error frame on TWAI initialization

[Cedric]

Hello,

I use the twai and can successfully write and receive frames. However, when I reset the esp23 I see error frames showing up. It seems that the esp_tx pin send a negative pulse on initialization which result in an error on the bus. How can I prevent this? You can see what happens on the screenshots I added.

This is the code I use to initialize the twai.

Code: [Select all] [Expand/Collapse]

1.     // Initialize configuration structures using macro initializers
2.     twai_general_config_t g_config = TWAI_GENERAL_CONFIG_DEFAULT( CAN_TX,CAN_RX, TWAI_MODE_NORMAL);
3.     g_config.tx_queue_len          = 10;
4.     twai_timing_config_t t_config  = TWAI_TIMING_CONFIG_100KBITS();
5.     twai_filter_config_t f_config  = TWAI_FILTER_CONFIG_ACCEPT_ALL();
6.  
7.     // Install TWAI driver
8.     // negative pulse occures in next function
9.     if (twai_driver_install(&g_config, &t_config, &f_config) == ESP_OK) {
10.         printf("Driver installed\n");
11.     } else {
12.         printf("Failed to install driver\n");
13.         return;
14.     }
15.  
16.     // Start TWAI driver
17.     if (twai_start() == ESP_OK) {
18.         printf("Driver started\n");
19.     } else {
20.         printf("Failed to start driver\n");
21.         return;
22.     }

GeSHi © Codebox Plus Extension

Board: ESP32-S3-DevKitC-1 v1.0
ESP-IDF: platform-espressif32 6.4.0
CAN transceiver: SN65HVD232DR
esp_twai_tx_pin: GPIO_NUM_11
esp_twai_rx_pin: GPIO_NUM_12