Serial Port Complete - Latest Microcontroller projects
Chapter 11 ! " To use the transmit and received interrupts without using interrupt priority: In the PIE1 registe ...
Ports for Embedded Systems If the RCSTA register indicated an error, set CREN = 0 to clear the error. To enable receiving anoth ...
Chapter 11 The example below assumes a 4-MHz oscillator and sets the bit rate to 2400 using a 16-bit value. In the TXSTA registe ...
Ports for Embedded Systems Using a 16-bit value to set the baud rate requires setting BRG16 = 1 and storing a value in SPBRGH. T ...
Chapter 11 The putcUSART function writes a byte to the port. The BusyUSART function returns 1 when the port is busy transmit ...
Ports for Embedded Systems An hserin statement can read a byte at the serial port: serial_in var byte if (PIR1.5 = 1) then ' ...
Chapter 11 Firmware can check for framing or overrun errors on the port. The following examples show how to ch ...
Ports for Embedded Systems If the firmware uses hserin to read multiple bytes or to wait for a byte, there is no way to detect o ...
Chapter 11 sequence, starting over on reaching the end of the task list. For example, one task can check for received serial-por ...
Ports for Embedded Systems unsigned char serial_in; while(1) { // Task loop. receive_serial_data(); // Call routines to perf ...
Chapter 11 On a timeout, the STR array contains any bytes that arrived. If you need to know how many bytes were received, initia ...
Ports for Embedded Systems The getsUSART function can read multiple characters but requires specifying how many characters t ...
Chapter 11 An hserin statement can return on receiving a specified value or receiving the specified number of bytes, whichev ...
Ports for Embedded Systems A device that is receiving commands that end with a CR can check for the char- acter on receiving ...
Chapter 11 another byte to TXREG for transmitting and perform any other necessary actions. The PIC18F4520 has two interrupt vect ...
Ports for Embedded Systems The OpenUSART function enables the receive interrupt by setting the second parameter to USART_RX_ ...
Chapter 11 This code sets up an ISR to respond to received serial-port data: // Interrupt vector for high-priority interrupts. # ...
Ports for Embedded Systems When sending data, firmware can read the flow-control input and wait if needed before wr ...
Chapter 11 Interrupt Control Register 3 (INTCON3) Bit 0 (INT1IF) and bit 1 (INT2IF) are set to 1 when their corresponding exter- ...
Ports for Embedded Systems data_ready_to_send var bit flow_control_input var PORTB.4 flow_control_output var PORTB.5 serial_ ...
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