Hi,
I am working on ADPD188gg eval board interfaced with my custom MCU board i.e; I am not using the EVAL-ADPDUCZ microcontroller board. My custom MCU board connects to ADPD188gg via I2C. I am setting SLOTB_FIFO_MODE = 2 so each sample is 4 bytes. I am running the ADPD chip in float mode with 50 samples/sec rate.
I am trying to read data from 128byte FIFO using interrupt on GPIO0 line. I want to get GPIO interrupt when there are atlease 120bytes in the FIFO. But I see the interrupt is comes as soon as there are 4 bytes of data in the FIFO. The data itself is good but I want to get an interrupt only when atleast 120 bytes of data is ready. So that the MCU does not wake up too often.
Here is the register configuration set by my code in the following order:
| Register | Value | Comment |
| 0x0F | 0x0001 | Reset |
| 0x10 | 0x0001 | Program Mode |
| 0x02 | 0x0004 | GPIO0 enable in always driven active high config. GPIO1 disabled |
| 0x06 |
0x3C00
|
FIFO threshold = 0x3C = 60 words (120 bytes)
|
| 0x01 |
0x00BF
|
FIFO_INT_MASK = 0 (enable), SLOTB_INT_MASK = 0 (enable)
|
| 0x0B |
0x0001
|
GPIO0_ALT_CFG = 0x01 (interrupt on GPIO0, as defined in reg 0x01)
|
| 0x11 |
0x30A0
|
Enable "time slot B" with 32-bit sum of all four channels
|
| 0x12 |
0x00A0
|
sample rate = 50 samples/sec
|
| 0x14 |
0x0110
|
|
| 0x15 |
0x0000
|
|
| 0x34 |
0x0000
|
|
| 0x4B |
0x2695
|
|
| 0x58 |
0x0440
|
|
| 0x3C |
0x3206
|
|
| 0x54 |
0x0AA0
|
|
| 0x35 |
0x0235
|
|
| 0x36 |
0x1427
|
|
| 0x3B |
0x1D10
|
|
| 0x44 |
0x1C25
|
|
| 0x45 |
0xAE65
|
|
| 0x59 |
0x7008
|
|
| 0x23 |
0x1530
|
|
| 0x3F |
0x5F12
|
|
| 0x5A |
0x9F00
|
|
| 0x10 |
0x0002
|
Run Mode
|
After setting all above, the firmware sees interrupt on every 4 bytes of FIFO data instead of 120 bytes.
Can you suggest what configuration should be changed to make it work.
Thanks,
Syed Bilal Hasani
