gpio.c

00001 /****************************************************************************
00002  *    Copyright 2010 Andy Kirkham, Stellar Technologies Ltd
00003  *    
00004  *    This file is part of the Satellite Observers Workbench (SOWB).
00005  *
00006  *    SOWB is free software: you can redistribute it and/or modify
00007  *    it under the terms of the GNU General Public License as published by
00008  *    the Free Software Foundation, either version 3 of the License, or
00009  *    (at your option) any later version.
00010  *
00011  *    SOWB is distributed in the hope that it will be useful,
00012  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *    GNU General Public License for more details.
00015  *
00016  *    You should have received a copy of the GNU General Public License
00017  *    along with SOWB.  If not, see <http://www.gnu.org/licenses/>.
00018  *
00019  *    $Id: main.cpp 5 2010-07-12 20:51:11Z ajk $
00020  *    
00021  ***************************************************************************/
00022  
00023  #include "sowb.h"
00024  #include "debug.h"
00025  #include "gpio.h"
00026  
00027  
00028  /** gpio_init
00029   */
00030  void gpio_init(void) {
00031  
00032     DEBUG_INIT_START;
00033     
00034     /* The following code could be condensed into a single set of
00035        and/or statements. However, for code clarity they are laid
00036        out on a "use case" way to see each pin being defined. Since
00037        this is "init" code and only called once at start-up, the
00038        extra overhead isn't worth the effort over cleaner to read
00039        code. */
00040        
00041     /* The MAX7456 module uses p0.23 (p15) for it's chip select
00042        output. Define it's setup here and use the macros in gpio.h
00043        to assert, deassert or read the pin. */
00044     //LPC_PINCON->PINSEL1 &= ~(3UL << 14);  /* Function GPIO. */
00045     //LPC_GPIO0->FIODIR   |=  (1UL << 23);  /* P0.23 as output. */
00046     
00047     /* The MAX7456 module uses p0.16 (p14) for it's chip select
00048        output. Define it's setup here and use the macros in gpio.h
00049        to assert, deassert or read the pin. */
00050     //LPC_PINCON->PINSEL1 &= ~(3UL << 14);  /* Function GPIO. */
00051     //LPC_GPIO0->FIODIR   |=  (1UL << 16);  /* P0.23 as output. */
00052 
00053     /* The MAX7456 module uses p0.6 (p8) for it's chip select
00054        output. Define it's setup here and use the macros in gpio.h
00055        to assert, deassert or read the pin. */
00056     LPC_PINCON->PINSEL0 &= ~(3UL << 12);  /* Function GPIO. */
00057     LPC_GPIO0->FIODIR   |=  (1UL <<  6);  /* P0.6 as output. */       
00058 
00059              
00060     /* The MAX7456 module uses p1.31 (p20) for it's reset output.
00061        Define it's setup here and use the macros in gpio.h to assert, 
00062        deassert or read the pin. */
00063     LPC_PINCON->PINSEL3 &= ~(3UL << 30);  /* Function GPIO. */
00064     LPC_GPIO1->FIODIR   |=  (1UL << 31);  /* P1.31 as output. */
00065     
00066     /* We use p0.25 (p17) for the SD Card detect. */
00067     LPC_PINCON->PINSEL1 &= ~(3UL << 18);  /* Function GPIO. */
00068     LPC_GPIO0->FIODIR   &= ~(1UL << 25);  /* P0.25 as Input. */
00069     
00070     /* We use p0.16 (p14) for the Flash device SSP0 CS signal. */
00071     LPC_PINCON->PINSEL1 &= ~(3UL << 14);  /* Function GPIO. */
00072     LPC_GPIO0->FIODIR   |=  (1UL << 16);  /* P0.23 as output. */
00073 
00074     /* We use p0.24 (p16) for the 25AA02E48 device SSP0 CS signal. */
00075     LPC_PINCON->PINSEL1 &= ~(3UL << 14);  /* Function GPIO. */
00076     LPC_GPIO0->FIODIR   |=  (1UL << 24);  /* P0.24 as output. */ 
00077     
00078     /* We use p1.30 (p19) for the MicroSD card device SSP0 CS signal. */
00079     LPC_PINCON->PINSEL3 &= ~(3UL << 28);  /* Function GPIO. */
00080     LPC_GPIO1->FIODIR   |=  (1UL << 30);  /* P1.30 as output. */    
00081     
00082     /* We use p2.5 (p21) for debugging. */
00083     LPC_PINCON->PINSEL4 &= ~(3UL << 10);  /* Function GPIO. */
00084     LPC_GPIO2->FIODIR   |=  (1UL << 5);  /* P2.5 as output. */
00085     
00086     /* We use p2.4 (p22) for debugging. */
00087     LPC_PINCON->PINSEL4 &= ~(3UL << 8);  /* Function GPIO. */
00088     LPC_GPIO2->FIODIR   |=  (1UL << 4);  /* P2.4 as output. */
00089     
00090     
00091 #ifdef MBED_LEDS
00092     /* The MBED has four useful little blue LEDs that can be used. 
00093        Mbed examples use the DigitalOut led1(LED1) style. Mimic that
00094        using our system here. Here however, I will use shorthand ;)     
00095                                 LED1           LED2           LED3           LED4     */
00096     LPC_PINCON->PINSEL3 &= ( ~(3UL <<  4) & ~(3UL <<  8) & ~(3UL << 10) & ~(3UL << 14) );  
00097     LPC_GPIO1->FIODIR   |= (  (1UL << 18) |  (1UL << 20) |  (1UL << 21) |  (1UL << 23) );
00098 #endif
00099     
00100     
00101     SSP0_CS_DEASSERT;
00102     FLASH_CS_DEASSERT;
00103     SDCARD_CS_DEASSERT;
00104     AA02E48_CS_DEASSERT;
00105     MAX7456_CS_DEASSERT;
00106     
00107     DEBUG_INIT_END;
00108 }
00109  
00110 /** gpio_process
00111  */
00112 void gpio_process(void) {
00113    /* Does nothing, no house keeping required. */
00114 }
00115