Hi members, I have a problem when I reload a timer0 into the current interrupt service.
I need make a calculus and reload the timer, but the timer is not reload at this time, is another (greather). I make any wrong pass?
Below put the program, in red the part of interest:
// TI File $Revision: /main/2 $
// Checkin $Date: July 30, 2009 18:45:40 $
//###########################################################################
//
// FILE: Example_2833xLedBlink.c
//
// TITLE: DSP2833x eZdsp LED Blink Getting Started Program.
//
// ASSUMPTIONS:
//
// This program requires the DSP2833x header files.
//
//
// As supplied, this project is configured for "boot to SARAM"
// operation. The 2833x Boot Mode table is shown below.
// For information on configuring the boot mode of an eZdsp,
// please refer to the documentation included with the eZdsp,
//
// $Boot_Table:
//
// GPIO87 GPIO86 GPIO85 GPIO84
// XA15 XA14 XA13 XA12
// PU PU PU PU
// ==========================================
// 1 1 1 1 Jump to Flash
// 1 1 1 0 SCI-A boot
// 1 1 0 1 SPI-A boot
// 1 1 0 0 I2C-A boot
// 1 0 1 1 eCAN-A boot
// 1 0 1 0 McBSP-A boot
// 1 0 0 1 Jump to XINTF x16
// 1 0 0 0 Jump to XINTF x32
// 0 1 1 1 Jump to OTP
// 0 1 1 0 Parallel GPIO I/O boot
// 0 1 0 1 Parallel XINTF boot
// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
// 0 0 1 1 Branch to check boot mode
// 0 0 1 0 Boot to flash, bypass ADC cal
// 0 0 0 1 Boot to SARAM, bypass ADC cal
// 0 0 0 0 Boot to SCI-A, bypass ADC cal
// Boot_Table_End$
//
// DESCRIPTION:
//
// This example configures CPU Timer0 for a 500 msec period, and toggles the GPIO32
// LED on the 2833x eZdsp once per interrupt. For testing purposes, this example
// also increments a counter each time the timer asserts an interrupt.
//
// Watch Variables:
// CpuTimer0.InterruptCount
//
// Monitor the GPIO32 LED blink on (for 500 msec) and off (for 500 msec) on the 2833x eZdsp.
//
//###########################################################################
// $TI Release: DSP2833x/DSP2823x C/C++ Header Files V1.31 $
// $Release Date: August 4, 2009 $
//###########################################################################
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
// Prototype statements for functions found within this file.
interrupt void cpu_timer0_isr(void);
int control=0; //CODIGO GUILLERMO
int contador=0;
//variables añadidas para la v4
float T=15; //T es el periodo que deseamos mantener constante
//el T no hay que ponerlo en 15e-6, ya que los tiempos que calcularemos
//estan en esa base
float num=0,den=0;
float calculo_resto_ton=0;
//fin variables añadidas v4
float tiempo=5;
void main(void)
{
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Initalize GPIO:
// This example function is found in the DSP2833x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio(); // Skipped for this example
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
DINT;
// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2833x_PieCtrl.c file.
InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example. This is useful for debug purposes.
// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
InitPieVectTable();
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.TINT0 = &cpu_timer0_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
// Step 4. Initialize the Device Peripheral. This function can be
// found in DSP2833x_CpuTimers.c
InitCpuTimers(); // For this example, only initialize the Cpu Timers
#if (CPU_FRQ_150MHZ)
// Configure CPU-Timer 0 to interrupt every 500 milliseconds:
// 150MHz CPU Freq, 50 millisecond Period (in uSeconds)
ConfigCpuTimer(&CpuTimer0, 150, 2.6);
#endif
#if (CPU_FRQ_100MHZ)
// Configure CPU-Timer 0 to interrupt every 500 milliseconds:
// 100MHz CPU Freq, 50 millisecond Period (in uSeconds)
ConfigCpuTimer(&CpuTimer0, 100, 500000);
#endif
// To ensure precise timing, use write-only instructions to write to the entire register. Therefore, if any
// of the configuration bits are changed in ConfigCpuTimer and InitCpuTimers (in DSP2833x_CpuTimers.h), the
// below settings must also be updated.
CpuTimer0Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0
// Step 5. User specific code, enable interrupts:
// Configure GPIO32 as a GPIO output pin
EALLOW;
//en el programa original es el puerto 32 que corresponde al led
GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0;
GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1;
GpioCtrlRegs.GPAMUX1.bit.GPIO2 = 0;
GpioCtrlRegs.GPADIR.bit.GPIO2 = 1;
EDIS;
// Enable CPU INT1 which is connected to CPU-Timer 0:
IER |= M_INT1;
// Enable TINT0 in the PIE: Group 1 interrupt 7
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
// Enable global Interrupts and higher priority real-time debug events:
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
// Step 6. IDLE loop. Just sit and loop forever (optional):
for(;;)
{
}
}
interrupt void cpu_timer0_isr(void)
{
GpioDataRegs.GPASET.bit.GPIO2 = 1; // on GPIO2
num=2475-2000;
den=2100-2000;
calculo_resto_ton=num/den;
ConfigCpuTimer(&CpuTimer0, 150,calculo_resto_ton );
// Acknowledge this interrupt to receive more interrupts from group 1
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
CpuTimer0Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0
GpioDataRegs.GPACLEAR.bit.GPIO2 = 1; //Set GPIO down
}
//===========================================================================
// No more.
//===========================================================================
