Unable to detect my finger and ever get a reading

Question

Unable to detect my finger and ever get a reading

Opened this issue 4 years ago · 7 comments

I am using the stm32 blue pill. Thanks for sharing a quick start, this sensor has not been easy! Now hooking up my sensor and inspecting it via stm32cubeide live I can see in the Max30102_Init(huart**) everything is HAL OK, which is good..

going into Max30102_Task(void) the conditional block if(IsFingerOnScreen) is always false and never runs? where is this global var even located as it never is assigned and never takes on a value from what I see? Even if I comment that conditional out and run the below code the only values I see here are

uch_addr	uint8_t	13 '\r'	
uch_addr@entry	uint8_t	13 '\r'	
uch_data	uint8_t	36 '$'

so from the task I can ever switch(StateMachine)
but after the sensor is unable to detect my finger? any idea why?

the variables that I have created


    uint32_t heartRate = Max30102_GetHeartRate();
    uint32_t spo2 = Max30102_GetSpO2Value();

never contain any values ...

to confirms the SDA and SCK lines are hooked up properly, 3.3 V coming in along with the pull-up resistors attached. I can see the LED flash between cycles other than that I am unable to get anything working on it

Answer 1 · 2020-08-26T08:17:08.000Z

If the sensor cannot recognize your finger, you can increase the power of IR LED in waiting for finger time. Maybe it shines too low for recognize your finger.

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On 26.08.2020 06:38, Travis wrote: I am using the stm32 blue pill. Thanks for sharing a quick start, this sensor has not been easy! Now hooking up my sensor and inspecting it via stm32cubeide live I can see in the Max30102_Init(huart**) everything is HAL OK, which is good.. going into Max30102_Task(void) the conditional block *if(IsFingerOnScreen)* is always false and never runs? where is this global var even located as it never is assigned and never takes on a value from what I see? Even if I comment that conditional out and run the below code the only values I see here are |uch_addr uint8_t 13 '\r' ***@***.*** uint8_t 13 '\r' uch_data uint8_t 36 '$' | so from the task I can ever *switch(StateMachine)* but after the sensor is unable to detect my finger? any idea why? to confirms the SDA and SCK lines are hooked up properly, 3.3 V coming in along with the pull-up resistors attached. I can see the LED flash between cycles other than that I am unable to get anything working on it — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADFSY66PNNZWUYDXOL2COVTSCSGSRANCNFSM4QLL7NOA>.

Answer 2 · 2020-08-26T14:53:34.000Z

I will give that a try later, thanks for your reply

Answer 3 · 2020-08-26T22:54:27.000Z

@lamik I checked voltage it looks fine, tried the 3.3 V again and the 5 V with the same results - It is never able to detect my finger . Inspecting more carefully ( after I comment out the finger checking conditional ) to force it to go into the sampling I notice I am getting a memory error when my code goes into the algorithm file.. It should be noted I am using the STM32 blue pill which has lower memory than your nuecleo but I even dropped down the sampling to the lowest and still encounter this stepping through I do notice some values in the debugger, could you confirm these are accurate?

Answer 4 · 2020-08-26T22:54:33.000Z

TravJav commented 4 years ago

Answer 5 · 2020-08-27T07:02:49.000Z

You have a hard fault. Are you sure you are passing the pointers in right way? W dniu 27.08.2020 o 00:54, Travis pisze:

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@lamik <https://github.com/lamik> I checked voltage it looks fine, tried the 3.3 V again and the 5 V with the same results - It is never able to detect my finger . Inspecting more carefully ( after I comment out the finger checking conditional ) to force it to go into the sampling I notice I am getting a memory error when my code goes into the algorithm file.. It should be noted I am using the STM32 blue pill which has lower memory than your nuecleo but I even dropped down the sampling to the lowest and still encounter this stepping through I do notice some values in the debugger, could you confirm these are accurate? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADFSY64GJPERCM4LPZOYD43SCWHDBANCNFSM4QLL7NOA>.

Answer 6 · 2020-08-29T03:48:09.000Z

So what I think is happening actually is quite simply the memory restrictions on the blue pill can not handle the expanding stack.

I have STM32 (Blue Pill) ARM Cortex M3 72Mhz, 64kB Flash, 20Kb RAM - STM32F103C8

the loops are really hurting me, trying to find a way to shrink what you have or at least provide the bare min functionality of getting a SPO2 and Heart Rate without too much onboard processing. I will keep you updated though!

Answer 7 · 2020-08-29T14:02:39.000Z

If you want to simply reading, you can just delete the finger recognition in my library. W dniu 29.08.2020 o 05:48, Travis pisze:

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So what I think is happening actually is quite simply the memory restrictions on the blue pill can not handle the expanding stack. I have STM32 (Blue Pill) ARM Cortex M3 72Mhz, 64kB Flash, 20Kb RAM - STM32F103C8 the loops are really hurting me, trying to find a way to shrink what you have or at least provide the bare min functionality of getting a SPO2 and Heart Rate without too much onboard processing. I will keep you updated though! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADFSY64U33WBUC3BFAMW6BTSDB3AJANCNFSM4QLL7NOA>.