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Вывод блока памяти данных » History » Version 6

krufter_multiclet, 07/19/2013 11:55 AM

1 1 krufter_multiclet 
h1. Вывод блока памяти данных
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+Для платы HW-MCP04:+





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<pre>





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.alias DM_START		0x00000000 ;start address DM for output by uart0





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.alias BLOCK_SIZE	0x00000100 ;end address DM for output by uart0





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.alias iterator1 2





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.alias iterator2 3





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.alias iterator3 4





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.alias byte_DM 5





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.alias UART_DATA    UART0_DATA





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.alias UART_BDR     UART0_BDR





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.alias UART_ST      UART0_ST





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.alias UART_CR      UART0_CR





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.alias UART_PORT_PIN  0x300





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.alias UART_PORT_BPS  GPIOB_BPS





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.text





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;config uart





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initUART:





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    jmp read_DM





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    getl 0x00000300





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    wrl @1, GPIOD_BPS





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    getl 0x00000104





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    wrl @1, UART_BDR





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    getl 0x00000003





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    wrl @1, UART_CR





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    setl #iterator1, 0x00000000





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    setl #iterator3, 4 ; send to uart fifo 32 bytes





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complete





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; read DM for define address as double word (64 bits)





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read_DM:





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    getl BLOCK_SIZE





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    subl @1, #iterator1





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    je @1, stop2





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    jne @2, out_DM





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    getl #iterator1





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    addl @1, DM_START





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    rdq @1





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    setq #byte_DM, @1





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    addl @4, 0x00000008





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    setl #iterator1, @1





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    setl #iterator2, 0





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    getl #iterator3





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    subl @1, 1





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    setl #iterator3, @1





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complete





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out_DM:





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    getl #iterator2





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    getl 56 ; write to tx fifo 8 bytes





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    subl @1, @2





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    je @1, full_FIFO





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    jne @2, out_DM





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    getq #byte_DM





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    slrq @1, #iterator2 





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    wrq @1, UART_DATA ; write to tx fifo only one byte





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    getl 8 





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    addl @1, #iterator2





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    setl #iterator2, @1





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complete





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; analyze iterator3 for sending all 4*8 bytes





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full_FIFO:





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    getl #iterator3





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    getl 0xFFFFFFFF





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    and @1, @2





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    je @1, buf_TXD





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    jne @2, read_DM





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complete





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; wait for fifo transmitter is empty





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buf_TXD:





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    rdl UART_ST





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    getl 0x00000004





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    and @1, @2





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    je @1, buf_TXD





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    jne @2, read_DM





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    setl #iterator3, 4





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complete





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; enable led 2,3





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stop2:





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    getl 0x1000





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complete





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</pre>





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+Замечание:+ размер блока BLOCK_SIZE должен быть выравнен на 8. Скоро появится пример вывода по UART с точностью до байта.