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Arduino Library for the AFE4490 SPO2 shield and breakout boards from Protocentral

License: MIT License

C++ 100.00%

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protocentral-afe4490-arduino's Issues

[enhancement] Consider supporting both AFE4400 and AFE4490 register maps/values via #def

The AFE4400 and AFE4490 have different setup register values since the 4400 is a feature subset of the 4490.
A good enhancement would be to have a #define for which chip to compile for and appropriately choose the correct register value set in

protocentral-afe4490-arduino/src/protocentral_afe44xx.cpp

Lines 117 to 153 in b3471f6

    
           afe44xxWrite(CONTROL0, 0x000000); 
        
           afe44xxWrite(CONTROL0, 0x000008); 
        
           afe44xxWrite(TIAGAIN, 0x000000); // CF = 5pF, RF = 500kR 
        
           afe44xxWrite(TIA_AMB_GAIN, 0x000001); 
        
           afe44xxWrite(LEDCNTRL, 0x001414); 
        
           afe44xxWrite(CONTROL2, 0x000000); // LED_RANGE=100mA, LED=50mA 
        
           afe44xxWrite(CONTROL1, 0x010707); // Timers ON, average 3 samples 
        
           afe44xxWrite(PRPCOUNT, 0X001F3F); 
        
           afe44xxWrite(LED2STC, 0X001770); 
        
           afe44xxWrite(LED2ENDC, 0X001F3E); 
        
           afe44xxWrite(LED2LEDSTC, 0X001770); 
        
           afe44xxWrite(LED2LEDENDC, 0X001F3F); 
        
           afe44xxWrite(ALED2STC, 0X000000); 
        
           afe44xxWrite(ALED2ENDC, 0X0007CE); 
        
           afe44xxWrite(LED2CONVST, 0X000002); 
        
           afe44xxWrite(LED2CONVEND, 0X0007CF); 
        
           afe44xxWrite(ALED2CONVST, 0X0007D2); 
        
           afe44xxWrite(ALED2CONVEND, 0X000F9F); 
        
           afe44xxWrite(LED1STC, 0X0007D0); 
        
           afe44xxWrite(LED1ENDC, 0X000F9E); 
        
           afe44xxWrite(LED1LEDSTC, 0X0007D0); 
        
           afe44xxWrite(LED1LEDENDC, 0X000F9F); 
        
           afe44xxWrite(ALED1STC, 0X000FA0); 
        
           afe44xxWrite(ALED1ENDC, 0X00176E); 
        
           afe44xxWrite(LED1CONVST, 0X000FA2); 
        
           afe44xxWrite(LED1CONVEND, 0X00176F); 
        
           afe44xxWrite(ALED1CONVST, 0X001772); 
        
           afe44xxWrite(ALED1CONVEND, 0X001F3F); 
        
           afe44xxWrite(ADCRSTCNT0, 0X000000); 
        
           afe44xxWrite(ADCRSTENDCT0, 0X000000); 
        
           afe44xxWrite(ADCRSTCNT1, 0X0007D0); 
        
           afe44xxWrite(ADCRSTENDCT1, 0X0007D0); 
        
           afe44xxWrite(ADCRSTCNT2, 0X000FA0); 
        
           afe44xxWrite(ADCRSTENDCT2, 0X000FA0); 
        
           afe44xxWrite(ADCRSTCNT3, 0X001770); 
        
           afe44xxWrite(ADCRSTENDCT3, 0X001770); 
        
           delay(1000);

Currently, the file is named as protocentral_afe44xx.cpp but contains invalid register values for the AFE4400.

[Invalid] CONTROL2 value invalid for 4400

Bits 8 and 17 in CONTROL2 must be 1 for 4400:

protocentral-afe4490-arduino/src/protocentral_afe44xx.cpp

Line 122 in b3471f6

afe44xxWrite(CONTROL2, 0x000000); // LED_RANGE=100mA, LED=50mA

[bug] Timing controls violate deadbands as mentioned in the AFE4400 datasheet. Result in noisy and therefore incorrect readings.

