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Add Kinetis startup logic

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3874 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2011-08-12 19:57:12 +00:00
parent d783d5c95f
commit 3575d64b9f
4 changed files with 693 additions and 5 deletions
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9
arch/arm/include/kinetis/irq.h
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@ -75,6 +75,8 @@
/* External interrupts (vectors >= 16) */
#define KINETIS_IRQ_EXTINT (16)
/* K40 Family ***********************************************************************
*
* The interrupt vectors for the following parts is defined in Freescale document
@ -184,7 +186,8 @@
* now) seems to justify the waste.
*/
# define NR_IRQS (111) /* 111 vectors, 94 interrupts, 111 IRQ numbers */
# define NR_VECTORS (111) /* 111 vectors */
# define NR_IRQS (111) /* 94 interrupts but 111 IRQ numbers */
/* K60 Family ***********************************************************************
*
@ -297,8 +300,8 @@
* now) seems to justify the waste.
*/
# define NR_IRQS (108)
# define NR_IRQS (111) /* 120 vectors, 97 interrupts, 108 IRQ numbers */
# define NR_VECTORS (120) /* 120 vectors */
# define NR_IRQS (108) /* 97 interrupts but 108 IRQ numbers */
#else
/* The interrupt vectors for other parts are defined in other documents and may or

5
arch/arm/src/kinetis/Make.defs
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@ -58,8 +58,9 @@ endif
CHIP_ASRCS =
#CHIP_CSRCS = kinetis_allocateheap.c kinetis_can.c kinetis_clockconfig.c \
# kinetis_clrpend.c kinetis_gpio.c kinetis_idle.c kinetis_irq.c kinetis_lowputc.c \
# kinetis_serial.c kinetis_spi.c kinetis_ssp.c kinetis_start.c kinetis_timerisr.c
# kinetis_clrpend.c kinetis_gpio.c kinetis_idle.c kinetis_lowputc.c \
# kinetis_serial.c kinetis_spi.c kinetis_ssp.c kinetis_timerisr.c
CHIP_CSRCS = kinetis_irq.c kinetis_start.c
# Configuration-dependent Kinetis files

533
arch/arm/src/kinetis/kinetis_irq.c Executable file
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@ -0,0 +1,533 @@
/****************************************************************************
* arch/arm/src/lpc17/kinetis_irq.c
* arch/arm/src/chip/kinetis_irq.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <arch/irq.h>
#include "nvic.h"
#include "up_arch.h"
#include "os_internal.h"
#include "up_internal.h"
#include "kinetis_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Enable NVIC debug features that are probably only desireable during
* bringup
*/
#undef KINETIS_IRQ_DEBUG
/* Get a 32-bit version of the default priority */
#define DEFPRIORITY32 \
(NVIC_SYSH_PRIORITY_DEFAULT << 24 |\
NVIC_SYSH_PRIORITY_DEFAULT << 16 |\
NVIC_SYSH_PRIORITY_DEFAULT << 8 |\
NVIC_SYSH_PRIORITY_DEFAULT)
/****************************************************************************
* Public Data
****************************************************************************/
volatile uint32_t *current_regs;
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: kinetis_dumpnvic
*
* Description:
* Dump some interesting NVIC registers
*
****************************************************************************/
#if defined(KINETIS_IRQ_DEBUG) && defined (CONFIG_DEBUG)
static void kinetis_dumpnvic(const char *msg, int irq)
{
irqstate_t flags;
flags = irqsave();
slldbg("NVIC (%s, irq=%d):\n", msg, irq);
slldbg(" INTCTRL: %08x VECTAB: %08x\n",
getreg32(NVIC_INTCTRL), getreg32(NVIC_VECTAB));
#if 0
slldbg(" SYSH ENABLE MEMFAULT: %08x BUSFAULT: %08x USGFAULT: %08x SYSTICK: %08x\n",
