Make it possible to subscribe to DMA events.

platform/msb430/dev/dma.c

@@ -42,22 +42,26 @@
 
 #include "contiki-msb430.h"
 #include "dev/cc1020.h"
+#include "dev/dma.h"
+
+static struct process *subscribers[DMA_LINES];
+process_event_t dma_event;
 
 interrupt(DACDMA_VECTOR) irq_dacdma(void)
 {
-  static unsigned char line;
-
   if (DMA0CTL & DMAIFG) {
     DMA0CTL &= ~(DMAIFG | DMAIE);
-    line = 0;
+    if (subscribers[0] != NULL) {
-    process_post(&cc1020_sender_process, cc1020_event, &line);
+      process_post(subscribers[0], dma_event, NULL);
+    }
     LPM_AWAKE();
   }
 
   if (DMA1CTL & DMAIFG) {
     DMA1CTL &= ~(DMAIFG | DMAIE);
-    line = 1;
+    if (subscribers[1] != NULL) {
-    process_post(&cc1020_sender_process, cc1020_event, &line);
+      process_post(subscribers[1], dma_event, NULL);
+    }
     LPM_AWAKE();
   }
 
@@ -70,6 +74,21 @@ interrupt(DACDMA_VECTOR) irq_dacdma(void)
   }
 }
 
+void
+dma_init(void)
+{
+  dma_event = process_alloc_event();
+}
+
+int
+dma_subscribe(int line, struct process *p)
+{
+  if (line >= DMA_LINES)
+    return -1;
+
+  subscribers[line] = p;
+}
+
 void
 dma_transfer(unsigned char *buf, unsigned len)
 {

platform/msb430/dev/dma.h

@@ -28,12 +28,18 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: dma.h,v 1.3 2007/07/05 08:35:13 nvt-se Exp $
+ * $Id: dma.h,v 1.4 2007/08/16 13:51:57 nvt-se Exp $
  */
 
 #ifndef DMA_H
 #define DMA_H
 
+#define DMA_LINES	2
+
+void dma_init(void);
+int dma_subscribe(int, struct process *);
 void dma_transfer(unsigned char *, unsigned);
 
+extern process_event_t dma_event;
+
 #endif