cx-chlcd/source/hd44780.c

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

#include "chlcd.h"

#define __R(X) (if (X != CHLCD_SUCCESS) { return CHLCD_BAD_ARGUMENT; })

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);
    
    return CHLCD_SUCCESS;
}

#undef __R

#define __R(X) (if (X != CHLCD_SUCCESS) { return CHLCD_BAD_ARGUMENT; })

static chlcd_error_t __chlcd_hd44780_shift_register_send_byte(
    void *self_pointer,
    uint8_t content
) {
    chlcd_hd44780_shift_register_t *self
    = (chlcd_hd44780_shift_register_t *) self_pointer;

    

    self->last_state = content; 
}

#undef __R

#define __R(X) (if (X != CHLCD_SUCCESS) { return CHLCD_BAD_ARGUMENT; })

chlcd_error_t chlcd_hd44780_shift_register_init(void *self_pointer) {
    chlcd_hd44780_shift_register_t *self 
    = (chlcd_hd44780_shift_register_t *) self_pointer;

    __R(chlcd_pin_set_output(self->register_latch));
    __R(chlcd_pin_set_output(self->register_clock));
    __R(chlcd_pin_set_output(self->register_data));

    return CHLCD_SUCCESS;
}

#undef __R

chlcd_error_t chlcd_hd44780_direct_sender(
    void *self,
    chlcd_data_t content,
    bool is_command,
    bool is_half_word
) {
    return CHLCD_SUCCESS;
}

chlcd_error_t chlcd_hd44780_shift_register_sender(
    void *self,
    chlcd_data_t content,
    bool is_command,
    bool is_half_word
) {
    return CHLCD_SUCCESS;
}

static inline chlcd_error_t __chlcd_hd44780_decoder_init(
    void *connector,
    chlcd_sender_t sender
) {
    if (sender(connector, 0b0010, true, true) != CHLCD_SUCCESS) {
        return CHLCD_SEND_ERROR;
    }

    if (sender(connector, 0b00001111, true, false) != CHLCD_SUCCESS) {
        return CHLCD_SEND_ERROR;
    }

    return CHLCD_SUCCESS;
}

static inline chlcd_error_t __chlcd_hd4470_decoder_clear(
    void *connector,
    chlcd_sender_t sender;
) {
    if (sender(connector, 0b00000001, true, false) != CHLCD_SUCCESS) {
        return CHLCD_SEND_ERROR;
    }
    
    if (sender(connector, 0b00000010, true, false) != CHLCD_SUCCESS) {
        return CHLCD_SEND_ERROR;
    }

    return CHLCD_SUCCESS;
}

chlcd_error_t chlcd_hd44780_decoder(
    chlcd_command_t command,
    chlcd_data_t content,
    void *connector,
    chlcd_sender_t sender
) {
    switch (command) {
        case CHLCD_INIT:
            return __chlcd_hd44780_decoder_init(connector, init);

        case CHLCD_CLEAR:
            return __chlcd_hd44780_decoder_clear(connector, init);
    }
}