getreg32(NVIC_SYSHCON_MEMFAULTENA), getreg32(NVIC_SYSHCON_BUSFAULTENA),
getreg32(NVIC_SYSHCON_USGFAULTENA), getreg32(NVIC_SYSTICK_CTRL_ENABLE));
#endif
slldbg(" IRQ ENABLE: %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ0_31_ENABLE), getreg32(NVIC_IRQ32_63_ENABLE);
getreg32(NVIC_IRQ64_95_ENABLE), getreg32(NVIC_IRQ96_127_ENABLE));
slldbg(" SYSH_PRIO: %08x %08x %08x\n",
getreg32(NVIC_SYSH4_7_PRIORITY), getreg32(NVIC_SYSH8_11_PRIORITY),
getreg32(NVIC_SYSH12_15_PRIORITY));
slldbg(" IRQ PRIO: %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ0_3_PRIORITY), getreg32(NVIC_IRQ4_7_PRIORITY),
getreg32(NVIC_IRQ8_11_PRIORITY), getreg32(NVIC_IRQ12_15_PRIORITY));
slldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ16_19_PRIORITY), getreg32(NVIC_IRQ20_23_PRIORITY),
getreg32(NVIC_IRQ24_27_PRIORITY), getreg32(NVIC_IRQ28_31_PRIORITY));
slldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ32_35_PRIORITY), getreg32(NVIC_IRQ36_39_PRIORITY),
getreg32(NVIC_IRQ40_43_PRIORITY), getreg32(NVIC_IRQ44_47_PRIORITY));
slldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ48_51_PRIORITY), getreg32(NVIC_IRQ52_55_PRIORITY),
getreg32(NVIC_IRQ56_59_PRIORITY), getreg32(NVIC_IRQ60_63_PRIORITY));
slldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ64_67_PRIORITY), getreg32(NVIC_IRQ68_71_PRIORITY),
getreg32(NVIC_IRQ72_75_PRIORITY), getreg32(NVIC_IRQ76_79_PRIORITY));
slldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ80_83_PRIORITY), getreg32(NVIC_IRQ84_87_PRIORITY),
getreg32(NVIC_IRQ88_91_PRIORITY), getreg32(NVIC_IRQ92_95_PRIORITY));
slldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ96_99_PRIORITY), getreg32(NVIC_IRQ100_103_PRIORITY),
getreg32(NVIC_IRQ104_107_PRIORITY), getreg32(NVIC_IRQ108_111_PRIORITY));
#if NR_VECTORS > 111
slldbg(" %08x %08x\n",
getreg32(NVIC_IRQ112_115_PRIORITY), getreg32(NVIC_IRQ116_119_PRIORITY));
#endif
irqrestore(flags);
}
#else
# define kinetis_dumpnvic(msg, irq)
#endif
/****************************************************************************
* Name: kinetis_nmi, kinetis_busfault, kinetis_usagefault, kinetis_pendsv,
* kinetis_dbgmonitor, kinetis_pendsv, kinetis_reserved
*
* Description:
* Handlers for various execptions. None are handled and all are fatal
* error conditions. The only advantage these provided over the default
* unexpected interrupt handler is that they provide a diagnostic output.
*
****************************************************************************/
#ifdef CONFIG_DEBUG
static int kinetis_nmi(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! NMI received\n");
PANIC(OSERR_UNEXPECTEDISR);
return 0;
}
static int kinetis_busfault(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Bus fault recived\n");
PANIC(OSERR_UNEXPECTEDISR);
return 0;
}
static int kinetis_usagefault(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Usage fault received\n");
PANIC(OSERR_UNEXPECTEDISR);
return 0;
}
static int kinetis_pendsv(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! PendSV received\n");
PANIC(OSERR_UNEXPECTEDISR);
return 0;
}
static int kinetis_dbgmonitor(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Debug Monitor receieved\n");
PANIC(OSERR_UNEXPECTEDISR);
return 0;
}
static int kinetis_reserved(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Reserved interrupt\n");
PANIC(OSERR_UNEXPECTEDISR);
return 0;
}
#endif
/****************************************************************************
* Name: kinetis_irqinfo
*
* Description:
* Given an IRQ number, provide the register and bit setting to enable or
* disable the irq.
