Msp432--timera (main instructions on how to implement an adjustable PWM)

---restore content starts---

16-bit Timer timer_a output Precision PWM

1. Mode operation

Timer_a support: Multi-channel capture/Compare, PWM output, timing
Simultaneous support: Interrupts

Timer_a Features: Asynchronous 16-bit timer/counter with four modes
                selectable, configurable clock resources
                Up to 7 configurable capture/comparison registers
               Features with PWM configuration
               asynchronous input and output self-locking
               Interrupt vector Register Fast decoding timer interrupt
2. Basic operating mode
Three modes: continuous count mode
           increment count mode
            Increment/Decrement count mode
Timera_initcompare () Initialize comparison mode  /* require necessary parameters */
TIMERA_GENERATEPWM () generate pwm        /* requires necessary parameters */

/* Configure Timera PWM parameters */
Timer_a_pwmconfig Pwmconfig =
{
TIMER_A_CLOCKSOURCE_SMCLK,
Timer_a_clocksource_divder_1,
32000,
Timer_a_capturecompare_register_0,
Timer_a_outputmode_toggle,
3200
};

Parameter details:
typedef struct _TIMER_A_PWMCONFIG
{
uint_fast16_t Clocksource; Clock resource, choose which clock to do the source of the timer, the same as 430 in the TASSELX
uint_fast16_t clocksourcedivider;//min. frequency
uint_fast16_t timerperiod;//Cycle
uint_fast16_t compareregister;//Select Comparison Register
uint_fast16_t compareoutputmode;//Comparison module output mode
uint_fast16_t dutycycle;//High level accounted for
} timer_a_pwmconfig;

/* Configure Timera PWM parameters */

/* Program Instance */

/* Configuration MCLK to Refo at 128Khz for LF mode
* Configuration SMCLK is 64Khz */
Map_cs_setreferenceoscillatorfrequency (cs_refo_128khz);
Map_cs_initclocksignal (CS_MCLK, Cs_refoclk_select, cs_clock_divider_1);
Map_cs_initclocksignal (CS_SMCLK, Cs_refoclk_select, cs_clock_divider_2);
Map_pcm_setpowerstate (PCM_AM_LF_VCORE0);
/* Set GPIO7.3 to PWM output pin, P1.1 bit key
* Interrupt */
Map_gpio_setasperipheralmodulefunctionoutputpin (GPIO_PORT_P7, gpio_pin3, gpio_primary_module_function);
Map_gpio_setasinputpinwithpullupresistor (GPIO_PORT_P1, gpio_pin1);
Map_gpio_clearinterruptflag (GPIO_PORT_P1, gpio_pin1);
Map_gpio_enableinterrupt (GPIO_PORT_P1, gpio_pin1);
/* Configure timer A for a period of 500ms, the initial duty cycle is 10% (3200 ticks) */
MAP_TIMER_A_GENERATEPWM (Timer_a0_module, &pwmconfig);

