nuttx/arch/arm/src/lpc54xx/lpc54_timerisr.c
Gregory Nutt 8bc90a1899 This adds basic architectural support for the LPC546xx family and includes support for the LPCXpresso-LPC54628 board. The basic NSH port is almost complete... still lacking GPIO support and LED support. There are still no significant drivers available.
Squashed commit of the following:

    arch/arm/src/lpc54xx:  Finish off some missing logic.  Complete now execpt for GPIO and LED support.
    arch/arm/src/lpc54xx:  Add lpc54_clrpend.c
    arch/arm/src/lpc54xx:  Serial driver is complete and compiles.
    arch/arm/src/lpc54xx:  Add beginning of a serial driver (still missing some logic)
    arch/arm/src/lpc54xx:  Fleshes out low level USART intialization.
    arch/arm/src/lpc546xx/Kconfig: Add hooks to integrate with common seril upper half.
    arch/arm/src/lpc54xx:  Beginning of USART console support.
    arch/arm/src/lpc54xx: Completes very basic clock configuration.
    arch/arm/src/lpc54xx:  Add clocking logic (still not complete)
    arch/arm/src/lpc54xx:  Beginning of PLL configuration logic.
    arch/arm/src/lpc54xx:  Fix a few things from first compile attempt.  Compilation cannot work until I at least finish the clock configuration logic.
    arch/arm/src/lpc54xx: Addes some SysTick logic.
    arch/arm/src/lpc54xx:  Completes basic startup logic (sans clock configuration) and interrupt configuration.
     arch/arm/src/lpc54xx:  Add generic ARMv7-M start-up logic (needs LPC54628 customizations); add emtpy file that will eventually hold the clock configuration logic.
    arch/arm/src/lpc54xx:  Add (incomplete) SYSCON register definition header file.
    arch/arm/src/lpc54xx:  Add FLEXCOMM header file.
    arch/arm/src/lpc54xx:  Bring in tickless clock logic from LPC43; configs/lpcxpresso-lpc54628: mount procfs if enabled.
    arch/arm/src/lpc54xx: Add RIT clock definitions; add SysTick initialization (not finished)
    LPC54xx and LPCXpresso-LPC54628: add more boilerplate files and stubbed out files.
    arch/arm/src/lpc54xx:  Add (incomplete) USART header file.
    Add another condition to a Kconfig; refresh a defconfig.
    arch/arm/src/lpc54xx/chip: Add LPC54628 memory map header files.
    configs/lpcxpresso-lpc54628:  Add basic build files for the LPCXpresso-LPC54628
    arch/: Basic build directory structure for the LPC54628
2017-12-07 13:30:02 -06:00

172 lines
6.0 KiB
C

/****************************************************************************
* arch/arm/src/lpc54xx/lpc54_timerisr.c
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <time.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <arch/board/board.h>
#include "nvic.h"
#include "clock/clock.h"
#include "up_internal.h"
#include "up_arch.h"
#include "chip/lpc54_syscon.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The SysTick clock may be clocked internally either by the by the system
* clock (CLKSOURCE==1) or by the SysTick function clock (CLKSOURCE==0).
* The SysTick Function clock is equal to:
*
* Fsystick = Fmainclk / SYSTICKCLKDIV
*
* Both the divider value (BOARD_SYSTICKCLKDIV) and the resulting SysTick
* function clock frequency (Fsystick, BOARD_SYSTICK_CLOCK)
*
* The desired timer interrupt frequency is provided by the definition
* CLK_TCK (see include/time.h). CLK_TCK defines the desired number of
* system clock ticks per second. That value is a user configurable setting
* that defaults to 100 (100 ticks per second = 10 MS interval).
*
* reload = (Fsystick / CLK_TICK) - 1
*
* Tips for selecting BOARD_SYSTICKCLKDIV: The resulting reload value
* should be as large as possible, but must be less than 2^24:
*
* SYSTICKDIV > Fmainclk / CLK_TCK / 2^24
*/
#define SYSTICK_RELOAD ((BOARD_SYSTICK_CLOCK / CLK_TCK) - 1)
/* The size of the reload field is 24 bits. Verify that the reload value
* will fit in the reload register.
*/
#if SYSTICK_RELOAD > 0x00ffffff
# error SYSTICK_RELOAD exceeds the range of the RELOAD register
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: lpc54_timerisr
*
* Description:
* The timer ISR will perform a variety of services for various portions
* of the systems.
*
****************************************************************************/
static int lpc54_timerisr(int irq, uint32_t *regs, void *arg)
{
/* Process timer interrupt */
sched_process_timer();
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: arm_timer_initialize
*
* Description:
* This function is called during start-up to initialize
* the timer interrupt.
*
****************************************************************************/
void arm_timer_initialize(void)
{
uint32_t regval;
/* May be clocked internally by the system clock or the SysTick function
* clock. Set the SysTick clock divider in the SYSCON_SYSTICK register.
* Since this function is called early after reset, it is safe to assume
* that the SysTick is disabled and so that no reset or halt actions are
* necessary.
*/
regval = (SYSCON_SYSTICKCLKDIV_DIV(BOARD_SYSTICKCLKDIV) |
SYSCON_SYSTICKCLKDIV_REQFLAG);
putreg32(regval, LPC54_SYSCON_SYSTICKCLKDIV);
/* The request flag will be cleared when the divider change is complete */
while ((getreg32(LPC54_SYSCON_SYSTICKCLKDIV) & SYSCON_SYSTICKCLKDIV_REQFLAG) != 0)
{
}
/* Make sure that the SYSTICK clock source is set to use the SysTick
* function clock (CLKSOURCE==0).
*/
regval = getreg32(NVIC_SYSTICK_CTRL);
regval &= ~NVIC_SYSTICK_CTRL_CLKSOURCE;
putreg32(regval, NVIC_SYSTICK_CTRL);
/* Configure SysTick to interrupt at the requested rate */
putreg32(SYSTICK_RELOAD, NVIC_SYSTICK_RELOAD);
/* Attach the timer interrupt vector */
(void)irq_attach(LPC54_IRQ_SYSTICK, (xcpt_t)lpc54_timerisr, NULL);
/* Enable SysTick interrupts */
putreg32((NVIC_SYSTICK_CTRL_CLKSOURCE | NVIC_SYSTICK_CTRL_TICKINT |
NVIC_SYSTICK_CTRL_ENABLE), NVIC_SYSTICK_CTRL);
/* And enable the timer interrupt */
up_enable_irq(LPC54_IRQ_SYSTICK);
}