155 lines
7.6 KiB
C
155 lines
7.6 KiB
C
// #################################################################################################
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// # << NEORV32 - Newlib Demo/Test Program >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2022, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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// #################################################################################################
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/**********************************************************************//**
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* @file demo_newlib/main.c
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* @author Stephan Nolting
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* @brief Demo/test program for NEORV32's newlib C standard library support.
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**************************************************************************/
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#include <neorv32.h>
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#include <unistd.h>
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#include <stdlib.h>
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/**********************************************************************//**
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* @name User configuration
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**************************************************************************/
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/**@{*/
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/** UART BAUD rate */
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#define BAUD_RATE 19200
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/**@}*/
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/**********************************************************************//**
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* @name Max heap size (from linker script's "__neorv32_heap_size")
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**************************************************************************/
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extern const unsigned __crt0_max_heap;
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/**********************************************************************//**
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* Main function: Check some of newlib's core functions.
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*
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* @note This program requires UART0.
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*
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* @return 0 if execution was successful
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**************************************************************************/
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int main() {
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// setup NEORV32 runtime environment to keep us safe
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// -> catch all traps and give debug information via UART0
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neorv32_rte_setup();
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// setup UART0 at default baud rate, no parity bits, no HW flow control
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neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
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// check if UART0 is implemented at all
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if (neorv32_uart0_available() == 0) {
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neorv32_uart0_printf("Error! UART0 not synthesized!\n");
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return 1;
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}
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// say hello
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neorv32_uart0_printf("<<< Newlib demo/test program >>>\n\n");
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// heap size definition
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volatile uint32_t max_heap = (uint32_t)&__crt0_max_heap;
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if (max_heap > 0){
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neorv32_uart0_printf("MAX heap size: %u bytes\n", max_heap);
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}
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else {
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neorv32_uart0_printf("ERROR! No heap size defined (linker script -> '__neorv32_heap_size')!\n");
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return -1;
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}
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// check if newlib is really available
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#ifndef __NEWLIB__
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neorv32_uart0_printf("ERROR! Seems like the compiler toolchain does not support newlib...\n");
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return -1;
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#endif
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neorv32_uart0_printf("newlib version %i.%i\n\n", (int32_t)__NEWLIB__, (int32_t)__NEWLIB_MINOR__);
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neorv32_uart0_printf("<rand> test... ");
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srand(neorv32_cpu_csr_read(CSR_CYCLE)); // set random seed
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neorv32_uart0_printf("%i, %i, %i, %i\n", rand() % 100, rand() % 100, rand() % 100, rand() % 100);
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char *char_buffer; // pointer for dynamic memory allocation
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neorv32_uart0_printf("<malloc> test...\n");
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char_buffer = (char *) malloc(4 * sizeof(char)); // 4 bytes
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// do not test read & write in simulation as there would be no UART RX input
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if (NEORV32_SYSINFO.SOC & (1<<SYSINFO_SOC_IS_SIM)) {
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neorv32_uart0_printf("Skipping <read> & <write> tests as this seems to be a simulation.\n");
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}
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else {
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neorv32_uart0_printf("<read> test (waiting for 4 chars via UART0)... ");
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read((int)STDIN_FILENO, char_buffer, 4 * sizeof(char)); // get 4 chars from "STDIN" (UART0.RX)
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neorv32_uart0_printf("ok\n");
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neorv32_uart0_printf("<write> test to 'STDOUT'... (outputting the chars you have send)\n");
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write((int)STDOUT_FILENO, char_buffer, 4 * sizeof(char)); // send 4 chars to "STDOUT" (UART0.TX)
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neorv32_uart0_printf("\nok\n");
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neorv32_uart0_printf("<write> test to 'STDERR'... (outputting the chars you have send)\n");
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write((int)STDERR_FILENO, char_buffer, 4 * sizeof(char)); // send 4 chars to "STDERR" (UART0.TX)
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neorv32_uart0_printf("\nok\n");
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}
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neorv32_uart0_printf("<free> test...\n");
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free(char_buffer);
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// NOTE: exit is highly over-sized as it also includes clean-up functions (destructors), which
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// are not required for bare-metal or RTOS applications... better use the simple 'return' or even better
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// make sure main never returns. Anyway, let's check if 'exit' works.
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neorv32_uart0_printf("<exit> test...");
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exit(0);
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return 0; // should never be reached
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}
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/**********************************************************************//**
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* "after-main" handler that is executed after the application's
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* main function returns (called by crt0.S start-up code)
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**************************************************************************/
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void __neorv32_crt0_after_main(int32_t return_code) {
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neorv32_uart0_printf("\n<RTE> main function returned with exit code %i </RTE>\n", return_code);
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}
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