MSP430FR2633: Captivate low power mode wake on prox and a GPIO

Hi 

I didn't fully understand your question. What does P1.6 generate IRQ on P1.1 mean?

Hi,

P1.6 is a GPIO input with interrupt capability and while the MSP430FR2633 is in LPM, if there is a transition from HIGH to LOW on P1.6, the device should wake up and raise an interrupt output on P1.1(I2C request signal). I am using this P1.1 to raise an interrupt to the host controller on touch events. So, the external GPIO P1.6 input also should wake the device and generate and interrupt (I2C REQ) on P1.1

Normally, the device wakes on proximity and if there is a touch, it raises an interrupt (I2C REQ) on P1.1. 

I hope this makes it clear. 

Thanks, for your quick reply.

Best regards 

Hi Ahmet,

It is clear now. Is there any problems in your project? You could refer to the example code.

dev.ti.com/.../node

Hi Allen,

I implemented this part but I have another question now. I also implemented an edit on I2C communication and added a new command to change the threshold levels on run-time. But i want to check if the conversion is ended and it is a suitable time to update the threshold levels of the buttons. Can I check the g_bDetectionFlag and if it is true, then does that mean there is no conversion and i can update the touch threshold levels?

Best regards

Hi Allen,

In CAPT_Interface.c file I have added these line into the CAPT_I2CRegisterReceiveHandler method. 

else if (g_ui8I2CDataBuffer[TL_PCKT_CMD_FIELD] == 0x20)
{
//uint8_t i=0,k=0;
uint8_t id = 0;
uint8_t threshold = 10;
id = g_ui8I2CDataBuffer[TL_PCKT_CMD_FIELD+2];
threshold = g_ui8I2CDataBuffer[TL_PCKT_CMD_FIELD+3];

// Treat this as a custom CMD to get raw data
//g_bConvTimerFlag
//if( g_bConvTimerFlag==false)
if( (g_bEndOfConversionFlag==true) && (threshold > 5))
{
MAP_CAPT_stopTimer();
MAP_CAPT_clearTimer();
switch (id)
{
case 0:
pSensor->pCycle[1]->pElements[0]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 1:
pSensor->pCycle[3]->pElements[0]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 2:
pSensor->pCycle[3]->pElements[1]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 3:
pSensor->pCycle[2]->pElements[0]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 4:
pSensor->pCycle[0]->pElements[0]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 5:
pSensor->pCycle[3]->pElements[2]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 6:
pSensor->pCycle[2]->pElements[1]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 7:
pSensor->pCycle[2]->pElements[2]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 8:
pSensor->pCycle[1]->pElements[1]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 9:
pSensor->pCycle[3]->pElements[3]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 10:
pSensor->pCycle[1]->pElements[2]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 11:
pSensor->pCycle[2]->pElements[3]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 12:
pSensor->pCycle[0]->pElements[1]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 13:
pSensor->pCycle[0]->pElements[2]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
case 14:
pSensor->pCycle[0]->pElements[3]->ui8TouchThreshold = threshold;
// __delay_cycles(8000);
break;
// case 15:
// pSensor->ui16ConversionCount=threshold;
// break;
// case 16:
// pSensor->ui16ConversionGain=threshold;
// break;
// case 17:
// pSensor->ui16ProxThreshold=threshold;
// break;
default:
break;
}
g_ui8I2CDataBuffer[TL_PCKT_CMD_FIELD+2]=0xAA; //success
//CAPT_calibrateUI(&g_uiApp);
MAP_CAPT_startTimer();
}

else
{
g_ui8I2CDataBuffer[TL_PCKT_CMD_FIELD+2]=0xFF; //fail
// MAP_CAPT_stopTimer();
// MAP_CAPT_clearTimer();
// CAPT_calibrateUI(&g_uiApp);
// MAP_CAPT_startTimer();
}

}

this is my code and I am returning a FAIL or SUCCESS message to the host. I used some of the tickets in the forum. I am sending 4 bytes of data from the host to the MSP430FR2633 which includes 1st byte is command, 2nd byte is sensor id, 3rd byte is element id and 4th byte is threshold level. I commented out CAPT_calibrateUI(&g_uiApp) function because it creates some problem, the MSP430 does not work after this command. 

Can you check if there is a problem with this code and something to fix. 

With kind regards

Hi 

What problem cause MSP doesn't work? Can you descript it more detailly. The conversion will not influence setting the threshold. You can have a try to change the threshold when you need instead of waiting for conversion end.

Hi Allen,

I am normally checking the endofconversion flag and if it is set, I am updating the parameters. If I uncomment the CAPT_calibrateUI part, the endofconversion flag is never set, and also i don't get a touch interrupt anymore. I don't know why but it looks like timer is not starting again, maybe it is because i didn't reload the timer.

Best regards,