I2C_InitTypeDef 解析
时间: 2024-06-15 16:06:11 浏览: 12
I2C_InitTypeDef是一个结构体类型,用于配置I2C总线的初始化参数。它包含了以下成员变量:
1. uint32_t ClockSpeed:表示I2C总线的时钟速度,单位为Hz。
2. uint32_t DutyCycle:表示I2C总线的占空比,可以是I2C_DUTYCYCLE_2或者I2C_DUTYCYCLE_16_9。
3. uint32_t OwnAddress1:表示I2C总线的设备地址,用于标识当前设备。
4. uint32_t AddressingMode:表示I2C总线的寻址模式,可以是I2_ADDRESSINGMODE_7BIT或者I2C_ADDRESSINGMODE_10BIT。
5. uint32_t DualAddressMode:表示I2C总线的双地址模式,可以是I2C_DUALADDRESS_DISABLE或者I2C_DUALADDRESS_ENABLE。
6. uint32_t OwnAddress2:表示I2C总线的第二个设备地址,仅在双地址模式下有效。
7. uint32_t GeneralCallMode:表示I2C总线的广播模式,可以是I2C_GENERALCALL_DISABLE或者I2C_GENERALCALL_ENABLE。
8. uint32_t NoStretchMode:表示I2C总线的时钟拉伸模式,可以是I2C_NOSTRETCH_DISABLE或者I2C_NOSTRETCH_ENABLE。
通过配置这些成员变量,可以实现对I2C总线的初始化设置。例如,可以设置时钟速度、设备地址、寻址模式等参数。
相关问题
stm32温度传感器代码
STM32微控制器中使用温度传感器通常涉及到I2C、SPI或其他接口来读取外部传感器的数据。以下是一个简化的示例,展示如何在STM32F103C8T6(假设使用的是CubeMX配置)上通过I2C连接一个常见温度传感器如DS18B20或LMT85,并读取其测量值:
```c
#include "stm32f10x.h"
#include "i2c.h"
#include "ds18b20.h" // 假设是DS18B20库
// I2C初始化函数
void i2cInit(void) {
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
// ... (这里设置I2C的相关GPIO配置)
// 初始化I2C
I2C_DeInit(I2C1); // 假设使用I2C1
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; // 配置为I2C模式
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; // 配置拉低电平时间
I2C_InitStructure.I2C_OwnAddress1 = 0x00; // 设置地址(取决于传感器)
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; // 应答模式
I2C_InitStructure.I2C_AutoStart = I2C_AutoStart_Enable;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = I2C_DigitalFilter_Enable;
HAL_I2C_Init(&hi2c1, &I2C_InitStructure);
}
// 读取温度传感器数据
float readTemperature(void) {
uint16_t data;
float temperature;
// ... (这里设置I2C从设备地址和读取命令)
HAL_I2C_Master_Transmit(&hi2c1, slave_address, data, 2,延时ms); // 延时可能根据具体协议调整
// ... (解析收到的16位数据,计算温度)
temperature = ((data << 8) | data) * DS18B20_TO_CELSIUS_FACTOR;
return temperature;
}
int main(void) {
i2cInit();
while (1) {
float temp = readTemperature();
printf("Temperature: %.2f°C\n", temp);
}
return 0;
}
```
基于stm32的ps2手柄代码
以下是基于STM32的PS2手柄代码,其中使用了SPI和定时器来读取和解析手柄数据:
```c
#include "stm32f10x.h"
#define SPI_CS_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_4)
#define SPI_CS_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_4)
#define PS2_CMD_ENTER_CFG 0x01
#define PS2_CMD_EXIT_CFG 0x81
#define PS2_CMD_ENABLE 0x43
#define PS2_CMD_SET_MODE 0x44
#define PS2_CMD_POLL 0x01
#define PS2_MODE_ANALOG 0x01
#define PS2_MODE_DIGITAL 0x00
#define PS2_ACKNOWLEDGE 0x00
#define PS2_COMPLETE 0x01
#define PS2_ERROR 0x02
#define PS2_BUTTON_SELECT 0x0001
#define PS2_BUTTON_L3 0x0002
#define PS2_BUTTON_R3 0x0004
#define PS2_BUTTON_START 0x0008
