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Re: 請問C18 LIB SPI code
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版主
 
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是的，當有 write collision 發生時，回傳值小於 0 (-1)
發表於: 2007/6/8 22:00
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請問C18 LIB SPI code
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新會員
 
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/********************************************************************
* Function Name: WriteSPI2 * * Return Value: Status byte for WCOL detection. * * Parameters: Single data byte for SPI2 bus. * * Description: This routine writes a single byte to the * * SPI2 bus. * ********************************************************************/ unsigned char WriteSPI2( unsigned char data_out ) { SSP2BUF = data_out; // write byte to SSP2BUF register if ( SSP2CON1 & 0x80 ) // test if write collision occurred return ( -1 ); // if WCOL bit is set return negative # else { while( !SSP2STATbits.BF ); // wait until bus cycle complete } return ( 0 ); // if WCOL bit is not set return non-negative# } 這是原廠 spi code , function type is "unsigned char",當失敗時接收到的值會是 -1 嗎?
發表於: 2007/6/8 13:51
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