by a bit more than
20%.

README.md

@@ -79,5 +79,6 @@ regulator is 3.3V.
 ### The Rust Firmware
 To flash the firmware, connect the ICSP pins of the board to the
 programmer and inside the `firmware/rust/` directory run `cargo make
-all`. This burns the fuses, writes the default configuration values to
+--profile release all`. This compiles the firmware with the release
+profile, burns the fuses, writes the default configuration values to
 the EEPROM and flashes the firmware.

firmware/rust/Makefile.toml

@@ -6,35 +6,95 @@ HIGH_FUSE = "0xD6"
 LOW_FUSE = "0xE2"
 
 [tasks.size]
+run_task = [
+    { name = "size-development", condition = { profiles = [ "development" ] } },
+    { name = "size-release", condition = { profiles = [ "release" ] } },
+]
+
+[tasks.size-development]
 description = "Print usage of memory segments"
 dependencies = ["build"]
 command = "avr-size"
 args = ["--format=avr", "--mcu=${MCU}", "target/avr-atmega328p/debug/clock-generator.elf"]
 
+[tasks.size-release]
+description = "Print usage of memory segments"
+dependencies = ["build"]
+command = "avr-size"
+args = ["--format=avr", "--mcu=${MCU}", "target/avr-atmega328p/release/clock-generator.elf"]
+
 [tasks.copy_flash]
+run_task = [
+    { name = "copy_flash-development", condition = { profiles = [ "development" ] } },
+    { name = "copy_flash-release", condition = { profiles = [ "release" ] } },
+]
+
+[tasks.copy_flash-development]
 description = "Extract the flash"
 dependencies = ["build"]
 command = "avr-objcopy"
 args = ["-O", "ihex", "-j", ".text", "-j", ".data", "target/avr-atmega328p/debug/clock-generator.elf", "target/avr-atmega328p/debug/clock-generator.hex"]
 
+[tasks.copy_flash-release]
+description = "Extract the flash"
+dependencies = ["build"]
+command = "avr-objcopy"
+args = ["-O", "ihex", "-j", ".text", "-j", ".data", "target/avr-atmega328p/release/clock-generator.elf", "target/avr-atmega328p/release/clock-generator.hex"]
+
 [tasks.flash]
+run_task = [
+    { name = "flash-development", condition = { profiles = [ "development" ] } },
+    { name = "flash-release", condition = { profiles = [ "release" ] } },
+]
+
+[tasks.flash-development]
 description = "Flash the firmware"
 dependencies = ["copy_flash", "size"]
 command = "avrdude"
 args = ["-p", "${MCU}", "-c", "${PROGRAMMER}", "-U", "flash:w:target/avr-atmega328p/debug/clock-generator.hex:a"]
 
+[tasks.flash-release]
+description = "Flash the firmware"
+dependencies = ["copy_flash", "size-release"]
+command = "avrdude"
+args = ["-p", "${MCU}", "-c", "${PROGRAMMER}", "-U", "flash:w:target/avr-atmega328p/release/clock-generator.hex:a"]
+
 [tasks.copy_eeprom]
+run_task = [
+    { name = "copy_eeprom-development", condition = { profiles = [ "development" ] } },
+    { name = "copy_eeprom-release", condition = { profiles = [ "release" ] } },
+]
+
+[tasks.copy_eeprom-development]
 description = "Extract the EEPROM"
 dependencies = ["build"]
 command = "avr-objcopy"
 args = ["--change-section-lma", ".eeprom=0", "-O", "ihex", "-j", ".eeprom", "target/avr-atmega328p/debug/clock-generator.elf", "target/avr-atmega328p/debug/clock-generator.eep"]
 
+[tasks.copy_eeprom-release]
+description = "Extract the EEPROM"
+dependencies = ["build"]
+command = "avr-objcopy"
+args = ["--change-section-lma", ".eeprom=0", "-O", "ihex", "-j", ".eeprom", "target/avr-atmega328p/release/clock-generator.elf", "target/avr-atmega328p/release/clock-generator.eep"]
+
 [tasks.eeprom]
+run_task = [
+    { name = "eeprom-development", condition = { profiles = [ "development" ] } },
+    { name = "eeprom-release", condition = { profiles = [ "release" ] } },
+]
+
+[tasks.eeprom-development]
 description = "Flash the eeprom"
 dependencies = ["copy_eeprom", "size"]
 command = "avrdude"
 args = ["-p", "${MCU}", "-c", "${PROGRAMMER}", "-U", "eeprom:w:target/avr-atmega328p/debug/clock-generator.eep:a"]
 
+[tasks.eeprom-release]
+description = "Flash the eeprom"
+dependencies = ["copy_eeprom", "size"]
+command = "avrdude"
+args = ["-p", "${MCU}", "-c", "${PROGRAMMER}", "-U", "eeprom:w:target/avr-atmega328p/release/clock-generator.eep:a"]
+
 [tasks.fuses]
 description = "Burn the fuses"
 command = "avrdude"