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;
+}
+