verilog/dv/caravel/user_proj_example/io_ports/io_ports.c

/*
 * 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
 */

#include "../../defs.h"

/*
	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       |

	*/

	// GPIOs
	reg_mprj_io_0 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_1 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_2 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_3 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_4 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_5 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_6 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_7 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;

	reg_mprj_io_8  =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_9  =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_10 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_11 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_12 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_13 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;

	// Flash
	reg_mprj_io_14 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_15 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_16 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_17 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;

	// Flash CLK and Enable
	reg_mprj_io_18 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_19 =  GPIO_MODE_USER_STD_OUTPUT;

	// UART 0
	reg_mprj_io_20 =  GPIO_MODE_USER_STD_INPUT_NOPULL;
	reg_mprj_io_21 =  GPIO_MODE_USER_STD_OUTPUT;

	// UART 1
	reg_mprj_io_22 =  GPIO_MODE_USER_STD_INPUT_NOPULL;
	reg_mprj_io_23 =  GPIO_MODE_USER_STD_OUTPUT;

	// SPI0
	reg_mprj_io_24 =  GPIO_MODE_USER_STD_INPUT_NOPULL;
	reg_mprj_io_25 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_26 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_27 =  GPIO_MODE_USER_STD_OUTPUT;

	// SPI1
	reg_mprj_io_28 =  GPIO_MODE_USER_STD_INPUT_NOPULL;
	reg_mprj_io_29 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_30 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_31 =  GPIO_MODE_USER_STD_OUTPUT;

	// I2C0
	reg_mprj_io_32 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_33 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	
	// I2C1
	reg_mprj_io_34 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_35 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;

	// PWM
	reg_mprj_io_36 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_37 =  GPIO_MODE_USER_STD_OUTPUT;

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

	// Logic probes: configure LA[9:0] as outputs from the mgmt area
	/*
		LA      | EL2

		la[1]   | NMI     | 1'b0
		la[0]   | HResetn | 1'b1
	*/
	reg_la0_ena = 0x00000000;  
	reg_la0_data = 0x01;

}