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Current tests
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‎firmware/chipignite/current/Makefile‎

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# Set the prefix for `riscvXX-unknown-elf-*`
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# On installations using `multilib`, this will be `riscv64` even for compiling to 32-bit targets
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TOOLCHAIN_PREFIX=riscv32-none-elf
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#TOOLCHAIN_PREFIX=riscv32
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# ARCH=rv32i
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ARCH=rv32i_zicsr
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# ---- Project Configuration ----
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SRCDIR = src
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INCDIR = include
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SOURCES = $(wildcard $(SRCDIR)/*.c)
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PROJECT = current
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# ---- Test patterns for project raven ----
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.SUFFIXES:
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hex: $(PROJECT).hex
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$(PROJECT).elf: $(SOURCES) ../sections.lds ../crt0_vex.S
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#$(TOOLCHAIN_PREFIX)-gcc -O0 -march=rv32i -Wl,-Bstatic,-T,../sections.lds,--strip-debug -ffreestanding -nostdlib -o $@ ../start.s ../print_io.c $<
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$(TOOLCHAIN_PREFIX)-gcc -I../ -I../generated/ -I$(INCDIR) -O0 -mabi=ilp32 -march=$(ARCH) -D__vexriscv__ -Wl,-Bstatic,-T,../sections.lds,--strip-debug -ffreestanding -nostdlib -o $@ ../crt0_vex.S ../isr.c ../stub.c $(SOURCES)
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$(TOOLCHAIN_PREFIX)-objdump -D $(PROJECT).elf > $(PROJECT).lst
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%.hex: %.elf
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$(TOOLCHAIN_PREFIX)-objcopy -O verilog $< $@
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sed -ie 's/@1000/@0000/g' $@
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%.bin: %.elf
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$(TOOLCHAIN_PREFIX)-objcopy -O binary $< $@
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client: client.c
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gcc client.c -o client
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flash: $(PROJECT).hex
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python3 ../util/caravel_hkflash.py $(PROJECT).hex
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flash2: $(PROJECT).hex
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python3 ../util/caravel_flash.py $(PROJECT).hex
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show_projectid:
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python3 ../util/caravel_projectid.py
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# ---- Clean ----
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clean:
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rm -f $(PROJECT).elf $(PROJECT).hex $(PROJECT).bin $(PROJECT).lst *.vvp *.vcd
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.PHONY: clean hex all flash
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‎firmware/chipignite/current/README.md‎

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‎firmware/chipignite/current/arduino/arduino.ino‎

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// Constants
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#define BAUD_RATE 9600
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// Variables
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String receivedData = "";
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unsigned long lastReceiveTime = 0;
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const unsigned long DISPLAY_TIMEOUT = 500; // ms
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void setup() {
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Serial.begin(BAUD_RATE); // Initialize serial communication with computer
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Serial1.begin(BAUD_RATE); // Initialize serial communication with chip
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Serial.println("Chip Serial Monitor Started");
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Serial.println("Waiting for data...");
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}
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void loop() {
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// Read data from the chip
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while (Serial1.available() > 0) {
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char inByte = Serial1.read();
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receivedData += inByte;
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lastReceiveTime = millis();
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}
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// Print complete messages after timeout
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if (receivedData.length() > 0 && (millis() - lastReceiveTime > DISPLAY_TIMEOUT)) {
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Serial.print("Received: ");
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// Print as ASCII
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Serial.print("ASCII: \"");
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Serial.print(receivedData);
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Serial.print("\" | HEX: ");
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// Print as HEX
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for (int i = 0; i < receivedData.length(); i++) {
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char c = receivedData.charAt(i);
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if (c < 0x10) Serial.print("0");
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Serial.print(c, HEX);
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Serial.print(" ");
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}
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Serial.println();
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receivedData = "";
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}
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// Send data to chip if entered in Serial Monitor
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if (Serial.available() > 0) {
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String input = Serial.readStringUntil('\n');
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Serial1.println(input);
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Serial.println("Sent: " + input);
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}
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}

‎firmware/chipignite/current/include/gpio.h‎

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/**
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* @file slip.h
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* @brief GPIO implementation header
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*
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* Provides functions to interface with the GPIO pins.
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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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/* Begin typedef declarations */
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/* Begin function prototype declarations */
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bool valid_pin(uint32_t pin);
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void gpio_set(uint32_t pin, bool value);
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void gpio_clear(uint32_t pin);
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void gpio_toggle(uint32_t pin);
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bool gpio_get(uint32_t pin);
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/* Begin inline function declarations */

