avr: more work on uart_hw.

avr/modules/uart_hw/lowlevel.asm

@@ -8,19 +8,49 @@
 ; ***************************************************************************
 
 
-
 .cseg
 
 
 
 ; ---------------------------------------------------------------------------
-; @routine UART_HW_InitInterface @global
+; @routine UART_HW_Init @global
+;
+; Initializes buffers.
+;
+; @clobbers R16, R17, X, Y
+
+UART_HW_Init:
+  ldi xh, HIGH(uartHwDataBegin)
+  ldi xl, LOW(uartHwDataBegin)
+  clr r16
+  ldi r17, (uartHwDataEnd-uartHwDataBegin)
+  rcall Utils_FillSram
+
+  rcall UART_HW_FixedBuffers_Init
+  
+  ldi r16, UART_HW_MSGNUMINBUF_SIZE
+  ldi yl, LOW(uartHw_ringBufferMsgNumIn)
+  ldi yh, HIGH(uartHw_ringBufferMsgNumIn)
+  rcall RingBufferY_Init
+
+  ldi r16, UART_HW_MSGNUMOUTBUF_SIZE
+  ldi yl, LOW(uartHw_ringBufferMsgNumOut)
+  ldi yh, HIGH(uartHw_ringBufferMsgNumOut)
+  rcall RingBufferY_Init
+  
+  sec
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UART_HW_InterfaceInit @global
 ;
 ; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_STATE)
-; @param Z pointer to IFACE jump table for the given interface
 ; @clobbers R16, R17, X
 
-UART_HW_InitInterface:
+UART_HW_InterfaceInit:
   mov xl, yl
   mov xh, yh
   ldi r17, UART_HW_IFACE_SIZE
@@ -38,14 +68,49 @@ UART_HW_InitInterface:
                        UART_HW_IFACE_OFFS_MSGIDBUF_DATA
   ldi r16, 0xff
   std Y+UART_HW_IFACE_OFFS_READBUFFERNUM, r16
+  std Y+UART_HW_IFACE_OFFS_WRITEBUFFERNUM, r16
   ret
 ; @end
 
 
 
+; ---------------------------------------------------------------------------
+; @routine UART_HW_InterfaceAddReadByte
+;
+; @return CFLAG on success, cleared on error
+; @param r16 byte to write
+; @param Y pointer to start of interface data
+; @clobbers R17, R18, X
+
+UART_HW_InterfaceAddReadByte:
+  push yl
+    push yh
+      adiw yh:yl, UART_HW_IFACE_OFFS_RINGBUF_MAX
+      rcall RingBufferY_WriteByte                  ; R17, R18, X
+    pop yh
+  pop yl
+  ret
+; @end
 
 
 
+; ---------------------------------------------------------------------------
+; @routine UART_HW_InterfaceGetNextReadByte
+;
+; @return CFLAG on success, cleared on error
+; @return R16 byte read
+; @param Y pointer to start of interface data
+; @clobbers R17, R18, X
+
+UART_HW_InterfaceGetNextReadByte:
+  push yl
+    push yh
+      adiw yh:yl, UART_HW_IFACE_OFFS_RINGBUF_MAX
+      rcall RingBufferY_ReadByte                  ; R17, R18, X
+    pop yh
+  pop yl
+  ret
+; @end