As mentioned, the timing scheme violates the 2x 4HMz clock cycle deadbands.
Snip from AFE4400 Datasheet:

Example violations:

protocentral-afe4490-arduino/src/protocentral_afe44xx.cpp

Line 145 in b3471f6

afe44xxWrite(ADCRSTCNT0, 0X000000);

protocentral-afe4490-arduino/src/protocentral_afe44xx.cpp

Line 146 in b3471f6

afe44xxWrite(ADCRSTENDCT0, 0X000000);

These need to be at least 2 clock cycles apart.

Resulting data:

Image from Protocentral blog shows cleaner data, so likely that the timing scheme needs updating on GitHub.

[Invalid] LEDCNTRL value invalid for AFE4400

Bit 16 in LEDCNTRL must be 1 for 4400:

protocentral-afe4490-arduino/src/protocentral_afe44xx.cpp

Line 121 in b3471f6

afe44xxWrite(LEDCNTRL, 0x001414);

[Bug, Invalid] CONTROL1 value invalid for AFE4400 and AFE4490

Value of CONTROL1 is invalid for both 4400 and 4491. Bits 12-23 all need to be 0.
Also, Bit 8 needs to be 1.

protocentral-afe4490-arduino/src/protocentral_afe44xx.cpp

Line 123 in b3471f6

afe44xxWrite(CONTROL1, 0x010707); // Timers ON, average 3 samples

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	afe44xxWrite(CONTROL0, 0x000000);
	afe44xxWrite(CONTROL0, 0x000008);
	afe44xxWrite(TIAGAIN, 0x000000); // CF = 5pF, RF = 500kR
	afe44xxWrite(TIA_AMB_GAIN, 0x000001);
	afe44xxWrite(LEDCNTRL, 0x001414);
	afe44xxWrite(CONTROL2, 0x000000); // LED_RANGE=100mA, LED=50mA
	afe44xxWrite(CONTROL1, 0x010707); // Timers ON, average 3 samples
	afe44xxWrite(PRPCOUNT, 0X001F3F);
	afe44xxWrite(LED2STC, 0X001770);
	afe44xxWrite(LED2ENDC, 0X001F3E);
	afe44xxWrite(LED2LEDSTC, 0X001770);
	afe44xxWrite(LED2LEDENDC, 0X001F3F);
	afe44xxWrite(ALED2STC, 0X000000);
	afe44xxWrite(ALED2ENDC, 0X0007CE);
	afe44xxWrite(LED2CONVST, 0X000002);
	afe44xxWrite(LED2CONVEND, 0X0007CF);
	afe44xxWrite(ALED2CONVST, 0X0007D2);
	afe44xxWrite(ALED2CONVEND, 0X000F9F);
	afe44xxWrite(LED1STC, 0X0007D0);
	afe44xxWrite(LED1ENDC, 0X000F9E);
	afe44xxWrite(LED1LEDSTC, 0X0007D0);
	afe44xxWrite(LED1LEDENDC, 0X000F9F);
	afe44xxWrite(ALED1STC, 0X000FA0);
	afe44xxWrite(ALED1ENDC, 0X00176E);
	afe44xxWrite(LED1CONVST, 0X000FA2);
	afe44xxWrite(LED1CONVEND, 0X00176F);
	afe44xxWrite(ALED1CONVST, 0X001772);
	afe44xxWrite(ALED1CONVEND, 0X001F3F);
	afe44xxWrite(ADCRSTCNT0, 0X000000);
	afe44xxWrite(ADCRSTENDCT0, 0X000000);
	afe44xxWrite(ADCRSTCNT1, 0X0007D0);
	afe44xxWrite(ADCRSTENDCT1, 0X0007D0);
	afe44xxWrite(ADCRSTCNT2, 0X000FA0);
	afe44xxWrite(ADCRSTENDCT2, 0X000FA0);
	afe44xxWrite(ADCRSTCNT3, 0X001770);
	afe44xxWrite(ADCRSTENDCT3, 0X001770);
	delay(1000);