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器件型号：TMS320F28P650DK 工具与软件：
大家好！
如何更改计时器周期以每100ns 获得计时器中断？
不幸的是、我只能设置最小值2us。
我的当前代码：
//#############################################################################
//
// FILE: timer_ex1_cputimers.c
//
// Included Files
//
#include "driverlib.h"
#include "device.h"
//
// Function Prototypes
//
__interrupt void cpuTimer0ISR(void);
void initCPUTimers(void);
void configCPUTimer(uint32_t, float, float);
//
// Main
//
void main(void)
{
//
// Initializes device clock and peripherals
//
Device_init();
Device_initGPIO();
//
// Initializes PIE and clears PIE registers. Disables CPU interrupts.
//
Interrupt_initModule();
//
// Initializes the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
//
Interrupt_initVectorTable();
//
// ISRs for each CPU Timer interrupt
//
Interrupt_register(INT_TIMER0, &cpuTimer0ISR);
//
// Initializes the Device Peripheral. For this example, only initialize the
// Cpu Timers.
//
initCPUTimers();
//
// Configure CPU-Timer 0 to interrupt every ... seconds:
// 1 Period respectively (in uSeconds)
//
configCPUTimer(CPUTIMER0_BASE, DEVICE_SYSCLK_FREQ, 0.2);
//
// 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, the below settings must also
// be updated.
//
CPUTimer_enableInterrupt(CPUTIMER0_BASE);
//
// Enables CPU int1 which are connected to CPU-Timer 0, respectively.
// Enable TINT0 in the PIE: Group 1 interrupt 7
//
Interrupt_enable(INT_TIMER0);
//
// Starts CPU-Timer 0.
//
CPUTimer_startTimer(CPUTIMER0_BASE);
//
// Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
//
EINT;
ERTM;
GPIO_writePin(0, 1);
GPIO_setPinConfig(GPIO_0_GPIO0);
GPIO_setDirectionMode(0, GPIO_DIR_MODE_OUT);
//
// IDLE loop. Just sit and loop forever (optional)
//
while (1)
{
}
}
//
// initCPUTimers - This function initializes all three CPU timers
// to a known state.
//
void initCPUTimers(void)
{
//
// Initialize timer period to maximum
//
CPUTimer_setPeriod(CPUTIMER0_BASE, 0xFFFFFFFF);
//
// Initialize pre-scale counter to divide by 1 (SYSCLKOUT)
//
CPUTimer_setPreScaler(CPUTIMER0_BASE, 0);
//
// Make sure timer is stopped
//
CPUTimer_stopTimer(CPUTIMER0_BASE);
//
// Reload all counter register with period value
//
CPUTimer_reloadTimerCounter(CPUTIMER0_BASE);
}
//
// configCPUTimer - This function initializes the selected timer to the
// period specified by the "freq" and "period" parameters. The "freq" is
// entered as Hz and the period in uSeconds. The timer is held in the stopped
// state after configuration.
//
void configCPUTimer(uint32_t cpuTimer, float freq, float period)
{
uint32_t temp;
//
// Initialize timer period:
//
temp = (uint32_t) ((freq / 1000000) * period);
CPUTimer_setPeriod(cpuTimer, temp - 1);
//
// Set pre-scale counter to divide by 1 (SYSCLKOUT):
//
CPUTimer_setPreScaler(cpuTimer, 0);
//
// Initializes timer control register. The timer is stopped, reloaded,
// free run disabled, and interrupt enabled.
// Additionally, the free and soft bits are set
//
CPUTimer_stopTimer(cpuTimer);
CPUTimer_reloadTimerCounter(cpuTimer);
CPUTimer_setEmulationMode(cpuTimer,
CPUTIMER_EMULATIONMODE_STOPAFTERNEXTDECREMENT);
CPUTimer_enableInterrupt(cpuTimer);
}
//
// cpuTimer0ISR
//
__interrupt void cpuTimer0ISR(void)
{
GPIO_writePin(0, 1);
GPIO_writePin(0, 0);
//
// Acknowledge this interrupt to receive more interrupts from group 1
//
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP1);
}
//
// End of File
//
此致
