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/**************************************************************************//**
* @file system_LPC15xx.c
* @brief CMSIS Cortex-M3 Device System Source File for
* NXP LPC15xx Device Series
* @version V1.00
* @date 19. July 2013
*
* @note
* Copyright (C) 2013 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 "LPC15xx.h"
/*
//-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
*/
/*- SystemCoreClock Configuration -------------------------------------------*/
// <e0> SystemCoreClock Configuration
#define CLOCK_SETUP 1
//
// <h> System Oscillator Control (SYSOSCCTRL)
// <o.0> BYPASS: System Oscillator Bypass Enable
// <i> If enabled then PLL input (sys_osc_clk) is fed
// <i> directly from XTALIN and XTALOUT pins.
// <o.1> FREQRANGE: System Oscillator Frequency Range
// <i> Determines frequency range for Low-power oscillator.
// <0=> 1 - 20 MHz
// <1=> 15 - 25 MHz
// </h>
#define SYSOSCCTRL_Val 0x00000000 // Reset value: 0x000
//
// <o.0..1> System PLL Clock Source Select (SYSPLLCLKSEL)
// <0=> IRC Oscillator
// <1=> Crystal Oscillator (SYSOSC)
#define SYSPLLCLKSEL_Val 0x00000001 // Reset value: 0x000
//
// <e> Clock Configuration (Manual)
#define CLOCK_SETUP_REG 1
//
// <o.0..1> Main Clock Source Select A (MAINCLKSELA)
// <0=> IRC Oscillator
// <1=> System Oscillator
// <2=> WD Oscillator
#define MAINCLKSELA_Val 0x00000001 // Reset value: 0x000
//
// <o.0..1> Main Clock Source Select B (MAINCLKSELB)
// <0=> MAINCLKSELA
// <1=> System PLL Input
// <2=> System PLL Output
// <3=> RTC Oscillator
#define MAINCLKSELB_Val 0x00000002 // Reset value: 0x000
//
// <h> System PLL Setting (SYSPLLCTRL)
// <i> F_clkout = M * F_clkin = F_CCO / (2 * P)
// <i> F_clkin must be in the range of 10 MHz to 25 MHz
// <i> F_CCO must be in the range of 156 MHz to 320 MHz
// <o.0..5> MSEL: Feedback Divider Selection
// <i> M = MSEL + 1
// <0-31>
// <o.5..7> PSEL: Post Divider Selection
// <i> Post divider ratio P. Division ratio is 2 * P
// <0=> P = 1
// <1=> P = 2
// <2=> P = 4
// <3=> P = 8
// </h>
#define SYSPLLCTRL_Val 0x00000005 // Reset value: 0x000
//
// <o.0..7> System AHB Clock Divider (SYSAHBCLKDIV.DIV)
// <i> Divides main clock to provide system clock to core, memories, and peripherals.
// <i> 0 = is disabled
// <0-255>
#define SYSAHBCLKDIV_Val 0x00000001 // Reset value: 0x001
// </e>
//
// <e> Clock Configuration (via ROM PLL API)
#define CLOCK_SETUP_API 0
//
// <o> PLL API Mode Select
// <0=> Exact
// <1=> Less than or equal
// <2=> Greater than or equal
// <3=> As close as possible
#define PLL_API_MODE_Val 0
//
// <o> CPU Frequency [Hz] <1000000-72000000:1000>
#define PLL_API_FREQ_Val 72000000
// </e>
//
// <e> USB Clock Configuration
#define USB_CLOCK_SETUP 0
// <h> USB PLL Control (USBPLLCTRL)
// <i> F_clkout = M * F_clkin = F_CCO / (2 * P)
// <i> F_clkin must be in the range of 10 MHz to 25 MHz
// <i> F_CCO must be in the range of 156 MHz to 320 MHz
// <o.0..5> MSEL: Feedback Divider Selection
// <i> M = MSEL + 1
// <0-31>
// <o.7..6> PSEL: Post Divider Selection
// <i> Post divider ratio P. Division ratio is 2 * P
// <0=> P = 1
// <1=> P = 2
// <2=> P = 4
// <3=> P = 8
// </h>
#define USBPLLCTRL_Val 0x00000023 // Reset value: 0x000
//
// <o.0..1> USB PLL Clock Source Select (USBPLLCLKSEL.SEL)
// <0=> IRC Oscillator
// <1=> System Oscillator
#define USBPLLCLKSEL_Val 0x00000001 // Reset value: 0x000
//
// <o.0..1> USB Clock Source Select (USBCLKSEL.SEL)
// <0=> IRC Oscillator
// <1=> System Oscillator
// <2=> USB PLL out
// <3=> Main clock
#define USBCLKSEL_Val 0x00000002 // Reset value: 0x000
//
// <o.0..7> USB Clock Divider (USBCLKDIV.DIV)
// <i> Divides USB clock to 48 MHz.
