272 lines
6.5 KiB
NASM
272 lines
6.5 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2025 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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.cseg
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; ---------------------------------------------------------------------------
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; @routine UART_HW_Init @global
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;
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; Initializes buffers.
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;
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; @clobbers R16, R17, X, Y
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UART_HW_Init:
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ldi xh, HIGH(uartHwDataBegin)
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ldi xl, LOW(uartHwDataBegin)
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clr r16
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ldi r17, (uartHwDataEnd-uartHwDataBegin)
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rcall Utils_FillSram
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rcall UART_HW_FixedBuffers_Init
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ldi r16, UART_HW_MSGNUMINBUF_SIZE
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ldi yl, LOW(uartHw_ringBufferMsgNumIn)
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ldi yh, HIGH(uartHw_ringBufferMsgNumIn)
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rcall RingBufferY_Init
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ldi r16, UART_HW_MSGNUMOUTBUF_SIZE
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ldi yl, LOW(uartHw_ringBufferMsgNumOut)
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ldi yh, HIGH(uartHw_ringBufferMsgNumOut)
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rcall RingBufferY_Init
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sec
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine UART_HW_InterfaceInit @global
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;
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; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_STATE)
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; @clobbers R16, R17, X
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UART_HW_InterfaceInit:
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mov xl, yl
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mov xh, yh
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ldi r17, UART_HW_IFACE_SIZE
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clr r16
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rcall Utils_FillSram ; (R17, X)
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; reset ringbuffer for recvd chars
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m_ringbuffer_y_reset UART_HW_IFACE_READBUF_SIZE, \
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UART_HW_IFACE_OFFS_READBUF_USED, \
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UART_HW_IFACE_OFFS_READBUF_RDPOS, \
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UART_HW_IFACE_OFFS_READBUF_WRPOS, \
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UART_HW_IFACE_OFFS_READBUF_DATA
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; reset ringbuffer for chars to transmit
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m_ringbuffer_y_reset UART_HW_IFACE_WRITEBUF_SIZE, \
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UART_HW_IFACE_OFFS_WRITEBUF_USED, \
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UART_HW_IFACE_OFFS_WRITEBUF_RDPOS, \
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UART_HW_IFACE_OFFS_WRITEBUF_WRPOS, \
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UART_HW_IFACE_OFFS_WRITEBUF_DATA
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; reset ringbuffer for messages to be sent
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m_ringbuffer_y_reset UART_HW_IFACE_OUTMSGBUF_SIZE, \
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UART_HW_IFACE_OFFS_OUTMSGBUF_USED, \
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UART_HW_IFACE_OFFS_OUTMSGBUF_RDPOS, \
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UART_HW_IFACE_OFFS_OUTMSGBUF_WRPOS, \
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UART_HW_IFACE_OFFS_OUTMSGBUF_DATA
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ldi r16, 0xff
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std Y+UART_HW_IFACE_OFFS_READMSG_BUFNUM, r16
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std Y+UART_HW_IFACE_OFFS_WRITEMSG_BUFNUM, r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine UART_HW_InterfaceWriteToReadBuffer @global
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;
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; @return CFLAG on success, cleared on error
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; @param r16 byte to write
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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UART_HW_InterfaceWriteToReadBuffer:
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push yl
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push yh
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adiw yh:yl, UART_HW_IFACE_OFFS_READBUF
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rcall uartHwRingBufferWriteGuarded ; R17, R18, X
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pop yh
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pop yl
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine UART_HW_InterfaceReadFromReadBuffer @global
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;
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; @return CFLAG on success, cleared on error
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; @return R16 byte read
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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UART_HW_InterfaceReadFromReadBuffer:
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push yl
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push yh
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adiw yh:yl, UART_HW_IFACE_OFFS_READBUF
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rcall uartHwRingBufferReadGuarded ; R17, R18, X
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pop yh
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pop yl
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine UART_HW_InterfaceWriteToWriteBuffer @global
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;
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; @return CFLAG on success, cleared on error
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; @param r16 byte to write
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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UART_HW_InterfaceWriteToWriteBuffer:
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push yl
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push yh
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adiw yh:yl, UART_HW_IFACE_OFFS_WRITEBUF
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rcall uartHwRingBufferWriteGuarded ; R17, R18, X
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pop yh
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pop yl
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine UART_HW_InterfaceReadFromWriteBuffer @global
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;
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; @return CFLAG on success, cleared on error
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; @return R16 byte read
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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UART_HW_InterfaceReadFromWriteBuffer:
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push yl
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push yh
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adiw yh:yl, UART_HW_IFACE_OFFS_WRITEBUF
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rcall uartHwRingBufferReadGuarded ; R17, R18, X
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pop yh
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pop yl
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine UART_HW_InterfaceAddOutgoingMsgNum @global
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;
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; @return CFLAG on success, cleared on error
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; @param r16 byte to write
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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UART_HW_InterfaceAddOutgoingMsgNum:
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push yl
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push yh
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adiw yh:yl, UART_HW_IFACE_OFFS_OUTMSGBUF
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rcall uartHwRingBufferWriteGuarded ; R17, R18, X
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pop yh
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pop yl
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine UART_HW_InterfaceGetNextOutgoingMsgNum @global
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;
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; @return CFLAG on success, cleared on error
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; @return R16 byte read
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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UART_HW_InterfaceGetNextOutgoingMsgNum:
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push yl
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push yh
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adiw yh:yl, UART_HW_IFACE_OFFS_OUTMSGBUF
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rcall uartHwRingBufferReadGuarded ; R17, R18, X
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pop yh
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pop yl
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine uartHwRingBufferReadGuarded
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;
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; @return CFLAG on success, cleared on error
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; @param r16 byte to write
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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uartHwRingBufferReadGuarded:
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push r15
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in r15, SREG
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cli
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rcall RingBufferY_ReadByte ; R17, R18, X
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brcc uartHwRingBufferReadGuarded_error
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out SREG, r15
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pop r15
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sec
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ret
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uartHwRingBufferReadGuarded_error:
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out SREG, r15
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pop r15
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clc
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine uartHwRingBufferWriteGuarded
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;
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; @return CFLAG on success, cleared on error
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; @param r16 byte to write
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; @param Y pointer to start of interface data
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; @clobbers R17, R18, X
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uartHwRingBufferWriteGuarded:
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push r15
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in r15, SREG
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cli
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rcall RingBufferY_WriteByte ; R17, R18, X
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brcc uartHwRingBufferWriteGuarded_error
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out SREG, r15
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pop r15
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sec
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ret
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uartHwRingBufferWriteGuarded_error:
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out SREG, r15
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pop r15
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clc
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ret
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; @end
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