verilog/dv/i2c_test/i2c_test.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
 */

// 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.

        // Program description : Read 4 bytes from a spi flash and check if its correct.
/*
	reg_mprj_io_34 =  GPIO_MODE_USER_STD_OUTPUT;  //uart txd

	reg_mprj_io_35 =  GPIO_MODE_USER_STD_INPUT_PULLUP;  // uart_rxd
	
	// spi configurations
	
       reg_mprj_io_20 =  GPIO_MODE_USER_STD_OUTPUT;   // slave select 0
	reg_mprj_io_21 =  GPIO_MODE_USER_STD_OUTPUT;   // slave select 1
	reg_mprj_io_22 =  GPIO_MODE_USER_STD_OUTPUT;   // serial clock
	reg_mprj_io_24 =  GPIO_MODE_USER_STD_OUTPUT;  //mosi
 
       reg_mprj_io_23 =  GPIO_MODE_USER_STD_INPUT_PULLUP;  //miso
       
       
*/	


	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;
	
	reg_mprj_io_8 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_9 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_10 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_11 =  GPIO_MODE_USER_STD_OUTPUT;
	
	reg_mprj_io_12 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_13 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_14 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_15 =  GPIO_MODE_USER_STD_OUTPUT;
	
	reg_mprj_io_16 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_17 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_18 =  GPIO_MODE_USER_STD_OUTPUT;
	reg_mprj_io_19 =  GPIO_MODE_USER_STD_OUTPUT;

reg_mprj_io_26 =  GPIO_MODE_USER_STD_BIDIRECTIONAL;
	reg_mprj_io_25 =  GPIO_MODE_USER_STD_OUTPUT;


	
	/* Apply configuration */
	reg_mprj_xfer = 1;
	
	while (reg_mprj_xfer == 1);
	
	
	unsigned char d0,d1,d2,d3;
	
       int  *i2c_dtr    = (int*)   0x30020010;   // i2c control register
       int  *i2c_drr    = (int*)   0x30020014;   // i2c data transmit register
       int  *i2c_cr     = (int*)    0x30020000;   // i2c status register 0 
       int  *i2c_sr0    = (int*)    0x30020004;   // i2c status register 1
       int  *i2c_sr1    = (int*)    0x30020008;
       int i2cSR1,i2cSR0;
	
	
        
        int  *gpo_addr =  (int*) 0x30050000; // gpio out address
        int  *gpd_addr =  (int*) 0x3005000C; // gpio dir address
        int  *gpi_addr =  (int*) 0x30050004; // gpio dir address
        int  *reset_addr =  (int*) 0x3008001C; // reset address
        
        *reset_addr   = 0x00000000;
        *reset_addr   = 0x00000000;
        *reset_addr   = 0x00000000;
        *reset_addr   = 0x00000001;
        
        *gpd_addr  = 0x00000000; // setting all 20 gpio pins as output
        *gpo_addr  = 0x00000000; // all gpo ports set to 0
        
        *i2c_cr  = 0x01; // writing start sequence
        *i2c_dtr = 0xBE; // write to 24AA62 eeprom ic (addressing)
        
       // checking for transmission complete
       do {
		i2cSR0  = *i2c_sr0;
		i2cSR0 = i2cSR0 & 0x00000010;
          }   while (i2cSR0 != 0x00000010);
          
       i2cSR1 = *i2c_sr1 ;
       i2cSR1 = i2cSR1 & 0x01;
       
       if( i2cSR1 == 0x00000001) { while(1); } // nack received loop here
         
       *gpo_addr = 0x000ABCDE;  // success sequence test in test bench
      
       
        while(1);
      

}