MSP432 LaunchPad demo'ing TI logo on I2C OLED display

oledi2c_v2.c

/*
 * Copyright (c) 2015-2017, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *  ======== empty.c ========
 */

/* For usleep() */
#include <unistd.h>
#include <stdint.h>
#include <stddef.h>

/* XDC module Headers */
#include <xdc/std.h>
#include <xdc/runtime/System.h>
#include <xdc/runtime/Memory.h>
#include <xdc/runtime/Error.h>

/* TI-RTOS kernel */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Clock.h>
#include <ti/sysbios/knl/Task.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/I2C.h>
// #include <ti/drivers/SDSPI.h>
// #include <ti/drivers/SPI.h>
// #include <ti/drivers/UART.h>
// #include <ti/drivers/Watchdog.h>

/* Board Header file */
#include "Board.h"

/*
 *  ======== mainThread ========
 */

#define SSD1306_OLED_SLAVE_ADDRESS 0x3C  // 011110<0><R/W#>
Bool ssd1306_command(I2C_Handle i2c, UInt8 cmd);
Bool ssd1306_writedata(I2C_Handle i2c, Void * data, size_t count);
Void ssd1306_clearScreen(I2C_Handle i2c);

void *mainThread(void *arg0)
{
    /* Call driver init functions */
    GPIO_init();
    I2C_init();
    // SDSPI_init();
    // SPI_init();
    // UART_init();
    // Watchdog_init();

    I2C_Params iP;
    I2C_Handle i2c;

    I2C_Params_init(&iP);
    iP.bitRate = I2C_400kHz;
    iP.transferMode = I2C_MODE_BLOCKING;
    i2c = I2C_open(Board_I2C1, &iP);
    if (i2c == NULL) {
        System_abort("I2C_open failed\n");
    }

    // Wait 10ms
    Task_sleep(10000 / Clock_tickPeriod);
    System_printf("Beginning OLED init-\n"); System_flush();

    // Initialize SSD1306
    UInt8 ssd1306_init0_sequence[] = {
        0xAE,
        0xD5,
        0x80,
        0xA8,
        63,
        0xD3,
        0x00,
        0x40,
        0x8D,
        0x14,
        0x20,
        0x02, // PAGE ADDRESSING MODE
        0xA1,
        0xC8,
        0xDA,
        0x12,
        0x81,
        0xCF,
        0xD9,
        0xF1,
        0xDB,
        0x40,
        0xA4,
        0xA6
    };

    Int i;
    for (i=0; i < sizeof(ssd1306_init0_sequence); i++) {
        ssd1306_command(i2c, ssd1306_init0_sequence[i]);
    }
    ssd1306_clearScreen(i2c);
    ssd1306_command(i2c, 0xAF);  // DISPLAYON
    System_printf("done\n"); System_flush();
    Task_sleep(250000 / Clock_tickPeriod);

    // Set page address = 0
    System_printf("Writing logo-\n"); System_flush();
    UInt8 txn_logo[] = {0x40, 0x08, 0x18, 0x38, 0x3F, 0x1F, 0x3F, 0x44, 0xF6, 0x3C, 0x1C, 0x18, 0x00};
    for (i=0; i < 8; i++) {
        ssd1306_command(i2c, 0xB0 | i);
        ssd1306_command(i2c, 0x00);
        ssd1306_command(i2c, 0x10);
        ssd1306_writedata(i2c, txn_logo, 12);
    }
    System_printf("done\n"); System_flush();

    while (1) {
        GPIO_write(Board_GPIO_LED1, !GPIO_read(Board_GPIO_LED1));
        Task_sleep(250000 / Clock_tickPeriod);
    }
}

Bool ssd1306_command(I2C_Handle i2c, UInt8 cmd)
{
    UInt8 buf[2];

    buf[0] = 0;
    buf[1] = cmd;
    return ssd1306_writedata(i2c, &buf[0], 2);
}

Bool ssd1306_writedata(I2C_Handle i2c, Void * data, size_t count) // Needs to include a 0x40 at the very beginning
{
    I2C_Transaction txn;

    txn.writeBuf = (void *)data;
    txn.writeCount = count;
    txn.readCount = 0;
    txn.readBuf = NULL;
    txn.slaveAddress = SSD1306_OLED_SLAVE_ADDRESS;
    return I2C_transfer(i2c, &txn);
}

Void ssd1306_clearScreen(I2C_Handle i2c)
{
    UInt8 buf[129];
    Int i;
    I2C_Transaction txn;

    txn.writeBuf = (void *)buf;
    txn.writeCount = 129;
    txn.readCount = 0;
    txn.readBuf = NULL;
    txn.slaveAddress = SSD1306_OLED_SLAVE_ADDRESS;

    buf[0] = 0x40;
    for (i=1; i < 129; i++) {
        buf[i] = 255;
    }

    for (i=0; i < 8; i++) {
        ssd1306_command(i2c, 0xB0 | i);
        ssd1306_command(i2c, 0x00);
        ssd1306_command(i2c, 0x10);
        I2C_transfer(i2c, &txn);
    }
}