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[sw/cpu_test] added test to estimate bus timeout latency

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stnolting 2020-10-17 22:58:17 +02:00
parent 326444380a
commit d0c5385d8a
1 changed files with 21 additions and 1 deletions
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22
sw/example/cpu_test/main.c
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@ -240,7 +240,7 @@ int main() {
#if (PROBING_MEM_TEST == 1)
cnt_test++;
register uint32_t imem_probe_addr =SYSINFO_DSPACE_BASE;
register uint32_t imem_probe_addr = SYSINFO_DSPACE_BASE;
uint32_t imem_probe_cnt = 0;
while(1) {
@ -265,6 +265,26 @@ int main() {
#endif
// ----------------------------------------------------------
// Bus timeout latency estimation
// ----------------------------------------------------------
exception_handler_answer = 0xFFFFFFFF;
neorv32_uart_printf("BUS TIMEOUT: ");
// start timing
tmp_a = neorv32_cpu_csr_read(CSR_CYCLE);
// this will timeout
MMR_UNREACHABLE = 0;
// wait for timeout
while (exception_handler_answer == 0xFFFFFFFF);
tmp_a = neorv32_cpu_csr_read(CSR_CYCLE) - tmp_a;
tmp_a = tmp_a / 4; // divide by average CPI
neorv32_uart_printf("~%u cycles\n", tmp_a);
// ----------------------------------------------------------
// External memory interface test
// ----------------------------------------------------------