‎firmware/chipignite/current/include/uart.h‎

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/**
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* @file uart.h
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* @brief Universal Asynchronous Receiver/Transmitter (UART) implementation header
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*
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* Provides functions to configure and use the UART for serial communication.
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*/
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#pragma once
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#include <stdint.h>
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#define UART_BAUD_RATE 9600
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#define CRYSTAL_CLK 10000000
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#define UART_CLKDIV ((CRYSTAL_CLK / UART_BAUD_RATE))
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/* Begin typedef declarations */
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/* Begin function prototype declarations */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define UART_EV_TX 0x1
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#define UART_EV_RX 0x2
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void uart_init(void);
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void uart_sync(void);
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void uart_write(uint8_t ch);
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uint8_t uart_read(void);
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int uart_read_available(void);
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int uart_write_available(void);
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#ifdef __cplusplus
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}
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#endif

‎firmware/chipignite/current/src/current.c‎

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#include <defs.h>
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#include <stub.h>
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#include <csr.h>
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#include "../include/slip.h"
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#include "../include/uart.h"
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#include "../include/gpio.h"
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#define ARRAY_SIZE 100
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// --------------------------------------------------------
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// Firmware routines
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// --------------------------------------------------------
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/** @brief Configure the IO pins
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*/
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void configure_io() {
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// ======= Useful GPIO mode values =============
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// GPIO_MODE_MGMT_STD_INPUT_NOPULL
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// GPIO_MODE_MGMT_STD_INPUT_PULLDOWN
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// GPIO_MODE_MGMT_STD_INPUT_PULLUP
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// GPIO_MODE_MGMT_STD_OUTPUT
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// GPIO_MODE_MGMT_STD_BIDIRECTIONAL
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// GPIO_MODE_MGMT_STD_ANALOG
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// GPIO_MODE_USER_STD_INPUT_NOPULL
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// GPIO_MODE_USER_STD_INPUT_PULLDOWN
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// GPIO_MODE_USER_STD_INPUT_PULLUP
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// GPIO_MODE_USER_STD_OUTPUT
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// GPIO_MODE_USER_STD_BIDIRECTIONAL
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// GPIO_MODE_USER_STD_ANALOG
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// ======= set each IO to the desired configuration =============
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// GPIO 0 is turned off to prevent toggling the debug pin; For debug, make this an output and
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// drive it externally to ground.
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reg_mprj_io_0 = GPIO_MODE_MGMT_STD_ANALOG;
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// Changing configuration for IO[1-4] will interfere with programming flash. if you change them,
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// You may need to hold reset while powering up the board and initiating flash to keep the process
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// configuring these IO from their default values.
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// SPI
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reg_mprj_io_1 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_2 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_3 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_4 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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// -------------------------------------------
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reg_mprj_io_5 = GPIO_MODE_MGMT_STD_INPUT_NOPULL; // UART Rx
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reg_mprj_io_6 = GPIO_MODE_MGMT_STD_OUTPUT; // UART Tx
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reg_mprj_io_7 = GPIO_MODE_MGMT_STD_INPUT_NOPULL; // Used for reset
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reg_mprj_io_8 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_9 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_10 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_11 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_12 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_13 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_14 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_15 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_16 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_17 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_18 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_19 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_20 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_21 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_22 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_23 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_24 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_25 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_26 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_27 = GPIO_MODE_MGMT_STD_INPUT_NOPULL;
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reg_mprj_io_28 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_29 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_30 = GPIO_MODE_MGMT_STD_OUTPUT; // High
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reg_mprj_io_31 = GPIO_MODE_MGMT_STD_OUTPUT; // Low
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reg_mprj_io_32 = GPIO_MODE_MGMT_STD_OUTPUT; // High
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reg_mprj_io_33 = GPIO_MODE_MGMT_STD_OUTPUT; // Controlled by the code
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reg_mprj_io_34 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_35 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_36 = GPIO_MODE_MGMT_STD_OUTPUT;
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reg_mprj_io_37 = GPIO_MODE_MGMT_STD_OUTPUT;
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// Initialize UART
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uart_init();
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// Initiate the serial transfer to configure IO
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reg_mprj_xfer = 1;
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while (reg_mprj_xfer == 1)
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;
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}
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/** @brief Delay in microseconds
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*
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* @param d Delay in microseconds.
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*/
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void delay(const int d) {
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/* Configure timer for a single-shot countdown */
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reg_timer0_config = 0;
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reg_timer0_data = d;
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reg_timer0_config = 1;
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// Loop, waiting for value to reach zero
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reg_timer0_update = 1; // latch current value
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while (reg_timer0_value > 0) { reg_timer0_update = 1; }
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}
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/** @brief Turn off the LED
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*/
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void led_off() { reg_gpio_out = 1; }
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/** @brief Turn on the LED
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*/
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void led_on() { reg_gpio_out = 0; }
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/** @brief Entry point
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*/
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void main() {
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// Initialize GPIO
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reg_gpio_mode1 = 1;
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reg_gpio_mode0 = 0;
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reg_gpio_ien = 1;
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reg_gpio_oe = 1;
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// Configure IO pins including UART pins
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configure_io();
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// Configure All LA probes as inputs to the cpu
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reg_la0_oenb = reg_la0_iena = 0x00000000; // [31:0]
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reg_la1_oenb = reg_la1_iena = 0x00000000; // [63:32]
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reg_la2_oenb = reg_la2_iena = 0x00000000; // [95:64]
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reg_la3_oenb = reg_la3_iena = 0x00000000; // [127:96]
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// write data to la output
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// reg_la0_data = 0x00;
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// reg_la1_data = 0x00;
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// reg_la2_data = 0x00;
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// reg_la3_data = 0x00;
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// read data from la input
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// data0 = reg_la0_data;
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// data1 = reg_la1_data;
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// data2 = reg_la2_data;
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// data3 = reg_la3_data;
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// Turn off all GPIO outputs
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reg_mprj_datah = 0x00000000; // Set all high pins (32-37) low
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reg_mprj_datal = 0x00000000; // Set all low pins (0-31) low
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// Define a static array of items initialized to zero
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static uint8_t zero_array[ARRAY_SIZE] = {0};
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// Main loop - echo received characters and blink LED and
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while (true) {
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// Set all GPIO pins to high
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for (uint32_t i = 0; i <= 37; i++) { gpio_set(i); }
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// Wait for 1 second
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delay(10000000);
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}
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}

