185 lines
5.8 KiB
C
185 lines
5.8 KiB
C
/**
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******************************************************************
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* @file main.c
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* @author fire
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* @version V1.0
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* @date 2018-xx-xx
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* @brief FMC-SDRAM
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******************************************************************
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* @attention
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*
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* 实验平台:野火 STM32H750开发板
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* 论坛 :http://www.firebbs.cn
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* 淘宝 :http://firestm32.taobao.com
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*
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******************************************************************
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*/
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#include <stdlib.h>
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#include "stm32h7xx.h"
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#include "main.h"
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#include "./led/bsp_led.h"
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#include "./usart/bsp_usart.h"
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#include "./sdram/bsp_sdram.h"
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#include "./delay/core_delay.h"
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void SystemClock_Config(void);
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void Delay(__IO uint32_t nCount);
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//设置变量定义到“EXRAM”节区的宏
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#define __EXRAM __attribute__ ((section ("EXRAM")))
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//定义变量到SDRAM
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uint32_t testValue __EXRAM =7 ;
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//上述语句等效于：
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//uint32_t testValue __attribute__ ((section ("EXRAM"))) =7 ;
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//定义变量到SRAM
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uint32_t testValue2 =7 ;
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//定义数组到SDRAM
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uint8_t testGrup[3] __EXRAM ={1,2,3};
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//定义数组到SRAM
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uint8_t testGrup2[3] ={1,2,3};
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/**
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* @brief 主函数
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* @param 无
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* @retval 无
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*/
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int main(void)
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{
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uint32_t inerTestValue =10;
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uint32_t * pointer;
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/* 系统时钟初始化成400 MHz */
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SystemClock_Config();
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/* LED 端口初始化 */
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LED_GPIO_Config();
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/* 初始化串口 */
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UARTx_Config();
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printf("\r\nSCT文件应用——自动分配变量到SDRAM实验\r\n");
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printf("\r\n使用“ uint32_t inerTestValue =10; ”语句定义的局部变量：\r\n");
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printf("结果：它的地址为：0x%x,变量值为：%d\r\n",(uint32_t)&inerTestValue,inerTestValue);
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printf("\r\n使用“uint32_t testValue =7 ;”语句定义的全局变量：\r\n");
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printf("结果：它的地址为：0x%x,变量值为：%d\r\n",(uint32_t)&testValue,testValue);
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printf("\r\n使用“uint32_t testValue2 =0 ; ”语句定义的全局变量：\r\n");
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printf("结果：它的地址为：0x%x,变量值为：%d\r\n",(uint32_t)&testValue2,testValue2);
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printf("\r\n使用“uint8_t testGrup[100] ={0};”语句定义的全局数组：\r\n");
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printf("结果：它的地址为：0x%x,变量值为：%d,%d,%d\r\n",(uint32_t)&testGrup,testGrup[0],testGrup[1],testGrup[2]);
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printf("\r\n使用“uint8_t testGrup2[100] ={1,2,3};”语句定义的全局数组：\r\n");
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printf("结果：它的地址为：0x%x,变量值为：%d，%d,%d\r\n",(uint32_t)&testGrup2,testGrup2[0],testGrup2[1],testGrup2[2]);
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pointer = (uint32_t*)malloc(sizeof(uint32_t)*3);
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if(pointer != NULL)
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{
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*(pointer)=1;
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*(++pointer)=2;
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*(++pointer)=3;
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printf("\r\n使用“ uint32_t *pointer = (uint32_t*)malloc(sizeof(uint32_t)*3); ”动态分配的变量\r\n");
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printf("\r\n定义后的操作为：\r\n*(pointer++)=1;\r\n*(pointer++)=2;\r\n*pointer=3;");
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printf("\r\n结果：操作后它的地址为：0x%x,查看变量值操作：\r\n",(uint32_t)pointer);
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printf("*(pointer--)=%d, \r\n",*(pointer--));
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printf("*(pointer--)=%d, \r\n",*(pointer--));
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printf("*(pointer)=%d, \r\n",*(pointer));
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}
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else
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{
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printf("\r\n使用malloc动态分配变量出错！！！\r\n");
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}
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/*绿灯亮*/
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LED_BLUE;
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while(1);
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}
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/**
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* @brief System Clock 配置
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* system Clock 配置如下:
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* System Clock source = PLL (HSE)
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* SYSCLK(Hz) = 400000000 (CPU Clock)
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* HCLK(Hz) = 200000000 (AXI and AHBs Clock)
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* AHB Prescaler = 2
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* D1 APB3 Prescaler = 2 (APB3 Clock 100MHz)
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* D2 APB1 Prescaler = 2 (APB1 Clock 100MHz)
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* D2 APB2 Prescaler = 2 (APB2 Clock 100MHz)
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* D3 APB4 Prescaler = 2 (APB4 Clock 100MHz)
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* HSE Frequency(Hz) = 25000000
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* PLL_M = 5
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* PLL_N = 160
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* PLL_P = 2
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* PLL_Q = 4
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* PLL_R = 2
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* VDD(V) = 3.3
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* Flash Latency(WS) = 4
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct;
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RCC_OscInitTypeDef RCC_OscInitStruct;
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HAL_StatusTypeDef ret = HAL_OK;
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/*使能供电配置更新 */
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MODIFY_REG(PWR->CR3, PWR_CR3_SCUEN, 0);
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/* 当器件的时钟频率低于最大系统频率时，电压调节可以优化功耗，
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关于系统频率的电压调节值的更新可以参考产品数据手册。 */
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__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
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while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
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/* 启用HSE振荡器并使用HSE作为源激活PLL */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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RCC_OscInitStruct.HSEState = RCC_HSE_ON;
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RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
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RCC_OscInitStruct.CSIState = RCC_CSI_OFF;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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RCC_OscInitStruct.PLL.PLLM = 5;
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RCC_OscInitStruct.PLL.PLLN = 160;
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RCC_OscInitStruct.PLL.PLLP = 2;
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RCC_OscInitStruct.PLL.PLLR = 2;
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RCC_OscInitStruct.PLL.PLLQ = 2;
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RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
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RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_2;
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ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
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if(ret != HAL_OK)
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{
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while(1) { ; }
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}
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/* 选择PLL作为系统时钟源并配置总线时钟分频器 */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | \
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RCC_CLOCKTYPE_HCLK | \
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RCC_CLOCKTYPE_D1PCLK1 | \
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RCC_CLOCKTYPE_PCLK1 | \
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RCC_CLOCKTYPE_PCLK2 | \
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RCC_CLOCKTYPE_D3PCLK1);
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;
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RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;
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RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;
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RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;
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ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4);
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if(ret != HAL_OK)
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{
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while(1) { ; }
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}
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}
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/****************************END OF FILE***************************/
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