From f2022a264125bdf3b18e5fe0fe0c2e523cf41ded Mon Sep 17 00:00:00 2001 From: gdisirio Date: Tue, 20 May 2008 14:24:51 +0000 Subject: git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@302 35acf78f-673a-0410-8e92-d51de3d6d3f4 --- demos/ARM7-AT91SAM7X-WEB-GCC/board.c | 159 +++++++++++++++++++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 demos/ARM7-AT91SAM7X-WEB-GCC/board.c (limited to 'demos/ARM7-AT91SAM7X-WEB-GCC/board.c') diff --git a/demos/ARM7-AT91SAM7X-WEB-GCC/board.c b/demos/ARM7-AT91SAM7X-WEB-GCC/board.c new file mode 100644 index 000000000..2bc9c6395 --- /dev/null +++ b/demos/ARM7-AT91SAM7X-WEB-GCC/board.c @@ -0,0 +1,159 @@ +/* + ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio. + + This file is part of ChibiOS/RT. + + ChibiOS/RT 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 3 of the License, or + (at your option) any later version. + + ChibiOS/RT 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, see . +*/ + +#include + +#include "board.h" +#include "at91lib/aic.h" + +#include +#include + +extern void FiqHandler(void); + +__attribute__((naked)) +static void SpuriousHandler(void) { + + chSysIRQEnterI(); + + AT91C_BASE_AIC->AIC_EOICR = 0; + + chSysIRQExitI(); +} + +/* + * SYS IRQ handling here. + */ +__attribute__((naked)) +static void SYSIrqHandler(void) { + + chSysIRQEnterI(); + + if (AT91C_BASE_PITC->PITC_PISR & AT91C_PITC_PITS) { + (void) AT91C_BASE_PITC->PITC_PIVR; + chSysTimerHandlerI(); + } + AT91C_BASE_AIC->AIC_EOICR = 0; \ + + chSysIRQExitI(); +} + +/* + * Board initialization code. + */ +void hwinit(void) { + int i; + + /* + * Flash Memory: 1 wait state, about 50 cycles in a microsecond. + */ + AT91C_BASE_MC->MC_FMR = (AT91C_MC_FMCN & (50 << 16)) | AT91C_MC_FWS_1FWS; + + /* + * Watchdog disabled. + */ + AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS; + + /* + * Enables the main oscillator and waits 56 slow cycles as startup time. + */ + AT91C_BASE_PMC->PMC_MOR = (AT91C_CKGR_OSCOUNT & (7 << 8)) | AT91C_CKGR_MOSCEN; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS)) + ; + + /* + * PLL setup: DIV = 14, MUL = 72, PLLCOUNT = 10 + * PLLfreq = 96109714 Hz (rounded) + */ + AT91C_BASE_PMC->PMC_PLLR = (AT91C_CKGR_DIV & 14) | + (AT91C_CKGR_PLLCOUNT & (10 << 8)) | + (AT91C_CKGR_MUL & (72 << 16)); + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK)) + ; + + /* + * Master clock = PLLfreq / 2 = 48054858 Hz (rounded) + */ + AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_PLL_CLK | AT91C_PMC_PRES_CLK_2; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY)) + ; + + /* + * I/O setup, enable clocks, initially all pins are inputs with pullups. + */ + AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_PIOA) | (1 << AT91C_ID_PIOB); + AT91C_BASE_PIOA->PIO_PER = 0xFFFFFFFF; + AT91C_BASE_PIOB->PIO_PER = 0xFFFFFFFF; + + /* + * Default AIC setup, the device drivers will modify it as needed. + */ + AT91C_BASE_AIC->AIC_ICCR = 0xFFFFFFFF; + AT91C_BASE_AIC->AIC_SVR[0] = (AT91_REG)FiqHandler; + for (i = 1; i < 31; i++) { + AT91C_BASE_AIC->AIC_SVR[i] = (AT91_REG)NULL; + AT91C_BASE_AIC->AIC_EOICR = (AT91_REG)i; + } + AT91C_BASE_AIC->AIC_SPU = (AT91_REG)SpuriousHandler; + + /* + * LCD pins setup. + */ + AT91C_BASE_PIOB->PIO_CODR = PIOB_LCD_BL; // Set to low. + AT91C_BASE_PIOB->PIO_OER = PIOB_LCD_BL; // Configure as output. + AT91C_BASE_PIOB->PIO_PPUDR = PIOB_LCD_BL; // Disable internal pullup resistor. + + AT91C_BASE_PIOA->PIO_SODR = PIOA_LCD_RESET; // Set to high. + AT91C_BASE_PIOA->PIO_OER = PIOA_LCD_RESET; // Configure as output. + AT91C_BASE_PIOA->PIO_PPUDR = PIOA_LCD_RESET; // Disable internal pullup resistor. + + /* + * Joystick and buttons, disable pullups, already inputs. + */ + AT91C_BASE_PIOA->PIO_PPUDR = PIOA_B1 | PIOA_B2 | PIOA_B3 | PIOA_B4 | PIOA_B5; + AT91C_BASE_PIOB->PIO_PPUDR = PIOB_SW1 | PIOB_SW2; + + /* + * MMC/SD slot, disable pullups, already inputs. + */ + AT91C_BASE_SYS->PIOB_PPUDR = PIOB_MMC_WP | PIOB_MMC_CP; + + /* + * PIT Initialization. + */ + AIC_ConfigureIT(AT91C_ID_SYS, + AT91C_AIC_SRCTYPE_HIGH_LEVEL | (AT91C_AIC_PRIOR_HIGHEST - 1), + SYSIrqHandler); + AIC_EnableIT(AT91C_ID_SYS); + AT91C_BASE_PITC->PITC_PIMR = (MCK / 16 / CH_FREQUENCY) - 1; + AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN | AT91C_PITC_PITIEN; + + /* + * Serial driver initialization, RTS/CTS pins enabled for USART0 only. + */ + InitSerial(AT91C_AIC_PRIOR_HIGHEST - 2, AT91C_AIC_PRIOR_HIGHEST - 2); + AT91C_BASE_PIOA->PIO_PDR = AT91C_PA3_RTS0 | AT91C_PA4_CTS0; + AT91C_BASE_PIOA->PIO_ASR = AT91C_PIO_PA3 | AT91C_PIO_PA4; + AT91C_BASE_PIOA->PIO_PPUDR = AT91C_PIO_PA3 | AT91C_PIO_PA4; + + /* + * EMAC driver initialization. + */ + InitEMAC(AT91C_AIC_PRIOR_HIGHEST - 3); +} -- cgit v1.2.3