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// #################################################################################################
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// #################################################################################################
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// # << NEORV32: neorv32_mtime.c - Machine System Timer (MTIME) HW Driver >> #
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// # << NEORV32: neorv32_mtime.c - Machine System Timer (MTIME) HW Driver >> #
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// # ********************************************************************************************* #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # BSD 3-Clause License #
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// # #
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// # #
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// # Copyright (c) 2021, Stephan Nolting. All rights reserved. #
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// # Copyright (c) 2022, Stephan Nolting. All rights reserved. #
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// # #
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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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// # 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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// # permitted provided that the following conditions are met: #
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// # #
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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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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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**************************************************************************/
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**************************************************************************/
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void neorv32_mtime_set_time(uint64_t time) {
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void neorv32_mtime_set_time(uint64_t time) {
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union {
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union {
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uint64_t uint64;
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uint64_t uint64;
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uint32_t uint32[sizeof(uint64_t)/2];
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uint32_t uint32[sizeof(uint64_t)/sizeof(uint32_t)];
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} cycles;
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} cycles;
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cycles.uint64 = time;
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cycles.uint64 = time;
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NEORV32_MTIME.TIME_LO = 0;
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NEORV32_MTIME.TIME_LO = 0;
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**************************************************************************/
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**************************************************************************/
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uint64_t neorv32_mtime_get_time(void) {
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uint64_t neorv32_mtime_get_time(void) {
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union {
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union {
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uint64_t uint64;
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uint64_t uint64;
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uint32_t uint32[sizeof(uint64_t)/2];
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uint32_t uint32[sizeof(uint64_t)/sizeof(uint32_t)];
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} cycles;
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} cycles;
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uint32_t tmp1, tmp2, tmp3;
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uint32_t tmp1, tmp2, tmp3;
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while(1) {
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while(1) {
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tmp1 = NEORV32_MTIME.TIME_HI;
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tmp1 = NEORV32_MTIME.TIME_HI;
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**************************************************************************/
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**************************************************************************/
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void neorv32_mtime_set_timecmp(uint64_t timecmp) {
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void neorv32_mtime_set_timecmp(uint64_t timecmp) {
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union {
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union {
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uint64_t uint64;
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uint64_t uint64;
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uint32_t uint32[sizeof(uint64_t)/2];
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uint32_t uint32[sizeof(uint64_t)/sizeof(uint32_t)];
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} cycles;
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} cycles;
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cycles.uint64 = timecmp;
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cycles.uint64 = timecmp;
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NEORV32_MTIME.TIMECMP_LO = -1; // prevent MTIMECMP from temporarily becoming smaller than the lesser of the old and new values
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NEORV32_MTIME.TIMECMP_LO = -1; // prevent MTIMECMP from temporarily becoming smaller than the lesser of the old and new values
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**************************************************************************/
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**************************************************************************/
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uint64_t neorv32_mtime_get_timecmp(void) {
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uint64_t neorv32_mtime_get_timecmp(void) {
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union {
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union {
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uint64_t uint64;
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uint64_t uint64;
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uint32_t uint32[sizeof(uint64_t)/2];
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uint32_t uint32[sizeof(uint64_t)/sizeof(uint32_t)];
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} cycles;
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} cycles;
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cycles.uint32[0] = NEORV32_MTIME.TIMECMP_LO;
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cycles.uint32[0] = NEORV32_MTIME.TIMECMP_LO;
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cycles.uint32[1] = NEORV32_MTIME.TIMECMP_HI;
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cycles.uint32[1] = NEORV32_MTIME.TIMECMP_HI;
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