ra8-firmware 0.1.0
Bare-metal firmware for the Renesas RA8 family (RA8D2 / RA8P1)
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main.c File Reference

AGT0 + AGT1 cascade (32-bit virtual counter) demo for EK-RA8D2. More...

#include <stdint.h>
#include "ra8_agt.h"
#include "ra8_agt_regs.h"
#include "ra8_attributes.h"
#include "ra8_board_ek_ra8d2.h"
#include "ra8_boot_entry.h"
#include "ra8_cgc.h"
#include "ra8_err.h"
#include "ra8_isr.h"
#include "ra8_time.h"
Include dependency graph for main.c:

Go to the source code of this file.

Enumerations

enum  agt_cas_const_t : uint32_t {
  k_agt_cas_baud = 115200U ,
  k_agt_cas_poll_ms = 10U ,
  k_agt_cas_reload32 = 0x00017FFFU
}
 Demo tunables. More...
enum  agt_cas_fmt_t : uint32_t {
  k_agt_cas_hex_digits = 8U ,
  k_agt_cas_hex_shift = 4U ,
  k_agt_cas_hex_mask = 0xFU
}
 Hex-digit width + mask for the per-tick banner formatter. More...
enum  agt_cas_chan_t : uint8_t { k_agt_cas_hi_channel = 1U }
 AGT1 = "high half" channel; its TUNDF flags a full cascade tick. More...

Functions

static void internal_panic_halt (void)
 Spin-halt the core if any init step fails.
static void internal_setup_or_halt (void)
 Bring up CGC, SysTick, SCI8 and LED1.
static ra8_err_t internal_arm (void)
 Arm AGT0 + AGT1 as a 32-bit cascade.
static void internal_format_tick (uint32_t tick, uint8_t *digits)
 Render the 32-bit tick counter into an 8-byte ASCII-hex buf.
static ra8_err_t internal_emit_tick (uint32_t tick)
 Emit one cascade-tick banner over SCI8.
void main (void)
 The application entry point Reset_Handler hands control to.

Variables

static const char s_agt_cas_hex_chars [] = "0123456789ABCDEF"
 Hex print map for the tick counter.
static const uint8_t s_agt_cas_msg_head [] = "agt_cas: tick="
 Tick-line prefix and CR/LF tail.
static const uint8_t s_agt_cas_msg_tail [] = "\r\n"

Detailed Description

AGT0 + AGT1 cascade (32-bit virtual counter) demo for EK-RA8D2.

Tag
[Ring 6 / APP] {World: S}

Brings up CGC + SysTick + UART (SCI8 on PD_02 / PD_03) and arms the AGT0 + AGT1 pair as a 32-bit cascade via the new ra8_agt_start_cascade HAL surface. AGT0 in plain timer mode counts PCLKB; its underflow signal feeds AGT1 (TCK[2:0] = 101b per HUM Ch 24.2.5 "AGTMR1" p 1168 note 6). The effective virtual period is (reload32 + 1) PCLKB cycles.

The demo polls AGT1's AGTCR.TUNDF in the foreground loop. Each AGT1 underflow:

  1. Stops + re-arms the cascade to clear AGT1.AGTCR.TUNDF.
  2. Toggles board LED1 so a scope / human can see the cadence.
  3. Emits agt_cas: tick=XXXXXXXX\r\n over SCI8.

The HIL gate scrapes agt_cas: tick= to confirm bring-up.

Copyright
Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT
Since
0.1.0

Definition in file main.c.

Enumeration Type Documentation

◆ agt_cas_chan_t

enum agt_cas_chan_t : uint8_t

AGT1 = "high half" channel; its TUNDF flags a full cascade tick.

Enumerator
k_agt_cas_hi_channel 

AGT cas hi channel.

Definition at line 59 of file main.c.

◆ agt_cas_const_t

enum agt_cas_const_t : uint32_t

Demo tunables.

Enumerator
k_agt_cas_baud 

AGT cas baud.

k_agt_cas_poll_ms 

AGT cas poll ms.

k_agt_cas_reload32 

AGT cas reload32.

Definition at line 42 of file main.c.

◆ agt_cas_fmt_t

enum agt_cas_fmt_t : uint32_t

Hex-digit width + mask for the per-tick banner formatter.

