CMSIS-Core (Cortex-M): Basic CMSIS Example

| CMSIS-Core (Cortex-M) Version 5.3.0 CMSIS-Core support for Cortex-M processor-based devices

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Basic CMSIS Example

A typical example for using the CMSIS layer is provided below. The example is based on a STM32F10x Device.

#include <stm32f10x.h> // File name depends on device used
uint32_t volatile msTicks; // Counter for millisecond Interval
void SysTick_Handler (void) { // SysTick Interrupt Handler
msTicks++; // Increment Counter
}
void WaitForTick (void) {
uint32_t curTicks;
curTicks = msTicks; // Save Current SysTick Value
while (msTicks == curTicks) { // Wait for next SysTick Interrupt
__WFE (); // Power-Down until next Event/Interrupt
}
}
void TIM1_UP_IRQHandler (void) { // Timer Interrupt Handler
; // Add user code here
}
void timer1_init(int frequency) { // Set up Timer (device specific)
NVIC_SetPriority (TIM1_UP_IRQn, 1); // Set Timer priority
NVIC_EnableIRQ (TIM1_UP_IRQn); // Enable Timer Interrupt
}
void Device_Initialization (void) { // Configure & Initialize MCU
if (SysTick_Config (SystemCoreClock / 1000)) { // SysTick 1mSec
: // Handle Error
}
timer1_init (); // setup device-specific timer
}
// The processor clock is initialized by CMSIS startup + system file
void main (void) { // user application starts here
Device_Initialization (); // Configure & Initialize MCU
while (1) { // Endless Loop (the Super-Loop)
__disable_irq (); // Disable all interrupts
Get_InputValues (); // Read Values
__enable_irq (); // Enable all interrupts
Calculation_Response (); // Calculate Results
Output_Response (); // Output Results
WaitForTick (); // Synchronize to SysTick Timer
}
}

CMSIS-Pack provides the #define CMSIS_header_file in RTE_Components.h which gives you access to the device.h file of a project. This allows you to generate generic software components that use the device selected in a project.

#include "RTE_Components.h" // include information about project configuration
#include CMSIS_device_header // include <device>.h file