*
****************************************************************************/
static int kinetis_irqinfo(int irq, uint32_t *regaddr, uint32_t *bit)
{
DEBUGASSERT(irq >= KINETIS_IRQ_NMI && irq < NR_IRQS);
/* Check for external interrupt */
if (irq >= KINETIS_IRQ_EXTINT)
{
if (irq < (KINETIS_IRQ_EXTINT+32))
{
*regaddr = NVIC_IRQ0_31_ENABLE;
*bit = 1 << (irq - KINETIS_IRQ_EXTINT);
}
else if (irq < (KINETIS_IRQ_EXTINT+64))
{
*regaddr = NVIC_IRQ32_63_ENABLE;
*bit = 1 << (irq - KINETIS_IRQ_EXTINT - 32);
}
else if (irq < (KINETIS_IRQ_EXTINT+96))
{
*regaddr = NVIC_IRQ64_95_ENABLE;
*bit = 1 << (irq - KINETIS_IRQ_EXTINT - 64);
}
else if (irq < NR_IRQS)
{
*regaddr = NVIC_IRQ96_127_ENABLE;
*bit = 1 << (irq - KINETIS_IRQ_EXTINT - 96);
}
else
{
return ERROR; /* Invalid irq */
}
}
/* Handle processor exceptions. Only a few can be disabled */
else
{
*regaddr = NVIC_SYSHCON;
if (irq == KINETIS_IRQ_MEMFAULT)
{
*bit = NVIC_SYSHCON_MEMFAULTENA;
}
else if (irq == KINETIS_IRQ_BUSFAULT)
{
*bit = NVIC_SYSHCON_BUSFAULTENA;
}
else if (irq == KINETIS_IRQ_USAGEFAULT)
{
*bit = NVIC_SYSHCON_USGFAULTENA;
}
else if (irq == KINETIS_IRQ_SYSTICK)
{
*regaddr = NVIC_SYSTICK_CTRL;
*bit = NVIC_SYSTICK_CTRL_ENABLE;
}
else
{
return ERROR; /* Invalid or unsupported exception */
}
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_irqinitialize
****************************************************************************/
void up_irqinitialize(void)
{
/* Disable all interrupts */
putreg32(0, NVIC_IRQ0_31_ENABLE);
putreg32(0, NVIC_IRQ32_63_ENABLE);
putreg32(0, NVIC_IRQ64_95_ENABLE);
putreg32(0, NVIC_IRQ96_127_ENABLE);
/* Set all interrrupts (and exceptions) to the default priority */
putreg32(DEFPRIORITY32, NVIC_SYSH4_7_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_SYSH8_11_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_SYSH12_15_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ0_3_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ4_7_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ8_11_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ12_15_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ16_19_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ20_23_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ24_27_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ28_31_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ32_35_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ36_39_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ40_43_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ44_47_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ48_51_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ52_55_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ56_59_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ60_63_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ64_67_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ68_71_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ72_75_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ76_79_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ80_83_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ84_87_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ88_91_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ92_95_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ96_99_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ100_103_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ104_107_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_IRQ108_111_PRIORITY); /* K40 has 111 defined vectors */
#if NR_VECTORS > 111
putreg32(DEFPRIORITY32, NVIC_IRQ112_115_PRIORITY); /* K60 has 120 defined vectors */
putreg32(DEFPRIORITY32, NVIC_IRQ116_119_PRIORITY);
#endif
/* currents_regs is non-NULL only while processing an interrupt */
current_regs = NULL;
/* Attach the SVCall and Hard Fault exception handlers. The SVCall
* exception is used for performing context switches; The Hard Fault
* must also be caught because a SVCall may show up as a Hard Fault
* under certain conditions.
*/
irq_attach(KINETIS_IRQ_SVCALL, up_svcall);
irq_attach(KINETIS_IRQ_HARDFAULT, up_hardfault);
/* Set the priority of the SVCall interrupt */
#ifdef CONFIG_ARCH_IRQPRIO
/* up_prioritize_irq(KINETIS_IRQ_PENDSV, NVIC_SYSH_PRIORITY_MIN); */
#endif
/* If the MPU is enabled, then attach and enable the Memory Management
* Fault handler.
*/
#ifdef CONFIG_ARMV7M_MPU
irq_attach(KINETIS_IRQ_MEMFAULT, up_memfault);
up_enable_irq(KINETIS_IRQ_MEMFAULT);
#endif
/* Attach all other processor exceptions (except reset and sys tick) */
#ifdef CONFIG_DEBUG
irq_attach(KINETIS_IRQ_NMI, kinetis_nmi);
#ifndef CONFIG_ARMV7M_MPU
irq_attach(KINETIS_IRQ_MEMFAULT, up_memfault);
#endif
irq_attach(KINETIS_IRQ_BUSFAULT, kinetis_busfault);
irq_attach(KINETIS_IRQ_USAGEFAULT, kinetis_usagefault);
irq_attach(KINETIS_IRQ_PENDSV, kinetis_pendsv);
irq_attach(KINETIS_IRQ_DBGMONITOR, kinetis_dbgmonitor);
irq_attach(KINETIS_IRQ_RESERVED, kinetis_reserved);
#endif
kinetis_dumpnvic("initial", NR_IRQS);
/* Initialize FIQs */
#ifdef CONFIG_ARCH_FIQ
up_fiqinitialize();
#endif
/* Initialize logic to support a second level of interrupt decoding for
* GPIO pins.
