diff options
Diffstat (limited to 'nuttx/configs/olimex-lpc2378/include/board.h')
| -rw-r--r-- | nuttx/configs/olimex-lpc2378/include/board.h | 57 |
1 files changed, 26 insertions, 31 deletions
diff --git a/nuttx/configs/olimex-lpc2378/include/board.h b/nuttx/configs/olimex-lpc2378/include/board.h index 44919c46c..dc6770a8c 100644 --- a/nuttx/configs/olimex-lpc2378/include/board.h +++ b/nuttx/configs/olimex-lpc2378/include/board.h @@ -6,7 +6,7 @@ * * This is part of the NuttX RTOS and based on the LPC2148 port: * - * Copyright (C) 2010 Gregory Nutt. All rights reserved. + * Copyright (C) 2010, 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without @@ -38,35 +38,34 @@ * ****************************************************************************/ -#ifndef __ARCH_BOARD_BOARD_H -#define __ARCH_BOARD_BOARD_H +#ifndef __CONFIGS_OLIMEX_LPC2378_INCLUDE_BOARD_H +#define __CONFIGS_OLIMEX_LPC2378_INCLUDE_BOARD_H -#ifdef __cplusplus - extern "C" { -#endif +/************************************************************************************ + * Pre-processor Definitions + ************************************************************************************/ -/* If USB is enabled, PLL must be configured for 48MHz to provide USB clocking */ -//-- F_pll = (2 * M * F_in)/N -//-- F_out = ((2 * (PLL_M + 1 ) * FOSC)/(0+1))/(CCLK_DIV+1) = 288/5 = 57 600 000 Hz -//~ #ifdef CONFIG_USBDEV - //~ # define FOSC (12000000) /* Oscillator frequency */ - //~ # define CCLK (57600000) /* CPU running clock */ - //~ # define FCCO (288000000) /* CPU CCO clock */ -//~ #else - # define FOSC (12000000) /* Oscillator frequency */ - # define CCLK (57600000) /* CPU running clock */ - # define FCCO (288000000) /* CPU CCO clock */ - //~ # define CCLK (72000000) /* CPU running clock */ - //~ # define FCCO (360000000) /* CPU CCO clock */ -//~ #endif +/* If USB is enabled, PLL must be configured for 48MHz to provide USB + * clocking. + * + * F_pll = (2 * M * F_in) / N + * F_out = ((2 * (PLL_M + 1) * FOSC)/(PLL_N + 1))/(CCLK_DIV + 1) + * + * With PLL_M=11, PLL_N=0, CCLK_DIV=4: + * + * F_out = ((2 * (11 + 1) * 12000000)/(0 + 1))/(4 + 1) + * = 288,000,000 / 5 = 57,600,000 Hz + */ -//~#define PLL_M ( (FCCO / (2 * FOSC))-1 ) -//~ #define PLL_N ( ((2 * PLL_M * FOSC) / FCCO)-1 ) -#define PLL_M 11 -#define PLL_N 0 +#define FOSC (12000000) /* Oscillator frequency */ +#define FCCO (288000000) /* CPU CCO clock */ +#define CCLK (57600000) /* CPU running clock */ -#define CCLK_DIV 4 -#define USBCLK_DIV 6 +#define PLL_M 11 +#define PLL_N 0 + +#define CCLK_DIV 4 +#define USBCLK_DIV 6 /* LED definitions **********************************************************/ @@ -79,12 +78,8 @@ #define LED_ASSERTION 6 #define LED_PANIC 7 -#ifdef __cplusplus - } -#endif - /**************************************************************************** * Inline Functions ****************************************************************************/ -#endif /* __ARCH_BOARD_BOARD_H */ +#endif /* __CONFIGS_OLIMEX_LPC2378_INCLUDE_BOARD_H */ |