Enumerator
k_agt_cas_hex_digits 

AGT cas hex digits.

k_agt_cas_hex_shift 

AGT cas hex shift.

k_agt_cas_hex_mask 

AGT cas hex mask.

Definition at line 52 of file main.c.

Function Documentation

◆ internal_arm()

ra8_err_t internal_arm ( void )
staticnodiscard

Arm AGT0 + AGT1 as a 32-bit cascade.

MC/DC:
Single atomic decision: ra8_agt_start_cascade != ok. Two vectors – happy path (HIL bench) and the bad-clock reject path covered in tests/misc/src/test_ra8_agt.c.
Returns
ra8_err_t from the HAL call.
Precondition
CGC + SCI8 + LED bring-up has finished.
IRQs are masked or the demo is single-threaded.
Postcondition
AGT0 and AGT1 are both running, AGT0 underflow -> AGT1 count source per HUM Ch 24.2.5 p 1168 note 6.
AGT1 AGTCR.TSTART reads 1.
Note
Not thread-safe.
Since
0.1.0

Definition at line 150 of file main.c.

References k_agt_cas_reload32, k_ra8_agt_cascade_clk_pclkb, ra8_agt_start_cascade(), and RA8_INTERNAL.

◆ internal_emit_tick()

ra8_err_t internal_emit_tick ( uint32_t tick)
staticnodiscard

Emit one cascade-tick banner over SCI8.

Format: agt_cas: tick=XXXXXXXX\r\n. The HIL probe matches on the agt_cas: tick= prefix so any non-zero tick passes.

Parameters
[in]tickCurrent tick counter value.
Returns
ra8_err_t from the SCI driver (first failure wins).
Precondition
SCI8 has been initialised.
tick fits in 32 bits.
Postcondition
Up to 24 bytes have been pushed into the SCI8 TX path.
No mutable global is touched.
Note
Not thread-safe.
Since
0.1.0

Definition at line 210 of file main.c.

References internal_format_tick(), k_agt_cas_hex_digits, k_ra8_ok, ra8_board_uart_console_write(), RA8_INTERNAL, s_agt_cas_msg_head, and s_agt_cas_msg_tail.

Referenced by main().

◆ internal_format_tick()

void internal_format_tick ( uint32_t tick,
uint8_t * digits )
static

Render the 32-bit tick counter into an 8-byte ASCII-hex buf.

Big-endian hex render: digits[0] = most-significant nibble. Caller passes a buffer >= 8 bytes long.

Parameters
[in]tickTick counter value to render.
[out]digitsDestination buffer (>= 8 bytes).
Precondition
digits is non-NULL and >= 8 bytes.
The caller will not interpret digits as NUL-terminated.
Postcondition
digits contains the 8 ASCII hex digits of tick.
No global state is touched.
Note
Not thread-safe (caller owns the buffer).
Since
0.1.0

Definition at line 180 of file main.c.

References k_agt_cas_hex_digits, k_agt_cas_hex_mask, k_agt_cas_hex_shift, RA8_INTERNAL, and s_agt_cas_hex_chars.

Referenced by internal_emit_tick().

◆ internal_panic_halt()

void internal_panic_halt ( void )
static

Spin-halt the core if any init step fails.

Boot helper. Uses wfi so an attached debugger can break in and inspect the failed init.

Precondition
Called only from main() / the boot path.
No caller relies on the function returning.
Postcondition
Core is halted in a tight wfi loop.
No registers other than pc change after the first wfi.
Note
Not thread-safe (boot path).
Since
0.1.0

Definition at line 86 of file main.c.

References RA8_INTERNAL.

◆ internal_setup_or_halt()

void internal_setup_or_halt ( void )
static

Bring up CGC, SysTick, SCI8 and LED1.

Sequence: ra8_cgc_init -> ra8_time_init -> ra8_board_uart_console_init -> ra8_board_led_init. Any failure goes straight to panic-halt so the HIL gate sees no agt_cas: banner.

Precondition
Called once from main() before ra8_isr_globals_enable.
Stack is sized for the SCI bring-up call chain.
Postcondition
All peripherals named above are powered, configured, and ready.
No mutable global beyond CGC / SCI driver state is touched.
Note
Not thread-safe (boot path).
Since
0.1.0

Definition at line 110 of file main.c.

