LPUART_Init(DEMO_LPUART, &config, DEMO_LPUART_CLK_FREQ) Void LPUART_Loopback_Mode_Enable(LPUART_Type *base, bool enable)Ĭonfig.baudRate_Bps = BOARD_DEBUG_UART_BAUDRATE Uint8_t txbuff = "Lpuart polling example\r\nBoard will send back received characters\r\n" #define DEMO_LPUART_CLK_FREQ BOARD_DebugConsoleSrcFreq() Then, I tried it with polling code with your directives. Here are the following lines in my source code: But there are no output when I activate the loop mode with the LPUART_Loopback_Mode_Enable method. Hi Dear just firstly tried loopback example in LPUART_EDMA_TRANSFER. Which pin configuration should I set to do my work?Īre the CTRL = 1 and CTRL = 1 pins correct configuration for my question? What are the correct ones if it is false? In this mode, the transmitter output is internally connected to the receiver input and the RXD pin is not used by the LPUART. Loop mode is sometimes used to check software, independent of connections in the external system, to help isolate system problems. When CTRL is set, the CTRL bit chooses between loop mode (CTRL = 0) or single-wire mode (CTRL = 1). When LOOPS is set, the receiver input is internally connected to the UART_TX pin and RSRC determines whether this connection is alsoĠ = Provided LOOPS is set, RSRC is cleared, selects internal loop back mode and the UART does not use the UART_RX pins.ġ = Single-wire UART mode where the UART_TX pin is connected to the transmitter output and receiver input. ![]() This bit has no meaning or effect unless the LOOPS bit is set to 1. (See RSRC bit.) UART_RX pin is not used by UART. When LOOPS is set, the transmitter output is internally connected to the receiver input.Ġ = Normal operation - UART_RX and UART_TX use separate pins.ġ = Loop mode or single-wire mode where transmitter outputs are internally connected to receiver input. Selects between loop back modes and normal 2-pin full-duplex modes. Reference manual indicates there are a few relevant fields in the UART control register 1 to enable this functionality: So just testing functionality of my UART. So I want to send data from TX and getting these data from RX in the same board without need one more hardware. The following figure shows the block diagram of the Cyclone® IV GX FPGA transceivers, both physical medium attachment (PMA) and physical coding sublayer (PCS). The blocks within the PCS can be bypassed, depending on your requirements.I'm trying to test UART loopback mode on a IMXRT1024 EVK board. Diagnostic features such as serial loopback, parallel loopback, reverse serial loopback, and loopback master and slave capability in the PCI-SIG* compliant PCI Express* hard IP block.On-chip power supply decoupling to satisfy transient current requirements at higher frequencies, which reduces the need for on-board decoupling capacitors.On-die power supply regulators for transmitter and receiver PLL charge pump and voltage controlled oscillator (VCO) for superior noise immunity.8B/10B encoder and decoder that performs 8-bit to 10-bit encoding and 10-bit to 8-bit decoding.Built-in byte ordering so that a frame or packet always starts in a known byte lane.Two phase-locked loop (PLL) inputs on each transmitter the EP4CGX50 device and larger devices also have independent clock dividers to allow different clock rates for each channel.PIPE interface that connects directly to embedded PCI Express* Gen1 (2.5 Gbps) hard intellectual property (IP) to support PCI-SIG* compliant x1, x2, or x4.Dedicated circuitry compliant with the physical interface for PCI Express*, XAUI, and Gbps Ethernet.Support for protocol features such as spread-spectrum clocking in PCI Express*, DisplayPort, V-by-One, and SATA configurations.Dynamic reconfiguration of the transceiver to support multiple protocols and data rates on the same channel without reprogramming the FPGA.User-controlled receiver equalization to compensate for frequency-dependent losses in the physical medium.Programmable pre-emphasis settings and adjustable differential output voltage (VOD) for improved signal integrity.Flexible and easy-to-configure transceiver datapath to implement industry-standard and proprietary protocols. ![]()
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