VA10800/VA10820 Evaluation Board User’s Manual
V3.0
31
Second, the main routine (inside file reb_main.c) should be opened and some code added. If
not already open, please double click on the demonstration project,
../software/mcu/project/reb1_va108xx. Navigate to a section of the code around line 58 that
already sets up the port pin for driving LED2.
Since we are not using the GPIO_DRIVER library, the “else” section will be compiled. Modify
the lines that setup the direction, datamask and dataout registers to include PORTA6. It should
look something similar to:
VOR_GPIO->BANK[0].DIR |= (1 << PORTA_10_D2) | (1 << PORTA_6_D4);
VOR_GPIO->BANK[0].DATAMASK |= (1 << PORTA_10_D2) | (1 << PORTA_6_D4);
VOR_GPIO->BANK[0].DATAOUT &= ~((1 << PORTA_10_D2| (1 << PORTA_6_D4)));
Next we need to toggle the pin on 400 msec intervals. Navigate to code near line 120 in
reb_main.c. This is a subroutine that is entered every 100 msec. The time base is set by a timer
interrupt. We will need to count to 4 before toggling the port pin. A variable must be created
for this counting purpose. Place the following code at the top of the reb_main.c routine with
the other variable declarations:
uint8_t cnt_400msec = 0 ;
Now, please enter the following code in green to count to 4 and toggle the pin.
if( VOR_TIM0_MSecExpired() ) {
cnt_100msec ++ ;
if (cnt_100msec > 3)
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