References internal_panic_halt(), k_agt_cas_baud, k_ra8_board_led1, k_ra8_clock_id_cpuclk0, k_ra8_ok, ra8_board_led_init(), ra8_board_uart_console_init(), ra8_cgc_get_clock_hz(), ra8_cgc_init(), RA8_INTERNAL, and ra8_time_init().

◆ main()

void main ( void )

The application entry point Reset_Handler hands control to.

Returns void, not int. This is a freestanding image: there is no hosted C environment, no process and nothing to report an exit status to. ISO C fixes main at int only for a hosted implementation; for a freestanding one (C23 5.1.2.1) the startup function's name and type are implementation-defined, and this is that definition. Reset_Handler discards no value because there is none to discard, and if main ever does return, startup halts the CPU rather than resuming anything.

The firmware lane is compiled -ffreestanding (see cmake/ra8_add_app.cmake) and the flag and this signature travel together: without it both GCC and clang reject a non-int main (-Wmain / -Wmain-return-type). Do not remove one without the other.

That coupling is why the declaration sits behind __STDC_HOSTED__ == 0, which -ffreestanding sets and a hosted build does not. The guard is not defensive dressing: this header is reachable from host builds (the unit tests compile ra8_core natively), and an unguarded void main(void); makes every hosted translation unit that includes it fail with conflicting types for 'main' against its own ISO int main. The declaration therefore exists exactly where its contract does.

Hosted first-party code – everything under tests/ and tools/ – uses the ISO int main(...) contract instead, because it genuinely does run under an OS that reads the exit status. scripts/checks/check_entry_points.py holds each domain to its own contract (#707).

Declared here, once, for the same reason SystemInit is: every vector_table.c used to restate it as a local extern int32_t main(void);, sixteen copies that no compiler ever compared against the definition – and roughly thirty of them had silently drifted out of agreement with the main they called.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has configured the clock tree and VTOR.
Postcondition
Control does not return; the image runs until reset or halt.
Any value the application wanted to report has been logged, not returned.
Note
Not thread-safe; single-threaded startup context only.
Warning
Only valid while the translation unit is compiled -ffreestanding. A hosted build rejects this signature.
See also
SystemInit()
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up CGC + BSP audio then plays blocks.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the CPU stays in the playback loop forever.
On any HAL init failure the function halts in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up CGC + GPT triple, runs sweep.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the CPU stays in the sweep loop forever.
On any HAL init failure the function halts in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up clocks + UART + RMII pins, then ThreadX.

Precondition
Reset_Handler has copied .data and zeroed .bss.
Postcondition
On clean entry the kernel runs the worker thread once.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up clocks + UART, then enters ThreadX.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the kernel runs the worker thread forever.
On any HAL init failure the function halts in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up LED, console, SDHI pins, then ThreadX.

Precondition
Reset_Handler has copied .data + zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
CPUCLK0 is raised to the PLL1 target before the kernel starts.
On clean entry the SD card thread runs forever.
On any HAL init failure the function halts in __WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up CGC + USB-FS + UAC1, then enters the iso-IN feed loop forever.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the CPU stays in the iso-IN feed loop forever.
On any HAL init failure the function halts in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
SystemInit set VTOR / FPU / priority grouping.

The application entry point Reset_Handler hands control to.

See file header.

Precondition
Boot init has completed.
The secure-boot library's BLXNS into NS image either failed or was skipped (the call site in ra8_trustzone_init is a no-op on host builds).
Postcondition
Diagnostic counter latched, CPU parked in a halt loop.
Function never returns.
Note
Single-threaded entry.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
On success g_eoh_chapters / g_eoh_crc hold the parsed results, the banner is emitted, and g_eoh_heartbeat advances once per frame.
On any failure g_eoh_err is non-zero and the CPU parks (no heartbeat).
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The chapters/ch0-CRC banner is emitted; the CPU then loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
On success the g_etoc_* result globals hold the parsed TOC values, the banner is emitted, and g_etoc_heartbeat advances once per frame.
On any failure g_etoc_err is non-zero and the CPU parks (no heartbeat).
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss; SystemInit set VTOR/FPU.
Postcondition
The shelf scans on the panel; taps open books, browse, and read.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The slab/arena/tile/vmem banner is emitted; the CPU then loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
On success the cache globals are latched and g_pc_heartbeat advances.
On any failure g_pc_err is non-zero and the CPU parks (no heartbeat).
Since
0.1.0

The application entry point Reset_Handler hands control to.

