/************************************************************************** * up_internal.h * * Copyright (C) 2007 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name Gregory Nutt nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * **************************************************************************/ #ifndef __ARCH_UP_INTERNAL_H #define __ARCH_UP_INTERNAL_H /************************************************************************** * Included Files **************************************************************************/ /************************************************************************** * Public Definitions **************************************************************************/ /* Memory Map * * BEGIN END DESCRIPTION * 0x0000 0x1fff CODE: ROM containg PAULMON2 * DATA: RAM for program variables * 0x2000 0x7fff COMMON: RAM for program code or * variables * 0x8000 0xf7ff COMMON: FLASH for program code * 0xf800 0xfeff COMMON: Peripherals * 0xff00 0xffff COMMON: unused * * Program code may be loaded at the RAM location 0x2000-0x7fff * for testing. If loaded into the FLASH location at * 0x8000-0xf7ff, PAULMON2 will automatically write the program * into flash. The program is configured in the RAM-based test * configuration: */ #define RAM_BLOCK_START IRAM_SIZE #define RAM_BLOCK_END 0x1fff #define PROGRAM_BASE 0x2000 #define PROGRAM_END 0x7fff #define FLASH_BASE 0x8000 #define FLASH_END 0xf7ff /* Well-known entry points to access PAULMON2's built-in functions */ #define PM2_ENTRY_PHEX1 0x002e #define PM2_ENTRY_COUT 0x0030 #define PM2_ENTRY_CIN 0x0032 #define PM2_ENTRY_PHEX 0x0034 #define PM2_ENTRY_PHEX16 0x0036 #define PM2_ENTRY_PSTR 0x0038 #define PM2_ENTRY_ESC 0x003e #define PM2_ENTRY_UPPER 0x0040 #define PM2_ENTRY_PINT8U 0x004D #define PM2_ENTRY_PINT8 0x0050 #define PM2_ENTRY_PINT16U 0x0053 #define PM2_ENTRY_NEWLINE 0x0048 #define PM2_ENTRY_PRGM 0x0059 #define PM2_ENTRY_ERBLOCK 0x0067 #define PM2_VECTOR_BASE PROGRAM_BASE #define PM2_VECTOR_EXTINT0 (PM2_VECTOR_BASE + 3) #define PM2_VECTOR_TIMER0 (PM2_VECTOR_BASE + 11) #define PM2_VECTOR_EXTINT1 (PM2_VECTOR_BASE + 19) #define PM2_VECTOR_TIMER1 (PM2_VECTOR_BASE + 27) #define PM2_VECTOR_UART (PM2_VECTOR_BASE + 35) #define PM2_VECTOR_TIMER2 (PM2_VECTOR_BASE + 43) /* Registers. 8052 regiser definitions are provided in the SDCC header * file 8052.h. However, a few SFR registers are missing from that * file (they can be found in mcs51reg.h, but that file is too much * when the following simple addtions do the job). */ sfr at 0xc9 T2MOD ; /* Timing information. * * The PJRC board is based on a standard 87C52 CPU clocked at 22.1184 MHz. * The CPU clock is divided by 12 to yield a clock frequency of 1.8432 MHz. */ #define CPU_CLOCK_HZ 22118400L #define TIMER_CLOCK_HZ 1843200L /* The 87C52 has three timers, timer 0, timer 1, and timer 2. On the PJRC * board, timer 1 and 2 have dedicated functions. They provide baud support * support for the boards two serial ports. Unfortunately, only timer 2 * can generate the accurate 100Hz timer desired by the OS. * * Timer 0 provides only a 8-bit auto-reload mode. */ #define CONFIG_80C52_TIMER2 1 #ifdef CONFIG_80C52_TIMER2 /* To use timer 2 as the 100Hz system timer, we need to calculate a 16-bit * reload value that results in 100Hz overflow interrupts. That value * is given by: * * Timer ticks = TIMER_CLOCK_HZ / (desired ticks-per-second) * = 18432 * Capture value = 0xffff - (Timer ticks) * = 47103 = 0x67ff */ # define TIMER2_CAPTURE_LOW 0xff # define TIMER2_CAPTURE_HIGH 0x67 #else /* Timer 0, mode 0 can be used as a system timer. In that mode, the * 1.8432 is further divided by 32. A single 8-bit value is incremented * at 57600 Hz, which results in 225 Timer 0 overflow interrupts per * second. */ # warning "No support for timer 0 as the system timer" #endif /************************************************************************** * Public Types **************************************************************************/ /************************************************************************** * Public Variables **************************************************************************/ #ifndef __ASSEMBLY__ /* This is the top of the stack containing the interrupt stack frame. It * is set when processing an interrupt. It is also cleared when the * interrupt returns so this can also be used like a boolean indication that * we are in an interrupt. */ extern ubyte g_irqtos; #endif /* __ASSEMBLY */ /************************************************************************** * Public Function Prototypes **************************************************************************/ #ifndef __ASSEMBLY__ extern void up_irqinitialize(void); extern void up_restorecontext(FAR struct xcptcontext *context); extern void up_restorestack(FAR struct xcptcontext *context); extern ubyte up_savecontext(FAR struct xcptcontext *context); extern void up_savestack(FAR struct xcptcontext *context); extern void up_timerinit(void); #endif /* __ASSEMBLY */ #endif /* __ARCH_UP_INTERNAL_H */