121 lines
4.6 KiB
C
121 lines
4.6 KiB
C
/*
|
|
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file LPC13xx/hal_lld.c
|
|
* @brief LPC13xx HAL subsystem low level driver source.
|
|
*
|
|
* @addtogroup HAL
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
#include "hal.h"
|
|
|
|
/**
|
|
* @brief Register missing in NXP header file.
|
|
*/
|
|
#define FLASHCFG (*((volatile uint32_t *)0x4003C010))
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local variables and types. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver interrupt handlers. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Low level HAL driver initialization.
|
|
*
|
|
* @notapi
|
|
*/
|
|
void hal_lld_init(void) {
|
|
|
|
/* SysTick initialization using the system clock.*/
|
|
nvicSetSystemHandlerPriority(HANDLER_SYSTICK, CORTEX_PRIORITY_SYSTICK);
|
|
SysTick->LOAD = LPC13xx_SYSCLK / CH_CFG_FREQUENCY - 1;
|
|
SysTick->VAL = 0;
|
|
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
|
|
SysTick_CTRL_ENABLE_Msk |
|
|
SysTick_CTRL_TICKINT_Msk;
|
|
}
|
|
|
|
/**
|
|
* @brief LPC13xx clocks and PLL initialization.
|
|
* @note All the involved constants come from the file @p board.h.
|
|
* @note This function must be invoked only after the system reset.
|
|
*
|
|
* @special
|
|
*/
|
|
void LPC13xx_clock_init(void) {
|
|
unsigned i;
|
|
|
|
/* Flash wait states setting, the code takes care to not touch TBD bits.*/
|
|
FLASHCFG = (FLASHCFG & ~3) | LPC13xx_FLASHCFG_FLASHTIM;
|
|
|
|
/* System oscillator initialization if required.*/
|
|
#if LPC13xx_MAINCLK_SOURCE == SYSMAINCLKSEL_PLLOUT
|
|
#if LPC13xx_PLLCLK_SOURCE == SYSPLLCLKSEL_SYSOSC
|
|
LPC_SYSCON->SYSOSCCTRL = LPC13xx_SYSOSCCTRL;
|
|
LPC_SYSCON->PDRUNCFG &= ~(1 << 5); /* System oscillator ON. */
|
|
for (i = 0; i < 200; i++)
|
|
__NOP(); /* Stabilization delay. */
|
|
#endif /* LPC13xx_PLLCLK_SOURCE == SYSPLLCLKSEL_SYSOSC */
|
|
|
|
/* PLL initialization if required.*/
|
|
LPC_SYSCON->SYSPLLCLKSEL = LPC13xx_PLLCLK_SOURCE;
|
|
LPC_SYSCON->SYSPLLCLKUEN = 1; /* Really required? */
|
|
LPC_SYSCON->SYSPLLCLKUEN = 0;
|
|
LPC_SYSCON->SYSPLLCLKUEN = 1;
|
|
LPC_SYSCON->SYSPLLCTRL = LPC13xx_SYSPLLCTRL_MSEL | LPC13xx_SYSPLLCTRL_PSEL;
|
|
LPC_SYSCON->PDRUNCFG &= ~(1 << 7); /* System PLL ON. */
|
|
while ((LPC_SYSCON->SYSPLLSTAT & 1) == 0) /* Wait PLL lock. */
|
|
;
|
|
#endif /* LPC13xx_MAINCLK_SOURCE == SYSMAINCLKSEL_PLLOUT */
|
|
|
|
/* Main clock source selection.*/
|
|
LPC_SYSCON->MAINCLKSEL = LPC13xx_MAINCLK_SOURCE;
|
|
LPC_SYSCON->MAINCLKUEN = 1; /* Really required? */
|
|
LPC_SYSCON->MAINCLKUEN = 0;
|
|
LPC_SYSCON->MAINCLKUEN = 1;
|
|
while ((LPC_SYSCON->MAINCLKUEN & 1) == 0) /* Wait switch completion. */
|
|
;
|
|
|
|
/* ABH divider initialization, peripheral clocks are initially disabled,
|
|
the various device drivers will handle their own setup except GPIO and
|
|
IOCON that are left enabled.*/
|
|
LPC_SYSCON->SYSAHBCLKDIV = LPC13xx_SYSABHCLK_DIV;
|
|
LPC_SYSCON->SYSAHBCLKCTRL = 0x0001005F;
|
|
|
|
/* Memory remapping, vectors always in ROM.*/
|
|
LPC_SYSCON->SYSMEMREMAP = 2;
|
|
}
|
|
|
|
/** @} */
|