使用多核时 ESP32 不更新变量
ESP32 not updating the variable when multiple cores are used
我的计划是从 ESP32 的 CORE-1
收集数据,并将 ESP32 的 CORE-0
用于所有其他任务。但是,我看到使用多核时变量没有正确更新。在此示例中,我看到 getAllData
的值仅更新一次。
const TickType_t xDelay = 1000 / portTICK_PERIOD_MS;
TaskHandle_t collectData;
bool volatile getAllData;
bool volatile dataReadyToSend;
void setup() {
Serial.begin(115200);
Serial.print("setup() is running on core ");
Serial.println(xPortGetCoreID());
xTaskCreatePinnedToCore(collectDataCode,"collectData",10000,NULL,1,&collectData,0);
delay(500);
}
void loop() {
if (Serial.available()) {
Serial.flush();
getAllData = true;
}
Serial.print("From loop: ");
Serial.println(getAllData);
if (dataReadyToSend) {
dataReadyToSend = false;
}
delay(1000);
}
void collectDataCode(void * params) {
while (1) {
Serial.print("From collectData: ");
Serial.println(getAllData);
if (getAllData) {
getAllData=0;
}
vTaskDelay( xDelay );
}
}
上面代码的输出如下。我输入 xxx
的地方。据观察,变量 getAllData
在这个实例中得到了更新,但之后没有改变。
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
xxx
From loop: 1
From collectData: 1
From loop: 1
From collectData: 1
From loop: 1
From collectData: 1
From loop: 1
From collectData: 1
更新
根据建议,我将 atomic
与以下代码一起使用。我仍然没有看到成功。
#ifdef __cplusplus
#include <atomic>
using namespace std;
#else
#include <stdatomic.h>
#endif
TaskHandle_t collectData;
atomic<bool> getAllData;
atomic<bool> dataReadyToSend;
#include "collectData.h"
void setup() {
Serial.begin(115200);
Serial.print("setup() is running on core ");
Serial.println(xPortGetCoreID());
xTaskCreatePinnedToCore(collectDataCode,"collectData",10000,NULL,1,&collectData,0);
delay(500);
}
void loop() {
if (Serial.available()) {
Serial.flush();
atomic_store (&getAllData, true);
}
Serial.print("From loop: ");
Serial.println(atomic_load(&getAllData));
if (dataReadyToSend) {
dataReadyToSend = false;
}
delay(1000);
}
void collectDataCode(void * params) {
while (1) {
Serial.print("From collectData: ");
Serial.println(atomic_load(&getAllData));
if (atomic_load(&getAllData)) {
atomic_store (&getAllData, false);
}
vTaskDelay( xDelay );
}
}
我找到了答案。问题不在于变量本身,而在于 Arduino 的 Serial.flush()
。从 1.0 版开始,arduino 使用 Serial.flush()
来清除传出的串行数据而不是传入的串行数据。所以,我用下面的代码替换了 Serial.flush()
。
while(Serial.available()) {
Serial.read();
}
通过这次更新,我的代码运行良好。感谢@PeteBecker 的评论,我正在使用 atomic。下面给出最终的代码和结果。
#ifdef __cplusplus
#include <atomic>
using namespace std;
#else
#include <stdatomic.h>
#endif
TaskHandle_t collectData;
atomic<bool> getAllData;
atomic<bool> dataReadyToSend;
#include "collectData.h"
void setup() {
Serial.begin(115200);
Serial.print("setup() is running on core ");
Serial.println(xPortGetCoreID());
xTaskCreatePinnedToCore(collectDataCode,"collectData",10000,NULL,1,&collectData,0);
delay(500);
}
void loop() {
if (Serial.available()) {
while(Serial.available()) {
Serial.read();
}
getAllData.store(true);
Serial.println("Received data request");
}
Serial.print("From loop: ");
Serial.println(getAllData.load());
if (dataReadyToSend) {
dataReadyToSend = false;
}
delay(1000);
}
void collectDataCode(void * params) {
while (1) {
Serial.print("From collectData: ");
Serial.println(atomic_load(&getAllData));
if (getAllData.load()) {
getAllData.store(false);
}
vTaskDelay( xDelay );
}
}
结果
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
.
