/* returns
* - success: 0
*/
uint8_t teensy_init(void) {
CPU_PRESCALE(CPU_16MHz); // speed should match F_CPU in makefile
// onboard LED
DDRD &= ~(1<<6); // set D(6) as input
PORTD &= ~(1<<6); // set D(6) internal pull-up disabled
// keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
_led_all_off(); // (just to put the pins in a known state)
TCCR1A = 0b10101001; // set and configure fast PWM
TCCR1B = 0b00001001; // set and configure fast PWM
// I2C (TWI)
twi_init(); // on pins D(1,0)
// unused pins
teensypin_write_all_unused(DDR, CLEAR); // set as input
teensypin_write_all_unused(PORT, SET); // set internal pull-up enabled
// rows
teensypin_write_all_row(DDR, CLEAR); // set as input
teensypin_write_all_row(PORT, SET); // set internal pull-up enabled
// columns
teensypin_write_all_column(DDR, CLEAR); // set as input (hi-Z)
teensypin_write_all_column(PORT, CLEAR); // set internal pull-up
// disabled
return 0; // success
}
/* returns
* - success: 0
*/
uint8_t teensy_init(void)
{
// CPU speed : should match F_CPU in makefile
#if F_CPU != 16000000
#error "Expecting different CPU frequency"
#endif
CPU_PRESCALE(CPU_16MHz);
// onboard LED
// (tied to GND for hardware convenience)
DDRD &= ~(1<<6); // set D(6) as input
PORTD &= ~(1<<6); // set D(6) internal pull-up disabled
// (tied to Vcc for hardware convenience)
DDRB &= ~(1<<4); // set B(4) as input
PORTB &= ~(1<<4); // set B(4) internal pull-up disabled
// keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
_kb_led_all_off(); // (just to put the pins in a known state)
TCCR1A = 0b10101001; // set and configure fast PWM
TCCR1B = 0b00001001; // set and configure fast PWM
// I2C (TWI)
twi_init(); // on pins D(1,0)
// unused pins
teensypin_write_all_unused(DDR, CLEAR); // set as input
teensypin_write_all_unused(PORT, SET); // set internal pull-up enabled
// rows and columns
teensypin_write_all_row(DDR, CLEAR); // set as input (hi-Z)
teensypin_write_all_column(DDR, CLEAR); // set as input (hi-Z)
#if TEENSY__DRIVE_ROWS
teensypin_write_all_row(PORT, CLEAR); // pull-up disabled
teensypin_write_all_column(PORT, SET); // pull-up enabled
#elif TEENSY__DRIVE_COLUMNS
teensypin_write_all_row(PORT, SET); // pull-up enabled
teensypin_write_all_column(PORT, CLEAR); // pull-up disabled
#endif
return 0; // success
}
