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/*
A low-level stress test of SRAM functionality. Uses slow-ish timing
by default (DATAST = ADDSET = 0xF).
Copyright 2011 LeafLabs, LLC.
This code is released into the public domain.
*/
#include <stdio.h>
#include <stddef.h>
#include <wirish/wirish.h>
#include <libmaple/rcc.h>
#include <libmaple/fsmc.h>
// -- SRAM config -------------------------------------------------------------
// Timing configuration
#define DATAST 0xF
#define ADDSET 0xF
// Number of SRAM chips to test
#define N 1
// How much of each to test
#define MEM_SIZE 0x3FFF
// Their start addresses in FSMC bank 1
__io uint16 *const starts[N] = {
// (__io uint16 *const)FSMC_NOR_PSRAM_REGION1,
// (__io uint16 *const)FSMC_NOR_PSRAM_REGION2,
(__io uint16 *const)FSMC_NOR_PSRAM_REGION3,
// (__io uint16 *const)FSMC_NOR_PSRAM_REGION4,
};
// Corresponding FSMC configuration registers
__io uint32 *const bcrs[N] = {
// &FSMC_NOR_PSRAM1_BASE->BCR,
// &FSMC_NOR_PSRAM2_BASE->BCR,
&FSMC_NOR_PSRAM3_BASE->BCR,
// &FSMC_NOR_PSRAM4_BASE->BCR,
};
// Corresponding FSMC timing registers
__io uint32 *const btrs[N] = {
// &FSMC_NOR_PSRAM1_BASE->BTR,
// &FSMC_NOR_PSRAM2_BASE->BTR,
&FSMC_NOR_PSRAM3_BASE->BTR,
// &FSMC_NOR_PSRAM4_BASE->BTR,
};
// -- Pseudorandom number generation -----------------------------------------
const uint32 seed = 0xDEADBEEF;
uint32 num_rand_calls = 0;
uint32 rand(long n) {
num_rand_calls++;
return random(n);
}
// -- Printing ----------------------------------------------------------------
// For snprintf()
char snprintf_buf[200];
#define ERR(fmt, ...) do { \
snprintf(snprintf_buf, sizeof snprintf_buf, \
"ERROR: " fmt " (seed %d, ncalls %d, line %d)", \
__VA_ARGS__, seed, num_rand_calls, __LINE__); \
SerialUSB.println(snprintf_buf); \
} while (0)
// Set to 1 for more output
#define VERBOSE 0
// -- setup()/loop() ----------------------------------------------------------
void setup() {
fsmc_sram_init_gpios();
rcc_clk_enable(RCC_FSMC);
for (int i = 0; i < N; i++) {
*bcrs[i] = (FSMC_BCR_WREN |
FSMC_BCR_MTYP_SRAM |
FSMC_BCR_MWID_16BITS |
FSMC_BCR_MBKEN);
*btrs[i] = (DATAST << 8) | ADDSET;
}
randomSeed(seed);
SerialUSB.read();
SerialUSB.println("Starting test");
}
// stress_test() and simple_roundtrip() are the available test routines
bool stress_test(void);
bool simple_roundtrip(void);
void loop() {
uint32 last;
last = millis();
while (true) {
if (!stress_test()) {
SerialUSB.println("Halting due to error.");
throb();
} else {
uint32 now = millis();
if (now - last > 500) {
snprintf(snprintf_buf, sizeof snprintf_buf,
"everything ok so far, timestamp %d ms", now);
SerialUSB.println(snprintf_buf);
last = now;
}
}
}
}
// -- Test routines -----------------------------------------------------------
bool random_trips();
bool sequential_trips();
bool stress_test(void) {
static int i = 0;
i = !i;
switch (i) {
case 0:
return random_trips();
default:
return sequential_trips();
}
}
bool simple_roundtrip(void) {
uint16 wval = 0xAB;
for (int i = 0; i < N; i++) {
__io uint16 *addr = starts[i] + 4;
snprintf(snprintf_buf, sizeof snprintf_buf, "round-trip 0x%x at %p",
wval, addr);
SerialUSB.println(snprintf_buf);
*addr = wval;
uint16 rval = *addr;
if (rval != wval) {
ERR("wrote 0x%x, read 0x%x, timestamp %d", wval, rval, millis());
return false;
} else {
snprintf(snprintf_buf, sizeof snprintf_buf, "got back 0x%x", rval);
SerialUSB.println(snprintf_buf);
}
}
return true;
}
bool random_trips(void) {
#if VERBOSE
SerialUSB.println("[random]");
#endif
for (int n = 0; n < N; n++) {
__io uint16 *const start = starts[n];
for (int i = 0; i < 1000; i++) {
uint32 offset = rand(MEM_SIZE);
uint32 wval = rand(0xFFFF);
*(start + offset) = wval;
uint32 rval = *(start + offset);
if (rval != wval) {
ERR("wrote 0x%x to 0x%x, read 0x%x", wval, offset, rval);
return false;
}
}
}
return true;
}
bool sequential_trips(void) {
static const uint32 seq_length = 300;
#if VERBOSE
SerialUSB.println("[seq]");
#endif
for (int n = 0; n < N; n++) {
__io uint16 *const start = starts[n];
for (int i = 0; i < 100; i++) {
uint32 start_offset = rand(MEM_SIZE - seq_length);
for (uint32 w = 0; w < seq_length; w++) {
uint32 offset = start_offset + w;
*(start + offset) = w;
uint32 r = *(start + offset);
if (w != r) {
ERR("wrote 0x%x to 0x%x, read 0x%x", w, offset, r);
return false;
}
}
}
}
return true;
}
// ----------------------------------------------------------------------------
__attribute__((constructor)) void premain() {
init();
}
int main(void) {
setup();
while (true) {
loop();
}
return 0;
}
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