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rt-thread/libcpu/arm/lpc1100/CMSIS/system_LPC11xx.c

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add LPC11xx Cortex-M0 porting. git-svn-id: https://rt-thread.googlecode.com/svn/trunk@583 bbd45198-f89e-11dd-88c7-29a3b14d5316
2010-04-06 18:00:28 +08:00
/**************************************************************************//**
* @file system_LPC11xx.c
* @brief CMSIS Cortex-M0 Device Peripheral Access Layer Source File
* for the NXP LPC11xx Device Series
* @version V1.00
* @date 17. November 2009
*
* @note
* Copyright (C) 2009 ARM Limited. All rights reserved.
*
* @par
* ARM Limited (ARM) is supplying this software for use with Cortex-M
* processor based microcontrollers. This file can be freely distributed
* within development tools that are supporting such ARM based processors.
*
* @par
* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
* ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
*
******************************************************************************/
#include <stdint.h>
#include "LPC11xx.h"
/*
//-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
*/
/*--------------------- Clock Configuration ----------------------------------
//
// <e> Clock Configuration
// <e1> System Clock Setup
// <e2> System Oscillator Enable
// <o3.1> Select System Oscillator Frequency Range
// <0=> 1 - 20 MHz
// <1=> 15 - 25 MHz
// </e2>
// <e4> Watchdog Oscillator Enable
// <o5.0..4> Select Divider for Fclkana
// <0=> 2 <1=> 4 <2=> 6 <3=> 8
// <4=> 10 <5=> 12 <6=> 14 <7=> 16
// <8=> 18 <9=> 20 <10=> 22 <11=> 24
// <12=> 26 <13=> 28 <14=> 30 <15=> 32
// <16=> 34 <17=> 36 <18=> 38 <19=> 40
// <20=> 42 <21=> 44 <22=> 46 <23=> 48
// <24=> 50 <25=> 52 <26=> 54 <27=> 56
// <28=> 58 <29=> 60 <30=> 62 <31=> 64
// <o5.5..8> Select Watchdog Oscillator Analog Frequency (Fclkana)
// <0=> Disabled
// <1=> 0.5 MHz
// <2=> 0.8 MHz
// <3=> 1.1 MHz
// <4=> 1.4 MHz
// <5=> 1.6 MHz
// <6=> 1.8 MHz
// <7=> 2.0 MHz
// <8=> 2.2 MHz
// <9=> 2.4 MHz
// <10=> 2.6 MHz
// <11=> 2.7 MHz
// <12=> 2.9 MHz
// <13=> 3.1 MHz
// <14=> 3.2 MHz
// <15=> 3.4 MHz
// </e4>
// <o6> Select Input Clock for sys_pllclkin (Register: SYSPLLCLKSEL)
// <0=> IRC Oscillator
// <1=> System Oscillator
// <2=> WDT Oscillator
// <3=> Invalid
// <e7> Use System PLL
// <i> F_pll = M * F_in
// <i> F_in must be in the range of 10 MHz to 25 MHz
// <o8.0..4> M: PLL Multiplier Selection
// <1-32><#-1>
// <o8.5..6> P: PLL Divider Selection
// <0=> 2
// <1=> 4
// <2=> 8
// <3=> 16
// <o8.7> DIRECT: Direct CCO Clock Output Enable
// <o8.8> BYPASS: PLL Bypass Enable
// </e7>
// <o9> Select Input Clock for Main clock (Register: MAINCLKSEL)
// <0=> IRC Oscillator
// <1=> Input Clock to System PLL
// <2=> WDT Oscillator
// <3=> System PLL Clock Out
// </e1>
// <o10.0..7> System AHB Divider <0-255>
// <i> 0 = is disabled
// <o11.0> SYS Clock Enable
// <o11.1> ROM Clock Enable
// <o11.2> RAM Clock Enable
// <o11.3> FLASHREG Flash Register Interface Clock Enable
