库函数操作
main.c
#include "stm32f10x.h"
#include "stdio.h"
#define PRINTF_ON 1
void RCC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(void);
void I2C_Configuration(void);
void NVIC_Configuration(void);
u8 I2C1_ADDRESS = 0x30; //7位 I2C 地址
u8 I2C2_ADDRESS = 0x31;
#define Size 4
vu8 I2C1_Buffer_Tx[Size] = {1,2,3,4};
vu8 I2C2_Buffer_Rx[Size] = {0};
u32 BufferSize = Size ;
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
I2C_Configuration();
NVIC_Configuration();
I2C_GenerateSTART(I2C1,ENABLE);
while(1);
}
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C1_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 200000;
I2C_Init(I2C1,&I2C_InitStructure);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C2_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 200000;
I2C_Init(I2C2,&I2C_InitStructure);
I2C_ITConfig(I2C1,I2C_IT_EVT|I2C_IT_BUF,ENABLE);
I2C_ITConfig(I2C2,I2C_IT_EVT|I2C_IT_BUF,ENABLE);
I2C_Cmd(I2C1,ENABLE);
I2C_Cmd(I2C2,ENABLE);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = I2C2_EV_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB , &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB , &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA , &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA , &GPIO_InitStructure);
}
void RCC_Configuration(void)
{
/* 定义枚举类型变量 HSEStartUpStatus */
ErrorStatus HSEStartUpStatus;
/* 复位系统时钟设置*/
RCC_DeInit();
/* 开启HSE*/
RCC_HSEConfig(RCC_HSE_ON);
/* 等待HSE起振并稳定*/
HSEStartUpStatus = RCC_WaitForHSEStartUp();
/* 判断HSE起是否振成功,是则进入if()内部 */
if(HSEStartUpStatus == SUCCESS)
{
/* 选择HCLK(AHB)时钟源为SYSCLK 1分频 */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* 选择PCLK2时钟源为 HCLK(AHB) 1分频 */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* 选择PCLK1时钟源为 HCLK(AHB) 2分频 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* 设置FLASH延时周期数为2 */
FLASH_SetLatency(FLASH_Latency_2);
/* 使能FLASH预取缓存 */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* 选择锁相环(PLL)时钟源为HSE 1分频,倍频数为9,则PLL输出频率为 8MHz * 9 = 72MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* 使能PLL */
RCC_PLLCmd(ENABLE);
/* 等待PLL输出稳定 */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
/* 选择SYSCLK时钟源为PLL */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* 等待PLL成为SYSCLK时钟源 */
while(RCC_GetSYSCLKSource() != 0x08);
}
/* 打开APB2总线上的GPIOA时钟*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_USART1, ENABLE);
//RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1|RCC_APB1Periph_I2C2,ENABLE);
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR|RCC_APB1Periph_BKP|RCC_APB1Periph_WWDG|RCC_APB1Periph_SPI2, ENABLE);
}
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART1 , &USART_ClockInitStructure);
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_Rx|USART_Mode_Tx;
USART_Init(USART1,&USART_InitStructure);
USART_Cmd(USART1,ENABLE);
}
#if PRINTF_ON
int fputc(int ch,FILE *f)
{
USART_SendData(USART1,(u8) ch);
while(USART_GetFlagStatus(USART1,USART_FLAG_TC) == RESET);
return ch;
}
#endif
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