fw/fe310/eos/dev/lcd.c


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#include <stdlib.h>
#include <stdint.h>

#include "platform.h"
#include "board.h"

#include "eos.h"

#include "soc/pwr.h"
#include "soc/i2s.h"
#include "soc/timer.h"

#include "eve/eve.h"

#include "egpio.h"
#include "egpio_priv.h"
#include "spi.h"

#include "drv/ili9806e.h"
#include "lcd.h"

static int lcd_enable(void) {
    int rv;

    rv = eos_egpio_set_val(EGPIO_PIN_LCD_EN, 1);
    return rv;
}

static int lcd_disable(void) {
    int rv;

    rv = eos_egpio_set_val(EGPIO_PIN_LCD_EN, 0);
    return rv;
}

static int lcd_enabled(void) {
    return eos_egpio_get_val(EGPIO_PIN_LCD_EN);
}

static int lcd_select(void) {
    int rv;

    if (eos_i2s_running()) return EOS_ERR_BUSY;

    GPIO_REG(GPIO_OUTPUT_XOR)   |=  (1 << SPI_CSPIN_LCD);
    GPIO_REG(GPIO_OUTPUT_VAL)   |=  (1 << SPI_CSPIN_LCD);
    GPIO_REG(GPIO_OUTPUT_EN)    |=  (1 << SPI_CSPIN_LCD);

    rv = eos_spi_select(EOS_SPI_DEV_LCD);
    if (rv) {
        GPIO_REG(GPIO_OUTPUT_EN)    &= ~(1 << SPI_CSPIN_LCD);
        GPIO_REG(GPIO_OUTPUT_XOR)   &= ~(1 << SPI_CSPIN_LCD);
        GPIO_REG(GPIO_OUTPUT_VAL)   &= ~(1 << SPI_CSPIN_LCD);

        return rv;
    }

    return EOS_OK;
}

static void lcd_deselect(void) {
    eos_spi_deselect();

    GPIO_REG(GPIO_OUTPUT_EN)    &= ~(1 << SPI_CSPIN_LCD);
    GPIO_REG(GPIO_OUTPUT_XOR)   &= ~(1 << SPI_CSPIN_LCD);
    GPIO_REG(GPIO_OUTPUT_VAL)   &= ~(1 << SPI_CSPIN_LCD);
}

static int lcd_init(void) {
    int rv;

    rv = lcd_enable();
    if (rv) return rv;

    eos_sleep(200);

    rv = lcd_select();
    if (rv) {
        lcd_disable();
        return rv;
    }

    rv = ili9806e_init();
    if (rv == EOS_ERR_NOTFOUND) eve_lcd_set_absent(1);
    lcd_deselect();

    if (rv) lcd_disable();
    return rv;
}

static int lcd_reset(void) {
    int rv;

    if (!lcd_enabled()) return EOS_ERR;

    rv = lcd_disable();
    if (rv) return rv;

    eos_sleep(10);

    rv = lcd_init();
    if (rv) {
        lcd_enable();
        return rv;
    }

    return EOS_OK;
}

static int lcd_sleep(void) {
    int rv;

    rv = lcd_select();
    if (rv) return rv;

    ili9806e_sleep();
    lcd_deselect();

    rv = lcd_disable();
    return rv;
}

int eos_lcd_init(void) {
    uint8_t wakeup_cause;
    int rv, rst;

    if (!eos_egpio_get_val(EGPIO_PIN_DISP_SEL)) return EOS_ERR_BUSY;
    if (lcd_enabled()) return EOS_ERR;

    wakeup_cause = eos_pwr_wakeup_cause();
    rst = (wakeup_cause == EOS_PWR_WAKE_RST);
    if (rst) {
        rv = lcd_init();
    } else {
        rv = eos_lcd_wake();
    }

    return rv;
}

int eos_lcd_sleep(void) {
    int rv;

    if (!lcd_enabled()) return EOS_ERR;

    rv = lcd_sleep();
    return rv;
}

int eos_lcd_wake(void) {
    int rv;

    if (lcd_enabled()) return EOS_ERR;

    rv = lcd_init();
    return rv;
}

int eos_lcd_take(void) {
    return lcd_reset();
}

int eos_lcd_give(void) {
    return lcd_reset();
}