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/******************************************************************************
* @file: system_LPC17xx.c
* @purpose: CMSIS Cortex-M3 Device Peripheral Access Layer Source File
* for the NXP LPC17xx Device Series
* @version: V1.1
* @date: 18th May 2009
*----------------------------------------------------------------------------
*
* Copyright (C) 2008 ARM Limited. All rights reserved.
*
* ARM Limited (ARM) is supplying this software for use with Cortex-M3
* processor based microcontrollers. This file can be freely distributed
* within development tools that are supporting such ARM based processors.
*
* 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 <lpc17xx.h>
/*
//-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
*/
/*--------------------- Clock Configuration ----------------------------------
//
// <e> Clock Configuration
// <h> System Controls and Status Register (SCS)
// <o1.4> OSCRANGE: Main Oscillator Range Select
// <0=> 1 MHz to 20 MHz
// <1=> 15 MHz to 24 MHz
// <e1.5> OSCEN: Main Oscillator Enable
// </e>
// </h>
//
// <h> Clock Source Select Register (CLKSRCSEL)
// <o2.0..1> CLKSRC: PLL Clock Source Selection
// <0=> Internal RC oscillator
// <1=> Main oscillator
// <2=> RTC oscillator
// </h>
//
// <e3> PLL0 Configuration (Main PLL)
// <h> PLL0 Configuration Register (PLL0CFG)
// F_cco0 = (2 * M * F_in) / N
// F_in must be in the range of 32 kHz to 50 MHz
// F_cco0 must be in the range of 275 MHz to 550 MHz
// <o4.0..14> MSEL: PLL Multiplier Selection
// <6-32768><#-1>
// M Value
// <o4.16..23> NSEL: PLL Divider Selection
// <1-256><#-1>
// N Value
// </h>
// </e>
//
// <e5> PLL1 Configuration (USB PLL)
// <h> PLL1 Configuration Register (PLL1CFG)
// F_usb = M * F_osc or F_usb = F_cco1 / (2 * P)
// F_cco1 = F_osc * M * 2 * P
// F_cco1 must be in the range of 156 MHz to 320 MHz
// <o6.0..4> MSEL: PLL Multiplier Selection
// <1-32><#-1>
// M Value (for USB maximum value is 4)
// <o6.5..6> PSEL: PLL Divider Selection
// <0=> 1
// <1=> 2
// <2=> 4
// <3=> 8
// P Value
// </h>
// </e>
//
// <h> CPU Clock Configuration Register (CCLKCFG)
// <o7.0..7> CCLKSEL: Divide Value for CPU Clock from PLL0
// <2-256:2><#-1>
// </h>
//
// <h> USB Clock Configuration Register (USBCLKCFG)
// <o8.0..3> USBSEL: Divide Value for USB Clock from PLL1
// <0-15>
// Divide is USBSEL + 1
// </h>
//
// <h> Peripheral Clock Selection Register 0 (PCLKSEL0)
// <o9.0..1> PCLK_WDT: Peripheral Clock Selection for WDT
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.2..3> PCLK_TIMER0: Peripheral Clock Selection for TIMER0
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.4..5> PCLK_TIMER1: Peripheral Clock Selection for TIMER1
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.6..7> PCLK_UART0: Peripheral Clock Selection for UART0
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.8..9> PCLK_UART1: Peripheral Clock Selection for UART1
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.12..13> PCLK_PWM1: Peripheral Clock Selection for PWM1
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.14..15> PCLK_I2C0: Peripheral Clock Selection for I2C0
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.16..17> PCLK_SPI: Peripheral Clock Selection for SPI
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.20..21> PCLK_SSP1: Peripheral Clock Selection for SSP1
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.22..23> PCLK_DAC: Peripheral Clock Selection for DAC
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.24..25> PCLK_ADC: Peripheral Clock Selection for ADC
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o9.26..27> PCLK_CAN1: Peripheral Clock Selection for CAN1