// <o11.4> FLASHARRAY Flash Array Access Clock Enable
// <o11.5> I2C Clock Enable
// <o11.6> GPIO Clock Enable
// <o11.7> CT16B0 Clock Enable
// <o11.8> CT16B1 Clock Enable
// <o11.9> CT32B0 Clock Enable
// <o11.10> CT32B1 Clock Enable
// <o11.11> SSP0 Clock Enable
// <o11.12> UART Clock Enable
// <o11.13> ADC Clock Enable
// <o11.15> WDT Clock Enable
// <o11.16> IOCON Clock Enable
// <o11.18> SSP1 Clock Enable
//
// <o12.0..7> SSP0 Clock Divider <0-255>
// <i> 0 = is disabled
// <o13.0..7> UART Clock Divider <0-255>
// <i> 0 = is disabled
// <o14.0..7> SSP1 Clock Divider <0-255>
// <i> 0 = is disabled
// </e>
*/
#define CLOCK_SETUP 1
#define SYSCLK_SETUP 1
#define SYSOSC_SETUP 1
#define SYSOSCCTRL_Val 0x00000000
#define WDTOSC_SETUP 0
#define WDTOSCCTRL_Val 0x000000A0
#define SYSPLLCLKSEL_Val 0x00000001
#define SYSPLL_SETUP 1
#define SYSPLLCTRL_Val 0x00000023
#define MAINCLKSEL_Val 0x00000003
#define SYSAHBCLKDIV_Val 0x00000001
#define AHBCLKCTRL_Val 0x0001005F
#define SSP0CLKDIV_Val 0x00000001
#define UARTCLKDIV_Val 0x00000001
#define SSP1CLKDIV_Val 0x00000001
/*--------------------- Memory Mapping Configuration -------------------------
//
// <e> Memory Mapping
// <o1.0..1> System Memory Remap (Register: SYSMEMREMAP)
// <0=> Bootloader mapped to address 0
// <1=> RAM mapped to address 0
// <2=> Flash mapped to address 0
// <3=> Flash mapped to address 0
// </e>
*/
#define MEMMAP_SETUP 0
#define SYSMEMREMAP_Val 0x00000001
/*
//-------- <<< end of configuration section >>> ------------------------------
*/
/*----------------------------------------------------------------------------
Check the register settings
*----------------------------------------------------------------------------*/
#define CHECK_RANGE(val, min, max) ((val < min) || (val > max))
#define CHECK_RSVD(val, mask) (val & mask)
/* Clock Configuration -------------------------------------------------------*/
#if (CHECK_RSVD((SYSOSCCTRL_Val), ~0x00000003))
#error "SYSOSCCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((WDTOSCCTRL_Val), ~0x000001FF))
#error "WDTOSCCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((SYSPLLCLKSEL_Val), 0, 2))
#error "SYSPLLCLKSEL: Value out of range!"
#endif
#if (CHECK_RSVD((SYSPLLCTRL_Val), ~0x000001FF))
#error "SYSPLLCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((MAINCLKSEL_Val), ~0x00000003))
#error "MAINCLKSEL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((SYSAHBCLKDIV_Val), 0, 255))
#error "SYSAHBCLKDIV: Value out of range!"
#endif
#if (CHECK_RSVD((AHBCLKCTRL_Val), ~0x0001FFFF))
#error "AHBCLKCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((SSP0CLKDIV_Val), 0, 255))
#error "SSP0CLKDIV: Value out of range!"
#endif
#if (CHECK_RANGE((UARTCLKDIV_Val), 0, 255))
#error "UARTCLKDIV: Value out of range!"
#endif
#if (CHECK_RANGE((SSP1CLKDIV_Val), 0, 255))
#error "SSP1CLKDIV: Value out of range!"
#endif
#if (CHECK_RSVD((SYSMEMREMAP_Val), ~0x00000003))
#error "SYSMEMREMAP: Invalid values of reserved bits!"
