Other Parts Discussed in Thread: MSP-FET, TDC1000,
Tool/software: Code Composer Studio
Hi,
I am working with the TDC1000-TDC7200EVM board I am programming with a MSP-FET.
CCS version is 8.3.0.00009 (Mac OS) and complier is TI v18.1.5.LTS.
I can successfully write the TDC1000 / TDC7200 registers and do time measurement.
However, I have the following problem:
- After starting the time measurement with a SPI write to the TDC7200, I wait for the interrupt on the INTB pin of the TDC7200
- Once I get the interrupt, I do a SPI byte read to the TDC7200 to get the interrupt status registers
- I check the interrupt status to see if the time measurement is successful: if so, I start another SPI auto increment read function to get all TIMEn, CLOCK_COUNTn and CALIBRATIONn registers.
The second SPI function is not successful: I get zeros, it does not work. I tried many things and it seems the TDC7200 returns only one successful read command (which can be a byte read or multiple bytes read if using auto increment) once it has a successful time measurement. Following commands would return only zeros, as if the first read command also has the effect of erasing the measurement result registers.
I want to :
- Check first the interrupt status: I will not read the TIMEn, CLOCK_COUNTn and CALIBRATIONn registers if the measurement has failed (save time and power)
- Be able to do one read function for TIME1, CLOCK_COUNT1 and TIME2, then another read for CALIBRATION1 and CALIBRATION. I only have one STOP pulse so I do not need the rest, and I do not want to waste memory.
Can you help me?
Thanks,
Guillaume
