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LPC1788 PLL configuration from Rommel Marcelo

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5654 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2013-02-16 12:46:09 +00:00
parent a8abef3907
commit ca846f82d5
1 changed files with 26 additions and 19 deletions
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45
configs/open1788/include/board.h
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@ -61,15 +61,16 @@
#define BOARD_OSCCLK_FREQUENCY BOARD_XTAL_FREQUENCY /* Main oscillator frequency */ #define BOARD_OSCCLK_FREQUENCY BOARD_XTAL_FREQUENCY /* Main oscillator frequency */
#define BOARD_RTCCLK_FREQUENCY (32768) /* RTC oscillator frequency */ #define BOARD_RTCCLK_FREQUENCY (32768) /* RTC oscillator frequency */
#define BOARD_INTRCOSC_FREQUENCY (4000000) /* Internal RC oscillator frequency */ #define BOARD_INTRCOSC_FREQUENCY (4000000) /* Internal RC oscillator frequency */
#define BOARD_WDTOSC_FREQUENCY (500000) /* WDT oscillator frequency */
/* This is the clock setup we configure for: /* This is the clock setup we configure for:
* *
* SYSCLK = BOARD_OSCCLK_FREQUENCY = 12MHz -> Select Main oscillator for source * SYSCLK = BOARD_OSCCLK_FREQUENCY = 12MHz -> Select Main oscillator for source
* PLL0CLK = (2 * 20 * SYSCLK) / 1 = 480MHz -> PLL0 multipler=20, pre-divider=1 * PLL0CLK = (10 * SYSCLK) / 1 = 120MHz -> PLL0 multipler=10, pre-divider=1
* CCLCK = 480MHz / 6 = 80MHz -> CCLK divider = 6 * CCLCK = 120MHz -> CCLK divider = 1
*/ */
#define LPC17_CCLK 80000000 /* 80Mhz */ #define LPC17_CCLK 120000000 /* 120Mhz */
/* Select the main oscillator as the frequency source. SYSCLK is then the frequency /* Select the main oscillator as the frequency source. SYSCLK is then the frequency
* of the main oscillator. * of the main oscillator.
@ -89,44 +90,50 @@
/* PLL0. PLL0 is used to generate the CPU clock divider input (PLLCLK). /* PLL0. PLL0 is used to generate the CPU clock divider input (PLLCLK).
* *
* Source clock: Main oscillator * Source clock: Main oscillator
* PLL0 Multiplier value (M): 20 * PLL0 Multiplier value (M): 10
* PLL0 Pre-divider value (N): 1 * PLL0 Pre-divider value (P): 1
* *
* PLL0CLK = (2 * 20 * SYSCLK) / 1 = 480MHz * PLL0CLK = (M * SYSCLK) = 120MHz
*/ */
#undef CONFIG_LPC17_PLL0 #undef CONFIG_LPC17_PLL0
#define CONFIG_LPC17_PLL0 1 #define CONFIG_LPC17_PLL0 1
#define BOARD_CLKSRCSEL_VALUE SYSCON_CLKSRCSEL_MAIN #define BOARD_CLKSRCSEL_VALUE SYSCON_CLKSRCSEL_MAIN
#define BOARD_PLL0CFG_MSEL 20 #define BOARD_PLL0CFG_MSEL 10
#define BOARD_PLL0CFG_PSEL 1 #define BOARD_PLL0CFG_PSEL 1
#define BOARD_PLL0CFG_VALUE \ #define BOARD_PLL0CFG_VALUE \
(((BOARD_PLL0CFG_MSEL-1) << SYSCON_PLLCFG_MSEL_SHIFT) | \ (((BOARD_PLL0CFG_MSEL-1) << SYSCON_PLLCFG_MSEL_SHIFT) | \
((BOARD_PLL0CFG_PSEL-1) << SYSCON_PLLCFG_PSEL_SHIFT)) ((BOARD_PLL0CFG_PSEL-1) << SYSCON_PLLCFG_PSEL_SHIFT))
/* PLL1 -- Not used. */ #ifdef (CONFIG_LPC17_USBHOST || CONFIG_LPC17_USBDEV)
/* PLL1 : PLL1 is used to generate clock for the USB */
#undef CONFIG_LPC17_PLL1 #undef CONFIG_LPC17_PLL1
#define BOARD_PLL1CFG_MSEL 36 #define CONFIG_LPC17_PLL1 1
#define BOARD_PLL1CFG_NSEL 1 #define BOARD_PLL1CFG_MSEL 4
#define BOARD_PLL1CFG_VALUE \ #define BOARD_PLL1CFG_PSEL 2
(((BOARD_PLL1CFG_MSEL-1) << SYSCON_PLL1CFG_MSEL_SHIFT) | \ #define BOARD_PLL1CFG_VALUE \
((BOARD_PLL1CFG_NSEL-1) << SYSCON_PLL1CFG_NSEL_SHIFT)) (((BOARD_PLL1CFG_MSEL-1) << SYSCON_PLLCFG_MSEL_SHIFT) | \
((BOARD_PLL1CFG_NSEL-1) << SYSCON_PLLCFG_PSEL_SHIFT))
/* USB divider. This divider is used when PLL1 is not enabled to get the /* USB divider. The output of the PLL is used as the USB clock
* USB clock from PLL0:
* *
* USBCLK = PLL0CLK / 10 = 48MHz * USBCLK = PLL1CLK = (SYSCLK * 4) = 48MHz
*/ */
#define BOARD_USBCLKCFG_VALUE SYSCON_USBCLKCFG_DIV10 #define BOARD_USBCLKCFG_VALUE (SYSCON_USBCLKSEL_USBDIV_DIV1 | \
SYSCON_USBCLKSEL_USBSEL_PLL1)
#endif
/* FLASH Configuration */ /* FLASH Configuration */
#undef CONFIG_LP17_FLASH #undef CONFIG_LP17_FLASH
#define CONFIG_LP17_FLASH 1 #define CONFIG_LP17_FLASH 1
#define BOARD_FLASHCFG_VALUE 0x0000303a
/* Flash access use 6 CPU clocks - Safe for any allowed conditions */
#define BOARD_FLASHCFG_VALUE SYSCON_FLASHCFG_TIM_5
/* Ethernet configuration */ /* Ethernet configuration */