#endif
/*----------------------------------------------------------------------------
DEFINES
*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
Define clocks
*----------------------------------------------------------------------------*/
#define __XTAL (12000000UL) /* Oscillator frequency */
#define __SYS_OSC_CLK ( __XTAL) /* Main oscillator frequency */
#define __IRC_OSC_CLK (12000000UL) /* Internal RC oscillator frequency */
#define __FREQSEL ((WDTOSCCTRL_Val >> 5) & 0x0F)
#define __DIVSEL (((WDTOSCCTRL_Val & 0x1F) << 1) + 2)
#if (CLOCK_SETUP) /* Clock Setup */
#if (SYSCLK_SETUP) /* System Clock Setup */
#if (WDTOSC_SETUP) /* Watchdog Oscillator Setup*/
#if (__FREQSEL == 0)
#define __WDT_OSC_CLK ( 400000 / __DIVSEL)
#elif (__FREQSEL == 1)
#define __WDT_OSC_CLK ( 500000 / __DIVSEL)
#elif (__FREQSEL == 2)
#define __WDT_OSC_CLK ( 800000 / __DIVSEL)
#elif (__FREQSEL == 3)
#define __WDT_OSC_CLK (1100000 / __DIVSEL)
#elif (__FREQSEL == 4)
#define __WDT_OSC_CLK (1400000 / __DIVSEL)
#elif (__FREQSEL == 5)
#define __WDT_OSC_CLK (1600000 / __DIVSEL)
#elif (__FREQSEL == 6)
#define __WDT_OSC_CLK (1800000 / __DIVSEL)
#elif (__FREQSEL == 7)
#define __WDT_OSC_CLK (2000000 / __DIVSEL)
#elif (__FREQSEL == 8)
#define __WDT_OSC_CLK (2200000 / __DIVSEL)
#elif (__FREQSEL == 9)
#define __WDT_OSC_CLK (2400000 / __DIVSEL)
#elif (__FREQSEL == 10)
#define __WDT_OSC_CLK (2600000 / __DIVSEL)
#elif (__FREQSEL == 11)
#define __WDT_OSC_CLK (2700000 / __DIVSEL)
#elif (__FREQSEL == 12)
#define __WDT_OSC_CLK (2900000 / __DIVSEL)
#elif (__FREQSEL == 13)
#define __WDT_OSC_CLK (3100000 / __DIVSEL)
#elif (__FREQSEL == 14)
#define __WDT_OSC_CLK (3200000 / __DIVSEL)
#else
#define __WDT_OSC_CLK (3400000 / __DIVSEL)
#endif
#else
#define __WDT_OSC_CLK (1600000 / 2)
#endif // WDTOSC_SETUP
/* sys_pllclkin calculation */
#if ((SYSPLLCLKSEL_Val & 0x03) == 0)
#define __SYS_PLLCLKIN (__IRC_OSC_CLK)
#elif ((SYSPLLCLKSEL_Val & 0x03) == 1)
#define __SYS_PLLCLKIN (__SYS_OSC_CLK)
#elif ((SYSPLLCLKSEL_Val & 0x03) == 2)
#define __SYS_PLLCLKIN (__WDT_OSC_CLK)
#else
#define __SYS_PLLCLKIN (0)
#endif
#if (SYSPLL_SETUP) /* System PLL Setup */
#define __SYS_PLLCLKOUT (__SYS_PLLCLKIN * ((SYSPLLCTRL_Val & 0x01F) + 1))
#else
#define __SYS_PLLCLKOUT (__SYS_PLLCLKIN * (1))
#endif // SYSPLL_SETUP
/* main clock calculation */
#if ((MAINCLKSEL_Val & 0x03) == 0)
#define __MAIN_CLOCK (__IRC_OSC_CLK)
#elif ((MAINCLKSEL_Val & 0x03) == 1)
#define __MAIN_CLOCK (__SYS_PLLCLKIN)
#elif ((MAINCLKSEL_Val & 0x03) == 2)
#define __MAIN_CLOCK (__WDT_OSC_CLK)
#elif ((MAINCLKSEL_Val & 0x03) == 3)
#define __MAIN_CLOCK (__SYS_PLLCLKOUT)
#else
#define __MAIN_CLOCK (0)
#endif
#define __SYSTEM_CLOCK (__MAIN_CLOCK / SYSAHBCLKDIV_Val)
#else // SYSCLK_SETUP
#if (SYSAHBCLKDIV_Val == 0)
#define __SYSTEM_CLOCK (0)
#else
#define __SYSTEM_CLOCK (__XTAL / SYSAHBCLKDIV_Val)
#endif
#endif // SYSCLK_SETUP
#else
#define __SYSTEM_CLOCK (__XTAL)
#endif // CLOCK_SETUP
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/
/*----------------------------------------------------------------------------
Clock functions
*----------------------------------------------------------------------------*/
void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */
{
uint32_t wdt_osc = 0;
/* Determine clock frequency according to clock register values */
switch ((LPC_SYSCON->WDTOSCCTRL >> 5) & 0x0F) {
case 0: wdt_osc = 400000; break;
case 1: wdt_osc = 500000; break;
case 2: wdt_osc = 800000; break;
case 3: wdt_osc = 1100000; break;
case 4: wdt_osc = 1400000; break;
