202 lines
8.3 KiB
C
202 lines
8.3 KiB
C
// #################################################################################################
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// # << NEORV32 - SLINK Demo Program >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2023, 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_slink/main.c
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* @author Stephan Nolting
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* @brief SLINK demo program.
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**************************************************************************/
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#include <neorv32.h>
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#include <string.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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// Prototypes
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void slink_rx_firq_handler(void);
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void slink_tx_firq_handler(void);
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uint32_t xorshift32(void);
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/**********************************************************************//**
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* Simple SLINK demo program.
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*
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* @note This program requires the UART0 and the SLINK to be synthesized.
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*
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* @return =! 0 if execution failed.
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**************************************************************************/
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int main() {
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int i;
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uint32_t slink_data;
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int slink_status;
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// capture all exceptions and give debug info 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 unit is implemented at all
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if (neorv32_uart0_available() == 0) {
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return -1; // abort if not implemented
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}
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// intro
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neorv32_uart0_printf("\n<<< SLINK Demo Program >>>\n\n");
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// check if SLINK is implemented at all
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if (neorv32_slink_available() == 0) {
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neorv32_uart0_printf("ERROR! SLINK module not implemented.");
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return -1;
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}
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// show SLINK hardware configuration
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neorv32_uart0_printf("# SLINK RX channels: %u (%u FIFO entries each)\n"
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"# SLINK TX channels: %u (%u FIFO entries each)\n",
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neorv32_slink_get_link_num(0),
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neorv32_slink_get_fifo_depth(0),
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neorv32_slink_get_link_num(1),
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neorv32_slink_get_fifo_depth(1));
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neorv32_uart0_printf("\nNOTE: This demo program uses SLINK RX/TX channels 0 only.\n\n");
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// reset and enable SLINK module
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neorv32_slink_setup((0b10 << (SLINK_IRQ_RX_LSB + 2*0)) | // RX link 0: IRQ if FIFO becomes not empty
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(0b11 << (SLINK_IRQ_TX_LSB + 2*0))); // TX link 0: IRQ if FIFO becomes less than half full
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// NEORV32 runtime environment: install SLINK FIRQ handlers
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neorv32_rte_handler_install(SLINK_RX_RTE_ID, slink_rx_firq_handler);
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neorv32_rte_handler_install(SLINK_TX_RTE_ID, slink_tx_firq_handler);
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neorv32_cpu_csr_set(CSR_MIE, 1 << SLINK_RX_FIRQ_ENABLE); // enable SLINK RX FIRQ
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neorv32_cpu_csr_set(CSR_MIE, 1 << SLINK_TX_FIRQ_ENABLE); // enable SLINK RX FIRQ
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neorv32_cpu_csr_set(CSR_MSTATUS, 1 << CSR_MSTATUS_MIE); // enable machine-mode interrupts
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// do some demo transmissions
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neorv32_uart0_printf("-------- TX Demo --------\n");
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for (i=0; i<6; i++) { // try to send 6 data words
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slink_data = xorshift32();
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neorv32_uart0_printf("%i: SLINK TX 0x%x via link 0... ", i, slink_data);
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if (i == 3) {
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neorv32_uart0_printf("[set END-OF-PACKET] ");
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slink_status = neorv32_slink_tx(0, slink_data, 1); // do a "end of packet" transmission (set LST high)
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}
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else {
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slink_status = neorv32_slink_tx(0, slink_data, 0); // "normal" transmission
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}
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if (slink_status == 0) { // successful?
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neorv32_uart0_printf("ok\n");
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}
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else {
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neorv32_uart0_printf("fail; FIFO full\n");
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}
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}
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// check the RX link
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neorv32_uart0_printf("\n-------- RX Demo --------\n");
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for (i=0; i<6; i++) { // try to read 6 data words
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slink_data = 0;
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neorv32_uart0_printf("%i: SLINK RX link 0... ", i);
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slink_status = neorv32_slink_rx(0, &slink_data);
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if (slink_status == 0) {
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neorv32_uart0_printf("received 0x%x\n", slink_data);
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}
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else if (slink_status == 1) {
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neorv32_uart0_printf("received 0x%x [END-OF-PACKET]\n", slink_data);
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}
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else { // == -1
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neorv32_uart0_printf("no data available\n");
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}
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}
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neorv32_uart0_printf("\nProgram execution completed.\n");
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return 0;
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}
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/**********************************************************************//**
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* SLINK RX interrupt handler.
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**************************************************************************/
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void slink_rx_firq_handler(void) {
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neorv32_cpu_csr_write(CSR_MIP, ~(1 << SLINK_RX_FIRQ_PENDING)); // ack FIRQ
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neorv32_uart0_printf(" <<SLINK RX IRQ!>> ");
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}
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/**********************************************************************//**
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* SLINK TX interrupt handler.
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**************************************************************************/
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void slink_tx_firq_handler(void) {
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neorv32_cpu_csr_write(CSR_MIP, ~(1 << SLINK_TX_FIRQ_PENDING)); // ack FIRQ
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neorv32_uart0_printf(" <<SLINK TX IRQ!>> ");
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}
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/**********************************************************************//**
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* Simple pseudo random number generator.
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*
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* @return Random number.
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**************************************************************************/
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uint32_t xorshift32(void) {
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static uint32_t x32 = 314159265;
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x32 ^= x32 << 13;
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x32 ^= x32 >> 17;
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x32 ^= x32 << 5;
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return x32;
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}
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