コード例 #1
0
static void write_register(uint8_t data, bool register_sel) {

	busy_wait();
	
	if(register_sel) set_rs();
	else		 clear_rs();

	clear_rw();
	config_bus_output();
	output_nibble(data);
	output_nibble(data << 4);
	config_bus_input();
}
コード例 #2
0
ファイル: lcd.c プロジェクト: phil-lavin/raspi-fprint-relay 
/*
* Writes a byte to the pin register in 2 4 bit nibbles
* Uses append/remove functions such that it maintains current pin state
*/
void write_4_bits(int bits, int char_mode) {
	usleep(1000);

	reset_all();
	set_rs(char_mode);

	write_pins_append(bits>>4);

	pulse_enable();

	write_pins_remove(0xf);
	write_pins_append(bits&0xf);

	pulse_enable();

	usleep(500);
	reset_all();
}
コード例 #3
0
uint8_t read_register(bool register_sel) {

	uint8_t data = 0;
	uint8_t upper4 = 0;
	uint8_t lower4 = 0;

	if(register_sel) set_rs();
	else		 clear_rs();

	set_rw();
	config_bus_input();
	upper4 = pulse_e();
	lower4 = pulse_e();
	data |= upper4;
	data |= (lower4 >> 4);
	
	return data;
}