Tinkering TI MSP430F5529
|
|
WDTA as an Interval TimerWDTA as an Interval TimerWDTA as an Interval Timer
As mentioned before, WDTA can be used like an ordinary interval timer if watchdog function is not needed. This is strictly a secondary property of WDTA and there are some limitations of it. Still I would thank TI for this dexterity because sometimes in big projects people tend to run out of timers.
Code Example
#include "driverlib.h"
void GPIO_init(void);
void WDTA_init(void);
#pragma vector = WDT_VECTOR
__interrupt void WDT_A_ISR (void)
{
GPIO_toggleOutputOnPin( GPIO_PORT_P1,
GPIO_PIN0);
GPIO_toggleOutputOnPin( GPIO_PORT_P4,
GPIO_PIN7);
}
void main(void)
{
WDT_A_hold(WDT_A_BASE);
GPIO_init();
WDTA_init();
while(1)
{
};
}
void GPIO_init(void)
{
GPIO_setAsOutputPin(GPIO_PORT_P1,
GPIO_PIN0);
GPIO_setDriveStrength(GPIO_PORT_P1,
GPIO_PIN0,
GPIO_FULL_OUTPUT_DRIVE_STRENGTH);
GPIO_setAsOutputPin(GPIO_PORT_P4,
GPIO_PIN7);
GPIO_setDriveStrength(GPIO_PORT_P4,
GPIO_PIN7,
GPIO_FULL_OUTPUT_DRIVE_STRENGTH);
GPIO_setOutputHighOnPin(GPIO_PORT_P1,
GPIO_PIN0);
GPIO_setOutputLowOnPin(GPIO_PORT_P4,
GPIO_PIN7);
}
void WDTA_init(void)
{
WDT_A_initIntervalTimer(WDT_A_BASE,
WDT_A_CLOCKSOURCE_SMCLK,
WDT_A_CLOCKDIVIDER_512K);
SFR_clearInterrupt(SFR_WATCHDOG_INTERVAL_TIMER_INTERRUPT);
SFR_enableInterrupt(SFR_WATCHDOG_INTERVAL_TIMER_INTERRUPT);
WDT_A_start(WDT_A_BASE);
__enable_interrupt();
}
Hardware Setup
Explanation
The demo here is a simple LED toggler. On-board LEDs are used. UCS clock settings are untouched and so all clocks are in their defaults. Firstly, WDTA is stopped to prevent a software reset.
WDT_A_hold(WDT_A_BASE);
Configuration of WDTA in interval mode is nothing different from WDTA in watchdog mode. We have to specify WDTA clock source and its divider. Here the clock source is SMCLK and the divider is 512000. Since we are using default clock setting, SMCLK is running at about 1 MHz speed. Thus, dividing this speed with 512000 results in approximately 500 ms interval. We cannot access WDTA counter and so we will have to use interrupt method when using WDTA in interval mode. Thus, at every 500 ms an interrupt is triggered.
void WDTA_init(void)
{
WDT_A_initIntervalTimer(WDT_A_BASE, WDT_A_CLOCKSOURCE_SMCLK, WDT_A_CLOCKDIVIDER_512K);
SFR_clearInterrupt(SFR_WATCHDOG_INTERVAL_TIMER_INTERRUPT);
SFR_enableInterrupt(SFR_WATCHDOG_INTERVAL_TIMER_INTERRUPT);
WDT_A_start(WDT_A_BASE);
__enable_interrupt();
}
Inside the interrupt, on-board LED states are toggled.
#pragma vector = WDT_VECTOR
__interrupt void WDT_A_ISR (void)
{
GPIO_toggleOutputOnPin( GPIO_PORT_P1, GPIO_PIN0);
GPIO_toggleOutputOnPin( GPIO_PORT_P4, GPIO_PIN7);
}
There is nothing done in the main loop and so it is empty.
Demo
|
|
I am surprised and happy to find this tutorial on the F5529 as TI makes a lot of different devices.
Thank you very much for putting in the extra knowledge in each segment, made reading worthwhile.
Good Work!
lovely tutorial but to be honest I don’t think I’d be investing my time on this board to start with it’s not cheap and readily available as the stm32 boards can you please do more tutorials on stm32 board’s and the stc micros thanks
Hello, I try to program MSP430FR6047 but i get error “the debug interface to the device has been secured”. when flashing using uniflash and when program using CCS this happen. can you help me to solve this problem
You can try “On connect, erase user code and unlock the device” option.
Pingback: Tinkering TI MSP430F5529 – gStore
Hello
I am doing project of msp430g2553 interface(using i2c communication) with temp 100(temperature sensor) and try to read the temperature in dispaly(16*2) but didn’t get the out put (using code composer studio) can u share me any example code for this project
Thank you sir,
Which sensor? Did you use pullup resistors for SDA-SCL pins?
Where is lcd_print.h?
All files and docs are here:
https://libstock.mikroe.com/projects/view/3233/tinkering-ti-msp430f5529
You want the truth? TI makes and sell “underpowered micros”, you know? Low everything, not only the power but also peripherals. So the price is not justified.
Otherwise, if I’ll move there, I’ll introduce them to my small hobby projects – there are still some advantages.
I may even make a visual configuration tool of my own for them…
Yeah the prices of TI products are higher than other manufacturers but I don’t think the hardware peripherals are inferior.
Not inferior but in not enough numbers compared to STM32.
True