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 6
// <o9.28..29> PCLK_CAN2: Peripheral Clock Selection for CAN2
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 6
// <o9.30..31> PCLK_ACF: Peripheral Clock Selection for ACF
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 6
// </h>
//
// <h> Peripheral Clock Selection Register 1 (PCLKSEL1)
// <o10.0..1> PCLK_QEI: Peripheral Clock Selection for the Quadrature Encoder Interface
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.2..3> PCLK_GPIO: Peripheral Clock Selection for GPIOs
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.4..5> PCLK_PCB: Peripheral Clock Selection for the Pin Connect Block
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.6..7> PCLK_I2C1: Peripheral Clock Selection for I2C1
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.10..11> PCLK_SSP0: Peripheral Clock Selection for SSP0
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.12..13> PCLK_TIMER2: Peripheral Clock Selection for TIMER2
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.14..15> PCLK_TIMER3: Peripheral Clock Selection for TIMER3
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.16..17> PCLK_UART2: Peripheral Clock Selection for UART2
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.18..19> PCLK_UART3: Peripheral Clock Selection for UART3
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.20..21> PCLK_I2C2: Peripheral Clock Selection for I2C2
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.22..23> PCLK_I2S: Peripheral Clock Selection for I2S
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.26..27> PCLK_RIT: Peripheral Clock Selection for the Repetitive Interrupt Timer
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.28..29> PCLK_SYSCON: Peripheral Clock Selection for the System Control Block
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// <o10.30..31> PCLK_MC: Peripheral Clock Selection for the Motor Control PWM
// <0=> Pclk = Cclk / 4
// <1=> Pclk = Cclk
// <2=> Pclk = Cclk / 2
// <3=> Pclk = Hclk / 8
// </h>
//
// <h> Power Control for Peripherals Register (PCONP)
// <o11.1> PCTIM0: Timer/Counter 0 power/clock enable
// <o11.2> PCTIM1: Timer/Counter 1 power/clock enable
// <o11.3> PCUART0: UART 0 power/clock enable
// <o11.4> PCUART1: UART 1 power/clock enable
// <o11.6> PCPWM1: PWM 1 power/clock enable
// <o11.7> PCI2C0: I2C interface 0 power/clock enable
// <o11.8> PCSPI: SPI interface power/clock enable
// <o11.9> PCRTC: RTC power/clock enable
// <o11.10> PCSSP1: SSP interface 1 power/clock enable
// <o11.12> PCAD: A/D converter power/clock enable
// <o11.13> PCCAN1: CAN controller 1 power/clock enable
// <o11.14> PCCAN2: CAN controller 2 power/clock enable
// <o11.15> PCGPIO: GPIOs power/clock enable
// <o11.16> PCRIT: Repetitive interrupt timer power/clock enable
// <o11.17> PCMC: Motor control PWM power/clock enable
// <o11.18> PCQEI: Quadrature encoder interface power/clock enable
// <o11.19> PCI2C1: I2C interface 1 power/clock enable
// <o11.21> PCSSP0: SSP interface 0 power/clock enable
// <o11.22> PCTIM2: Timer 2 power/clock enable
// <o11.23> PCTIM3: Timer 3 power/clock enable
// <o11.24> PCUART2: UART 2 power/clock enable
// <o11.25> PCUART3: UART 3 power/clock enable
// <o11.26> PCI2C2: I2C interface 2 power/clock enable
// <o11.27> PCI2S: I2S interface power/clock enable
// <o11.29> PCGPDMA: GP DMA function power/clock enable
// <o11.30> PCENET: Ethernet block power/clock enable
// <o11.31> PCUSB: USB interface power/clock enable
// </h>
//
// <h> Clock Output Configuration Register (CLKOUTCFG)
// <o12.0..3> CLKOUTSEL: Selects clock source for CLKOUT
// <0=> CPU clock
// <1=> Main oscillator
// <2=> Internal RC oscillator
// <3=> USB clock
