Satellite Observers Workbench. NOT yet complete, just published for forum posters to \"cherry pick\" pieces of code as requiered as an example.
Diff: flash/ssp0.c
- Revision:
- 0:0a841b89d614
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flash/ssp0.c Mon Oct 11 10:34:55 2010 +0000 @@ -0,0 +1,124 @@ +/**************************************************************************** + * Copyright 2010 Andy Kirkham, Stellar Technologies Ltd + * + * This file is part of the Satellite Observers Workbench (SOWB). + * + * SOWB 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. + * + * SOWB 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 SOWB. If not, see <http://www.gnu.org/licenses/>. + * + * $Id: main.cpp 5 2010-07-12 20:51:11Z ajk $ + * + ***************************************************************************/ + +#include "sowb.h" +#include "debug.h" +#include "ssp0.h" + +bool ssp0_in_use; + +bool SSP0_request(void) { + if (!ssp0_in_use) { + ssp0_in_use = true; + return true; + } + return false; +} + +void SSP0_release(void) { + ssp0_in_use = false; +} + +/* Declare ISR callbacks. */ +extern int flash_read_ssp0_irq(void); +extern int flash_write_ssp0_irq(void); + +/* Function pointer type for the following table. */ +typedef int (*SSP0_callback)(void); + +/* Define an array of callbacks to make. */ +const SSP0_callback ssp0_callbacks[] = { + flash_read_ssp0_irq, + flash_write_ssp0_irq, + NULL +}; + +/** SSP0_IRQHandler + */ +extern "C" void SSP0_IRQHandler(void) __irq { + for (int i = 0; ssp0_callbacks[i] != NULL; i++) { + if ((ssp0_callbacks[i])() != 0) { + break; + } + } +} + +/** SSP0_init + */ +void SSP0_init(void) { + + DEBUG_INIT_START; + + ssp0_in_use = false; + + /* The flash device is connected to SSP1 via the Mbed pins. + So this init is about configuring just the SSP1. */ + + /* Enable the SSP1 peripheral. */ + //LPC_SC->PCONP |= (1UL << 10); + LPC_SC->PCONP |= (1UL << 21); + + /* Select the clock required for SSP1. */ + LPC_SC->PCLKSEL1 &= ~(3UL << 10); + LPC_SC->PCLKSEL1 |= (3UL << 10); + //LPC_SC->PCLKSEL0 &= ~(3UL << 20); + //LPC_SC->PCLKSEL0 |= (3UL << 20); + + /* Select the GPIO pins for the SSP0 functions. */ + /* SCK0 */ + LPC_PINCON->PINSEL0 &= ~(3UL << 30); + LPC_PINCON->PINSEL0 |= (2UL << 30); + /* MISO0 */ + LPC_PINCON->PINSEL1 &= ~(3UL << 2); + LPC_PINCON->PINSEL1 |= (2UL << 2); + /* MISI0 */ + LPC_PINCON->PINSEL1 &= ~(3UL << 4); + LPC_PINCON->PINSEL1 |= (2UL << 4); + + /* Select the GPIO pins for the SSP1 functions. */ + /* SCK1 */ + //LPC_PINCON->PINSEL0 &= ~(3UL << 14); + //LPC_PINCON->PINSEL0 |= (2UL << 14); + /* MISO1 */ + //LPC_PINCON->PINSEL0 &= ~(3UL << 16); + //LPC_PINCON->PINSEL0 |= (2UL << 16); + /* MOSI1 */ + //LPC_PINCON->PINSEL0 &= ~(3UL << 18); + //LPC_PINCON->PINSEL0 |= (2UL << 18); + + /* Note, we don't use SSEL1 in our design, we just use a standard GPIO + because writing multi-byte data is simpler. */ + + /* Setup the interrupt system. Note however, the SSP1 interrupt + is only actually activated within the DMA ISR and is self disabling. */ + NVIC_SetVector(SSP0_IRQn, (uint32_t)SSP0_IRQHandler); + NVIC_EnableIRQ(SSP0_IRQn); + + /* Setup the control registers for SSP1 */ + LPC_SSP0->IMSC = 0; + LPC_SSP0->CR0 = 0x7; + LPC_SSP0->CPSR = FLASH_SSP_INIT_CPSR; + LPC_SSP0->CR1 = 0x2; + + DEBUG_INIT_END; +} +