How to clean the interruption?

[lucasmilitao]

Good night! Please, i'm trying to use Transient Function from MMA8451q, and i want to work with interruption to detect quick movements. But, when i start the program, the interruption is already set... and i dont know how to clean.

MMA1_WriteReg8(0x2A, 0x08); //Standby mode and 400Hz
MMA1_WriteReg8(0x1D, 0x17); //Enables Z-axis, Latch (ELE = 1) and enables Motion Function setting HPF_BYP
MMA1_WriteReg8(0x1F, 0x08); //Threshold set to 0.5G
MMA1_WriteReg8(0x20, 0x01); //Count one event
MMA1_WriteReg8(0x2D, 0x20); //Enable Transient function enabling interruption pin

MMA1_ReadReg8(0x0C, &state); //Reading INT_SOURCE to CLEAN INT1  - I already tried to read this register to clean the interruption... but it's not working.

[Alice_Yang]

Hello Lucas,

It seems you also need read the register of   0x1E: TRANSIENT_SRC

In the register of   0x0C: INT_SOURCE shows :

Hope it helps

Have a great day,
TIC

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[lucasmilitao]

Hello Alice, 

Thanks, but I already tried this before, but nothing change. Is there something wrong with this part? I tried to modify the priority from the I2C and ExtInt too, but the result is allways the same.

MMA1_WriteReg8(0x2A, 0x08); //Standby mode and 400Hz
vTaskDelay(1);
MMA1_WriteReg8(0x1D, 0x17); //Enables Z-axis, Latch (ELE = 1) and enables Motion Function setting HPF_BYP
vTaskDelay(1);
MMA1_WriteReg8(0x1F, 0x08); //Threshold set to 0.5G
vTaskDelay(1);
MMA1_WriteReg8(0x20, 0x01); //Count one event
vTaskDelay(1);
MMA1_WriteReg8(0x2D, 0x20); //Enable Transient function enabling interruption pin
vTaskDelay(1);
MMA1_WriteReg8(0x2E, 0x20); //Enable Interruption INT 1
vTaskDelay(1);
MMA1_ReadReg8(0x0C, &state); //Reading INT_SOURCE to CLEAN INT1
vTaskDelay(1);
MMA1_ReadReg8(0x1E, &state); //Reading TRANSIENT_SRC to CLEAN INT1
vTaskDelay(1);

MMA1_Enable();

[Alice_Yang]

Hello Lucas,

 Sorry I haven't used this chip, there is a example about it , maybe you can refer to it ,

please have a look to check this code how to configure the interrupt :

https://community.nxp.com/docs/DOC-98836 

Hope it helps

Alice