芯片解密stm32 USART的使用源程序
芯片解密#include "stm32f10x_lib.h" 芯片解密#include"stdio.h" void RCC_Configuration(void) { ErrorStatus HSEStartUpStatus; /* RCC system reset(for debug purpose) */ RCC_DeInit(); //将外设RCC 寄存器重设为缺省值 /* Enable HSE */ RCC_HSEConfig(RCC_HSE_ON);//使能外部时钟 /* Wait till HSE is ready */ HSEStartUpStatus = RCC_WaitForHSEStartUp();//等待外部时钟就绪 if(HSEStartUpStatus == SUCCESS) { /* Enable Prefetch Buffer 启用预取缓冲器 */ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); /* Flash 2 wait state FLASH设置2个等待周期*/ FLASH_SetLatency(FLASH_Latency_2); /* HCLK（AHB时钟） = SYSCLK 设置AHB时钟*/ RCC_HCLKConfig(RCC_SYSCLK_Div1);//AHB(Advanced High performance Bus)系统总线 //APB(Advanced Peripheral Bus)外围总线 /* PCLK2 = HCLK PCLK2时钟=主时钟*/ RCC_PCLK2Config(RCC_HCLK_Div1); /* PCLK1 = HCLK/2 PCLK1时钟为主时钟1/2*/ RCC_PCLK1Config(RCC_HCLK_Div2); /* PLLCLK = 8MHz * 9 = 72 MHz 设置时钟为72M，设置PLL时钟源及倍频系数（<=72M）*/ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); /* Enable PLL 使能PLL*/ RCC_PLLCmd(ENABLE); /* Wait till PLL is ready */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); /* Select PLL as system clock source */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* Wait till PLL is used as system clock source */ while(RCC_GetSYSCLKSource() != 0x08); } } void USART_configuration(void) { USART_InitTypeDef USART_InitStructure; USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; USART_Init(USART1, &USART_InitStructure); USART_Cmd(USART1, ENABLE); } void USART_ClockInitconfiguration(void) { USART_ClockInitTypeDef USART_ClockInitStructuree; USART_ClockInitStructuree.USART_Clock = USART_Clock_Disable; USART_ClockInitStructuree.USART_CPOL = USART_CPOL_High; USART_ClockInitStructuree.USART_CPHA = USART_CPHA_1Edge; USART_ClockInitStructuree.USART_LastBit = USART_LastBit_Enable; USART_ClockInit(USART1, &USART_ClockInitStructuree); } void GPIO_configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1 , ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); } |
芯片解密
