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example/modbus_master: fix the assert for uart_set_pin (backport v4.1)
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@ -242,14 +242,14 @@ static esp_err_t master_init(void)
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// Set UART pin numbers
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err = uart_set_pin(MB_PORT_NUM, CONFIG_MB_UART_TXD, CONFIG_MB_UART_RXD,
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CONFIG_MB_UART_RTS, UART_PIN_NO_CHANGE);
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MASTER_CHECK((err == ESP_OK), ESP_ERR_INVALID_STATE,
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"mb serial set pin failure, uart_set_pin() returned (0x%x).", (uint32_t)err);
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err = mbc_master_start();
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MASTER_CHECK((err == ESP_OK), ESP_ERR_INVALID_STATE,
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"mb controller start fail, returns(0x%x).",
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(uint32_t)err);
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MASTER_CHECK((err == ESP_OK), ESP_ERR_INVALID_STATE,
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"mb serial set pin failure, uart_set_pin() returned (0x%x).", (uint32_t)err);
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// Set driver mode to Half Duplex
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err = uart_set_mode(MB_PORT_NUM, UART_MODE_RS485_HALF_DUPLEX);
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MASTER_CHECK((err == ESP_OK), ESP_ERR_INVALID_STATE,
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