xEventGroupSetBits don't trigger xEventGroupWaitBits when using UART
Posted: Wed Sep 13, 2017 6:18 pm
I'm using event group to keep wait until one of my processes finishes. My process is sending one AT command over UART and receive the feedback over UART. But problem is it works when i execute xEventGroupSetBits right before read UART bytes using uart_read_bytes, But it won't work if i set bits after uart_read_bytes . Please see below code,
This is the function i use to read the feedback from UART once i sent an AT command request,
This is what i'm calling from main task,
Can anyone tell me what am i missing here please?
This is the function i use to read the feedback from UART once i sent an AT command request,
Code: Select all
char* get_at_response(uart_port_t uart_num) {
char* result = NULL;
while (1) {
uint8_t* data = (uint8_t*) malloc(BUF_SIZE);
xEventGroupSetBits(gsm_event_group, GSM_0_DONE_BIT | GSM_1_DONE_BIT);//This works
int len = uart_read_bytes(uart_num, data, BUF_SIZE,
20 / portTICK_RATE_MS);
xEventGroupSetBits(gsm_event_group, GSM_0_DONE_BIT | GSM_1_DONE_BIT);//This does not work
char payloadChr[len];
if (len > 1) {
for (int i = 0; i < len; i++) {
char c = (char) data[i];
payloadChr[i] = c;
}
result = (char*) malloc(sizeof(payloadChr) + 1);
strncpy(result, payloadChr, sizeof(payloadChr) + 1);
}
break;
}
return result;
}Code: Select all
void app_main() {
gsm_event_group = xEventGroupCreate();
xReturned = xTaskCreate(init_task, "init_task", 2048, GSM_0, 3, &xHandle);
EventBits_t uxBits;
while (1) {
ESP_LOGI(TAG, "WAITING...");
uxBits = xEventGroupWaitBits(gsm_event_group,
GSM_0_DONE_BIT | GSM_1_DONE_BIT, true, false, portMAX_DELAY);
if (uxBits & GSM_0_DONE_BIT) {
vTaskDelete(xHandle);
xReturned = xTaskCreate(init_task, "init_task", 2048, GSM_1, 3,
&xHandle);
}
if (uxBits & GSM_1_DONE_BIT) {
vTaskDelete(xHandle);
}
}
}