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After various memory exercises, then back to GPS to get UBlox working. UBlox is working. TODO: start libraries, downplay SD Card as we can use memory for interim logging

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This commit is contained in:
John Poole 2026-04-04 11:52:41 -07:00
commit 41c1fe6819
16 changed files with 2016 additions and 71 deletions
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55
exercises/15_RAM/src/main.cpp
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@ -4,6 +4,7 @@
#include <Arduino.h>
#include <Wire.h>
#include <U8g2lib.h>
#include <time.h>
#ifndef NODE_LABEL
#define NODE_LABEL "RAM"
@ -21,10 +22,11 @@
static U8G2_SH1106_128X64_NONAME_F_HW_I2C g_oled(U8G2_R0, U8X8_PIN_NONE);
static const char *kTmpPath = "/tmp/volatile.txt";
static const size_t kTmpFileCapacity = 4096;
static const char *kTmpPath = "/tmp/AMY_output.log";
static const size_t kTmpFileCapacity = 32768;
static char g_tmpFileBuffer[kTmpFileCapacity];
static size_t g_tmpFileSize = 0;
static unsigned g_tmpLineNumber = 0;
static void oledShowLines(const char *l1,
const char *l2 = nullptr,
@ -47,6 +49,51 @@ static size_t getAvailableRamBytes()
return ESP.getFreeHeap();
}
static void getTimestamp(char *out, size_t outSize)
{
const time_t now = time(nullptr);
if (now > 1700000000) {
struct tm tmNow;
localtime_r(&now, &tmNow);
snprintf(out, outSize, "%04d-%02d-%02d %02d:%02d:%02d",
tmNow.tm_year + 1900,
tmNow.tm_mon + 1,
tmNow.tm_mday,
tmNow.tm_hour,
tmNow.tm_min,
tmNow.tm_sec);
return;
}
const uint32_t sec = millis() / 1000;
const uint32_t hh = sec / 3600;
const uint32_t mm = (sec % 3600) / 60;
const uint32_t ss = sec % 60;
snprintf(out, outSize, "uptime %02u:%02u:%02u", (unsigned)hh, (unsigned)mm, (unsigned)ss);
}
static void appendTimestampLine()
{
char timestamp[32];
getTimestamp(timestamp, sizeof(timestamp));
char line[96];
const int written = snprintf(line, sizeof(line), "%u, %s\r\n", g_tmpLineNumber + 1, timestamp);
if (written <= 0) {
return;
}
const size_t lineLen = (size_t)written;
if (g_tmpFileSize + lineLen > kTmpFileCapacity - 1) {
Serial.println("Warning: /tmp log full, stopping writes");
return;
}
memcpy(g_tmpFileBuffer + g_tmpFileSize, line, lineLen);
g_tmpFileSize += lineLen;
g_tmpLineNumber++;
}
static void printRamStatus()
{
const size_t freeBytes = getAvailableRamBytes();
@ -65,7 +112,7 @@ static void printRamStatus()
char line4[32];
snprintf(line4, sizeof(line4), "Total: %u KB", (unsigned)(totalBytes / 1024U));
char line5[32];
snprintf(line5, sizeof(line5), "Max alloc: %u KB", (unsigned)(maxAlloc / 1024U));
snprintf(line5, sizeof(line5), "Lines: %u", (unsigned)g_tmpLineNumber);
oledShowLines(line1, line2, line3, line4, line5);
}
@ -85,6 +132,7 @@ static void printTmpFileStat()
{
Serial.printf("Path: %s\r\n", kTmpPath);
Serial.printf("Size: %u bytes\r\n", (unsigned)g_tmpFileSize);
Serial.printf("Lines: %u\r\n", (unsigned)g_tmpLineNumber);
Serial.printf("Capacity: %u bytes\r\n", (unsigned)kTmpFileCapacity);
}
@ -219,5 +267,6 @@ void loop()
}
lastMs = now;
appendTimestampLine();
printRamStatus();
}