8bc90a1899
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
172 lines
6.0 KiB
C
172 lines
6.0 KiB
C
/****************************************************************************
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* arch/arm/src/lpc54xx/lpc54_timerisr.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <arch/board/board.h>
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#include "nvic.h"
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#include "clock/clock.h"
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#include "up_internal.h"
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#include "up_arch.h"
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#include "chip/lpc54_syscon.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The SysTick clock may be clocked internally either by the by the system
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* clock (CLKSOURCE==1) or by the SysTick function clock (CLKSOURCE==0).
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* The SysTick Function clock is equal to:
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*
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* Fsystick = Fmainclk / SYSTICKCLKDIV
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*
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* Both the divider value (BOARD_SYSTICKCLKDIV) and the resulting SysTick
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* function clock frequency (Fsystick, BOARD_SYSTICK_CLOCK)
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*
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* The desired timer interrupt frequency is provided by the definition
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* CLK_TCK (see include/time.h). CLK_TCK defines the desired number of
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* system clock ticks per second. That value is a user configurable setting
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* that defaults to 100 (100 ticks per second = 10 MS interval).
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*
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* reload = (Fsystick / CLK_TICK) - 1
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*
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* Tips for selecting BOARD_SYSTICKCLKDIV: The resulting reload value
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* should be as large as possible, but must be less than 2^24:
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*
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* SYSTICKDIV > Fmainclk / CLK_TCK / 2^24
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*/
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#define SYSTICK_RELOAD ((BOARD_SYSTICK_CLOCK / CLK_TCK) - 1)
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/* The size of the reload field is 24 bits. Verify that the reload value
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* will fit in the reload register.
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*/
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#if SYSTICK_RELOAD > 0x00ffffff
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# error SYSTICK_RELOAD exceeds the range of the RELOAD register
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: lpc54_timerisr
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*
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* Description:
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* The timer ISR will perform a variety of services for various portions
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* of the systems.
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*
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****************************************************************************/
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static int lpc54_timerisr(int irq, uint32_t *regs, void *arg)
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{
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/* Process timer interrupt */
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sched_process_timer();
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return 0;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: arm_timer_initialize
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*
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* Description:
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* This function is called during start-up to initialize
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* the timer interrupt.
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*
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****************************************************************************/
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void arm_timer_initialize(void)
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{
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uint32_t regval;
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/* May be clocked internally by the system clock or the SysTick function
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* clock. Set the SysTick clock divider in the SYSCON_SYSTICK register.
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* Since this function is called early after reset, it is safe to assume
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* that the SysTick is disabled and so that no reset or halt actions are
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* necessary.
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*/
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regval = (SYSCON_SYSTICKCLKDIV_DIV(BOARD_SYSTICKCLKDIV) |
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SYSCON_SYSTICKCLKDIV_REQFLAG);
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putreg32(regval, LPC54_SYSCON_SYSTICKCLKDIV);
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/* The request flag will be cleared when the divider change is complete */
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while ((getreg32(LPC54_SYSCON_SYSTICKCLKDIV) & SYSCON_SYSTICKCLKDIV_REQFLAG) != 0)
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{
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}
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/* Make sure that the SYSTICK clock source is set to use the SysTick
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* function clock (CLKSOURCE==0).
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*/
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regval = getreg32(NVIC_SYSTICK_CTRL);
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regval &= ~NVIC_SYSTICK_CTRL_CLKSOURCE;
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putreg32(regval, NVIC_SYSTICK_CTRL);
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/* Configure SysTick to interrupt at the requested rate */
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putreg32(SYSTICK_RELOAD, NVIC_SYSTICK_RELOAD);
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/* Attach the timer interrupt vector */
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(void)irq_attach(LPC54_IRQ_SYSTICK, (xcpt_t)lpc54_timerisr, NULL);
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/* Enable SysTick interrupts */
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putreg32((NVIC_SYSTICK_CTRL_CLKSOURCE | NVIC_SYSTICK_CTRL_TICKINT |
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NVIC_SYSTICK_CTRL_ENABLE), NVIC_SYSTICK_CTRL);
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/* And enable the timer interrupt */
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up_enable_irq(LPC54_IRQ_SYSTICK);
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}
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