feat: add display UI with splash screen, dashboard, and RSSI sparkline

Implement full SSD1306 OLED display support:
- Splash screen on boot (1.5s) with project name, version, board
- Dashboard showing radio state, config, counters, RSSI/SNR
- RSSI history sparkline (64-sample ring buffer, 2px-wide bars)
- DisplayOn/DisplayOff host commands routed via dedicated channel
- Pure render functions against generic DrawTarget (no hardware coupling)
- Display on/off control bypasses radio task entirely

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/nrf51-pac/src/timer0.rs

@@ -0,0 +1,106 @@
+#[doc = r"Register block"]
+#[repr(C)]
+pub struct RegisterBlock {
+    #[doc = "0x00 - Start Timer."]
+    pub tasks_start: TASKS_START,
+    #[doc = "0x04 - Stop Timer."]
+    pub tasks_stop: TASKS_STOP,
+    #[doc = "0x08 - Increment Timer (In counter mode)."]
+    pub tasks_count: TASKS_COUNT,
+    #[doc = "0x0c - Clear timer."]
+    pub tasks_clear: TASKS_CLEAR,
+    #[doc = "0x10 - Shutdown timer."]
+    pub tasks_shutdown: TASKS_SHUTDOWN,
+    _reserved5: [u8; 0x2c],
+    #[doc = "0x40..0x50 - Capture Timer value to CC\\[n\\]
+registers."]
+    pub tasks_capture: [TASKS_CAPTURE; 4],
+    _reserved6: [u8; 0xf0],
+    #[doc = "0x140..0x150 - Compare event on CC\\[n\\]
+match."]
+    pub events_compare: [EVENTS_COMPARE; 4],
+    _reserved7: [u8; 0xb0],
+    #[doc = "0x200 - Shortcuts for Timer."]
+    pub shorts: SHORTS,
+    _reserved8: [u8; 0x0100],
+    #[doc = "0x304 - Interrupt enable set register."]
+    pub intenset: INTENSET,
+    #[doc = "0x308 - Interrupt enable clear register."]
+    pub intenclr: INTENCLR,
+    _reserved10: [u8; 0x01f8],
+    #[doc = "0x504 - Timer Mode selection."]
+    pub mode: MODE,
+    #[doc = "0x508 - Sets timer behaviour."]
+    pub bitmode: BITMODE,
+    _reserved12: [u8; 0x04],
+    #[doc = "0x510 - 4-bit prescaler to source clock frequency (max value 9). Source clock frequency is divided by 2^SCALE."]
+    pub prescaler: PRESCALER,
+    _reserved13: [u8; 0x2c],
+    #[doc = "0x540..0x550 - Capture/compare registers."]
+    pub cc: [CC; 4],
+    _reserved14: [u8; 0x0aac],
+    #[doc = "0xffc - Peripheral power control."]
+    pub power: POWER,
+}
+#[doc = "TASKS_START (w) register accessor: an alias for `Reg<TASKS_START_SPEC>`"]
+pub type TASKS_START = crate::Reg<tasks_start::TASKS_START_SPEC>;
+#[doc = "Start Timer."]
+pub mod tasks_start;
+#[doc = "TASKS_STOP (w) register accessor: an alias for `Reg<TASKS_STOP_SPEC>`"]
+pub type TASKS_STOP = crate::Reg<tasks_stop::TASKS_STOP_SPEC>;
+#[doc = "Stop Timer."]
+pub mod tasks_stop;
+#[doc = "TASKS_COUNT (w) register accessor: an alias for `Reg<TASKS_COUNT_SPEC>`"]
+pub type TASKS_COUNT = crate::Reg<tasks_count::TASKS_COUNT_SPEC>;
+#[doc = "Increment Timer (In counter mode)."]
+pub mod tasks_count;
+#[doc = "TASKS_CLEAR (w) register accessor: an alias for `Reg<TASKS_CLEAR_SPEC>`"]
+pub type TASKS_CLEAR = crate::Reg<tasks_clear::TASKS_CLEAR_SPEC>;
+#[doc = "Clear timer."]
+pub mod tasks_clear;
+#[doc = "TASKS_SHUTDOWN (w) register accessor: an alias for `Reg<TASKS_SHUTDOWN_SPEC>`"]
+pub type TASKS_SHUTDOWN = crate::Reg<tasks_shutdown::TASKS_SHUTDOWN_SPEC>;
+#[doc = "Shutdown timer."]
+pub mod tasks_shutdown;
+#[doc = "TASKS_CAPTURE (w) register accessor: an alias for `Reg<TASKS_CAPTURE_SPEC>`"]
+pub type TASKS_CAPTURE = crate::Reg<tasks_capture::TASKS_CAPTURE_SPEC>;
+#[doc = "Capture Timer value to CC\\[n\\]
+registers."]
+pub mod tasks_capture;
+#[doc = "EVENTS_COMPARE (rw) register accessor: an alias for `Reg<EVENTS_COMPARE_SPEC>`"]
+pub type EVENTS_COMPARE = crate::Reg<events_compare::EVENTS_COMPARE_SPEC>;
+#[doc = "Compare event on CC\\[n\\]
+match."]
+pub mod events_compare;
+#[doc = "SHORTS (rw) register accessor: an alias for `Reg<SHORTS_SPEC>`"]
+pub type SHORTS = crate::Reg<shorts::SHORTS_SPEC>;
+#[doc = "Shortcuts for Timer."]
+pub mod shorts;
+#[doc = "INTENSET (rw) register accessor: an alias for `Reg<INTENSET_SPEC>`"]
+pub type INTENSET = crate::Reg<intenset::INTENSET_SPEC>;
+#[doc = "Interrupt enable set register."]
+pub mod intenset;
+#[doc = "INTENCLR (rw) register accessor: an alias for `Reg<INTENCLR_SPEC>`"]
+pub type INTENCLR = crate::Reg<intenclr::INTENCLR_SPEC>;
+#[doc = "Interrupt enable clear register."]
+pub mod intenclr;
+#[doc = "MODE (rw) register accessor: an alias for `Reg<MODE_SPEC>`"]
+pub type MODE = crate::Reg<mode::MODE_SPEC>;
+#[doc = "Timer Mode selection."]
+pub mod mode;
+#[doc = "BITMODE (rw) register accessor: an alias for `Reg<BITMODE_SPEC>`"]
+pub type BITMODE = crate::Reg<bitmode::BITMODE_SPEC>;
+#[doc = "Sets timer behaviour."]
+pub mod bitmode;
+#[doc = "PRESCALER (rw) register accessor: an alias for `Reg<PRESCALER_SPEC>`"]
+pub type PRESCALER = crate::Reg<prescaler::PRESCALER_SPEC>;
+#[doc = "4-bit prescaler to source clock frequency (max value 9). Source clock frequency is divided by 2^SCALE."]
+pub mod prescaler;
+#[doc = "CC (rw) register accessor: an alias for `Reg<CC_SPEC>`"]
+pub type CC = crate::Reg<cc::CC_SPEC>;
+#[doc = "Capture/compare registers."]
+pub mod cc;
+#[doc = "POWER (rw) register accessor: an alias for `Reg<POWER_SPEC>`"]
+pub type POWER = crate::Reg<power::POWER_SPEC>;
+#[doc = "Peripheral power control."]
+pub mod power;