FPPA实习.ppt

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2016-08-10 发布于天津
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FPPA实习.ppt

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FPPA实习.ppt

I2C 介面實作-AskACK- read ACK bit from slave mI2CAskACK: set1 mSCL; delay I2C_DELAY; set0 mSDA_IO; t0sn mSDA; goto serverNOACK; goto serverACK; serverACK: set1 mSDA_IO; set0 mSCL; delay I2C_DELAY; ret ACK; serverNOACK: set1 mSDA_IO; set0 mSCL; delay I2C_DELAY; ret NOACK; read data after clock I2C 介面實作-ACK/NOACK- write ACK/NOACK bit to slave mI2CACK: set1 mSDA_IO; set0 mSDA; set1 mSCL; delay I2C_DELAY; set0 mSCL; delay I2C_DELAY; ret; mI2CNOACK: set1 mSDA_IO; set1 mSDA; set1 mSCL; delay I2C_DELAY; set0 mSCL; delay I2C_DELAY; ret; write data before clock 24LC04B Write/Read *see 24LC04B datasheet 24LC04B Write/Read 流程(略) wait START Device Addressing Write Mode Read Mode Write Adddress Write Data Read Data (from current address++) (to current address++) STOP STOP restart restart wait START I2C 介面實作-24LC04B-Write START Word Address STOP ACK Control Byte ACK 啟動 I2C BUS 寫入資料(address) 停止 I2C BUS 尋找裝置 Data ACK 寫入資料 (to EEPROM) MASTER(FPPA) SLAVER(24LC04B) *continue redoWrite: call mI2CStart; mov a, mI2C_DEVICE_WRITE; mov mI2CData, a; call mI2CWriteDevice; call mI2CAskACK; mov a, 0x00; mov mI2CData, a; call mI2CWriteData; call mI2CAskACK; mov a, TEST_DATA; mov mI2CData, a; call mI2CWriteData; call mI2CAskACK; call mI2CStop; call Delay10MS; I2C 介面實作-24LC04B-Write START Word Address STOP ACK Control Byte ACK Data ACK *write cycle I2C 介面實作-24LC04B-Read Data ACK/NOACK START STOP Control Byte ACK 啟動 I2C BUS 讀出資料 (from EEPROM) 停止 I2C BUS 尋找裝置 START Word Address ACK Control Byte ACK 啟動 I2C BUS 寫入資料(address) 尋找裝置 MASTER(FPPA) SLAVER(24LC04B) *ACK-Continue *No ACK-Stop * FPPA 實習七字節－原理　ｈｇｆｅｄｃｂａ０００１１１１１１１０００００１１０２０１０１１０１１３０１００１１１１４０１１００１１０５０１１０１１０１６０１１１１１０１７００１００１１１８０１１１１１１１９０１１０１１１１ mov a, 0 /// 0 mov SEG_PORT, a; 七字節－掃描 set1 SEG0_COM; set0 SEG1_COM; /// TODO set0 SEG0_COM; set1 SEG1_COM; /// TODO SEG0_COM SEG1_COM displayLoop: set1 SEG0_COM; set1 SEG1_COM; mov a, 0 // 9 mov SEG_PORT, a;