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Re: I2C, Start condition 問題
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高級會員
 
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參考看看:
Wait_IIC: banksel PIR1 btfss PIR1,SSPIF goto $-1 bcf PIR1,SSPIF return 這段應該是在等I2C MODULE IDLE，或許你可以改變程式寫法，換成去偵測下面所說的這些BIT(擷取DATASHEET P.68)， Note: For bits ACKEN, RCEN, PEN, RSEN, SEN: If the I2C module is not in the IDLEmode, this bit may not be set (no spooling), and the SSPBUF may not be written (or writes to the SSPBUF are disabled). <補充>你使用這方法也可以，不過你先確認你的INTERRUPT是否有開啟，在去偵測START CONDITION產生後中斷旗標變化情形。
發表於: 2007/6/22 11:08
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I2C, Start condition 問題
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新會員
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小弟使用16F877, 用MPLAB寫組言
在使用I2C作傳輸; I2C一開始的Stat condition 時, 寫法如下 Start_IIC: banksel SSPCON2 bsf SSPCON2,SEN call Wait_IIC return 再來則會呼叫Wait_IIC, 寫法如下 Wait_IIC: banksel PIR1 btfss PIR1,SSPIF goto $-1 bcf PIR1,SSPIF return 1. 使用軟體MPLAB SIM模擬結果, 卻發生一直偵測SSPIF, 不是為"1"的狀態 2. 改為用硬體模擬MPLAB ICD2, 還是發生一樣的情況! 實在想不出為什麼, 請問各位大大, 有沒有想法可以分享一下! 謝謝
發表於: 2007/6/20 21:12
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