Merge pull request #6 from TitanMKD/master
Added ROM to RAM code copy & exec
This commit is contained in:
commit
da27adcf1c
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Linker script for HackRF Jellybean (LPC4330, 1M SPI flash, 264K SRAM). */
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/* Define memory regions. */
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MEMORY
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{
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/* Physical address in Flash used to copy Code from Flash to RAM */
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rom_flash (rx) : ORIGIN = 0x80000000, LENGTH = 1M
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/* rom is really the shadow region that points to SPI flash or elsewhere */
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rom (rx) : ORIGIN = 0x00000000, LENGTH = 1M
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ram (rwx) : ORIGIN = 0x10000000, LENGTH = 128K
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/* there are some additional RAM regions */
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}
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/* Include the common ld script. */
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INCLUDE libopencm3_lpc43xx_rom_to_ram.ld
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = miniblink
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LDSCRIPT = ../jellybean-lpc4330_rom_to_ram.ld
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include ../../Makefile.include
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This is the smallest-possible example program using libopencm3.
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It's intended for the Jellybean development board from the HackRF project:
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https://github.com/mossmann/hackrf
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It should blink LED1 on the board.
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This example copy the Code from ROM to RAM and execute code from RAM.
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/lpc43xx/gpio.h>
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#include <libopencm3/lpc43xx/scu.h>
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#include "../jellybean_conf.h"
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void gpio_setup(void)
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{
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/* Configure SCU Pin Mux as GPIO */
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scu_pinmux(SCU_PINMUX_LED1, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_LED2, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_LED3, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_EN1V8, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT0, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT1, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT2, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT3, SCU_GPIO_FAST);
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/* Configure all GPIO as Input (safe state) */
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GPIO0_DIR = 0;
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GPIO1_DIR = 0;
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GPIO2_DIR = 0;
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GPIO3_DIR = 0;
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GPIO4_DIR = 0;
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GPIO5_DIR = 0;
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GPIO6_DIR = 0;
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GPIO7_DIR = 0;
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/* Configure GPIO as Output */
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GPIO2_DIR |= (PIN_LED1|PIN_LED2|PIN_LED3); /* Configure GPIO2[1/2/8] (P4_1/2 P6_12) as output. */
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GPIO3_DIR |= PIN_EN1V8; /* GPIO3[6] on P6_10 as output. */
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}
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u32 boot0, boot1, boot2, boot3;
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int main(void)
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{
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int i;
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gpio_setup();
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/* Set 1V8 */
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gpio_set(PORT_EN1V8, PIN_EN1V8);
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/* Blink LED1/2/3 on the board and Read BOOT0/1/2/3 pins. */
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while (1)
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{
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boot0 = BOOT0_STATE;
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boot1 = BOOT1_STATE;
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boot2 = BOOT2_STATE;
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boot3 = BOOT3_STATE;
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gpio_set(PORT_LED1_3, (PIN_LED1|PIN_LED2|PIN_LED3)); /* LEDs on */
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for (i = 0; i < 2000000; i++) /* Wait a bit. */
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__asm__("nop");
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gpio_clear(PORT_LED1_3, (PIN_LED1|PIN_LED2|PIN_LED3)); /* LED off */
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for (i = 0; i < 2000000; i++) /* Wait a bit. */
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__asm__("nop");
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}
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return 0;
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}
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@ -3,6 +3,7 @@
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
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* Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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@ -35,6 +36,7 @@ SECTIONS
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.text : {
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. = ALIGN(0x400);
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_text_ram = 0; /* Start of Code in RAM NULL because Copy of Code from ROM to RAM disabled */
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*(.vectors) /* Vector table */
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*(.text*) /* Program code */
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. = ALIGN(4);
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@ -50,6 +52,8 @@ SECTIONS
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__exidx_end = .;
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_etext = .;
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_etext_ram = 0; /* Start of Code in RAM NULL because Copy of Code from ROM to RAM disabled */
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_etext_rom = 0; /* Start of Code in RAM NULL because Copy of Code from ROM to RAM disabled */
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. = ORIGIN(ram);
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
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* Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Generic linker script for LPC43XX targets using libopencm3. */
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/* Memory regions must be defined in the ld script which includes this one. */
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/* Enforce emmition of the vector table. */
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EXTERN (vector_table)
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/* Define the entry point of the output file. */
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ENTRY(reset_handler)
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/* Define sections. */
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SECTIONS
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{
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. = ORIGIN(rom);
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.text : {
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. = ALIGN(0x400);
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_text_ram = . + ORIGIN(ram); /* Start of Code in RAM */
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*(.vectors) /* Vector table */
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*(.text*) /* Program code */
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. = ALIGN(4);
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*(.rodata*) /* Read-only data */
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. = ALIGN(4);
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} >rom
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/* exception index - required due to libgcc.a issuing /0 exceptions */
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__exidx_start = .;
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.ARM.exidx : {
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*(.ARM.exidx*)
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} > rom
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__exidx_end = .;
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_etext = .;
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_etext_ram = . + ORIGIN(ram);
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_etext_rom = . + ORIGIN(rom_flash);
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. = ORIGIN(ram);
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.data : {
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_data = .;
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*(.data*) /* Read-write initialized data */
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. = ALIGN(4);
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_edata = .;
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} >ram AT >rom
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.bss : {
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*(.bss*) /* Read-write zero initialized data */
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*(COMMON)
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. = ALIGN(4);
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_ebss = .;
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} >ram
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/* exception unwind data - required due to libgcc.a issuing /0 exceptions */
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.ARM.extab : {
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*(.ARM.extab*)
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} >ram
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/*
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* The .eh_frame section appears to be used for C++ exception handling.
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* You may need to fix this if you're using C++.
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*/
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/DISCARD/ : { *(.eh_frame) }
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/*
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* Another section used by C++ stuff, appears when using newlib with
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* 64bit (long long) printf support - discard it for now.
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*/
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/DISCARD/ : { *(.ARM.exidx) }
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end = .;
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/* Leave room above stack for IAP to run. */
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__StackTop = ORIGIN(ram) + LENGTH(ram) - 32;
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PROVIDE(_stack = __StackTop);
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}
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@ -22,6 +22,7 @@
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/* Symbols exported by the linker script(s). */
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extern unsigned _etext, _data, _edata, _ebss, _stack;
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extern unsigned _etext_ram, _text_ram, _etext_rom;
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void main(void);
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void reset_handler(void);
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qei_irqhandler,
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};
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#define MMIO32(addr) (*(volatile unsigned long*)(addr))
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#define CREG_M4MEMMAP MMIO32( (0x40043000 + 0x100) )
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void reset_handler(void)
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{
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volatile unsigned *src, *dest;
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__asm__("MSR msp, %0" : : "r"(&_stack));
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/* Copy the code from ROM to Real RAM (if enabled) */
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if( (&_etext_ram-&_text_ram) > 0 )
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{
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src = &_etext_rom-(&_etext_ram-&_text_ram);
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for(dest = &_text_ram; dest < &_etext_ram; )
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{
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*dest++ = *src++;
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}
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/* Change Shadow memory to Real RAM */
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CREG_M4MEMMAP = (unsigned long)&_text_ram;
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/* Continue Execution in RAM */
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}
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for (src = &_etext, dest = &_data; dest < &_edata; src++, dest++)
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*dest = *src;
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