void check_boot_request (void)
{
if (digital_read (4, (1<<29)) == 0)
{
WDT_Init (WDT_CLKSRC_PCLK, WDT_MODE_RESET);
WDT_Start (10);
while (1);
}
}
/* Assumes MSB first. */
uint8_t shift_in(void) {
uint8_t byte = 0;
uint8_t pin_value;
for(int i=0; i<8; i++) {
pin_value = digital_read(SHIFT_IN_DATA);
byte |= (pin_value << ((8 - 1) - i));
/* printf("%d = %d \n", ((8 - 1) - i), pin_value); */
/* Pulse clock to write next bit. */
digital_write(SHIFT_IN_CLOCK, LOW);
digital_write(SHIFT_IN_CLOCK, HIGH);
}
return byte;
}
int main(void) {
init();
uart_init();
stdout = &uart_output;
stdin = &uart_input;
uint8_t i;
uint8_t register_value;
uint8_t pin_value;
while (1) {
/* Read in parallel input by setting SH/LD low. */
digital_write(&PORT_SHLD, SHLD, 0);
//_delay_ms(5);
/* Freeze data by setting SH/LD high. When SH/LD is high data enters */
/* to reqisters from SER input and shifts one place to the right */
/* (Q0 -> Q1 -> Q2, etc.) with each positive-going clock transition. */
digital_write(&PORT_SHLD, SHLD, 1);
register_value = 0;
for(i=0; i<8; i++) {
pin_value = digital_read(PIN_QH, QH);
register_value |= (pin_value << ((8 - 1) - i));
printf("%d = %d \n", ((8 - 1) - i), pin_value);
/* Pulse clock input (CP) LOW-HIGH to read next bit. */
digital_write(&PORT_CLK, CLK, 0);
//_delay_ms(5);
digital_write(&PORT_CLK, CLK, 1);
}
printf("%d \n", register_value);
_delay_ms(2000);
}
return 0;
}
bool digital_read(const unsigned char& mbed_pin)
{
return digital_read(get_port(mbed_pin), get_pin(mbed_pin));
}
