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fix(driver_twai): fixed fd data bitrate error on slow bitrate

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This commit is contained in:
wanckl
2026-05-08 17:15:43 +08:00
parent 551f658fc9
commit e7f1308834
8 changed files with 73 additions and 49 deletions
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components/esp_driver_twai/test_apps/test_twai/main/test_twai_common.cpp
+2 -2
View File
@@ -165,9 +165,9 @@ TEST_CASE("twai baudrate measurement", "[twai]")
uint32_t source_freq = 0;
for (size_t i = 0; i < sizeof(twai_available_clk_srcs) / sizeof(twai_available_clk_srcs[0]); i++) {
TEST_ESP_OK(esp_clk_tree_src_get_freq_hz((soc_module_clk_t)twai_available_clk_srcs[i], ESP_CLK_TREE_SRC_FREQ_PRECISION_APPROX, &source_freq));
printf("Test clock source %d frequency: %ld Hz\n", twai_available_clk_srcs[i], source_freq);
test_twai_baudrate_correctness(twai_available_clk_srcs[i], 200000);
printf("\nTest clock source %d frequency: %ld Hz\n", twai_available_clk_srcs[i], source_freq);
test_twai_baudrate_correctness(twai_available_clk_srcs[i], 200000);
test_twai_baudrate_correctness(twai_available_clk_srcs[i], 1000000);
}
}
components/esp_driver_twai/test_apps/test_twai/main/test_twai_fd.cpp
+21 -5
View File
@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2025-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -159,8 +159,8 @@ TEST_CASE("twai fd transmit time (loopback)", "[twai]")
TEST_ESP_OK(twai_node_register_event_callbacks(node_hdl, &user_cbs, &rx_frame));
TEST_ESP_OK(twai_node_enable(node_hdl));
printf("%-12s %-14s %-14s %-7s %-15s %s\n", "pkg_len", "frame_len", "frame_num", "brs", "trans_time/ms", "result");
printf("-------------------------------------------------------------------------\n");
printf("%-12s %-14s %-14s %-7s %-15s %-15s %s\n", "pkg_len", "frame_len", "frame_num", "brs", "trans_time/ms", "predict/ms", "result");
printf("-----------------------------------------------------------------------------------------\n");
uint64_t time1, time2;
for (uint8_t test_mode = 0; test_mode < 3; test_mode ++) {
@@ -182,22 +182,38 @@ TEST_CASE("twai fd transmit time (loopback)", "[twai]")
TEST_ESP_OK(twai_node_transmit(node_hdl, &tx_msgs[tx_cnt], 1000));
}
// roughly estimate frame time with fixed frame overhead, ignoring dynamic bit stuffing
// 47: classic standard data frame overhead;
// 70: FD standard data frame overhead with CRC21
uint32_t arb_bits = frame_len * 8 + ((frame_len == 64) ? 70 : 47);
uint32_t data_bits = 0;
if (test_mode == 2) {
// BRS roughly splits the frame into 30 arbitration bits and payload + 40 FD data phase bits
arb_bits = 30;
data_bits = frame_len * 8 + 40;
}
uint64_t predict_time_ms = (uint64_t)trans_num * arb_bits * 1000 / node_config.bit_timing.bitrate;
predict_time_ms += (uint64_t)trans_num * data_bits * 1000 / node_config.data_timing.bitrate;
predict_time_ms += (trans_num * 10) / 1000; // add about 10 us interrupt overhead per frame
//waiting pkg receive finish
TEST_ESP_OK(twai_node_transmit_wait_all_done(node_hdl, -1));
time2 = esp_timer_get_time();
free(tx_msgs);
// check if pkg receive correct
printf("%-12d %-14d %-14d %-7d %-15.2f %-s\n",
printf("%-12d %-14d %-14d %-7d %-15.2f %-15llu %-s\n",
TEST_TRANS_TIME_BUF_LEN,
frame_len,
trans_num,
(test_mode == 2),
(time2 - time1) / 1000.f,
(unsigned long long)predict_time_ms,
memcmp(recv_pkg_ptr, send_pkg_ptr, TEST_TRANS_TIME_BUF_LEN) ? "failed" : "ok");
TEST_ASSERT_EQUAL_HEX8_ARRAY(send_pkg_ptr, recv_pkg_ptr, TEST_TRANS_TIME_BUF_LEN);
TEST_ASSERT_LESS_THAN((predict_time_ms / 10), abs((time2 - time1) / 1000 - predict_time_ms));
}
printf("-------------------------------------------------------------------------\n");
printf("-----------------------------------------------------------------------------------------\n");
free(send_pkg_ptr);
free(recv_pkg_ptr);