I have TDC1000-TDC7200EVM with me and Its operating fine with default values and jumpers. I want to test it by using MSP430 MCU's clock by bypassing TDC7200 completely. My question is how to do this? What all jumpers I need to change and what all values in software GUI I need to change? Thanks.
PS: To get status of jumpers on my EVM currently, Please find attached picture below.
Hi Vishy Viswanathan I tried files provided by you but I am facing few issues:
a) JP5 is set to CPU.
b) I am using *TDC1000_Setup_MSP430TDC.txt* load file.(attached also)
TDC1000_Config0 44 TDC1000_Config1 41 TDC1000_Config2 00 TDC1000_Config3 05 TDC1000_Config4 5F TDC1000_TOF-1 40 TDC1000_TOF-0 1E TDC1000_Error_Flags 00 TDC1000_Timeout 23 TDC1000_Clock_Rate 01 TDC1000_Conts_Trigger 00 TDC7200_Config1 02 TDC7200_Config2 40 TDC7200_Interrupt_Status 00 TDC7200_Interrupt_Mask 07 TDC7200_Coarse_Cntr_Ov_H FF TDC7200_Coarse_Cntr_Ov_L FF TDC7200_Clock_Cntr_Ov_H FF TDC7200_Clock_Cntr_Ov_L FF TDC7200_Clock_Cntr_Stop_Mask_H 00 TDC7200_Clock_Cntr_Stop_Mask_L 00 TRIGGER_UPDATE_FREQ 0001 TDC_AVG/STDEV_NUM_ELEMS 000A SAVE_GRAPH_DATA_TO_FILE 00 FLOW_MODE_SELECT 00 Y-SCALE_CENTER 00C8 X-SCALE_RANGE 0032 MEASURE_RTD1 00 SAVE_RESULT_REGR_TO_FILE 00 GRAPH_MULTI_STOPS 00 TDC_SELECT 00 TEMP_RTD_SELECT 00 TEMP_RTD_MODE 01 TEMP_AVG/STDEV_NUM_ELEMS 000A SAVE_TEMP_DATA 00 GRAPH_YMAX_DATA 0000000000009BBB GRAPH_YMIN_DATA 0000000000009A2B TDC1000-HV_DRV_EN1 00 TDC1000-HV_DRV_EN2 00 HV_DRV_EN1_Period 001E HV_DRV_EN2_Period 001E ENABLE_POWER_CYCLE 00 CLK_FREQ_(1-16MHz) 8.000000 CLK_SOURCE_SEL 00 CPU_CLK_FREQ 05 CPU_CLK_EN 00 TDC1000-HV_BST_PWR_EN 00 HV_BST_PWR_EN_Period 0000 FWD2REV_FLOW_DELAY 0000 TDC1000-IMPE_MATCH_EN 00 ENABLE_UART_STREAM 00 ENABLE_MSP430TIMER_TDC 01
c) Actual level of water is approx. 5.3 cm (photo attached of container) as shown while using TDC7200(also confirmed using scale)
d) Bypassing TDC7200 shows water level approx 796 cm. (Please find screen shots attached of 'Graph' tab and 'Tank Level'tab)
I also tried playing around with register values by understanding them like, Increasing tx pulses, adjusting threshold voltage value, adjusting timeout, adjusting PGA/LNA etc but It didn't worked out. It just keep showing wrong values. Please look into matter and revert on this.
Here's the register settings I start with (note: echo qual threshold is set at the lowest -1500mv & continuous trigger is Green)
Corresponding to above settings, here's what I see on the scope (yellow CH1 is start, green CH2 is stop, purple CH3 is COMP_IN & note there's no stop pulse corresponding to the echo is seen as the threshold is set way out)
I changed echo threshold level to -410mV in the register settings
Here's a scope shot corresponding to this change (note the stop pulse corresponding to the echo)
I change echo qual threshold to -220mv in the register settings below
Scope shot for this change (a wider stop pulse corresponding to a lower threshold)
Here's a screen shot of the graphing & tank level (note MSP430 uses 12MHz as timer clock, so 1 timer tick corresponds to about 83.33ns and this is the step size of the variations)
Thanks
I show my setup again below - note this time clock jumper JP6 is set to CPU clock
In the GUI setup tab, I choose 2MHz CPU clock source as shown below
Note I am still using MSP430 as the TDC timer above. Now in the register settings, I update TX_FREQ_DIV to 2 so transducer burst is at 1MHz, with all the other register settings remain the same
Scope capture of the signals corresponding to this is shown below. Note TOF is approximately 140.4us below
Graph and tank measurements below
Thanks.
