hi how can i give keyboard input via uart usb port to write it on the lcd of arm cortex m3
What is a "uart usb port" ?
To get keyboard input via a UART, you will obviously need a keyboard that provides a UART-compatible output!
To get keyboard input via a USB port, you will need a USB keyboard, a USB Host port, and appropriate USB Host software. If the particular Cortex-M3 chip that you have in mind has a USB Host port, then the supplier will most likely have provided examples...
In either case, the receiving is independent of what you do next with the data.
Similarly, displaying data on an LCD is independent of where the data came from!
yes i'm using arm cortex m3 lm3s811 with usb port that also supports data stream through uart, default code for it is given as int main(void) { // Set the clocking to run directly from the crystal. SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ);
// Initialize the OLED display and write status. OSRAMInit(false); OSRAMStringDraw("UART echo: UART0", 0, 0); OSRAMStringDraw("115,200, 8-N-1", 6, 1);
// Enable the peripherals used by this example. SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0); SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
// Enable processor interrupts. IntMasterEnable();
// Set GPIO A0 and A1 as UART pins. GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
// Configure the UART for 115,200, 8-N-1 operation. UARTConfigSet(UART0_BASE, 115200, (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));
// Enable the UART interrupt. //IntEnable(INT_UART0); //UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);
// Prompt for text to be entered. // UARTSend((unsigned char *)"Enter text: ", 12); // UARTSend((unsigned char *) "def", 12);
// Enable the UART. UARTEnable(UART0_BASE);
// Check for characters. This will spin here until a character is placed // into the receive FIFO. //while(!UARTCharsAvail(UART0_BASE)) //{ //}
// Get the character(s) in the receive FIFO. //while(UARTCharNonBlockingGet(UART0_BASE)) //{ //} // I have to comment out those lines, because it goes into infinite loops.
// Put a character in the output buffer. // is the character 'c' being written to the UART? or is it in the buffer? do I need to enable FIFO buffers?
// Disable the UART. // Loop forever echoing data through the UART. while(1) {
} } while searching on internet if found charput and charget functions but don't know how to use it in my code