User`s guide

A.3.2 – The buttons

The buttons are also connected to the P7-connection and can be used in the following manner:

void Init_Buttons(void){

EALLOW;

GpioMuxRegs.GPAMUX.bit.C1TRIP_GPIOA13=0; //Button B3

GpioMuxRegs.GPAMUX.bit.C2TRIP_GPIOA14=0; //Button B2

GpioMuxRegs.GPAMUX.bit.C3TRIP_GPIOA15=0; //Button B1

GpioMuxRegs.GPADIR.bit.GPIOA13=0; //Read

GpioMuxRegs.GPADIR.bit.GPIOA14=0;

GpioMuxRegs.GPADIR.bit.GPIOA15=0;

//Read BUTTONS ON or OFF:

GpioDataRegs.GPADAT.bit.GPIOA13=1; //Pull-up

GpioDataRegs.GPADAT.bit.GPIOA14=1;

GpioDataRegs.GPADAT.bit.GPIOA15=1;

EDIS;

}

Bool ButtonDown(int buttonNbr){

if (buttonNbr==1 && GpioDataRegs.GPADAT.bit.GPIOA15==0) return TRUE;

if (buttonNbr==2 && GpioDataRegs.GPADAT.bit.GPIOA14==0) return TRUE;

if (buttonNbr==3 && GpioDataRegs.GPADAT.bit.GPIOA13==0) return TRUE;

else return FALSE;

}

A.3.3 – Analog inputs and ADC

The 16 analog inputs are marked A1-A8 and B1-B8. However, this is somewhat misleading,

since their function calls are done using ADCINA0-ADCINA7 (from P9) and ADCINB0-

ADCINB7 (P5) respectively.

To understand how the ADC works and how to use it, the sample program

Example_281xAdcSoc (found in SPRC097) is highly recommended. The program measures

at analog inputs ADCINA2 and ADCINA3 (ie, A3 and A4 in our case)

Below is a particularly interesting segment of the code:

// Configure ADC

AdcRegs.ADCMAXCONV.all = 0x0001; // Setup 2 conv's on SEQ1

AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv.

AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x2; // Setup ADCINA2 as 2nd SEQ1 conv.

AdcRegs.ADCTRL2.bit.EVA_SOC_SEQ1 = 1; // Enable EVASOC to start SEQ1

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)

The first line indicates how many channels that are to be measured, (how much memory to be

freed in order to perform measurements) - if more inputs are desired, the value 0x0001 should

be increased. The next two lines sets which inputs are to be converted. Very logical, replace

0x3 against another value should ADCINA3 not be the preferred input.