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libopencm3/lib/vf6xx/vector_chipset.c

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vf6xx: initial add of Vybrid VF6xx support Freescale Vybrid is a familiy of ARM SoC, wheras the VF6xx models have two cores in one SoC, a Cortex-A5 and a Cortex-M4. This adds initial support for the Cortex-M4 in the libopencm3 library. By using two different ram areas (pc_ram and ps_ram) the user can put the code in a RAM area bounded to the code bus. The data can be stored in the data area. However, currently the initial values of for the variables in the data section are stored in the code section and copied to the ram section by the initialization code (like it's copied from ROM to RAM on microcontrollers).
11 years ago
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2014 Stefan Agner <stefan@agner.ch>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/cm3/scb.h>
static inline void pre_main(void)
{
/*
* For Vybrid we need to set the stack pointer manually
* since the boot ROM has its own stack
*/
vf6: use c99 compatible asm syntax. using __asm__ instead of asm allows compilation under both gnu89 (old gcc defaults pre 5.x) and also c99 (gcc 5.x+ defaults)
8 years ago
__asm__ ( \
vf6xx: initial add of Vybrid VF6xx support Freescale Vybrid is a familiy of ARM SoC, wheras the VF6xx models have two cores in one SoC, a Cortex-A5 and a Cortex-M4. This adds initial support for the Cortex-M4 in the libopencm3 library. By using two different ram areas (pc_ram and ps_ram) the user can put the code in a RAM area bounded to the code bus. The data can be stored in the data area. However, currently the initial values of for the variables in the data section are stored in the code section and copied to the ram section by the initialization code (like it&#39;s copied from ROM to RAM on microcontrollers).
11 years ago
"ldr sp,=_stack;" \
);
vf6xx: set vector table to memory Set Vector Table Offset to memory location of our vector table. Since we put the whole programm including the vector table into memory, we need to make use of the Cortex-M4 system control block Vector Table Offset Register (VTOR).
11 years ago
/* Set Vector Table Offset to our memory based vector table */
SCB_VTOR = (uint32_t)&vector_table;
vf6xx: enable floating-point coprocessor
10 years ago
/* Enable access to Floating-Point coprocessor. */
SCB_CPACR |= SCB_CPACR_FULL * (SCB_CPACR_CP10 | SCB_CPACR_CP11);
vf6xx: initial add of Vybrid VF6xx support Freescale Vybrid is a familiy of ARM SoC, wheras the VF6xx models have two cores in one SoC, a Cortex-A5 and a Cortex-M4. This adds initial support for the Cortex-M4 in the libopencm3 library. By using two different ram areas (pc_ram and ps_ram) the user can put the code in a RAM area bounded to the code bus. The data can be stored in the data area. However, currently the initial values of for the variables in the data section are stored in the code section and copied to the ram section by the initialization code (like it&#39;s copied from ROM to RAM on microcontrollers).
11 years ago
}