int main(int argc, char **argv) {
int value1,value2;
printf("Gumstix GPIO test\n");
gpio_enable(146);
gpio_enable(147);
gpio_set_write(146);
gpio_set_write(147);
value1=gpio_read(146);
value2=gpio_read(147);
value2=!value1;
while(1){
gpio_write(146,value1);
gpio_write(147,value2);
value1=!value1;
value2=!value2;
usleep(500000);
}
return 0;
}
void HardwareSerial::begin(unsigned int baud) {
// for now, do nothing. We will use whatever the ISP had set up.
measurePCLK();
#if MCU == MCU_ARM7TDMI
//Set up the pins
if(port==0) {
gpio_set_write(0);
gpio_set_read(1);
set_pin(0,1); //TX0
set_pin(1,1); //RX0
} else {
gpio_set_write(8);
gpio_set_read(9);
set_pin(8,1); //TX1
set_pin(9,1); //RX1
}
#else
//This only knows how to set up UART0.
IODIR(0)|= (1<<2); //TX set to output
IODIR(0)&=~(1<<3); //RX set to input
IOCON(0,2)=(0b010 << 0) | //Function TX0
(0b00 << 3) | //No pullup/pulldown
(0b0 << 5) | //No hysteresis
(0b0 << 6) | //No inversion
(0b0 << 9) | //Standard slew
(0b0 <<10) ; //Not open-drain
IOCON(0,3)=(0b010 << 0) | //Function RX0
(0b00 << 3) | //No pullup/pulldown
(0b0 << 5) | //No hysteresis
(0b0 << 6) | //No inversion
(0b0 << 9) | //Standard slew
(0b0 <<10) ; //Not open-drain
#endif
ULCR(port) = (3 << 0) | //8 data bits
(0 << 2) | //1 stop bit
(0 << 3) | //No parity
(0 << 4) | //I said, no parity!
(0 << 6) | //No break transmission
(1 << 7); //DLAB = 1
//DLAB - Divisor Latch Access bit. When set, a certain memory address
// maps to the divisor latches, which control the baud rate. When
// cleared, those same addresses correspond to the processor end
// of the FIFOs. In other words, set the DLAB to change the baud
// rate, and clear it to use the FIFOs.
unsigned int Denom=PCLK/baud;
unsigned int UDL=Denom/16;
UDLM(port)=(UDL >> 8) & 0xFF;
UDLL(port)=(UDL >> 0) & 0xFF;
UFDR(port)=0x10; //reset nilpotent value
UFCR(port) = (1 << 0) | //FIFOs on
(1 << 1) | //Clear rx FIFO
(1 << 2) | //Clear tx FIFO
(3 << 6); //Rx watermark=14 bytes
ULCR(port) = ULCR(port) & ~(1<<7); //Turn of DLAB - FIFOs accessable
UIER(port)=0;
}
