topic Accelerometer External Interrupt on LPC1769 in LPC Microcontrollers

Accelerometer External Interrupt on LPC1769

muhammadarifbi1 — Sun, 09 Apr 2017 06:39:06 GMT

I want to trigger a freefall interrupt using the accelerometer module MMA7455 on my base board. I have read the data sheet but I am unclear how to go about setting it to an EINTx interrupt handler. The accelerometer is connected as such: INT1/DRDY -> P2.5 & INT2 -> P1.8. Attached is my code in the limited accelerometer library I was given. I have very little understanding on how to configure the registers and pins so any help is greatly appreciated.

Original Attachment has been moved to: acc.c.zip

Re: Accelerometer External Interrupt on LPC1769

Carlos_Mendoza — Mon, 10 Apr 2017 21:27:34 GMT

Hi Muhammand,

I would recommend you to use the following document created by a colleague as reference on how to initialize and configure the accelerometer:

MMA8451Q -Single Tap Detection Bare metal example project

About the LPC part, you can use the LPCOpen periph_pinint example that demonstrates use of the GPIO pin interrupts and the periph_i2c that shows how to use I2C interface in master and slave mode using POLLING/INTERRUPT method.

Hope it helps!

Best Regards,
Carlos Mendoza
Technical Support Engineer