Profiles power modes once a second.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the CPU stays in the profile + blink loop.
On any HAL hard error LED2 latches ON.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
The shared board boot files installed the vector table.
Postcondition
The demo has run once and its verdict banner is streaming steadily.
The CPU idles re-emitting the banner (or halts after a fatal init error).
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up the clocks, console, SPI, and SD card, then runs the shared ra8_io VFS round-trip over the SD-over-SPI block device. On success it prints the exact PASS banner the HIL runner and ra8_emulator smoke gate scrape for; on any failure it prints FAIL and parks the core.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On a clean run the CPU loops forever after the PASS banner.
On any failure the function prints FAIL and halts in WFI.
Note
Not thread-safe; this is the single-threaded app entry.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Initialises logging and the console, brings up the OSPI NOR volume, runs the erase-before-write round-trip, and prints a single PASS/FAIL verdict line over SCI8 before parking in an infinite loop.

Precondition
SystemInit configured VTOR / FPU / priority grouping.
The OSPI NOR array is present (modelled in ra8_emulator, real on silicon).
Postcondition
Exactly one PASS or FAIL verdict line has been queued on SCI8.
Control parks in an infinite loop; the function never returns.
Note
Single-threaded; runs to the park loop on the main stack.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The page-count + render-hash banner is emitted; the CPU loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The cal=OK / cal=SKIP result and the finger-free touchcal: ready sentinel are emitted; the CPU then loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The open=OK touch banner is emitted; the CPU then loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Both USB controllers' clocks and pins come up before the kernel so the workers only deal with stack bring-up.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR, FPU, priority grouping.
Postcondition
On clean entry the CPU stays in tx_kernel_enter forever.
On any HAL init failure the function halts in WFI.
Note
Single entry point; not re-entrant.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up logging and the clock tree, releases the Cortex-M33 (which then blinks LED1 via ra8_pcntr_set_output()), and idles. See the file header.

Precondition
SystemInit has completed core bring-up.
The M33 is held in reset by hardware until released here.
Postcondition
The M33 has been released and is blinking LED1.
This function never returns to its caller.
Note
Single-threaded; no RTOS on the M85 in this template.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
The application links ra8_c6link and ESP-hosted generated codecs.
No hardware validation is inferred from this function.
Postcondition
No c6link operation is attempted.
No network or storage state is modified.
Note
Single-threaded compile fixture.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up logging, the clock tree, and the VCOM console, runs the cacheable-SRAM round-trip with the D-cache that SystemInit() enabled through ra8_cache_dcache_enable(), emits the matching PASS / FAIL banner over the console and ra8_log, then parks in WFI. Every byte the self-test touches runs with the L1 caches + MPU enabled by the shared boot (RA8_BOOT_ENABLE_CACHE_MPU + RA8_BOOT_CACHE_VIA_HAL).

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit enabled the MPU + I-cache + D-cache via the ra8_cache HAL.
Postcondition
Exactly one banner (PASS or FAIL) has been emitted.
The core is parked in WFI.
Note
Single-threaded; no RTOS and no IRQ sources in this template.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Publishes the mailbox, releases the Cortex-M33 into the emitter, yields until it signals done, validates the blob the M33 built, then logs the PASS/FAIL verdict and the chapter count read back from the blob. See the file header for the offload narrative.

Precondition
SystemInit has completed core bring-up.
The M33 is held inactive by hardware until released here.
Postcondition
The M33 has built a RABOOK1 blob and the M85 has validated it.
This function never returns to its caller.
Note
Single-threaded; no RTOS on the M85 in this example.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
On success the CPU heartbeats after epaper: PASS.
On any HAL error the console prints epaper: FAIL and the red LED latches on.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The chapters/toc/cover banner is emitted; CPU loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The reader loop runs forever, redrawing on each tap.
A page-1 banner is emitted once after the first render.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The cover-size / framebuffer-CRC banner is emitted; CPU loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The panel shows the reader screen and the input loop runs forever.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Publishes the mailbox, arms the IPC0 wake and configures the LPM block, releases the Cortex-M33 into the reader, waits for the first held page, logs the page-0 verdict, then runs the #150 mode-switch cycle – parking in low-power WFI and waking on the M33's page-turn pokes – before logging the handoff verdict and parking for good. See the file header for the narrative.

