CC2541: CC2541 timer 4 setup and interrupt function

BRUNO CHAVES said:

Part Number: CC2541

Hi! I'm  trying to use timer 4 to generate an 1MHz interrupt to count microsseconds precisely, however it's not working well. Here's my code:

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//Timer 4 Setup function void Timer4_init(void) {     //******************** Timer4, channel     //  Timer 4 channel 0 compare value.          CLKCONCMD = (CLKCONCMD & ~CLKCON_TICKSPD) | CLKCON_TICKSPD_32M;     T4IE = 1;   /***************************************************************************        * Timer 4 setup        *        * Timer 4 channel 0 compare value. Initiates the Timer terminal count value        * to 224. This value is reseted at each Timer compare match interrupt.        */     T4CC0 = e0;//224 -> 256 - (32MHz/(Prescaler*Target_Frequency)): Target_frequency=1MHz     /* Timer 4 channel 0 (T4CCTL0) configuration:       * - Channel 0 interrupt enabled.       * - Compare mode.       */       T4CCTL0 = T4CCTLn_IM | T4CCTLn_MODE;     /* Timer 4 control (T4CTL) configuration:      * - Prescaler divider value: 1.      * - Modulo mode.      * The Timer is also cleared and started.      */     T4CTL = T4CTL_DIV_1 | T4CTL_MODE_MODULO | T4CTL_CLR | T4CTL_START; } //Interrupt function #pragma vector = T4_VECTOR  __interrupt void t4_isr(void) {   //     // Clears the module interrupt flag.   T4OVFIF = 0;        static uint16 micros = 0;       micros ++;      // Clears the CPU interrupt flag.   T4IF = 0;     }

BRUNO CHAVES said:

Part Number: CC2541

Hi! I'm  trying to use timer 4 to generate an 1MHz interrupt to count microsseconds precisely, however it's not working well. Here's my code:

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//Timer 4 Setup function void Timer4_init(void) {     //******************** Timer4, channel     //  Timer 4 channel 0 compare value.          CLKCONCMD = (CLKCONCMD & ~CLKCON_TICKSPD) | CLKCON_TICKSPD_32M;     T4IE = 1;   /***************************************************************************        * Timer 4 setup        *        * Timer 4 channel 0 compare value. Initiates the Timer terminal count value        * to 224. This value is reseted at each Timer compare match interrupt.        */     T4CC0 = e0;//224 -> 256 - (32MHz/(Prescaler*Target_Frequency)): Target_frequency=1MHz     /* Timer 4 channel 0 (T4CCTL0) configuration:       * - Channel 0 interrupt enabled.       * - Compare mode.       */       T4CCTL0 = T4CCTLn_IM | T4CCTLn_MODE;     /* Timer 4 control (T4CTL) configuration:      * - Prescaler divider value: 1.      * - Modulo mode.      * The Timer is also cleared and started.      */     T4CTL = T4CTL_DIV_1 | T4CTL_MODE_MODULO | T4CTL_CLR | T4CTL_START; } //Interrupt function #pragma vector = T4_VECTOR  __interrupt void t4_isr(void) {   //     // Clears the module interrupt flag.   T4OVFIF = 0;        static uint16 micros = 0;       micros ++;      // Clears the CPU interrupt flag.   T4IF = 0;     }

Please take a look at the examples found here:

Siri