diff options
author | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2010-06-12 18:47:02 +0000 |
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committer | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2010-06-12 18:47:02 +0000 |
commit | 2150e3b414de821e3f069a48450cde67821a7585 (patch) | |
tree | 4c1e109dd78ff581800eb8c16c69135d098a92bb /nuttx/configs/nucleus2g/include | |
parent | 40ddd31247d300d808b047549338107da197cbd7 (diff) |
Add clock initialization logic for the Nucleus2g boad
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@2741 7fd9a85b-ad96-42d3-883c-3090e2eb8679
Diffstat (limited to 'nuttx/configs/nucleus2g/include')
-rwxr-xr-x | nuttx/configs/nucleus2g/include/board.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/nuttx/configs/nucleus2g/include/board.h b/nuttx/configs/nucleus2g/include/board.h index b10b7c4bd0..edbc1bacc1 100755 --- a/nuttx/configs/nucleus2g/include/board.h +++ b/nuttx/configs/nucleus2g/include/board.h @@ -48,9 +48,78 @@ ************************************************************************************/ /* Clocking *************************************************************************/ +/* NOTE: The following definitions require lpc17_syscon.h. It is not included here + * because the including C file may not have that file in its include path. + */ + +#define BOARD_XTAL_FREQUENCY (12000000) /* XTAL oscillator frequency */ +#define BOARD_OSCCLK_FREQUENCY BOARD_XTAL_FREQUENCY /* Main oscillator frequency */ +#define BOARD_RTCCLK_FREQUENCY (32000) /* RTC oscillator frequency */ +#define BOARD_INTRCOSC_FREQUENCY (4000000) /* Internal RC oscillator frequency */ + +/* This is the clock setup we configure for: + * + * SYSCLK = BOARD_OSCCLK_FREQUENCY = 12MHz -> Select Main oscillator for source + * PLL0CLK = (2 * 20 * SYSCLK) / 1 = 480MHz -> PLL0 multipler=20, pre-divider=1 + * CCLCK = 480MHz / 6 = 80MHz -> CCLK divider = 6 + */ #define LPC17_CCLK 80000000 /* 80Mhz*/ +/* Select the main oscillator as the frequency source. SYSCLK is then the frequency + * of the main osciallator. + */ + +#undef CONFIG_LPC17_MAINOSC +#define CONFIG_LPC17_MAINOSC 1 +#define BOARD_SCS_VALUE SYSCON_SCS_OSCEN + +/* Select the main oscillator and CCLK divider. The output of the divider is CCLK. + * The input to the divider (PLLCLK) will be determined by the PLL output. + */ + +#define BOARD_CCLKCFG_DIVIDER 6 +#define BOARD_CCLKCFG_VALUE ((BOARD_CCLKCFG_DIVIDER-1) << SYSCON_CCLKCFG_SHIFT) + +/* PLL0. PLL0 is used to generate the CPU clock divider input (PLLCLK). + * + * Source clock: Main oscillator + * PLL0 Multiplier value (M): 20 + * PLL0 Pre-divider value (N): 1 + */ + +#undef CONFIG_LPC17_PLL0 +#define CONFIG_LPC17_PLL0 1 +#define BOARD_CLKSRCSEL_VALUE SYSCON_CLKSRCSEL_MAIN + +#define BOARD_PLL0CFG_MSEL 20 +#define BOARD_PLL0CFG_NSEL 1 +#define BOARD_PLL0CFG_VALUE \ + (((BOARD_PLL0CFG_MSEL-1) << SYSCON_PLL0CFG_MSEL_SHIFT) | \ + ((BOARD_PLL0CFG_NSEL-1) << SYSCON_PLL0CFG_NSEL_SHIFT)) + +/* PLL1 -- Not used. */ + +#undef CONFIG_LPC17_PLL0 +#define BOARD_PLL1CFG_MSEL 36 +#define BOARD_PLL1CFG_NSEL 1 +#define BOARD_PLL1CFG_VALUE \ + (((BOARD_PLL1CFG_MSEL-1) << SYSCON_PLL1CFG_MSEL_SHIFT) | \ + ((BOARD_PLL1CFG_NSEL-1) << SYSCON_PLL1CFG_NSEL_SHIFT)) + +/* USB divider. This divder is used when PLL1 is not enabled to get the USB clock + * from PLL0: + * + * USBCLK = PLL0CLK / 10 = 48MHz + */ + +#define BOARD_USBCLKCFG_VALUE SYSCON_USBCLKCFG_DIV10 + +/* FLASH Configuration */ + +#undef CONFIG_LP17_FLASH +#define CONFIG_LP17_FLASH 1 +#define BOARD_FLASHCFG_VALUE 0x0000303a /* LED definitions ******************************************************************/ |