// <i> 0 = is disabled
// <0-255>
#define USBCLKDIV_Val 0x00000001 // Reset Value: 0x001
// </e>
//
// <e> SCT Clock Configuration
#define SCT_CLOCK_SETUP 1
// <h> SCT PLL Control (SCTPLLCTRL)
// <i> F_clkout = M * F_clkin = F_CCO / (2 * P)
// <i> F_clkin must be in the range of 10 MHz to 25 MHz
// <i> F_CCO must be in the range of 156 MHz to 320 MHz
// <o.0..5> MSEL: Feedback Divider Selection
// <i> M = MSEL + 1
// <0-31>
// <o.7..6> PSEL: Post Divider Selection
// <i> Post divider ratio P. Division ratio is 2 * P
// <0=> P = 1
// <1=> P = 2
// <2=> P = 4
// <3=> P = 8
// </h>
#define SCTPLLCTRL_Val 0x00000005 // Reset value: 0x000
//
// <o.0..1> SCT PLL Clock Source Select (SCTPLLCLKSEL.SEL)
// <0=> IRC Oscillator
// <1=> System Oscillator
#define SCTPLLCLKSEL_Val 0x00000001 // Reset value: 0x000
// </e>
//
// </e>
//
// <o0>System Oscillator (XTAL) Frequency [Hz] <1000000-25000000>
// <i> XTAL frequency must be in the range of 1 MHz to 25 MHz
//
#define XTAL_CLK_Val 12000000
/*
//-------- <<< end of configuration section >>> ------------------------------
*/
/*----------------------------------------------------------------------------
Define clocks
*----------------------------------------------------------------------------*/
#define __XTAL_CLK ( XTAL_CLK_Val) /* Oscillator freq */
#define __SYS_OSC_CLK ( __XTAL_CLK) /* System oscillator freq */
#define __IRC_OSC_CLK ( 12000000UL) /* Internal RC oscillator freq */
#define __RTC_OSC_CLK ( 32768UL) /* RTC oscillator freq */
#define __WDT_OSC_CLK ( 503000UL) /* WDT oscillator freq */
/*----------------------------------------------------------------------------
Check the register settings
*----------------------------------------------------------------------------*/
#define CHECK_RANGE(val, min, max) ((val < min) || (val > max))
#define CHECK_RSVD(val, mask) (val & mask)
#if (CHECK_RANGE((SYSOSCCTRL_Val), 0, 1))
#error "SYSOSCCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((SYSPLLCLKSEL_Val), 0, 3))
#error "SYSPLLCLKSEL: Value out of range!"
#endif
#if (CHECK_RSVD((SYSPLLCTRL_Val), ~0x000000FF))
#error "SYSPLLCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((MAINCLKSELA_Val), 0, 2))
#error "MAINCLKSELA: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((MAINCLKSELB_Val), ~0x00000003))
#error "MAINCLKSELB: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((SYSAHBCLKDIV_Val), 0, 255))
#error "SYSAHBCLKDIV: Value out of range!"
#endif
#if ( CLOCK_SETUP_REG == CLOCK_SETUP_API )
#error "You must select either manual or API based Clock Configuration!"
#endif
#if (CHECK_RANGE((USBPLLCLKSEL_Val), 0, 1))
#error "USBPLLCLKSEL: Value out of range!"
#endif
#if (CHECK_RSVD((USBPLLCTRL_Val), ~0x00000FF))
#error "USBPLLCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((USBCLKSEL_Val), 0, 3))
#error "USBCLKSEL: Value out of range!"
#endif
#if (CHECK_RANGE((USBCLKDIV_Val), 0, 255))
#error "USBCLKDIV: Value out of range!"
#endif
#if (CHECK_RANGE((SCTPLLCLKSEL_Val), 0, 1))
#error "SCTPLLCLKSEL: Value out of range!"
