103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
#include <stdint.h>
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#include "systems.h"
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#include <string.h>
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#include <core_cm4.h>
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#include <core_cmFunc.h>
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extern RCC_ClocksTypeDef RCC_Clocks;
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//For precise timing.
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volatile unsigned int *DWT_CYCCNT = (volatile unsigned int *)0xE0001004; //address of the register
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volatile unsigned int *SCB_DEMCR = (volatile unsigned int *)0xE000EDFC; //address of the register
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volatile unsigned int *DWT_CONTROL = (volatile unsigned int *)0xE0001000; //address of the register
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void send_openocd_command(int command, void *message)
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{
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#ifdef DEBUG
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asm("mov r0, %[cmd];"
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"mov r1, %[msg];"
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"bkpt #0xAB"
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:
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: [cmd] "r" (command), [msg] "r" (message)
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: "r0", "r1", "memory");
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#endif
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}
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void send_text( const char * text )
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{
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uint32_t m[] = { 2, (uint32_t)text, strlen(text) };
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send_openocd_command(0x05, m);
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}
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int _write (int fd, const void *buf, size_t count)
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{
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uint32_t m[] = { 2, (uint32_t)buf, count };
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send_openocd_command(0x05, m);
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}
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void * _sbrk(int incr) {
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extern char _ebss; // Defined by the linker
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == 0) {
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heap_end = &_ebss;
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}
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prev_heap_end = heap_end;
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char * stack = (char*) __get_MSP();
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if (heap_end + incr > stack)
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{
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return (void*)(-1);
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}
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heap_end += incr;
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return (void*) prev_heap_end;
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}
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void _delay_us(uint32_t us) {
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if( us ) us--; //Approximate extra overhead time.
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us *= RCC_Clocks.HCLK_Frequency/1000000;
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*SCB_DEMCR = *SCB_DEMCR | 0x01000000;
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*DWT_CYCCNT = 0; // reset the counter
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*DWT_CONTROL = *DWT_CONTROL | 1 ; // enable the counter
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while( *DWT_CYCCNT < us );
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}
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void ConfigureLED()
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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/* Enable the GPIO_LED Clock */
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#ifdef STM32F30X
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
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/* Configure the GPIO_LED pin */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //| GPIO_Pin_15 (15 = CTS)
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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#elif defined( STM32F40_41xxx )
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RCC_AHB1PeriphClockCmd( LED_AHB_PORT, ENABLE);
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/* Configure the GPIO_LED pin */
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GPIO_InitStructure.GPIO_Pin = (1<<LEDPIN);
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_Init(LEDPORT, &GPIO_InitStructure);
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#endif
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}
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