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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega325P датащи(PDF) 175 Page - ATMEL Corporation |
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ATmega325P датащи(HTML) 175 Page - ATMEL Corporation |
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175 / 364 page  175 8023F–AVR–07/09 ATmega325P/3250P The following code example shows a simple USART receive function that handles both nine bit characters and the status bits. Note: 1. See Section “5.” on page 10. The receive function example reads all the I/O Registers into the Register File before any com- putation is done. This gives an optimal receive buffer utilization since the buffer location read will be free to accept new data as early as possible. Assembly Code Example (1) USART_Receive: ; Wait for data to be received sbis UCSR0A, RXC0 rjmp USART_Receive ; Get status and 9th bit, then data from buffer in r18, UCSR0A in r17, UCSR0B in r16, UDRn ; If error, return -1 andi r18,(1<<FE0)|(1<<DOR0)|(1<<UPE0) breq USART_ReceiveNoError ldi r17, HIGH(-1) ldi r16, LOW(-1) USART_ReceiveNoError: ; Filter the 9th bit, then return lsr r17 andi r17, 0x01 ret C Code Example (1) unsigned int USART_Receive( void ) { unsigned char status, resh, resl; /* Wait for data to be received */ while ( !(UCSR0A & (1<<RXC0)) ) ; /* Get status and 9th bit, then data */ /* from buffer */ status = UCSR0A; resh = UCSR0B; resl = UDRn; /* If error, return -1 */ if ( status & (1<<FE0)|(1<<DOR0)|(1<<UPE0) ) return -1; /* Filter the 9th bit, then return */ resh = (resh >> 1) & 0x01; return ((resh << 8) | resl); } |
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