#endif
#if (CHECK_RSVD((SCTPLLCTRL_Val), ~0x00000FF))
#error "SCTPLLCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE(XTAL_CLK_Val, 1000000, 25000000))
#error "XTAL frequency is out of bounds"
#endif
#if (CHECK_RANGE(PLL_API_MODE_Val, 0, 3))
#error "PLL API Mode Select not valid"
#endif
#if (CHECK_RANGE(PLL_API_FREQ_Val, 1000000, 72000000))
#error "CPU Frequency (API mode) not valid"
#endif
/*----------------------------------------------------------------------------
Calculate system core clock
*----------------------------------------------------------------------------*/
#if (CLOCK_SETUP) /* Clock 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)
#else
#error "Oops"
#endif
#if (CLOCK_SETUP_REG == 1) /* Clock Setup via Register */
#if ((MAINCLKSELA_Val & 0x03) == 0)
#define __MAINA_CLOCK (__IRC_OSC_CLK)
#elif ((MAINCLKSELA_Val & 0x03) == 1)
#define __MAINA_CLOCK (__SYS_OSC_CLK)
#elif ((MAINCLKSELA_Val & 0x03) == 2)
#define __MAINA_CLOCK (__WDT_OSC_CLK)
#else
#error "Oops"
#endif
#define __SYS_PLLCLKOUT (__SYS_PLLCLKIN * ((SYSPLLCTRL_Val & 0x01F) + 1))
/* main clock calculation */
#if ((MAINCLKSELB_Val & 0x03) == 0)
#define __MAINB_CLOCK (__MAINA_CLOCK)
#elif ((MAINCLKSELB_Val & 0x03) == 1)
#define __MAINB_CLOCK (__SYS_PLLCLKIN)
#elif ((MAINCLKSELB_Val & 0x03) == 2)
#define __MAINB_CLOCK (__SYS_PLLCLKOUT)
#elif ((MAINCLKSELB_Val & 0x03) == 3)
#define __MAINB_CLOCK (__RTC_OSC_CLK)
#else
#error "Oops"
#endif
#define __SYSTEM_CLOCK (__MAINB_CLOCK / SYSAHBCLKDIV_Val)
#endif /* Clock Setup via Register */
#if (CLOCK_SETUP_API == 1) /* Clock Setup via ROM API */
#define __SYSTEM_CLOCK (PLL_API_FREQ_Val)
#endif /* Clock Setup via PLL API */
#else
#define __SYSTEM_CLOCK (__IRC_OSC_CLK)
#endif /* CLOCK_SETUP */
#if ((CLOCK_SETUP == 1) && (CLOCK_SETUP_API == 1)) /* PLL Setup via PLL API */
#include "power_api.h"
typedef struct _ROM {
const unsigned p_dev0;
const unsigned p_dev1;
const unsigned p_dev2;
const PWRD * pPWRD; /* ROM Power Management API */
const unsigned p_dev4;
const unsigned p_dev5;
const unsigned p_dev6;
const unsigned p_dev7;
} ROM;
/*----------------------------------------------------------------------------
PLL API Function
*----------------------------------------------------------------------------*/
static void setPLL(const uint32_t pllMode, const uint32_t pllInFreq, const uint32_t reqCpuFreq)
{
uint32_t cmd[5], res[5];
ROM ** rom = (ROM **) 0x03000200; /* pointer to power API calls */
cmd[0] = pllInFreq; /* PLL's input freq in KHz */
cmd[1] = reqCpuFreq; /* requested CPU freq in KHz */
cmd[2] = pllMode;
cmd[3] = 0; /* no timeout for PLL to lock */
/* Execute API call */
(*rom)->pPWRD->set_pll(cmd, res); /* call API function */
if ((res[0] != PLL_CMD_SUCCESS)){ /* in case of an error ... */
while(1); /* ... stay here */
}
}
#endif
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
uint32_t SystemCoreClock = __SYSTEM_CLOCK; /* System Clock Frequency */
/*----------------------------------------------------------------------------
Clock functions
*----------------------------------------------------------------------------*/
void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */
{
/* Determine clock frequency according to clock register values */
switch (LPC_SYSCON->MAINCLKSELB & 0x03) {
case 0: /* MAINCLKSELA clock sel */
switch (LPC_SYSCON->MAINCLKSELA & 0x03) {
case 0: /* Internal RC oscillator */
SystemCoreClock = __IRC_OSC_CLK;
break;
case 1: /* System oscillator */
SystemCoreClock = __SYS_OSC_CLK;
break;
case 2: /* Watchdog oscillator */
SystemCoreClock = __WDT_OSC_CLK;
break;
case 3: /* Reserved */
SystemCoreClock = 0;
break;
}
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: /* Reserved */
case 3: /* Reserved */
SystemCoreClock = 0;
break;
}
break;
case 2: /* System PLL Clock Out */
switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) {
case 0: /* Internal RC oscillator */
SystemCoreClock = __IRC_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1);
break;
case 1: /* System oscillator */
SystemCoreClock = __SYS_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1);
break;
case 2: /* Reserved */
case 3: /* Reserved */
SystemCoreClock = 0;
break;
}
break;
case 3: /* WDT Oscillator */
SystemCoreClock = __WDT_OSC_CLK;
break;
}
SystemCoreClock /= LPC_SYSCON->SYSAHBCLKDIV;
}
/**
* Initialize the system
*
* @param none
* @return none
*
* @brief Setup the microcontroller system.
