![]() ![]() The SPI interface power/clock control bit. The SSP 1 interface power/clock control bit.Ī/D converter (ADC) power/clock control bit.ĬAN Controller 1 power/clock control bit.ĬAN Controller 2 power/clock control bit. Power/clock control bit for IOCON, GPIO, and GPIO interrupts. Repetitive Interrupt Timer power/clock control bit. Quadrature Encoder Interface power/clock control bit. The I2C1 interface power/clock control bit. UnLSR0 is set when the UnRBR holds an unread character and is cleared when The SSP0 interface power/clock control bit. In this case, the UARTn RBR FIFO will not be UnLSR1 is set when UARTn RSR has a new character assembled and The overrun error condition is set as soon as it occurs. Overwritten and the character in the UARTn RSR will be lost. Note: A parity error is associated with the character at the top of the UARTn RBR When the parity bit of a received character is in the wrong state, a parity error When the stop bit of a received character is a logic 0, a framing error occurs. When RXDn is held in the spacing state (all zeroes) for one full character Note: A framing error is associated with the character at the top of the UARTn However, it cannot be assumed that the next received byte will be correct Resynchronize to the data and assume that the bad stop bit is actually an early Upon detection of a framing error, the Rx will attempt to The time of the framing error detection isĭependent on UnFCR0. ![]() THRE is set immediately upon detection of an empty UARTn THR and is cleared Note: The break interrupt is associated with the character at the top of the UARTn Once the breakĬondition has been detected, the receiver goes idle until RXDn goes to marking Transmission (start, data, parity, stop), a break interrupt occurs. TEMT is set when both UnTHR and UnTSR are empty TEMT is cleared whenĮither the UnTSR or the UnTHR contain valid data.Ġ UnTHR and/or the UnTSR contains valid data. ![]() UnLSR is set when a character with a Rx error such as framing error, parityĮrror or break interrupt, is loaded into the UnRBR. UnLSR register is read and there are no subsequent errors in the UARTn FIFO.Ġ UnRBR contains no UARTn RX errors or UnFCR=0.ġ UARTn RBR contains at least one UARTn RX error. An interrupt service routine (ISR) must be written that.Interrupts must be enabled at the micro-controller.Interrupts must be enabled at the peripheral.The delay in reading and sending the second character gives the impression on th etrace of two stop bits.At this point the code will return to the transmitter and when ready it will output the second character.The receiver will read the character and toggle the output.The first character is into the receive buffer at the end of its stop bit.the first character will be transmitted and the receiver will poll waiting for that character.When the character is received pin 19 is toggled to acknowledge receipt.The character 'U' is output the UART3 Tx (MBED pin 9 and top waveform on the trace)-Pin 20 is also toggled (centre trace).The UART is initialised for 19200 baud, 8 data bits & 1 stop bit.While (!((LPC_UART3-> LSR) & (1< < 0))) Īn explanation of the code and trace is as follows: Reserved, the value read from a reserved bit is not defined. With the ARM because of the way it handles interrupts the ISR can be written as a standard function. KEIL MDK ARM UART INTERRUPT FIFO CODEįurther the Keil Start Up code sets up an interrupt vector. For the SCI (Transmit or Receive) this has the label USARTx_IRQHandler. ![]() If the ISR is given this label the vector is already set up/initialised.Įnabling SCI Interrupts at the PeripheralĮnables the Receive Data Available interrupt for UARTn. The Character Receive Time-out interrupt.Įnables the THRE interrupt for UARTn. The status of this can be readĮnables the UARTn RX line status interrupts. Reserved, user software should not write ones to reserved bits. KEIL MDK ARM UART INTERRUPT FIFO SOFTWARE The valueĮnables the auto-baud time-out interrupt. KEIL MDK ARM UART INTERRUPT FIFO SOFTWARE. ![]()
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