cx-chlcd/sources/hd44780_direct_sender.c

#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>

#include <cx/chlcd.h>
#include <cx/chlcd/__helper.h>


chlcd_error_t chlcd_hd44780_direct_sender_init(void *self_pointer) {
    chlcd_hd44780_direct_connector_t *self 
    = (chlcd_hd44780_direct_connector_t *) self_pointer;

    __R(chlcd_pin_set_output(self->e));
    __R(chlcd_pin_set_output(self->rs));
    __R(chlcd_pin_set_output(self->d4));
    __R(chlcd_pin_set_output(self->d5));
    __R(chlcd_pin_set_output(self->d6));
    __R(chlcd_pin_set_output(self->d7));

    __R(chlcd_pin_write(self->d7, false));
    __R(chlcd_pin_write(self->d6, false));
    __R(chlcd_pin_write(self->d5, false));
    __R(chlcd_pin_write(self->d4, false));
    __R(chlcd_pin_write(self->rs, false));
    __R(chlcd_pin_write(self->e, false));
    
    return CHLCD_SUCCESS;
}

chlcd_error_t __chlcd_hd44780_direct_sender_send_half_byte(
    chlcd_hd44780_direct_connector_t *self,
    uint8_t content,
    bool is_command
) {
    __R(chlcd_pin_write(self->d7, (content & 0b10000000)));
    __R(chlcd_pin_write(self->d6, (content & 0b01000000)));
    __R(chlcd_pin_write(self->d5, (content & 0b00100000)));
    __R(chlcd_pin_write(self->d4, (content & 0b00010000)));
    __R(chlcd_pin_write(self->rs, !is_command));

    __R(chlcd_pin_write(self->e, true));
    __R(chlcd_sleep_us(2000));
    __R(chlcd_pin_write(self->e, false));
    __R(chlcd_sleep_us(2000));

    return CHLCD_SUCCESS;
}

chlcd_error_t chlcd_hd44780_direct_sender(
    void *self_pointer,
    chlcd_data_t content,
    bool is_command,
    bool is_half_word
) {
    chlcd_hd44780_direct_connector_t *self 
    = (chlcd_hd44780_direct_connector_t *) self_pointer;

    if (!is_half_word) {
        __R(__chlcd_hd44780_direct_sender_send_half_byte(
            self, 
            content,
            is_command
        ));
    }

    content = content << 4;

    __R(__chlcd_hd44780_direct_sender_send_half_byte(
        self, 
        content,
        is_command
    ));

    return CHLCD_SUCCESS;
}