‎firmware/chipignite/current/src/gpio.c‎

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#include "../include/gpio.h"
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#include <defs.h>
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/** @brief Set the value of a GPIO pin (high)
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*
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* @param pin The pin to set.
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* @param value The value to set the pin to.
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*/
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void gpio_set(uint32_t pin, bool value) {
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if (pin < 32) {
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// Register for low pins (0-31)
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reg_mprj_datal |= (1 << (pin % 32));
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} else if (pin <= 37) {
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// Register for high pins (32-37)
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reg_mprj_datah |= (1 << (pin % 32));
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}
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}
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/** @brief Clear the value of a GPIO pin (low)
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*
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* @param pin The pin to clear.
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*/
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void gpio_clear(uint32_t pin) {
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if (pin < 32) {
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// Register for low pins (0-31)
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reg_mprj_datal &= ~(1 << (pin % 32));
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} else if (pin <= 37) {
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// Register for high pins (32-37)
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reg_mprj_datah &= ~(1 << (pin % 32));
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}
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}
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/** @brief Toggle the value of a GPIO pin
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*
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* @param pin The pin to toggle.
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*/
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void gpio_toggle(uint32_t pin) {
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if (pin < 32) {
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// Register for low pins (0-31)
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reg_mprj_datal ^= (1 << (pin % 32));
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} else if (pin <= 37) {
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// Register for high pins (32-37)
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reg_mprj_datah ^= (1 << (pin % 32));
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}
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}
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/** @brief Get the value of a GPIO pin
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*
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* @param pin The pin to get.
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* @return The value of the pin.
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*/
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bool gpio_get(uint32_t pin) {
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if (pin < 32) {
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// Register for low pins (0-31)
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return (reg_mprj_datal & (1 << (pin % 32))) != 0;
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} else if (pin <= 37) {
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// Register for high pins (32-37)
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return (reg_mprj_datah & (1 << (pin % 32))) != 0;
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}
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return false;
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}

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