mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-22 23:49:41 +02:00
Kevin Thomas
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/**
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* @file rp2350_reset_handler.c
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* @brief Reset handler implementation for RP2350.
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* @author Kevin Thomas
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* @date 2026
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*
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* Entry point after power-on or system reset. Initializes the
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* stack, XOSC, subsystem resets, UART, TIMER0 tick
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* generator, then branches to main().
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*
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* MIT License
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*
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* Copyright (c) 2026 Kevin Thomas
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "rp2350_reset_handler.h"
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#include "rp2350_stack.h"
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#include "rp2350_xosc.h"
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#include "rp2350_reset.h"
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#include "rp2350_uart.h"
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#include "rp2350_timer.h"
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extern int main(void);
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extern uint32_t __data_lma;
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extern uint32_t __data_start;
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extern uint32_t __data_end;
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extern uint32_t __bss_start;
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extern uint32_t __bss_end;
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static void _data_copy_init(void)
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{
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uint32_t *src = &__data_lma;
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uint32_t *dst = &__data_start;
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while (dst < &__data_end)
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*dst++ = *src++;
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}
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static void _bss_zero_init(void)
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{
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uint32_t *dst = &__bss_start;
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while (dst < &__bss_end)
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*dst++ = 0U;
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}
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void _ram_init(void)
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{
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stack_init();
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_data_copy_init();
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_bss_zero_init();
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}
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void _late_init(void)
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{
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timer_release_reset();
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timer_tick_init();
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}
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void __attribute__((naked, noreturn)) Reset_Handler(void)
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{
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__asm__ volatile (
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"bl _ram_init\n\t"
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"bl xosc_init\n\t"
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"bl xosc_enable_peri_clk\n\t"
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"bl reset_init_subsystem\n\t"
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"bl uart_release_reset\n\t"
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"bl uart_init\n\t"
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"bl _late_init\n\t"
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"b main\n\t"
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);
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}
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