// initialize LCD pins and LCD controller
void lcd_init(void) {
// set direction of pins
IO_OPF(C, 3); // CS/ pin
IO_OP(E, 5); // DATA pin
IO_OP(F, 4); // WR/ pin
IO_OP(D, 2); // Backlight pin
// set default values to pins
CS1;
WR1;
DATA1;
LCD_BCK0;
// initialize timer 4 used to time WR/ signal
BSET(CLK_PCKENR1, 4); // enable clock to TIM4
TIM4_CR1 = 0b00001100; // no auto-reload, one-pulse,URS-overflow, disable
TIM4_IER = 0; // no interrupts
TIM4_PSCR = 0; // prescaler = 1
TIM4_ARR = 24; // it will be about 600kHz for WR/ signal
TIM4_CNTR = 0; // reset timer value
// initialize HT1621B
lcd_command(HT_BIAS_13 | (0b10 << HT_BIAS_SHIFT)); // BIAS 1/3, 4 COMs
lcd_command(HT_RC_256K); // clock RC 256kHz
lcd_command(HT_SYS_DIS); // OSC+BIAS off
lcd_command(HT_WDT_DIS); // disable WDT
lcd_command(HT_SYS_EN); // OSC on
lcd_command(HT_LCD_ON); // BIAS on
// initialize LCD task, will be used when sending following lcd_command-s
build(LCD);
activate(LCD, lcd_loop);
sleep(LCD); // no work yet
}
// initialize PPM pin and timer 3
void ppm_init(void) {
IO_OP(D, 0); // PPM output pin, TIM3_CH2
// initialize timer3 used to generate PPM signal
BSET(CLK_PCKENR1, 6); // enable master clock to TIM3
TIM3_CCMR2 = 0b01111000; // PWM2, OC2 preload, output mode
TIM3_CCER1 = 0b00010000; // polarity active-high, OC2 enable
TIM3_PSCR = PPM_PSC_SYNC;
TIM3_IER = 1; // update interrupt enable
TIM3_CR1 = 0b10000000; // auto-reload, URS-all, counter-disable
ppm_set_channels(3);
}
