Other Parts Discussed in Thread: EK-TM4C123GXL, TM4C123GH6PM
Hi,
I am beginner of TIVA C and software.
Now I have EK-TM4C123GXL launch pad.
I would like to make one software. The function is the following.
* Blink LED on board.
* I can change the Blink period through the UAR communication. On Hyper Terminal, I can enter a number.
The following is my source code.
----------
#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
//#include "inc/tm4c123gh6pm.h"
#include "inc/hw_types.h"
#include "driverlib/timer.h"
int kazu=1;
uint32_t ui32Period;
uint32_t ui32Hozon;
//*****************************************************************************
//
// The Timer0 interrupt handler.
//
//*****************************************************************************
void Timer0IntHandler(void)
{
// All interrupt disable
IntMasterDisable();
// Clear the timer interrupt
TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
TimerDisable(TIMER0_BASE, TIMER_A);
// Read the current state of the GPIO pin and
// write back the opposite state
if(GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_2))
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0); //Turn off LED
}
else
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2); //Blink LED
}
TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period -1);
TimerEnable(TIMER0_BASE, TIMER_A);
IntMasterEnable();
}
//*****************************************************************************
//
// The UART interrupt handler.
//
//*****************************************************************************
void
UARTIntHandler(void)
{
// All interrupt disable
IntMasterDisable();
uint32_t ui32Status;
//
// Get the interrupt status.
//
ui32Status = UARTIntStatus(UART0_BASE, true);
//
// Clear the asserted interrupts.
//
UARTIntClear(UART0_BASE, ui32Status);
//
// Loop while there are characters in the receive FIFO.
//
while(UARTCharsAvail(UART0_BASE))
{
//
// Read the next character from the UART and write it back to the UART.
//
kazu = UARTCharGetNonBlocking(UART0_BASE);
// UARTCharPutNonBlocking(UART0_BASE, UARTCharGetNonBlocking(UART0_BASE));
UARTCharPutNonBlocking(UART0_BASE, kazu);
}
//Timer Re-setting
// TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
// TimerIntDisable(TIMER0_BASE, TIMER_A);
// SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
// TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
// ui32Period = (SysCtlClockGet() / UARTCharGetNonBlocking(UART0_BASE))/2;
// ui32Period = (SysCtlClockGet() / kazu)/2;
ui32Period = ui32Hozon;
ui32Period = ui32Period/kazu;
// TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period -1);
// IntEnable(INT_TIMER0A);
// TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
// TimerEnable(TIMER0_BASE, TIMER_A);
IntMasterEnable();
}
//*****************************************************************************
//
// Send a string to the UART.
//
//*****************************************************************************
void
UARTSend(const uint8_t *pui8Buffer, uint32_t ui32Count)
{
//
// Loop while there are more characters to send.
//
while(ui32Count--)
{
//
// Write the next character to the UART.
//
UARTCharPutNonBlocking(UART0_BASE, *pui8Buffer++);
}
}
//*****************************************************************************
//
// This example demonstrates how to send a string of data to the UART.
//
//*****************************************************************************
int main(void)
{
//
// Enable lazy stacking for interrupt handlers. This allows floating-point
// instructions to be used within interrupt handlers, but at the expense of
// extra stack usage.
//
// ROM_FPUEnable();
// ROM_FPULazyStackingEnable();
//
// Set the clocking to run directly from the crystal.
//
SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);
//SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
//
// Enable the GPIO port that is used for the on-board LED.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
//
// Enable the GPIO pins for the LED (PF2).
//
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);
//
// Enable the Timer0
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
ui32Period = (SysCtlClockGet() / 2)/2;
ui32Hozon = ui32Period;
TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period -1);
IntEnable(INT_TIMER0A);
TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
IntMasterEnable();
TimerEnable(TIMER0_BASE, TIMER_A);
//
// Turn on the LED --- added 20131014 by Michi
//
//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);
//
// 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.
//
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
//
// Configure the UART for 115,200, 8-N-1 operation.
//
UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 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((uint8_t *)"\033[2JEnter number--- ", 16);
//
// Loop forever echoing data through the UART.
//
while(1)
{
}
-----------
At first, LED on the board is bliking. But , when I put some number on Hyperterminal, LED blink is stopped.
The number I put on Hyperterminal is echo back correctly even though LED blinking stopped.
What is the wrong? I am beginner. So I don't know well how to handle interrupt.
Please give me advice.
Best regards,
Michi
