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kraus
2018-03-05 22:30:47 +01:00
parent 51ca3f942f
commit 9bfbc23b5f
4 changed files with 441 additions and 4 deletions
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sys/arm/stm32l031x6/gpio_pulse/main.c
+65 -2
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@@ -1,17 +1,80 @@
/* GPIO pulse generator project for the STM32L031 */
#include "stm32l031xx.h"
#include "core_cm0plus.h"
/*================================================*/
/* forward declaration */
void setGPIO( uint8_t n );
void clearGPIO(void);
/*================================================*/
/* lock, http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dai0321a/BIHEJCHB.html */
void get_lock(volatile int *Lock_Variable)
{ // Note: __LDREXW and __STREXW are CMSIS functions
int status = 0;
do
{
while (__LDREXW(&Lock_Variable) != 0)
; // Wait until Lock_Variable is free
status = __STREXW(1, &Lock_Variable); // Try to set Lock_Variable
} while (status!=0); //retry until lock successfully
__DMB(); // Do not start any other memory access
// until memory barrier is completed
return;
}
void free_lock(volatile int *Lock_Variable)
{ // Note: __LDREXW and __STREXW are CMSIS functions
__DMB(); // Ensure memory operations completed before
// releasing lock
Lock_Variable = 0;
return;
}
/*================================================*/
/* queue */
#define GPIO_QUEUE_MAX 128
uint8_t gpio_queue_mem[GPIO_QUEUE_MAX];
uint8_t gpio_queue_start = 0;
uint8_t gpio_queue_end = 0;
void addCmdToGPIOQueue(uint8_t n)
{
uint8_t pos;
pos = gpio_queue_end ;
pos++;
if ( pos >= GPIO_QUEUE_MAX )
pos = 0;
if ( pos == gpio_queue_start )
return;
gpio_queue_mem[pos] = n;
gpio_queue_end = pos;
}
uint8_t isGPIOQueueEmpty(void)
{
if ( gpio_queue_start == gpio_queue_end )
return 1;
return 0;
}
uint8_t getCmdFromGPIOQueue(void)
{
uint8_t r = gpio_queue_mem[gpio_queue_start];
if ( isGPIOQueueEmpty() )
return 255;
gpio_queue_start++;
if ( gpio_queue_start >= GPIO_QUEUE_MAX )
gpio_queue_start = 0;
return r;
}
/*================================================*/
volatile unsigned long SysTickCount = 0;
void __attribute__ ((interrupt, used)) SysTick_Handler(void)
{
SysTickCount++;