Portenta H7 SDRAM 问题，红灯闪烁 4 长 4 短

Question

我是 Arduino 新手，我的 Arduino Portenta H7 遇到问题。我编写了一个草图，以 25kHz 采样率对来自三个传感器的模拟信号进行采样，并使用外部 SDRAM 进行数据存储。该草图管理动态内存分配，将传感器数据存储在数组中，直到达到指定的数据点计数 (data_len)，并检查分配错误，如果发生任何错误，则停止程序。

我的问题是在执行 free_memory 函数时出现的，程序崩溃了，红灯以 4 长 4 短的方式闪烁表示。

我尝试单独释放每个缓冲区，但问题仍然存在。这是我的代码：

#include "Arduino_PortentaBreakout.h"
#include "SDRAM.h"

REDIRECT_STDOUT_TO(Serial);

// Constants for ADC warm-up and sampling interval
const int ADC_WARMUP_READS = 1000;  // Number of reads to stabilize ADC readings
const long interval = 40;           // Sampling interval in microseconds (40 microseconds for 25kHz sampling rate)

// Reference voltage
const float VREF = 3.10;  // Reference voltage in volts

// Definitions of analog pins used
const breakoutPin PHASE_1 = ANALOG_A0;
const breakoutPin PHASE_2 = ANALOG_A1;
const breakoutPin CURRENT = ANALOG_A3;

// Array containing the analog pins for easy access
const breakoutPin PIN_Array[] = { PHASE_1, PHASE_2, CURRENT };
const char* PIN_Names[] = { "PHASE_1", "PHASE_2", "CURRENT" };

// Number of data points to sample
const long data_len = 250000;
// Buffers to store sampled values
uint16_t* data_PHASE_1;
uint16_t* data_PHASE_2;
uint16_t* data_CURRENT;

// Function to fill data arrays
void fillArrays() {
    // ADC warm-up to stabilize the sensor signal
    for (int i = 0; i < ADC_WARMUP_READS; i++) {
        Breakout.analogRead(PHASE_1);
        Breakout.analogRead(PHASE_2);
        Breakout.analogRead(CURRENT);
    }

    // Time preparation to measure buffer fill duration
    unsigned long timeStart = micros();
    long i = 0;
    unsigned long previousMicros = 0;
    while (i < data_len) {
        unsigned long currentMicros = micros();
        if (currentMicros - previousMicros >= interval) {
            previousMicros = currentMicros;
            data_PHASE_1[i] = Breakout.analogRead(PHASE_1);
            data_PHASE_2[i] = Breakout.analogRead(PHASE_2);
            data_CURRENT[i] = Breakout.analogRead(CURRENT);
            i++;
        }
    }
    unsigned long timeEnd = micros();
    Serial.print("Total loops completed: ");
    Serial.println(i);
}

void free_memory() {
    SDRAM.free(data_PHASE_1); data_PHASE_1 = NULL;
    SDRAM.free(data_PHASE_2); data_PHASE_2 = NULL;
    SDRAM.free(data_CURRENT); data_CURRENT = NULL;
}

void setup() {
    Serial.begin(115200);
    while (!Serial);  // Wait for the serial connection to be established

    analogReadResolution(16);
    SDRAM.begin();

    data_PHASE_1 = (uint16_t*)SDRAM.malloc(data_len * sizeof(uint16_t));
    data_PHASE_2 = (uint16_t*)SDRAM.malloc(data_len * sizeof(uint16_t));
    data_CURRENT = (uint16_t*)SDRAM.malloc(data_len * sizeof(uint16_t));

    if (data_PHASE_1 == NULL || data_PHASE_2 == NULL || data_CURRENT == NULL) {
        Serial.println("Error: Failed to allocate memory, halting execution.");
        while (1);  // Halt further execution
    }

    if (SDRAM.test()) {
        Serial.println("SDRAM is completely functional");
    }
}

void loop() {
    fillArrays();
    for (int i = 0; i < 3; ++i) {
        delay(2000);
        const char* PIN_NAME = PIN_Names[i];
        uint16_t* data = (i == 0) ? data_PHASE_1 : (i == 1) ? data_PHASE_2 : data_CURRENT;

        Serial.print("Transmitting data for ");
        Serial.println(PIN_NAME);
        for (long j = 0; j < data_len; j++) {
            Serial.println(data[j]);
        }
        Serial.print("End of data transmission for ");
        Serial.println(PIN_NAME);
    }
    free_memory();
    Serial.println("Click on reset to restart.");
    while (1);  // Pause 
}

Answer 1

我有这个确切的问题。我还没有调查得太彻底。我已经仔细检查了分配的地址与传递给 free 的地址相同，肯定发生了一些事情。