Merge pull request #13 from anarkiwi/reu

initial reu support.

vap.c

@@ -54,6 +54,8 @@ enum ASID_CMD {
  ASID_CMD_FILL_RECT_BUFFER,
  ASID_CMD_COPY_BUFFER,
  ASID_CMD_COPY_RECT_BUFFER,
+ ASID_CMD_REU_STASH_BUFFER,
+ ASID_CMD_REU_FETCH_BUFFER,
 };
 
 enum EXPECTED_DATA {
@@ -220,6 +222,12 @@ void init(void) {
  case ASID_CMD_COPY_RECT_BUFFER: \
  HANDLE_COPY_RECT_BUFFER; \
  break; \
+ case ASID_CMD_REU_STASH_BUFFER: \
+ *REU_COMMAND = 0b10010000; \
+ break; \
+ case ASID_CMD_REU_FETCH_BUFFER: \
+ *REU_COMMAND = 0b10010001; \
+ break; \
  case ASID_CMD_START: \
  initsid(); \
  break; \
@@ -295,6 +303,11 @@ void init(void) {
 
 #define HANDLE_COPY_RECT_BUFFER HANDLE_COPY_BUFFER(RECT_INIT, RECT_SKIP)
 
+#define REU_COMMAND ((unsigned char *)0xdf01)
+#define REU_HOST_BASE ((unsigned char *)0xdf02)
+#define REU_ADDR_BASE ((unsigned char *)0xdf04)
+#define REU_CONTROL ((unsigned char *)0xdf0a)
+
 #define HANDLE_MIDI_DATA \
  switch (expected_data) { \
  case DATA_LOAD: \
@@ -332,17 +345,19 @@ void init(void) {
  loadbuffer = (unsigned char *)&rectconfig; \
  break; \
  case ASID_CMD_FILL_BUFFER: \
- loadbuffer = (unsigned char *)&fillconfig; \
- break; \
  case ASID_CMD_FILL_RECT_BUFFER: \
  loadbuffer = (unsigned char *)&fillconfig; \
  break; \
  case ASID_CMD_COPY_BUFFER: \
- loadbuffer = (unsigned char *)&copyconfig; \
- break; \
  case ASID_CMD_COPY_RECT_BUFFER: \
  loadbuffer = (unsigned char *)&copyconfig; \
  break; \
+ case ASID_CMD_REU_STASH_BUFFER: \
+ case ASID_CMD_REU_FETCH_BUFFER: \
+ loadbuffer = REU_ADDR_BASE; \
+ *REU_CONTROL = 0; \
+ *(uint16_t *)REU_HOST_BASE = (uint16_t)bufferaddr; \
+ break; \
  default: \
  expected_data = DATA_ANY; \
  } \