/* Program Instance */

3. Description of related library functions
(1) void Timer_a_clearcapurecompareinterrupt (uint32_t Timer,
uint_fast16_t capturecompareregister)//l1047 allow timed interrupts
Timer:timer_a0_module
Timer_a1_module
Timer_a2_module
Timer_a3_module
Capturecompareregister:timer_a_capturecompare_register_n (n=0,1,2,3,4,5,6)
Returns None
(2) void Timer_a_clearinterruptflag (uint32_t timer)//Clear Timer TAIFG interrupt flag bit
Timer: Slightly
Returns None
(3) void Timer_a_cleartimer (uint32_t timer)//restart/clear timer divider, counting direction, etc.
Timer: Slightly
Returns None
(4) void Timer_a_configurecontinuousmode (uint32_t Timer,
Const timer_a_continuousmodeconfig *CONFIG)//Configure timer A for continuous mode
Timer: Slightly
Returns None
Config: Data structure as follows
/********************************************
typedef struct _TIMER_A_CONTINUOUSMODECONFIG
{
uint_fast16_t clocksource;//Clock Resource, choose which clock to do the source of the timer, the same as 430 in the TASSELX
uint_fast16_t clocksourcedivider;//Crossover
uint_fast16_t timerinterruptenable_taie;//timer interrupt allow bit 0 Forbidden 1 allowed
uint_fast16_t timerclear;//Clear Bit
}timer_a_continuousmodeconfig;
********************************************/
(5) void Timer_a_configureupdownconfig (uint32_t Timer,
Const timer_a_upmodeconfig *config)//increment/Decrement count mode configuration
Timer: Slightly
Returns None
Config: Data structure as follows
/********************************************
typedef struct _TIMER_A_UPDOWNMODECONFIG
{
uint_fast16_t clocksource;//Ibid.
uint_fast16_t Clocksourcedivider;
uint_fast16_t Timerperiod;
uint_fast16_t Timerinterruptenable_taie;
uint_fast16_t Capturecompareinterruptenable_ccr0_ccie;
uint_fast16_t timerclear;
}timer_a_updownmodeconfig;
*********************************************/
(6) void Timer_a_configureupmode (uint32_t Timer,
Const timer_a_upmodeconfig *config)//Add-count mode configuration
Timer: Slightly
Returns None
Config: Data structure as follows
/********************************************
typedef struct _TIMER_A_UPMODECONFIG
{
uint_fast16_t clocksource;//Ibid.
uint_fast16_t Clocksourcedivider;
uint_fast16_t Timerperiod;
uint_fast16_t Timerinterruptenable_taie;
uint_fast16_t Capturecompareinterruptenable_ccr0_ccie;
uint_fast16_t timerclear;
}timer_a_upmodeconfig;
**********************************************/
(7) void Timer_a_disablecapturecompareinterrupt (uint32_t Timer,
uint_fast16_t capturecompareregister)//

The function part has not been continued---

The following is a modification of the official routine, which mainly produces an adjustable pwm with a period of 5ms,p2.4 output.

There are comment errors in the routines, and there are many problems to be aware of in the application.

For example interrupt function Port1_isr ()

The official routine does not declare an external file to be used, and the interrupt function is required to break the interface

Introduced into the MSP432_STARTUP_EWARM.C file __root const uvectorentry __vector_table[] @ ". Intvec" ={};

In Therefore, there will be some problems in the actual application, and private messages can be discussed together.

#include"Driverlib.h"#include"Delay.h"#include<stdint.h>#include<stdbool.h>int32_t Test=0; Timer_a_pwmconfig Pwmconfig={timer_a_clocksource_smclk, timer_a_clocksource_divider_1, the, timer_a_capturecompare_register_1, Timer_a_outputmode_reset_set,288}; //Configuring PWM Output ParametersintMainvoid) {Map_wdt_a_holdtimer ();    Map_cs_setreferenceoscillatorfrequency (cs_refo_128khz);    Map_cs_initclocksignal (CS_MCLK, Cs_refoclk_select, cs_clock_divider_1);    Map_cs_initclocksignal (CS_SMCLK, Cs_refoclk_select, cs_clock_divider_2);    Map_pcm_setpowerstate (PCM_AM_LF_VCORE0); Map_gpio_setasperipheralmodulefunctionoutputpin (GPIO_PORT_P2, Gpio_pin4, gpio_primary_module_function);//configuring P2.4 for Output PWMMap_gpio_setasinputpinwithpullupresistor (GPIO_PORT_P1, gpio_pin1);//P1.1 for KeysMap_gpio_clearinterruptflag (GPIO_PORT_P1, gpio_pin1);            Map_gpio_enableinterrupt (GPIO_PORT_P1, gpio_pin1);    Map_interrupt_enableinterrupt (INT_PORT1);    Map_interrupt_enablesleeponisrexit ();        Map_interrupt_enablemaster ();  while(1) {map_pcm_gotolpm0 (); }}extern voidPORT1_ISR (void)//Interrupt Function{uint32_t status=Map_gpio_getenabledinterruptstatus (GPIO_PORT_P1);    Map_gpio_clearinterruptflag (GPIO_PORT_P1, status); if(Status &gpio_pin1) {MAP_TIMER_A_GENERATEPWM (Timer_a0_module,&pwmconfig); if(Pwmconfig.dutycycle = =288) Pwmconfig.dutycycle= +; Elsepwmconfig.dutycycle+= +; Test=pwmconfig.dutycycle; }   }

---restore content ends---

Msp432--timera (main instructions on how to implement an adjustable PWM)