[问答]

UART外设发送完TX缓冲区中的所有字节时，如何执行一个中断？

216 中断

问答对人有帮助，内容完整，我也想知道答案 0 每次 UART 外设发送完 TX 缓冲区中的所有字节时，我都想执行一个中断。我知道发生这种情况时我可以使用事件队列来接收事件，但是对于我的应用程序，我需要立即触发中断例程，而不是轮询队列。我在 PIO 中编写了以下代码。代码：全选 #include #include #include "timingInterface.hpp" #define UART_PORT UART_NUM_2 #define UART_PIN 5 #define UART_USE_DEFAULT_PIN -1 #define UART_BAUD 2400 #define UART_TX_BUFFER_SIZE 256 #define UART_RX_BUFFER_SIZE 256 #define UART_EVENT_QUEUE_SIZE 0 #define UART_EVENT_ALLOCATE_INTERRUPT false #define UART_RX_READ_TIMEOUT 1 #define UART_RTS_DISABLED -1 #define UART_CTS_DISABLED -1 TimingInterface sendPeriodTimer; uint8_t buffer[255]; uint8_t bufferIndex; volatile int interruptCounter; char count; const int LENGTH = 1; void IRAM_ATTR uartIsr(void args){ interruptCounter++; } void setup() { Serial.begin(115200); Serial.println("serial to terminal has been started"); interruptCounter = 0; count = 0; uart_config_t uart_config = { .baud_rate = UART_BAUD, .data_bits = UART_DATA_8_BITS, .parity = UART_PARITY_EVEN, .stop_bits = UART_STOP_BITS_1, .flow_ctrl = UART_HW_FLOWCTRL_DISABLE }; ESP_ERROR_CHECK(uart_param_config(UART_PORT, &uart_config)); ESP_ERROR_CHECK(uart_driver_install(UART_PORT, UART_TX_BUFFER_SIZE, UART_RX_BUFFER_SIZE, UART_EVENT_QUEUE_SIZE, NULL, UART_EVENT_ALLOCATE_INTERRUPT)); ESP_ERROR_CHECK(uart_set_rx_timeout(UART_PORT, UART_RX_READ_TIMEOUT)); ESP_ERROR_CHECK(uart_set_pin(UART_PORT, UART_PIN, UART_USE_DEFAULT_PIN, UART_RTS_DISABLED, UART_CTS_DISABLED)); ESP_ERROR_CHECK(uart_isr_register(UART_PORT, uartIsr, NULL, ESP_INTR_FLAG_IRAM, NULL)); ESP_ERROR_CHECK(uart_enable_tx_intr(UART_PORT, true, 0)); } void loop() { uart_write_bytes(UART_PORT, &count, LENGTH); count++; Serial.printf("char value %d, current interrupt counter value: %d\n", count, interruptCounter); vTaskDelay(200); } 我正在使用以下 PIO 配置（使用 espressif32 V3.5.0）代码：全选 [env:esp32dev] platform = espressif32 board = esp32dev framework = arduino lib_extra_dirs = ~/git/olarm-libraries/ targets = upload, monitor monitor_speed = 115200 monitor_filters = esp32_exception_decoder, time upload_port = ${sysenv.UPLOAD_PORT} monitor_port = ${sysenv.UPLOAD_PORT} test_port = ${sysenv.TEST_PORT} 但是，在运行时，由于函数调用uart_isr_register，我收到了一个 esp 错误。生成以下输出代码：全选 11:24:44.777 > ets Jul 29 2019 12:21:46 11:24:44.777 > 11:24:44.777 > rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) 11:24:44.777 > configsip: 0, SPIWP:0xee 11:24:44.777 > clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 11:24:44.777 > mode:DIO, clock div:2 11:24:44.777 > load:0x3fff0018,len:4 11:24:44.777 > load:0x3fff001c,len:1044 11:24:44.777 > load:0x40078000,len:10124 11:24:44.777 > load:0x40080400,len:5828 11:24:44.777 > entry 0x400806a8 11:24:44.885 > serial to terminal has been started 11:24:44.901 > ESP_ERROR_CHECK failed: esp_err_t 0x105 (ESP_ERR_NOT_FOUND) at 0x4008543c 11:24:44.901 > file: "src/main.cpp" line 50 11:24:44.901 > func: void setup() 11:24:44.901 > expression: uart_isr_register(UART_PORT, uartIsr, NULL, ESP_INTR_FLAG_IRAM, NULL) 11:24:44.917 > 11:24:44.917 > ELF file SHA256: 0000000000000000 11:24:44.917 > 11:24:44.917 > Backtrace: 0x40084f2c:0x3ffb1f20 0x4008543f:0x3ffb1f40 0x400d0e9c:0x3ffb1f60 0x400d2242:0x3ffb1fb0 0x40086e11:0x3ffb1fd0 11:24:44.990 > #0 0x40084f2c:0x3ffb1f20 in invoke_abort at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/panic.c:715 11:24:44.990 > #1 0x4008543f:0x3ffb1f40 in _esp_error_check_failed at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/panic.c:721 11:24:44.990 > #2 0x400d0e9c:0x3ffb1f60 in setup() at src/main.cpp:47 (discriminator 2) 11:24:44.990 > #3 0x400d2242:0x3ffb1fb0 in loopTask(void) at /Users/justin/.platformio/packages/framework-arduinoespressif32/cores/esp32/main.cpp:18 11:24:44.990 > #4 0x40086e11:0x3ffb1fd0 in vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c:355 (discriminator 1) 11:24:44.990 > 11:24:44.990 > Rebooting... 0
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