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Adds a new example: onReceiveExample.ino #9415

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Merged
merged 7 commits into from
Mar 26, 2024
Merged

Adds a new example: onReceiveExample.ino #9415

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9d787c2
feat: onReceiveExample.ino
SuGlider Mar 25, 2024
d5e098d
fix: onReceiveExample.ino
SuGlider Mar 25, 2024
793b1fb
feat: add explanation header
SuGlider Mar 25, 2024
0c60c73
fix: mutex release
SuGlider Mar 25, 2024
d2007e1
fix: add Mutex verification
SuGlider Mar 25, 2024
9419312
feat: Mutex error message
SuGlider Mar 25, 2024
3fecfce
feat: Mutex NULL testing
SuGlider Mar 25, 2024
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9 changes: 6 additions & 3 deletions libraries/ESP32/examples/Serial/onReceiveExample/onReceiveExample.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ SemaphoreHandle_t uart_buffer_Mutex = NULL;
// task created when onReceive() is used
void UART0_RX_CB() {
// take the mutex, waits forever until loop() finishes its processing
if (xSemaphoreTake(uart_buffer_Mutex, portMAX_DELAY)) {
if (uart_buffer_Mutex != NULL && xSemaphoreTake(uart_buffer_Mutex, portMAX_DELAY)) {
uint32_t now = millis(); // tracks timeout
while ((millis() - now) < communicationTimeout_ms) {
if (UART0.available()) {
Expand All @@ -88,7 +88,10 @@ void UART0_RX_CB() {
void setup() {
// creates a mutex object to control access to uart_buffer
uart_buffer_Mutex = xSemaphoreCreateMutex();

if(uart_buffer_Mutex == NULL) {
log_e("Error creating Mutex. Sketch will fail.");
delay(1000);
}
UART0.begin(115200);
UART0.onReceive(UART0_RX_CB); // sets the callback function
UART0.println("Send data to UART0 in order to activate the RX callback");
Expand All @@ -98,7 +101,7 @@ uint32_t counter = 0;
void loop() {
if (uart_buffer.length() > 0) {
// signals that the onReceive function shall not change uart_buffer while processing
if (xSemaphoreTake(uart_buffer_Mutex, portMAX_DELAY)) {
if (uart_buffer_Mutex != NULL && xSemaphoreTake(uart_buffer_Mutex, portMAX_DELAY)) {
// process the received data from UART0 - example, just print it beside a counter
UART0.print("[");
UART0.print(counter++);
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