From loop: 0
From collectData: 0
Received data request
From loop: 1
From collectData: 1
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
我的计划是从 ESP32 的 CORE-1
收集数据,并将 ESP32 的 CORE-0
用于所有其他任务。但是,我看到使用多核时变量没有正确更新。在此示例中,我看到 getAllData
的值仅更新一次。
const TickType_t xDelay = 1000 / portTICK_PERIOD_MS;
TaskHandle_t collectData;
bool volatile getAllData;
bool volatile dataReadyToSend;
void setup() {
Serial.begin(115200);
Serial.print("setup() is running on core ");
Serial.println(xPortGetCoreID());
xTaskCreatePinnedToCore(collectDataCode,"collectData",10000,NULL,1,&collectData,0);
delay(500);
}
void loop() {
if (Serial.available()) {
Serial.flush();
getAllData = true;
}
Serial.print("From loop: ");
Serial.println(getAllData);
if (dataReadyToSend) {
dataReadyToSend = false;
}
delay(1000);
}
void collectDataCode(void * params) {
while (1) {
Serial.print("From collectData: ");
Serial.println(getAllData);
if (getAllData) {
getAllData=0;
}
vTaskDelay( xDelay );
}
}
上面代码的输出如下。我输入 xxx
的地方。据观察,变量 getAllData
在这个实例中得到了更新,但之后没有改变。
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
xxx
From loop: 1
From collectData: 1
From loop: 1
From collectData: 1
From loop: 1
From collectData: 1
From loop: 1
From collectData: 1
更新
根据建议,我将 atomic
与以下代码一起使用。我仍然没有看到成功。
#ifdef __cplusplus
#include <atomic>
using namespace std;
#else
#include <stdatomic.h>
#endif
TaskHandle_t collectData;
atomic<bool> getAllData;
atomic<bool> dataReadyToSend;
#include "collectData.h"
void setup() {
Serial.begin(115200);
Serial.print("setup() is running on core ");
Serial.println(xPortGetCoreID());
xTaskCreatePinnedToCore(collectDataCode,"collectData",10000,NULL,1,&collectData,0);
delay(500);
}
void loop() {
if (Serial.available()) {
Serial.flush();
atomic_store (&getAllData, true);
}
Serial.print("From loop: ");
Serial.println(atomic_load(&getAllData));
if (dataReadyToSend) {
dataReadyToSend = false;
}
delay(1000);
}
void collectDataCode(void * params) {
while (1) {
Serial.print("From collectData: ");
Serial.println(atomic_load(&getAllData));
if (atomic_load(&getAllData)) {
atomic_store (&getAllData, false);
}
vTaskDelay( xDelay );
}
}
我找到了答案。问题不在于变量本身,而在于 Arduino 的 Serial.flush()
。从 1.0 版开始,arduino 使用 Serial.flush()
来清除传出的串行数据而不是传入的串行数据。所以,我用下面的代码替换了 Serial.flush()
。
while(Serial.available()) {
Serial.read();
}
通过这次更新,我的代码运行良好。感谢@PeteBecker 的评论,我正在使用 atomic。下面给出最终的代码和结果。
#ifdef __cplusplus
#include <atomic>
using namespace std;
#else
#include <stdatomic.h>
#endif
TaskHandle_t collectData;
atomic<bool> getAllData;
atomic<bool> dataReadyToSend;
#include "collectData.h"
void setup() {
Serial.begin(115200);
Serial.print("setup() is running on core ");
Serial.println(xPortGetCoreID());
xTaskCreatePinnedToCore(collectDataCode,"collectData",10000,NULL,1,&collectData,0);
delay(500);
}
void loop() {
if (Serial.available()) {
while(Serial.available()) {
Serial.read();
}
getAllData.store(true);
Serial.println("Received data request");
}
Serial.print("From loop: ");
Serial.println(getAllData.load());
if (dataReadyToSend) {
dataReadyToSend = false;
}
delay(1000);
}
void collectDataCode(void * params) {
while (1) {
Serial.print("From collectData: ");
Serial.println(atomic_load(&getAllData));
if (getAllData.load()) {
getAllData.store(false);
}
vTaskDelay( xDelay );
}
}
结果
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
.
From loop: 0
From collectData: 0
Received data request
From loop: 1
From collectData: 1
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0
From collectData: 0
From loop: 0