Other Parts Discussed in Thread: ADS1115
Good afternoon,
can anybody help me with some trouble I'm having with ADS1115IDGST. I can't read any value from it (I'm surprised about I can't getting value from config register what I set before). I'm using library for I2C bus, but I think that is working right because I have DAC on the same I2C bus also and I can communicate with it in both directions and values are correct.
I am using 100 kHz mode and 100 ns for falling and rising edges.
1. I write 10010000 and checking acknowledge (library have flag I2C_FLAG_TXIS)
2. I write 00000001 and checking acknowledge (by the same flag, this writing means by datasheet writing address of config register to pointer register)
3. Now I repeat start condition of I2C bus and sending address 10010000 and checking acknowledge
4. I write high byte of config register and checking acknowledge
5. I write low byte of config register and checking acknowledge
6. Now I sending stop condition
Here I insert some delay (approximately in ms)
7. Sending start condition
8. Sending address 10010000 and checking acknowledge
9. Sending byte 00000001 and checking acknowledge
10. I repeat start condition
11. Sending address 10010001 and checking acknowledge
12. Checking flag I2C_FLAG_RXNE (what means receiver buffer contains some received data)
But I freezes in the state 12, so the ADC doesn't send me any data from config register and not only from it (I have tried conversion register too). I am using the same flags with DAC and I received correct data, but ADS1115 not.
I have connected ADDR pin to the ground, on the SDA and SCL pins are 4k7 ohm pull-up resistors, ALERT/neg RDY I let unconnected, SDA and SCL in MCU are configured as open drain and output speed of theese pin are the lowest as can be (2MHz, but also there are 10MHz and 50MHz speeds).
I don't have any idea what I'm doing wrong, I have tried another piece of this ADC, I have tried sending stop after each transaction, and still having this trouble.
Best regards
Josef
