/*
 * SPDX-FileCopyrightText: 2020 Efabless Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * SPDX-License-Identifier: Apache-2.0
 */

// This include is relative to $CARAVEL_PATH (see Makefile)
#include <defs.h>
#include "seed.h"
#include <stub.c>

/*
    Wishbone Test:
        - Configures MPRJ lower 8-IO pins as outputs
        - Checks counter value through the wishbone port
*/

#define reg_SRAM ((volatile uint32_t *)0x30000000)
//#define WRITE_MASTER_KEY

void main()
{

    /*
    IO Control Registers
    | DM     | VTRIP | SLOW  | AN_POL | AN_SEL | AN_EN | MOD_SEL | INP_DIS | HOLDH | OEB_N | MGMT_EN |
    | 3-bits | 1-bit | 1-bit | 1-bit  | 1-bit  | 1-bit | 1-bit   | 1-bit   | 1-bit | 1-bit | 1-bit   |
    Output: 0000_0110_0000_1110  (0x1808) = GPIO_MODE_USER_STD_OUTPUT
    | DM     | VTRIP | SLOW  | AN_POL | AN_SEL | AN_EN | MOD_SEL | INP_DIS | HOLDH | OEB_N | MGMT_EN |
    | 110    | 0     | 0     | 0      | 0      | 0     | 0       | 1       | 0     | 0     | 0       |


    Input: 0000_0001_0000_1111 (0x0402) = GPIO_MODE_USER_STD_INPUT_NOPULL
    | DM     | VTRIP | SLOW  | AN_POL | AN_SEL | AN_EN | MOD_SEL | INP_DIS | HOLDH | OEB_N | MGMT_EN |
    | 001    | 0     | 0     | 0      | 0      | 0     | 0       | 0       | 0     | 1     | 0       |
    */

    /* Set up the housekeeping SPI to be connected internally so	*/
    /* that external pin changes don't affect it.			*/

    reg_spi_enable = 1;
    reg_wb_enable = 1;
    // reg_spimaster_config = 0xa002;	// Enable, prescaler = 2,
    // connect to housekeeping SPI

    // Connect the housekeeping SPI to the SPI master
    // so that the CSB line is not left floating.  This allows
    // all of the GPIO pins to be used for user functions.

    reg_mprj_io_31 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_30 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_29 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_28 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_27 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_26 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_25 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_24 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_23 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_22 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_21 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_20 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_19 = GPIO_MODE_MGMT_STD_OUTPUT;
    reg_mprj_io_18 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_17 = GPIO_MODE_USER_STD_INPUT_NOPULL;
    // reg_mprj_io_16 = GPIO_MODE_USER_STD_OUTPUT;
    

    // reg_mprj_io_15 = GPIO_MODE_USER_STD_OUTPUT;
    // reg_mprj_io_14 = GPIO_MODE_USER_STD_INPUT_NOPULL;


    //set the alarm
    *(reg_SRAM + 3) = 0;

    // read status reg until alarm is detected
    while(*(reg_SRAM +2) == 0);


    // reg_mprj_io_14 = GPIO_MODE_MGMT_STD_OUTPUT;


    // The following lines should cause to reset alarm bit by rewriting to master_key register
    volatile unsigned dummy;
    bool error = false;
    //writing to master key
    #ifdef WRITE_MASTER_KEY
    *(reg_SRAM) = 0xDEADBEEF;
    *(reg_SRAM) = 0xCAFEBEEF;
    *(reg_SRAM) = 0x01234567;
    *(reg_SRAM) = 0x89abcdef;
    #endif
    

    /* Apply configuration */
    reg_mprj_xfer = 1;
    while (reg_mprj_xfer == 1)
        ;

    reg_la2_oenb = reg_la2_iena = 0x00000000; // [95:64]

    // Flag start of the test
    reg_mprj_datal = 0xAB600000;

    
    if((*(reg_SRAM +2) & 0x00000004) == 1)
        reg_mprj_datal = 0xAB800000;
    else
        reg_mprj_datal = 0xAB700000;
}