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Опитвам да свържа pic24FJ32GA004 с TCN75AVOA с хардуерния I2C.
Гледам на осцилоскоп данните. Контролера праща всичко както трябва, сензорът отговаря с ACK при всеки байт, но като се стигне до данните изпраща само единици.
Ето го кода:
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| Код: void config_i2c1_write(){ I2C1CON=0b1000001000110000; I2C1BRG=39; IdleI2C1(); StartI2C1(); /* Wait till Start sequence is completed */ while(I2C1CONbits.SEN); /* Clear interrupt flag */ IFS1bits.MI2C1IF = 0; /*send address for write*/ MasterWriteI2C1(0x9e);//9f while(I2C1STATbits.TBF); // 8 clock cycles while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle IFS1bits.MI2C1IF = 0; // Clear interrupt flag /*send pointer*/ MasterWriteI2C1(0x00);//9f while(I2C1STATbits.TBF); // 8 clock cycles while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle IFS1bits.MI2C1IF = 0; // Clear interrupt flag /*send adress for read*/ MasterWriteI2C1(0x9f);//9f while(I2C1STATbits.TBF); // 8 clock cycles while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle IFS1bits.MI2C1IF = 0; // Clear interrupt flag value = MasterReadI2C1(); while(I2C1STATbits.RBF); // 8 clock cycles while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle IFS1bits.MI2C1IF = 0; // Clear interrupt flag AckI2C1(); while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle IFS1bits.MI2C1IF = 0; // Clear interrupt flag value = MasterReadI2C1(); while(I2C1STATbits.RBF); // 8 clock cycles while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle IFS1bits.MI2C1IF = 0; // Clear interrupt flag NotAckI2C1(); while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle IFS1bits.MI2C1IF = 0; // Clear interrupt flag return; } | |
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Ето и изходния сигнал:
http://img188.imageshack.us/img188/5918/comm2e.png
Някой може ли да окаже братска помощ?
п.с. да уточня: към А0-А2 съм подал 3.3 V.