*/
#ifdef CONFIG_GPIO_IRQ
kinetis_gpioirqinitialize();
#endif
/* And finally, enable interrupts */
#ifndef CONFIG_SUPPRESS_INTERRUPTS
setbasepri(NVIC_SYSH_PRIORITY_MAX);
irqrestore(0);
#endif
}
/****************************************************************************
* Name: up_disable_irq
*
* Description:
* Disable the IRQ specified by 'irq'
*
****************************************************************************/
void up_disable_irq(int irq)
{
uint32_t regaddr;
uint32_t regval;
uint32_t bit;
if (kinetis_irqinfo(irq, &regaddr, &bit) == 0)
{
/* Clear the appropriate bit in the register to enable the interrupt */
regval = getreg32(regaddr);
regval &= ~bit;
putreg32(regval, regaddr);
}
#ifdef CONFIG_GPIO_IRQ
else
{
/* Maybe it is a (derived) GPIO IRQ */
kinetis_gpioirqdisable(irq);
}
#endif
kinetis_dumpnvic("disable", irq);
}
/****************************************************************************
* Name: up_enable_irq
*
* Description:
* Enable the IRQ specified by 'irq'
*
****************************************************************************/
void up_enable_irq(int irq)
{
uint32_t regaddr;
uint32_t regval;
uint32_t bit;
if (kinetis_irqinfo(irq, &regaddr, &bit) == 0)
{
/* Set the appropriate bit in the register to enable the interrupt */
regval = getreg32(regaddr);
regval |= bit;
putreg32(regval, regaddr);
}
#ifdef CONFIG_GPIO_IRQ
else
{
/* Maybe it is a (derived) GPIO IRQ */
kinetis_gpioirqenable(irq);
}
#endif
kinetis_dumpnvic("enable", irq);
}
/****************************************************************************
* Name: up_maskack_irq
*
* Description:
* Mask the IRQ and acknowledge it
*
****************************************************************************/
void up_maskack_irq(int irq)
{
up_disable_irq(irq);
#if 0 /* Does not appear to be necessary in most cases */
kinetis_clrpend(irq);
#endif
}
/****************************************************************************
* Name: up_prioritize_irq
*
* Description:
* Set the priority of an IRQ.
*
* Since this API is not supported on all architectures, it should be
* avoided in common implementations where possible.
*
****************************************************************************/
#ifdef CONFIG_ARCH_IRQPRIO
int up_prioritize_irq(int irq, int priority)
{
uint32_t regaddr;
uint32_t regval;
int shift;
DEBUGASSERT(irq >= KINETIS_IRQ_MEMFAULT && irq < NR_IRQS && (unsigned)priority <= NVIC_SYSH_PRIORITY_MIN);
if (irq < KINETIS_IRQ_EXTINT)
{
irq -= 4;
regaddr = NVIC_SYSH_PRIORITY(irq);
}
else
{
irq -= KINETIS_IRQ_EXTINT;
regaddr = NVIC_IRQ_PRIORITY(irq);
}
regval = getreg32(regaddr);
shift = ((irq & 3) << 3);
regval &= ~(0xff << shift);
regval |= (priority << shift);
putreg32(regval, regaddr);
kinetis_dumpnvic("prioritize", irq);
return OK;
}
#endif

151
arch/arm/src/kinetis/kinetis_start.c Executable file
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@ -0,0 +1,151 @@
/****************************************************************************
* arch/arm/src/kinetis/kinetis_start.c
* arch/arm/src/chip/kinetis_start.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/init.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "up_internal.h"
#include "kinetis_internal.h"
/****************************************************************************
* Private Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: showprogress
*
* Description:
* Print a character on the UART to show boot status.
*
****************************************************************************/
#ifdef CONFIG_DEBUG
# define showprogress(c) up_lowputc(c)
#else
# define showprogress(c)
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: _start
*
* Description:
* This is the reset entry point.
*
****************************************************************************/
void __start(void)
{
const uint32_t *src;
uint32_t *dest;
/* Configure the uart so that we can get debug output as soon as possible */
kinetis_clockconfig();
kinetis_lowsetup();
showprogress('A');
/* Clear .bss. We'll do this inline (vs. calling memset) just to be
* certain that there are no issues with the state of global variables.
*/
for (dest = &_sbss; dest < &_ebss; )
{
*dest++ = 0;
}
showprogress('B');
/* Move the intialized data section from his temporary holding spot in
* FLASH into the correct place in SRAM. The correct place in SRAM is
* give by _sdata and _edata. The temporary location is in FLASH at the
* end of all of the other read-only data (.text, .rodata) at _eronly.
*/
for (src = &_eronly, dest = &_sdata; dest < &_edata; )
{
*dest++ = *src++;
}
showprogress('C');
/* Perform early serial initialization */
#ifdef CONFIG_USE_EARLYSERIALINIT
up_earlyserialinit();
#endif
showprogress('D');
/* Initialize onboard resources */
kinetis_boardinitialize();
showprogress('E');
/* Then start NuttX */
showprogress('\r');
showprogress('\n');
os_start();
/* Shouldn't get here */
for(;;);
}