Posted on October 08, 2014 at 09:04
I have a STM32F3-discovery board, and I have set up a little test.
It just captures ALL input on GPIO3 and count them by channel.
Then every seconds, I have a breakpoint with which I look at the numbers, and reset them.
I am getting a correct number of interrupt, according to ODR setup, for the on-board sensor L3G4200D (channel 1) and for the mangetometer (DRDY, channel 2) part of
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM000275pdf
.
ButI can't make the accelerometer interrupt work. I've tried many ways, but basically I think the correct and most basic configuration should be:
CTRL_REG1_A (20h), turn on sensor (ODR != 0)CTRL_REG3_A (22h), I1_DRDY1 bit to 1
and then see the interrupt coming to channel 4 based.
Please note I also see ~700 interrupt on channel 3 (which is pin CS_SPI).
Channel seems correct from
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00063pdf
, so I think is an accelerometer problem.
Also note that I still call in a loop the accelerometer read, with, according to ZYXDA data ready bit of register STATUS_REG_A (27h) output the data at correct ODR (tried many ODR), so the interrupt should be fired (gyrosocpe wasn't firing new DRDY interrupt unless you read the data register).
#lsm303dlhc-interrupt-discovery
