同一个串口在非流控模式和硬件流控模式之间切换，系统起来首次切换到硬件流控模式后esp32与模组串口通讯都正常；如果重新初始化串口，再设置成流控模式，esp32与模组串口通讯大概率会不正常，期间系统没有异常打印。
如果一直使用非流控模式，中途不管调用多少次uart_init()，esp32与模组串口通讯都是正常的。
调用uart_init()后 进入非流控模式，
调用uart_hw_flow_init()后 进入硬件流控模式
esp32串口非流控模式和硬件流控模式反复切换问题 有什么办法解决吗？
串口在非流控模式和硬件流控模式之间切换，是因为通过AT指令操控模组时，模组初始状态是非流控模式，初始化完成后设置模组为流控模式（使用流控模式是为了大数据量传输可靠），esp32串口也要相应切换到硬件流控模式。
Code:
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#define MODULE_TXD1_PIN (GPIO_NUM_32)#define MODULE_RXD1_PIN (GPIO_NUM_35)//only use input//UART1#define RX1_BUF_SIZE (512) //26//#define TX1_BUF_SIZE (512) //33//#define TXD1_PIN MODULE_TXD1_PIN //(GPIO_NUM_25)#define RXD1_PIN MODULE_RXD1_PIN //(GPIO_NUM_32) //(GPIO_NUM_5) //(GPIO_NUM_35)#define RXD1_CTS (GPIO_NUM_36)//only use input#define TXD1_RTS (GPIO_NUM_33)
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void uart_init(void){ xSemaphoreTake(g_at_uart_lock, portMAX_DELAY); if(uart_is_driver_installed(AT_UART)) { printf("%d %s()...uart_is_driver_installed rn", __LINE__, __FUNC
tiON__); ESP_ERROR_CHECK(uart_driver_delete(AT_UART)); } int uart_num = AT_UART; uart_config_t uart_config = { .baud_rate = 115200,//921600,//115200, .data_bits = UART_DATA_8_BITS, .parity = UART_PARITY_DISABLE, .stop_bits = UART_STOP_BITS_1, .flow_ctrl = UART_HW_FLOWCTRL_DISABLE, .rx_flow_ctrl_thresh = 122 }; ESP_ERROR_CHECK(uart_param_config(uart_num, &uart_config)); ESP_ERROR_CHECK(uart_set_pin(uart_num, TXD1_PIN, RXD1_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE)); ESP_ERROR_CHECK(uart_driver_install(uart_num, RX1_BUF_SIZE * 2, TX1_BUF_SIZE * 2, 0, NULL, ESP_INTR_FLAG_IRAM)); xSemaphoreGive(g_at_uart_lock);}
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void uart_hw_flow_init(void){ xSemaphoreTake(g_at_uart_lock, portMAX_DELAY); if(uart_is_driver_installed(AT_UART)) { printf("%d %s()...uart_is_driver_installed rn", __LINE__, __FUNCTION__); ESP_ERROR_CHECK(uart_driver_delete(AT_UART)); }#define ENABLE_HW_FLOW 1//0 int uart_num = AT_UART; uart_config_t uart_config = { .baud_rate = 115200,//921600,//115200, .data_bits = UART_DATA_8_BITS, .parity = UART_PARITY_DISABLE, .stop_bits = UART_STOP_BITS_1, #if ENABLE_HW_FLOW .flow_ctrl = UART_HW_FLOWCTRL_CTS_RTS #else .flow_ctrl = UART_HW_FLOWCTRL_DISABLE, #endif .rx_flow_ctrl_thresh = 122 }; ESP_ERROR_CHECK(uart_param_config(uart_num, &uart_config)); #if ENABLE_HW_FLOW ESP_ERROR_CHECK(uart_set_pin(uart_num, TXD1_PIN, RXD1_PIN, TXD1_RTS, RXD1_CTS)); #else ESP_ERROR_CHECK(uart_set_pin(uart_num, TXD1_PIN, RXD1_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE)); #endif ESP_ERROR_CHECK(uart_driver_install(uart_num, RX1_BUF_SIZE * 2, TX1_BUF_SIZE * 2, 0, NULL, ESP_INTR_FLAG_IRAM)); #undef ENABLE_HW_FLOW xSemaphoreGive(g_at_uart_lock);}
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