/*
 * 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 "verilog/dv/caravel/defs.h"
#include "verilog/dv/caravel/stub.c"

/*
	Wishbone Test:
		- Configures MPRJ lower 8-IO pins as outputs
		- Checks counter value through the wishbone port
*/
void clock(){
	// clock
	reg_la2_data = 0x00000001;
	reg_la2_data = 0x00000000;
	// end clock
}

void clean_lines(){
    reg_la0_data = 0x00000000;
    reg_la1_data = 0x00000000;
}

void add_value_to_register(uint32_t value, uint32_t selected_regsiter){

	reg_la0_data = (selected_regsiter << 3| 2 & 0x7);
	reg_la1_data = value;
}

void read_value_from_register(uint32_t selected_regsiter){

	reg_la0_data = (selected_regsiter << 3| 1 & 0x7);

}

#define reg_wb_register        (*(volatile uint32_t*)0x30000000)
#define reg_wb_reads           (*(volatile uint32_t*)0x30000004)
#define reg_wb_ecc_corrected   (*(volatile uint32_t*)0x30000008)

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_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_37 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_36 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_35 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_34 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_33 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_32 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_31 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_30 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_29 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_28 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_27 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_26 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_25 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_24 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_23 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_22 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_21 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_20 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_19 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_18 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_17 = GPIO_MODE_USER_STD_OUTPUT;
    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_OUTPUT;
    reg_mprj_io_13 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_12 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_11 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_10 = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_9  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_8  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_7  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_5  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_4  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_3  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_2  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_1  = GPIO_MODE_USER_STD_OUTPUT;
    reg_mprj_io_0  = GPIO_MODE_USER_STD_OUTPUT;

    reg_mprj_io_6  = GPIO_MODE_MGMT_STD_OUTPUT;


	reg_uart_clkdiv = 625;
	reg_uart_enable = 1;

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

	// Configure LA probes 
	// outputs from the cpu are inputs for my project denoted for been 0 
	// inputs to the cpu are outpus for my project denoted for been 1
	reg_la0_oenb = reg_la0_iena = 0x00000000;    // [31:0] 
	reg_la1_oenb = reg_la1_iena = 0x00000000;    // [63:32]
	reg_la2_oenb = reg_la2_iena = 0xFFFFFFFC;    // [95:64]
	reg_la3_oenb = reg_la3_iena = 0xFFFFFFFF;    // [127:96]

	
	// Flag start of the test 
	reg_mprj_datal = 0xAB400000;

	// clock and reset
	reg_la2_data = 0x00000003;
	reg_la2_data = 0x00000000;
	// end clock

    add_value_to_register(1, 30);
    clock();
    add_value_to_register(2, 0);
    clock();
    add_value_to_register(3, 1);
    clock();
    clean_lines();
    clock();
    // deactivate internal clock
    reg_la2_oenb = 0xFFFFFFFF;
    // data 0x1
    // partity bits 1000011

    //apply modification to the register
    reg_wb_register = 0x00000003;
    clock();
    // re enable clock
    reg_la2_oenb = 0xFFFFFFFC;

    read_value_from_register(30);
    clock();
    read_value_from_register(1);
    clock();

    clean_lines();
    clock();
    // deactivate internal clock
    reg_la2_oenb = 0xFFFFFFFF;
    // check registers file
    if (reg_wb_reads == 0x00000002){
        print("OK\n\n");
    }
    else{
        print("ERROR\n\n");
    }
    if (reg_wb_ecc_corrected == 0x00000001){
        print("OK\n\n");
    }
    else{
        print("ERROR\n\n");
    }

    clock();
    // re enable clock
    reg_la2_oenb = 0xFFFFFFFC;
    read_value_from_register(0);
    clock();
    
    reg_mprj_datal = 0xAB410000;
	print("\n");
	print("Monitor: Test 1 Passed\n\n");	// Makes simulation very long!
	reg_mprj_datal = 0xAB510000;
}