Precondition
SystemInit has completed core bring-up.
The M33 is held inactive by hardware until released here.
Postcondition
The M33 has rendered + re-rendered the held page and the M85 is parked.
This function never returns to its caller.
Note
Single-threaded; no RTOS on the M85 in this example.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The boot banner is emitted; the reader loop services taps forever.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up the timebase then measures forever.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the CPU stays in the measure + blink loop forever.
On any HAL init failure the function halts in WFI.
Note
Never returns.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Arms the RIIC1 target and polls the dispatcher.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
The CPU stays in the dispatch poll loop forever.
On any fatal init error the CPU parks in riic_target_panic_halt.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On a clean run the PASS banner is printed and the CPU loops in WFI.
On any failure the function prints a FAIL line and halts.
Note
Not thread-safe; single-threaded app entry.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the CPU stays in the read + print loop forever.
On any HAL hard error LED2 latches ON and the loop exits.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up the LIN commander then drives frames.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On clean entry the CPU stays in the LIN-frame + blink loop forever.
On any HAL init failure the function halts in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up logging, "renders" page 0 into the shared mailbox, releases the Cortex-M33 into its hold loop, and parks the M85 in low-power WFI sleep. See the file header for the power-saving narrative.

Precondition
SystemInit has completed core bring-up.
The M33 is held inactive by hardware until released here.
Postcondition
The M33 owns the held page and the M85 is parked.
This function never returns to its caller.
Note
Single-threaded; no RTOS on the M85 in this example.
Since
0.1.0

The application entry point Reset_Handler hands control to.

The USB clock, pins, console, and the SD card all come up before the kernel so the worker only deals with USB stack bring-up.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR, FPU, priority grouping.
Postcondition
On clean entry the CPU stays in tx_kernel_enter forever.
On any HAL init failure the function halts in WFI.
Note
Single entry point; not re-entrant.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit configured VTOR / FPU.
Postcondition
On clean bring-up the CPU stays in the poll loop.
On any HAL init failure the function halts in WFI.
Note
Single entry point; not re-entrant.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler initialized static storage.
SystemInit configured VTOR, FPU, and priority grouping.
Postcondition
The startup banner is printed once.
Control enters ThreadX and never returns normally.
Note
The #707 freestanding contract is declared by ra8_boot_entry.h.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On a clean run the PASS banner is printed and the CPU heartbeats forever.
On any failure LED2 latches ON and the CPU parks.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up logging, the clock tree, and the VCOM console, runs the three-step self-test (MPU enabled, canonical boot map, Device MMIO), emits the matching PASS / FAIL banner over the console and ra8_log, then parks in WFI.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit installed the boot map via ra8_mpu_apply_boot_map().
Postcondition
Exactly one banner (PASS or a step-specific FAIL) has been emitted.
The core is parked in WFI.
Note
Single-threaded; no RTOS and no IRQ sources in this template.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler initialised the C runtime; SystemInit ran.
The EK-RA8D2 J-Link OB VCOM console is attached for the banner.
Postcondition
The commit + rollback attempts have executed against extra-MRAM.
The verdict banner is emitted once per report cycle.
Note
Single entry point; not re-entrant.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Initialises logging + console, brings up the MRAM volume, runs the wear-levelling + power-cycle-survival flow, and prints a single PASS/FAIL verdict.

Precondition
SystemInit configured VTOR / FPU / priority grouping.
The extra-MRAM region is present (modelled in ra8_emulator, real on silicon).
Postcondition
Exactly one PASS or FAIL verdict line has been queued on SCI8.
Control parks in an infinite loop; the function never returns.
Note
Single-threaded; runs to the park loop on the main stack.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Initialises logging + console, brings up the MRAM volume, runs the program/erase round-trip, and prints a single PASS/FAIL verdict.