// <4=> RTC oscillator
// <o12.4..7> CLKOUTDIV: Selects clock divider for CLKOUT
// <1-16><#-1>
// <o12.8> CLKOUT_EN: CLKOUT enable control
// </h>
//
// </e>
*/
#define CLOCK_SETUP 1
#define SCS_Val 0x00000020
#define CLKSRCSEL_Val 0x00000001
#define PLL0_SETUP 1
#define PLL0CFG_Val 0x0000000B
#define PLL1_SETUP 1
#define PLL1CFG_Val 0x00000003
#define CCLKCFG_Val 0x00000003
#define USBCLKCFG_Val 0x00000000
#define PCLKSEL0_Val 0x00000000
#define PCLKSEL1_Val 0x00000000
#define PCONP_Val 0x042887DE
#define CLKOUTCFG_Val 0x00000000
/*--------------------- Flash Accelerator Configuration ----------------------
//
// <e> Flash Accelerator Configuration
// <o1.0..1> FETCHCFG: Fetch Configuration
// <0=> Instruction fetches from flash are not buffered
// <1=> One buffer is used for all instruction fetch buffering
// <2=> All buffers may be used for instruction fetch buffering
// <3=> Reserved (do not use this setting)
// <o1.2..3> DATACFG: Data Configuration
// <0=> Data accesses from flash are not buffered
// <1=> One buffer is used for all data access buffering
// <2=> All buffers may be used for data access buffering
// <3=> Reserved (do not use this setting)
// <o1.4> ACCEL: Acceleration Enable
// <o1.5> PREFEN: Prefetch Enable
// <o1.6> PREFOVR: Prefetch Override
// <o1.12..15> FLASHTIM: Flash Access Time
// <0=> 1 CPU clock (for CPU clock up to 20 MHz)
// <1=> 2 CPU clocks (for CPU clock up to 40 MHz)
// <2=> 3 CPU clocks (for CPU clock up to 60 MHz)
// <3=> 4 CPU clocks (for CPU clock up to 80 MHz)
// <4=> 5 CPU clocks (for CPU clock up to 100 MHz)
// <5=> 6 CPU clocks (for any CPU clock)
// </e>
*/
#define FLASH_SETUP 1
#define FLASHCFG_Val 0x0000303A
/*
//-------- <<< 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((SCS_Val), ~0x00000030))
#error "SCS: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((CLKSRCSEL_Val), 0, 2))
#error "CLKSRCSEL: Value out of range!"
#endif
#if (CHECK_RSVD((PLL0CFG_Val), ~0x00FF7FFF))
#error "PLL0CFG: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((PLL1CFG_Val), ~0x0000007F))
#error "PLL1CFG: Invalid values of reserved bits!"
#endif
#if ((CCLKCFG_Val != 0) && (((CCLKCFG_Val - 1) % 2)))
#error "CCLKCFG: CCLKSEL field does not contain only odd values or 0!"
#endif
#if (CHECK_RSVD((USBCLKCFG_Val), ~0x0000000F))
#error "USBCLKCFG: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((PCLKSEL0_Val), 0x000C0C00))
#error "PCLKSEL0: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((PCLKSEL1_Val), 0x03000300))
#error "PCLKSEL1: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((PCONP_Val), 0x10100821))
#error "PCONP: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((CLKOUTCFG_Val), ~0x000001FF))
#error "CLKOUTCFG: Invalid values of reserved bits!"
#endif
/* Flash Accelerator Configuration -------------------------------------------*/
#if (CHECK_RSVD((FLASHCFG_Val), ~0x0000F07F))
#error "FLASHCFG: Invalid values of reserved bits!"
#endif
/*----------------------------------------------------------------------------
DEFINES
*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
Define clocks
*----------------------------------------------------------------------------*/
#define XTAL (12000000UL) /* Oscillator frequency */
#define OSC_CLK ( XTAL) /* Main oscillator frequency */
#define RTC_CLK ( 32000UL) /* RTC oscillator frequency */
#define IRC_OSC ( 4000000UL) /* Internal RC oscillator frequency */
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
uint32_t SystemFrequency = IRC_OSC; /*!< System Clock Frequency (Core Clock) */
/**
* Initialize the system
*
* @param none
* @return none
*
* @brief Setup the microcontroller system.
* Initialize the System and update the SystemFrequency variable.
