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/*

 * 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"

/*

        IO Test:

                - Configures MPRJ lower 8-IO pins as outputs

                - Observes counter value through the MPRJ lower 8 IO pins (in the testbench)

*/

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.

        // Configure lower 8-IOs as user output

        // Observe counter value in the testbench

        reg_mprj_io_0 =  GPIO_MODE_USER_STD_OUTPUT;

        reg_mprj_io_1 =  GPIO_MODE_USER_STD_OUTPUT;

        reg_mprj_io_2 =  GPIO_MODE_USER_STD_OUTPUT;

        reg_mprj_io_3 =  GPIO_MODE_USER_STD_OUTPUT;

        reg_mprj_io_4 =  GPIO_MODE_USER_STD_OUTPUT;

        reg_mprj_io_5 =  GPIO_MODE_USER_STD_OUTPUT;

        reg_mprj_io_6 =  GPIO_MODE_USER_STD_OUTPUT;

        reg_mprj_io_7 =  GPIO_MODE_USER_STD_OUTPUT;

        /* Apply configuration */

        reg_mprj_xfer = 1;

        while (reg_mprj_xfer == 1);

}