芯片解密STM32H750单片机LPUART+BDMA控制程序
芯片解密STM32H750 LPUART + BDMA 控制，认证 BDMA 使用
注意：芯片解密BDMA 只能使用 SRAM4
- #include "cspDwt.h"
- #include <stdio.h>
- #include "stm32h7xx_hal.h"
- /* mdk 下载需要 勾选 Stop After Reset */
- /* DWT 计时功能 */
- typedef struct
- {
- unsigned char count;
- unsigned int note[DWT_NOTE_MAX_NUMBER + 1];
-
- }Ctrl_t;
- static Ctrl_t s_ctrl = {0};
- static Ctrl_t *p = &s_ctrl;
- /* ----- DWT 延时 ----- */
- #define DWT_CR *(volatile uint32_t *)0xE0001000
- #define DWT_CYCCNT *(volatile uint32_t *)0xE0001004
- #define DEM_CR *(volatile uint32_t *)0xE000EDFC
- #define DEM_CR_TRCENA (1 << 24)
- #define DWT_CR_CYCCNTENA (1 << 0)
- /**
- * @brief DWT 延时初始化
- * @param void
- * @return void
- */
- void cDwt_Init(void)
- {
- DEM_CR |= DEM_CR_TRCENA;
- DWT_CR |= DWT_CR_CYCCNTENA;
- }
- /**
- * @brief DWT 微秒延时
- * @param US 延时计数
- * @return void
- */
- void cDwt_DelayUs(unsigned int us)
- {
- unsigned int startTime = DWT_CYCCNT;
- unsigned int time = us * (SystemCoreClock / (1000000));
- unsigned int endTime = startTime + time;
-
- if (endTime > startTime)
- {
- while ((DWT_CYCCNT > startTime) && (DWT_CYCCNT < endTime));
- }
- else
- {
- while ((DWT_CYCCNT > startTime) && (DWT_CYCCNT < endTime));
- }
- }
- /**
- * @brief DWT 毫秒延时
- * @param MS 延时计数
- * @return void
- */
- void cDwt_DelayMs(unsigned int ms)
- {
- for(unsigned int i = 0; i < ms; i++)
- {
- cDwt_DelayUs(1000);
- }
- }
- /* 计时结束清零 */
- void cDwt_Start(void)
- {
- p->count = 1;
- p->note[0] = DWT_CYCCNT;
- }
- /* 计时打点 */
- void cDwt_Note(void)
- {
- if (p->count >= DWT_NOTE_MAX_NUMBER)
- {
- printf("%s 计时失败 计时点不足\r\n", __func__);
- }
-
- p->note[p->count] = DWT_CYCCNT;
- p->count++;
- }
- /* 计时结束 + 打印时间参数 */
- void cDwt_End(void)
- {
- unsigned int coreClock = HAL_RCC_GetSysClockFreq() / 1000000;
- unsigned int realCount = 0;
- unsigned int totalUs = 0;
- unsigned int showUs = 0;
- unsigned int showMs = 0;
- unsigned int showS = 0;
- for (int i = 0; i < p->count; i++)
- {
- /* 判断时钟是否重新计时 */
- if (p->note[i] < p->note[0])
- {
- realCount = 0xFFFFFFFF - p->note[0] + p->note[i];
- }
- else
- {
- realCount = p->note[i] - p->note[0];
- }
-
- totalUs = realCount / coreClock;
- showS = totalUs / 1000000;
- showMs = (totalUs - showS * 1000000) / 1000;
- showUs = (totalUs - showS * 1000000 - showMs * 1000);
- printf("Time[%d]-[%d]s-[%d]ms-[%d]us\r\n", i, showS, showMs, showUs);
- }
- }
芯片解密