*/
void SystemInit (void)
{
#if (CLOCK_SETUP) /* Clock Setup */
SC->SCS = SCS_Val;
if (SCS_Val & (1 << 5)) { /* If Main Oscillator is enabled */
while ((SC->SCS & (1 << 6)) == 0); /* Wait for Oscillator to be ready */
}
SC->CCLKCFG = CCLKCFG_Val; /* Setup Clock Divider */
#if (PLL0_SETUP)
SC->CLKSRCSEL = CLKSRCSEL_Val; /* Select Clock Source for PLL0 */
SC->PLL0CFG = PLL0CFG_Val;
SC->PLL0CON = 0x01; /* PLL0 Enable */
SC->PLL0FEED = 0xAA;
SC->PLL0FEED = 0x55;
while (!(SC->PLL0STAT & (1 << 26))); /* Wait for PLOCK0 */
SC->PLL0CON = 0x03; /* PLL0 Enable & Connect */
SC->PLL0FEED = 0xAA;
SC->PLL0FEED = 0x55;
#endif
#if (PLL1_SETUP)
SC->PLL1CFG = PLL1CFG_Val;
SC->PLL1CON = 0x01; /* PLL1 Enable */
SC->PLL1FEED = 0xAA;
SC->PLL1FEED = 0x55;
while (!(SC->PLL1STAT & (1 << 10))); /* Wait for PLOCK1 */
SC->PLL1CON = 0x03; /* PLL1 Enable & Connect */
SC->PLL1FEED = 0xAA;
SC->PLL1FEED = 0x55;
#else
SC->USBCLKCFG = USBCLKCFG_Val; /* Setup USB Clock Divider */
#endif
SC->PCLKSEL0 = PCLKSEL0_Val; /* Peripheral Clock Selection */
SC->PCLKSEL1 = PCLKSEL1_Val;
SC->PCONP = PCONP_Val; /* Power Control for Peripherals */
SC->CLKOUTCFG = CLKOUTCFG_Val; /* Clock Output Configuration */
#endif
/* Determine clock frequency according to clock register values */
if (((SC->PLL0STAT >> 24) & 3) == 3) {/* If PLL0 enabled and connected */
switch (SC->CLKSRCSEL & 0x03) {
case 0: /* Internal RC oscillator => PLL0 */
case 3: /* Reserved, default to Internal RC */
SystemFrequency = (IRC_OSC *
(((2 * ((SC->PLL0STAT & 0x7FFF) + 1))) /
(((SC->PLL0STAT >> 16) & 0xFF) + 1)) /
((SC->CCLKCFG & 0xFF)+ 1));
break;
case 1: /* Main oscillator => PLL0 */
SystemFrequency = (OSC_CLK *
(((2 * ((SC->PLL0STAT & 0x7FFF) + 1))) /
(((SC->PLL0STAT >> 16) & 0xFF) + 1)) /
((SC->CCLKCFG & 0xFF)+ 1));
break;
case 2: /* RTC oscillator => PLL0 */
SystemFrequency = (RTC_CLK *
(((2 * ((SC->PLL0STAT & 0x7FFF) + 1))) /
(((SC->PLL0STAT >> 16) & 0xFF) + 1)) /
((SC->CCLKCFG & 0xFF)+ 1));
break;
}
} else {
switch (SC->CLKSRCSEL & 0x03) {
case 0: /* Internal RC oscillator => PLL0 */
case 3: /* Reserved, default to Internal RC */
SystemFrequency = IRC_OSC / ((SC->CCLKCFG & 0xFF)+ 1);
break;
case 1: /* Main oscillator => PLL0 */
SystemFrequency = OSC_CLK / ((SC->CCLKCFG & 0xFF)+ 1);
break;
case 2: /* RTC oscillator => PLL0 */
SystemFrequency = RTC_CLK / ((SC->CCLKCFG & 0xFF)+ 1);
break;
}
}
#if (FLASH_SETUP == 1) /* Flash Accelerator Setup */
SC->FLASHCFG = FLASHCFG_Val;
#endif
}

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