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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);
}