#define PS2_BUTTON_UP 0x0010
#define PS2_BUTTON_RIGHT 0x0020
#define PS2_BUTTON_DOWN 0x0040
#define PS2_BUTTON_LEFT 0x0080
#define PS2_BUTTON_L2 0x0100
#define PS2_BUTTON_R2 0x0200
#define PS2_BUTTON_L1 0x0400
#define PS2_BUTTON_R1 0x0800
#define PS2_BUTTON_TRIANGLE 0x1000
#define PS2_BUTTON_CIRCLE 0x2000
#define PS2_BUTTON_CROSS 0x4000
#define PS2_BUTTON_SQUARE 0x8000
uint8_t PS2_Cmd(uint8_t cmd);
void PS2_Init(void);
void PS2_ReadData(void);
void PS2_SetMode(uint8_t mode);
void PS2_EnterCfg(void);
void PS2_ExitCfg(void);
void PS2_Enable(void);
uint16_t PS2_Buffer;
uint8_t PS2_Ready = 0;
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBase_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOB, &GPIO_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &SPI_InitStructure);
TIM_TimeBase_InitStructure.TIM_Period = 9999;
TIM_TimeBase_InitStructure.TIM_Prescaler = 71;
TIM_TimeBase_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBase_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM4, &TIM_TimeBase_InitStructure);
TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM4, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
PS2_Init();
while (1)
{
if (PS2_Ready)
{
// 处理手柄数据
PS2_Ready = 0;
}
}
}
void PS2_Init(void)
{
PS2_EnterCfg();
PS2_Cmd(PS2_CMD_SET_MODE);
PS2_Cmd(PS2_MODE_ANALOG);
PS2_ExitCfg();
PS2_Enable();
}
uint8_t PS2_Cmd(uint8_t cmd)
{
uint8_t i, ack;
SPI_CS_LOW();
SPI_I2S_SendData(SPI1, cmd);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
ack = SPI_I2S_ReceiveData(SPI1);
SPI_CS_HIGH();
for (i = 0; i < 10; i++);
return ack;
}
void PS2_EnterCfg(void)
{
PS2_Cmd(PS2_CMD_ENTER_CFG);
}
void PS2_ExitCfg(void)
{
PS2_Cmd(PS2_CMD_EXIT_CFG);
}
void PS2_Enable(void)
{
PS2_Cmd(PS2_CMD_ENABLE);
}
void PS2_SetMode(uint8_t mode)
{
PS2_Cmd(PS2_CMD_SET_MODE);
PS2_Cmd(mode);
}
void PS2_ReadData(void)
{
static uint8_t ps2_data[9];
static uint8_t byte_count = 0;
uint8_t byte, i;
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
SPI_I2S_SendData(SPI1, PS2_CMD_POLL);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
byte = SPI_I2S_ReceiveData(SPI1);
ps2_data[byte_count] = byte;
byte_count++;
if (byte_count == 9)
{
byte_count = 0;
if (ps2_data[0] == 0x01 && ps2_data[1] == 0x42 && ps2_data[2] == 0x5a)
{
PS2_Buffer = 0;
for (i = 2; i < 8; i++)
{
PS2_Buffer <<= 8;
PS2_Buffer |= ps2_data[i];
}
PS2_Ready = 1;
}
}
GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
void TIM4_IRQHandler(void)
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
PS2_ReadData();
}
}
```
其中,PS2_Init()函数用于初始化手柄,PS2_ReadData()函数用于读取手柄数据。在主函数中,通过检测PS2_Ready是否为1来判断是否有新的手柄数据可用。可以根据PS2_Buffer中的值来判断手柄按键状态。