d718b143d2
Let GCC check the format string to Print::printf(). Will catch when sketches use incorrect parameters to `Serial::printf()`.
92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
// Simple logger with USB upload to PC
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// Uses SingleFileDrive to export an onboard LittleFS file to the computer
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// The PC can open/copy the file, and then the user can delete it to restart
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// Released to the public domain, 2022 - Earle F. Philhower, III
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#include <SingleFileDrive.h>
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#include <LittleFS.h>
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uint32_t cnt = 0;
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bool okayToWrite = true;
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// Make the CSV file and give it a simple header
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void headerCSV() {
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File f = LittleFS.open("data.csv", "w");
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f.printf("sample,millis,temp,rand\n");
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f.close();
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cnt = 0;
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}
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// Called when the USB stick connected to a PC and the drive opened
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// Note this is from a USB IRQ so no printing to SerialUSB/etc.
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void plug(uint32_t i) {
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(void) i;
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okayToWrite = false;
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}
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// Called when the USB is ejected or removed from a PC
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// Note this is from a USB IRQ so no printing to SerialUSB/etc.
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void unplug(uint32_t i) {
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(void) i;
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okayToWrite = true;
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}
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// Called when the PC tries to delete the single file
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// Note this is from a USB IRQ so no printing to SerialUSB/etc.
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void deleteCSV(uint32_t i) {
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(void) i;
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LittleFS.remove("data.csv");
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headerCSV();
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}
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void setup() {
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Serial.begin();
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delay(5000);
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LittleFS.begin();
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// Set up the USB disk share
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singleFileDrive.onDelete(deleteCSV);
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singleFileDrive.onPlug(plug);
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singleFileDrive.onUnplug(unplug);
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singleFileDrive.begin("data.csv", "Recorded data from the Raspberry Pi Pico.csv");
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// Find the last written data
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File f = LittleFS.open("data.csv", "r");
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if (!f || !f.size()) {
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cnt = 1;
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headerCSV();
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} else {
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if (f.size() > 2048) {
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f.seek(f.size() - 1024);
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}
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do {
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String s = f.readStringUntil('\n');
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sscanf(s.c_str(), "%lu,", &cnt);
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} while (f.available());
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f.close();
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cnt++;
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}
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Serial.printf("Starting acquisition at %lu\n", cnt);
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}
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void loop() {
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float temp = analogReadTemp();
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uint32_t hwrand = rp2040.hwrand32();
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// Make sure the USB connect doesn't happen while we're writing!
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noInterrupts();
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if (okayToWrite) {
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Serial.printf("Sampling...%lu\n", cnt);
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// Don't want the USB to connect during an update!
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File f = LittleFS.open("data.csv", "a");
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if (f) {
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f.printf("%lu,%lu,%f,%lu\n", cnt++, millis(), temp, hwrand);
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f.close();
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}
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}
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interrupts();
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delay(10000);
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}
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