基地址定义： LPC3250外设众多，无法将全部的寄存器做成一个头文件，或者列出全部的寄存器和地址。 移植代码将每个外围部件的基地址做成一个文件platform.h，然后为每个外设再编写单独的外设寄存器列表（偏移量），如lpc32xx_gpio.h等等。 platform.h文件内容如下： /* * asm-arm/arch-lpc32xx/platform.h * * Author: Kevin Wells * * Copyright (C) 2008 NXP Semiconductors * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __LPC32XX_PLATFORM_H__ #define __LPC32XX_PLATFORM_H__ #include /* * AHB 0 physical base addresses */ #define SLC_BASE 0x20020000 #define SSP0_BASE 0x20084000 #define SPI1_BASE 0x20088000 #define SSP1_BASE 0x2008C000 #define SPI2_BASE 0x20090000 #define I2S0_BASE 0x20094000 #define SD_BASE 0x20098000 #define I2S1_BASE 0x2009C000 #define MLC_BASE 0x200A8000 #define AHB0_START SLC_BASE #define AHB0_SIZE ((MLC_BASE - SLC_BASE) + SZ_4K) /* * AHB 1 physical base addresses */ #define DMA_BASE 0x31000000 #define USB_BASE 0x31020000 #define USBH_BASE 0x31020000 #define USB_OTG_BASE 0x31020000 #define OTG_I2C_BASE 0x31020300 #define LCD_BASE 0x31040000 #define ETHERNET_BASE 0x31060000 #define EMC_BASE 0x31080000 #define ETB_CFG_BASE 0x310C0000 #define ETB_DATA_BASE 0x310E0000 #define AHB1_START DMA_BASE #define AHB1_SIZE ((EMC_BASE - DMA_BASE) + SZ_4K) /* * FAB physical base addresses */ #define CLK_PM_BASE 0x40004000 #define MIC_BASE 0x40008000 #define SIC1_BASE 0x4000C000 #define SIC2_BASE 0x40010000 #define HS_UART1_BASE 0x40014000 #define HS_UART2_BASE 0x40018000 #define HS_UART7_BASE 0x4001C000 #define RTC_BASE 0x40024000 #define RTC_RAM_BASE 0x40024080 #define GPIO_BASE 0x40028000 #define PWM3_BASE 0x4002C000 #define PWM4_BASE 0x40030000 #define MSTIM_BASE 0x40034000 #define HSTIM_BASE 0x40038000 #define WDTIM_BASE 0x4003C000 #define DEBUG_CTRL_BASE 0x40040000 #define TIMER0_BASE 0x40044000 #define ADC_BASE 0x40048000 #define TIMER1_BASE 0x4004C000 #define KSCAN_BASE 0x40050000 #define UART_CTRL_BASE 0x40054000 #define TIMER2_BASE 0x40058000 #define PWM1_BASE 0x4005C000 #define PWM2_BASE 0x4005C004 #define TIMER3_BASE 0x40060000 /* * APB physical base addresses */ #define UART3_BASE 0x40080000 #define UART4_BASE 0x40088000 #define UART5_BASE 0x40090000 #define UART6_BASE 0x40098000 #define I2C1_BASE 0x400A0000 #define I2C2_BASE 0x400A8000 /* FAB and APB base and sizing */ #define FABAPB_START CLK_PM_BASE #define FABAPB_SIZE ((I2C2_BASE - CLK_PM_BASE) + SZ_4K) /* * Internal memory Bases */ #define IRAM_BASE 0x08000000 #define IROM_BASE 0x0C000000 /* * External Static Memory Bank Address Space Bases */ #define EMC_CS0_BASE 0xE0000000 #define EMC_CS1_BASE 0xE1000000 #define EMC_CS2_BASE 0xE2000000 #define EMC_CS3_BASE 0xE3000000 /* * External SDRAM Memory Bank Address Space Bases */ #define EMC_DYCS0_BASE 0x80000000 #define EMC_DYCS1_BASE 0xA0000000 /* * Clock and crystal information */ #define MAIN_OSC_FREQ 13000000 #define CLOCK_OSC_FREQ 32768 #endif 寄存器操作示例： 首先定义各个外设寄存器的偏移地址： #define GPIO_P3_INP_STATE(x) (x + 0x000) #define GPIO_P3_OUTP_SET(x) (x + 0x004) #define GPIO_P3_OUTP_CLR(x) (x + 0x008) #define GPIO_P3_OUTP_STATE(x) (x + 0x00C) #define GPIO_P3_MUX_SET(x) (x + 0x110) #define GPIO_P3_MUX_CLR(x) (x + 0x114) #define GPIO_P3_MUX_STATE(x) (x + 0x118) 然后通过io_p2v将各基地址的物理地址转换成虚拟地址： #define TIMER0_IOBASE io_p2v(TIMER0_BASE) #define CLKPWR_IOBASE io_p2v(CLK_PM_BASE) #define GPIO_IOBASE io_p2v(GPIO_BASE) 最后使用__raw_writel或者__raw_readl函数进行操作： __raw_writel(OUTP_STATE_GPO(1), GPIO_P3_OUTP_SET(GPIO_IOBASE)); |