polio: fix comms

src/paracomm.c

@@ -22,6 +22,7 @@ static uint8_t miso_recvbuf[256];
 static uint8_t miso_size;
 static uint8_t miso_received_nibbles;
 static uint8_t miso_state;
+recv_cb miso_recv_cb;
 
 static void swapbuffers() {
     mosi_sendbuf = mosi_workbuf[mosi_workbuf_idx];
@@ -92,19 +93,21 @@ void paracomm_feed(uint8_t n) {
         miso_received_nibbles += 1;
 
         if (miso_received_nibbles == 2 * miso_size) {
+            miso_recv_cb(miso_recvbuf, miso_size);
             miso_state = 0;
         }
     } break;
     }
 }
 
-void paracomm_init() {
+void paracomm_init(recv_cb miso_cb) {
     mosi_size = 0;
     mosi_workbuf_idx = 0;
     mosi_workbuf_size = 0;
     mosi_state = 0;
 
     miso_state = 0;
+    miso_recv_cb = miso_cb;
 }
 
 int paracomm_send(uint8_t b) {
@@ -119,20 +122,6 @@ int paracomm_send(uint8_t b) {
     return 0;
 }
 
-uint8_t paracomm_recv(uint8_t* buf, uint8_t size) {
-    if (miso_state != 0) {
-        return 0;
-    }
-    if (size > miso_size) {
-        size = miso_size;
-    }
-    memcpy(buf, miso_recvbuf, size);
-    memcpy(miso_recvbuf, miso_recvbuf+size, miso_size - size);
-    miso_size -= size;
-
-    return size;
-}
-
 uint8_t paracomm_busy() {
     return mosi_state != 0 || miso_state != 0;
 }