Precondition
SystemInit configured VTOR / FPU / priority grouping.
The extra-MRAM region is present (modelled in ra8_emulator, real on silicon).
Postcondition
Exactly one PASS or FAIL verdict line has been queued on SCI8.
Control parks in an infinite loop; the function never returns.
Note
Single-threaded; runs to the park loop on the main stack.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up the clocks, console, and SDHI bus pins, runs the native SD card identification, fills the payload, then runs the full ra8_io VFS round-trip over the native-SDHI block device. On success it prints the exact PASS banner the HIL runner and ra8_emulator smoke gate scrape for; on any failure it prints FAIL and parks the core.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On a clean run the CPU loops forever after the PASS banner.
On any failure the function prints FAIL and halts in WFI.
Note
Not thread-safe; this is the single-threaded app entry.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up the console and both stdio sinks, retargets the engine's stdio to the in-RAM capture sink, runs the two-backend swap, replays the RAM capture out of the UART, and prints a single PASS/FAIL verdict per abstraction before parking in an infinite loop.

Precondition
SystemInit configured VTOR / FPU / priority grouping.
The OSPI NOR array is present (modelled in ra8_emulator, real on silicon).
Postcondition
A PASS or FAIL verdict line has been queued on SCI8 for each abstraction.
Control parks in an infinite loop; the function never returns.
Note
Single-threaded; runs to the park loop on the main stack.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up the clocks, console, and SDHI bus pins, runs the native SD card identification, fills the payload, then writes + reads + compares one raw 512-byte block straight against ra8_sdcard. On success it prints the exact PASS banner; on any failure it prints FAIL and parks the core.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, FPU, and priority grouping.
Postcondition
On a clean run the CPU loops forever after the PASS banner.
On any failure the function prints FAIL and halts in WFI.
Note
Not thread-safe; this is the single-threaded app entry.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler copied .data and zeroed .bss.
SystemInit set VTOR / FPU / priority grouping.
Postcondition
The whoami PASS banner is emitted; the CPU then loops in WFI.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Brings up clocks + UART + RMII + RSIP, then ThreadX.

Precondition
Reset_Handler has copied .data and zeroed .bss.
Postcondition
On clean entry the kernel runs the worker thread once.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, the FPU and the priority grouping.
Postcondition
The banner was printed exactly once.
Control passed to ThreadX and never came back.
Note
Everything after tx_kernel_enter happens on ThreadX; the panic-halt below is reached only if the kernel refuses to start.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, the FPU and the priority grouping.
Postcondition
The banner and the resolved pin map were printed exactly once.
Control passed to ThreadX and never came back.
Note
Everything after tx_kernel_enter happens on ThreadX; the panic-halt below is reached only if the kernel refuses to start.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, the FPU and priority grouping.
Postcondition
The probe ran exactly once and printed its verdict.
The CPU stays in a slow heartbeat loop afterwards.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Precondition
Reset_Handler has copied .data and zeroed .bss.
SystemInit has set VTOR, the FPU and the priority grouping.
Postcondition
The banner was printed exactly once.
Control passed to ThreadX and never came back.
Note
Everything after tx_kernel_enter runs on ThreadX; the panic-halt below is reached only if the kernel refuses to start.
Since
0.1.0

The application entry point Reset_Handler hands control to.

Initializes and arms ADC_B, formats each successful channel sample without variadic I/O, emits the verdict, toggles LED1, and delays.

Precondition
Reset startup and SystemInit completed successfully.
The selected ADC channel matches the board analog connection.
Postcondition
Every PASS verdict follows a successful channel read.
Any read or LED failure leads to the terminal panic helper.
Note
Does not return during normal operation.
Since
0.1.0

Definition at line 227 of file main.c.

References internal_arm(), internal_emit_tick(), internal_panic_halt(), internal_setup_or_halt(), k_agt_cas_hi_channel, k_agt_cas_poll_ms, k_ra8_agt_agtcr_tundf_msk, k_ra8_board_led1, k_ra8_ok, ra8_agt_get_status(), ra8_agt_stop(), ra8_board_led_toggle(), ra8_delay_ms(), and ra8_isr_globals_enable().

Variable Documentation

◆ s_agt_cas_hex_chars

const char s_agt_cas_hex_chars[] = "0123456789ABCDEF"
static

Hex print map for the tick counter.

Definition at line 64 of file main.c.

Referenced by internal_format_tick().

◆ s_agt_cas_msg_head

const uint8_t s_agt_cas_msg_head[] = "agt_cas: tick="
static

Tick-line prefix and CR/LF tail.

Definition at line 67 of file main.c.

Referenced by internal_emit_tick().

◆ s_agt_cas_msg_tail

const uint8_t s_agt_cas_msg_tail[] = "\r\n"
static

Definition at line 68 of file main.c.

Referenced by internal_emit_tick().