*/
void SystemInit (void) {
#if (CLOCK_SETUP)
volatile uint32_t i;
#endif
#if (CLOCK_SETUP) /* Clock Setup */
#if ((SYSPLLCLKSEL_Val & 0x03) == 1)
LPC_SYSCON->SYSOSCCTRL = SYSOSCCTRL_Val;
LPC_SYSCON->PDRUNCFG &= ~(1 << 21); /* Power-up sysosc */
for (i = 0; i < 200; i++) __NOP(); /* Wait for osc to stabilize */
#endif
LPC_SYSCON->SYSPLLCLKSEL = SYSPLLCLKSEL_Val; /* Select PLL Input */
#if (CLOCK_SETUP_REG == 1) /* Clock Setup via Register */
#if (((MAINCLKSELA_Val & 0x03) == 1) )
LPC_SYSCON->SYSOSCCTRL = SYSOSCCTRL_Val;
LPC_SYSCON->PDRUNCFG &= ~(1 << 21); /* Power-up sysosc */
for (i = 0; i < 200; i++) __NOP(); /* Wait for osc to stabilize */
#endif
#if (((MAINCLKSELA_Val & 0x03) == 2) )
LPC_SYSCON->PDRUNCFG &= ~(1 << 20); /* Power-up WDT Clock */
for (i = 0; i < 200; i++) __NOP(); /* Wait for osc to stabilize */
#endif
#if ((MAINCLKSELB_Val & 0x03) == 3)
LPC_SYSCON->RTCOSCCTRL = (1 << 0); /* Enable 32 kHz output */
for (i = 0; i < 200; i++) __NOP(); /* Wait for osc to stabilize */
#endif
LPC_SYSCON->MAINCLKSELA = MAINCLKSELA_Val; /* select MAINCLKA clock */
#if ((MAINCLKSELB_Val & 0x03) == 2) /* Main Clock is PLL Out */
LPC_SYSCON->SYSPLLCTRL = SYSPLLCTRL_Val;
LPC_SYSCON->PDRUNCFG &= ~(1 << 22); /* Power-up SYSPLL */
while (!(LPC_SYSCON->SYSPLLSTAT & 0x01)); /* Wait Until PLL Locked */
#endif
LPC_SYSCON->MAINCLKSELB = MAINCLKSELB_Val; /* select Main clock */
LPC_SYSCON->SYSAHBCLKDIV = SYSAHBCLKDIV_Val;
#endif /* Clock Setup via Register */
#if (CLOCK_SETUP_API == 1) /* Clock Setup via PLL API */
// LPC_SYSCON->SYSPLLCLKSEL = 0x00; /* Use IRC */
LPC_SYSCON->MAINCLKSELB = (1 << 2); /* Select System PLL output */
LPC_SYSCON->SYSAHBCLKDIV = 1;
setPLL(PLL_API_MODE_Val, __SYS_PLLCLKIN / 1000, PLL_API_FREQ_Val / 1000);
#endif /* Clock Setup via PLL API */
#if (USB_CLOCK_SETUP == 1) /* USB clock is used */
LPC_SYSCON->PDRUNCFG &= ~(1 << 9); /* Power-up USB PHY */
#if ((USBCLKSEL_Val & 0x003) == 2) /* USB clock is USB PLL out */
LPC_SYSCON->PDRUNCFG &= ~(1 << 23); /* Power-up USB PLL */
LPC_SYSCON->USBPLLCLKSEL = USBPLLCLKSEL_Val; /* Select PLL Input */
LPC_SYSCON->USBPLLCTRL = USBPLLCTRL_Val;
while (!(LPC_SYSCON->USBPLLSTAT & 0x01)); /* Wait Until PLL Locked */
LPC_SYSCON->USBCLKSEL = 0x02; /* Select USB PLL */
#endif
LPC_SYSCON->USBCLKSEL = USBCLKSEL_Val; /* Select USB Clock */
LPC_SYSCON->USBCLKDIV = USBCLKDIV_Val; /* Set USB clock divider */
#else /* USB clock is not used */
LPC_SYSCON->PDRUNCFG |= (1 << 9); /* Power-down USB PHY */
LPC_SYSCON->PDRUNCFG |= (1 << 23); /* Power-down USB PLL */
#endif
#if (SCT_CLOCK_SETUP == 1) /* SCT clock is used */
LPC_SYSCON->PDRUNCFG &= ~(1 << 24); /* Power-up SCT PLL */
LPC_SYSCON->SCTPLLCLKSEL = SCTPLLCLKSEL_Val; /* Select PLL Input */
LPC_SYSCON->SCTPLLCTRL = SCTPLLCTRL_Val;
while (!(LPC_SYSCON->SCTPLLSTAT & 0x01)); /* Wait Until PLL Locked */
#else /* SCT clock is not used */
LPC_SYSCON->PDRUNCFG |= (1 << 24); /* Power-down SCT PLL */
#endif
#endif /* Clock Setup */
LPC_SYSCON->SYSAHBCLKCTRL0 |= (1UL << 12); /* enable clock for SWM */
}
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