Category: Hardware
Product Number: ADPD188BI
Hai i am using the ADPD188BI on a custom board.we have a total of 2 boards in which one board is working fine i am able to read the data from the FIFO buffer , but on the other board the FIFO value will be either 0 or FFFF. After initialization when it is in Normal mode Both boards led's are blinking which indicate that sampling is happening also interrupt is getting from gpio0. I am not able to understand why one board is showing different values.I will attach the initialization code is there anything more i should add in the function.
Thanks in advance for your support.
int adpd188bi_init_smoke_detector(void)
{
int ret;
uint16_t reg_data;
/* ------------------------------------------------------------------ */
/* Step 3 - Write recommended smoke-detector configuration (Table 26) */
/* ------------------------------------------------------------------ */
/* 0x11 - FIFO format: 32-bit sum for both Time Slot A and B */
ret = adpd188_reg_write(0x11, 0x30A9);
if (ret != 0)
return -1;
/* 0x12 - Sampling rate: 16 Hz */
ret = adpd188_reg_write(0x12, 0x0200);
if (ret != 0)
return -1;
/* 0x14 - Blue LED -> Slot A, IR LED -> Slot B, combine PDET1+PDET2 */
ret = adpd188_reg_write(0x14, 0x011D);
if (ret != 0)
return -1;
/* 0x15 - No inter-sample decimation/averaging */
ret = adpd188_reg_write(0x15, 0x0000);
if (ret != 0)
return -1;
/* 0x17 - Slot A integrator chop sequence: inv, norm, norm, inv */
ret = adpd188_reg_write(0x17, 0x0009);
if (ret != 0)
return -1;
/* 0x18 - Slot A, Channel 1: no ADC offset */
ret = adpd188_reg_write(0x18, 0x0000);
if (ret != 0)
return -1;
/* 0x19-0x1B - Slot A, Channels 2-4: unused */
ret = adpd188_reg_write(0x19, 0x3FFF);
if (ret != 0)
return -1;
ret = adpd188_reg_write(0x1A, 0x3FFF);
if (ret != 0)
return -1;
ret = adpd188_reg_write(0x1B, 0x3FFF);
if (ret != 0)
return -1;
/* 0x1D - Slot B integrator chop sequence: inv, norm, norm, inv */
ret = adpd188_reg_write(0x1D, 0x0009);
if (ret != 0)
return -1;
/* 0x1E - Slot B, Channel 1: no ADC offset */
ret = adpd188_reg_write(0x1E, 0x0000);
if (ret != 0)
return -1;
/* 0x1F-0x21 - Slot B, Channels 2-4: unused */
ret = adpd188_reg_write(0x1F, 0x3FFF);
if (ret != 0)
return -1;
ret = adpd188_reg_write(0x20, 0x3FFF);
if (ret != 0)
return -1;
ret = adpd188_reg_write(0x21, 0x3FFF);
if (ret != 0)
return -1;
/* 0x22 - LED3 (IR) coarse current */
ret = adpd188_reg_write(0x22, 0x3539);
if (ret != 0)
return -1;
/* 0x23 - LED1 (Blue) coarse current */
ret = adpd188_reg_write(0x23, 0x3536);
if (ret != 0)
return -1;
/* 0x24 - LED2 (unused) */
ret = adpd188_reg_write(0x24, 0x1530);
if (ret != 0)
return -1;
/* 0x25 - Default LED drive trim (all three LEDs) */
ret = adpd188_reg_write(0x25, 0x630C);
if (ret != 0)
return -1;
/* 0x30 - Slot A: 3 us LED pulse width */
ret = adpd188_reg_write(0x30, 0x0320);
if (ret != 0)
return -1;
/* 0x31 - Slot A: 4 pulses, 15 us LED period offset */
ret = adpd188_reg_write(0x31, 0x040E);
if (ret != 0)
return -1;
/* 0x35 - Slot B: 3 us LED pulse width */
ret = adpd188_reg_write(0x35, 0x0320);
if (ret != 0)
return -1;
/* 0x36 - Slot B: 4 pulses, 15 us LED period offset */
ret = adpd188_reg_write(0x36, 0x040E);
if (ret != 0)
return -1;
/* 0x39 - Slot A: AFE integrator timing window */
ret = adpd188_reg_write(0x39, 0x22F0);
if (ret != 0)
return -1;
/* Verify the AFE window write back (Slot A) */
ret = adpd188_reg_read(0x39, ®_data);
if (ret != 0)
return -1;
/* 0x3B - Slot B: AFE integrator timing window */
ret = adpd188_reg_write(0x3B, 0x22F0);
if (ret != 0)
return -1;
/* Verify the AFE window write back (Slot B) */
ret = adpd188_reg_read(0x3B, ®_data);
if (ret != 0)
return -1;
/* 0x3C - Power down Channel 2, Channel 3, and Channel 4 */
ret = adpd188_reg_write(0x3C, 0x31C6);
if (ret != 0)
return -1;
/* 0x42 - Slot A: 200 kOhm TIA gain */
ret = adpd188_reg_write(0x42, 0x1C34); /*newly added*/
if (ret != 0)
return -1;
/* 0x43 - Slot A: full analogue signal path (TIA -> BPF -> INT -> ADC) */
ret = adpd188_reg_write(0x43, 0xADA5);
if (ret != 0)
return -1;
/* 0x44 - Slot B: 200 kOhm TIA gain */
ret = adpd188_reg_write(0x44, 0x1C34); /*newly added*/
if (ret != 0)
return -1;
/* 0x45 - Slot B: full analogue signal path (TIA -> BPF -> INT -> ADC) */
ret = adpd188_reg_write(0x45, 0xADA5);
if (ret != 0)
return -1;
/* 0x58 - Chop math: subtract 1st & 4th pulse, add 2nd & 3rd pulse */
ret = adpd188_reg_write(0x58, 0x0544);
if (ret != 0)
return -1;
/* 0x54 - Photodiode cathode reverse-bias ~250 mV for both slots */
ret = adpd188_reg_write(0x54, 0x0AA0);
if (ret != 0)
return -1;
return 0;
}