case 5: wdt_osc = 1600000; break;
case 6: wdt_osc = 1800000; break;
case 7: wdt_osc = 2000000; break;
case 8: wdt_osc = 2200000; break;
case 9: wdt_osc = 2400000; break;
case 10: wdt_osc = 2600000; break;
case 11: wdt_osc = 2700000; break;
case 12: wdt_osc = 2900000; break;
case 13: wdt_osc = 3100000; break;
case 14: wdt_osc = 3200000; break;
case 15: wdt_osc = 3400000; break;
}
wdt_osc /= ((LPC_SYSCON->WDTOSCCTRL & 0x1F) << 1) + 2;
switch (LPC_SYSCON->MAINCLKSEL & 0x03) {
case 0: /* Internal RC oscillator */
SystemCoreClock = __IRC_OSC_CLK;
break;
case 1: /* Input Clock to System PLL */
switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) {
case 0: /* Internal RC oscillator */
SystemCoreClock = __IRC_OSC_CLK;
break;
case 1: /* System oscillator */
SystemCoreClock = __SYS_OSC_CLK;
break;
case 2: /* WDT Oscillator */
SystemCoreClock = wdt_osc;
break;
case 3: /* Reserved */
SystemCoreClock = 0;
break;
}
break;
case 2: /* WDT Oscillator */
SystemCoreClock = wdt_osc;
break;
case 3: /* System PLL Clock Out */
switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) {
case 0: /* Internal RC oscillator */
if (LPC_SYSCON->SYSPLLCTRL & 0x180) {
SystemCoreClock = __IRC_OSC_CLK;
} else {
SystemCoreClock = __IRC_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1);
}
break;
case 1: /* System oscillator */
if (LPC_SYSCON->SYSPLLCTRL & 0x180) {
SystemCoreClock = __SYS_OSC_CLK;
} else {
SystemCoreClock = __SYS_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1);
}
break;
case 2: /* WDT Oscillator */
if (LPC_SYSCON->SYSPLLCTRL & 0x180) {
SystemCoreClock = wdt_osc;
} else {
SystemCoreClock = wdt_osc * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1);
}
break;
case 3: /* Reserved */
SystemCoreClock = 0;
break;
}
break;
}
SystemCoreClock /= LPC_SYSCON->SYSAHBCLKDIV;
}
/**
* Initialize the system
*
* @param none
* @return none
*
* @brief Setup the microcontroller system.
* Initialize the System.
*/
void SystemInit (void)
{
#if (CLOCK_SETUP) /* Clock Setup */
#if (SYSCLK_SETUP) /* System Clock Setup */
#if (SYSOSC_SETUP) /* System Oscillator Setup */
uint32_t i;
LPC_SYSCON->PDRUNCFG &= ~(1 << 5); /* Power-up System Osc */
LPC_SYSCON->SYSOSCCTRL = SYSOSCCTRL_Val;
for (i = 0; i < 200; i++) __NOP();
LPC_SYSCON->SYSPLLCLKSEL = SYSPLLCLKSEL_Val; /* Select PLL Input */
LPC_SYSCON->SYSPLLCLKUEN = 0x01; /* Update Clock Source */
LPC_SYSCON->SYSPLLCLKUEN = 0x00; /* Toggle Update Register */
LPC_SYSCON->SYSPLLCLKUEN = 0x01;
while (!(LPC_SYSCON->SYSPLLCLKUEN & 0x01)); /* Wait Until Updated */
#if (SYSPLL_SETUP) /* System PLL Setup */
LPC_SYSCON->SYSPLLCTRL = SYSPLLCTRL_Val;
LPC_SYSCON->PDRUNCFG &= ~(1 << 7); /* Power-up SYSPLL */
while (!(LPC_SYSCON->SYSPLLSTAT & 0x01)); /* Wait Until PLL Locked */
#endif
#endif
#if (WDTOSC_SETUP) /* Watchdog Oscillator Setup*/
LPC_SYSCON->WDTOSCCTRL = WDTOSCCTRL_Val;
LPC_SYSCON->PDRUNCFG &= ~(1 << 6); /* Power-up WDT Clock */
#endif
LPC_SYSCON->MAINCLKSEL = MAINCLKSEL_Val; /* Select PLL Clock Output */
LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */
LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */
LPC_SYSCON->MAINCLKUEN = 0x01;
while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */
#endif
LPC_SYSCON->SYSAHBCLKDIV = SYSAHBCLKDIV_Val;
LPC_SYSCON->SYSAHBCLKCTRL = AHBCLKCTRL_Val;
LPC_SYSCON->SSP0CLKDIV = SSP0CLKDIV_Val;
LPC_SYSCON->UARTCLKDIV = UARTCLKDIV_Val;
LPC_SYSCON->SSP1CLKDIV = SSP1CLKDIV_Val;
#endif
#if (MEMMAP_SETUP || MEMMAP_INIT) /* Memory Mapping Setup */
LPC_SYSCON->SYSMEMREMAP = SYSMEMREMAP_Val;
#endif
}