基于HAL库自定义PB7,PB9开漏输出高电平模拟IIC时序驱动SS1623
时间: 2024-01-03 20:03:56 浏览: 195
基于HAL库的信号源驱动
首先需要了解一下SS1623的时序要求,根据其时序要求,可以自定义PB7和PB9口的IIC驱动程序。以下是一份基于HAL库的代码示例:
```c
#include "stm32f1xx_hal.h"
#define IIC_SCL_PIN GPIO_PIN_7
#define IIC_SDA_PIN GPIO_PIN_9
#define IIC_SCL_GPIO GPIOB
#define IIC_SDA_GPIO GPIOB
#define IIC_SCL_HIGH() HAL_GPIO_WritePin(IIC_SCL_GPIO, IIC_SCL_PIN, GPIO_PIN_SET)
#define IIC_SCL_LOW() HAL_GPIO_WritePin(IIC_SCL_GPIO, IIC_SCL_PIN, GPIO_PIN_RESET)
#define IIC_SDA_HIGH() HAL_GPIO_WritePin(IIC_SDA_GPIO, IIC_SDA_PIN, GPIO_PIN_SET)
#define IIC_SDA_LOW() HAL_GPIO_WritePin(IIC_SDA_GPIO, IIC_SDA_PIN, GPIO_PIN_RESET)
#define IIC_SDA_READ() HAL_GPIO_ReadPin(IIC_SDA_GPIO, IIC_SDA_PIN)
void IIC_Delay(uint16_t us)
{
uint16_t i = 0;
while (us--)
{
i = 10;
while (i--)
;
}
}
void IIC_Start(void)
{
IIC_SDA_HIGH();
IIC_SCL_HIGH();
IIC_Delay(4);
IIC_SDA_LOW();
IIC_Delay(4);
IIC_SCL_LOW();
IIC_Delay(4);
}
void IIC_Stop(void)
{
IIC_SCL_LOW();
IIC_SDA_LOW();
IIC_Delay(4);
IIC_SCL_HIGH();
IIC_Delay(4);
IIC_SDA_HIGH();
IIC_Delay(4);
}
void IIC_Ack(void)
{
IIC_SCL_LOW();
IIC_SDA_LOW();
IIC_Delay(4);
IIC_SCL_HIGH();
IIC_Delay(4);
IIC_SCL_LOW();
IIC_Delay(4);
}
void IIC_NAck(void)
{
IIC_SCL_LOW();
IIC_SDA_HIGH();
IIC_Delay(4);
IIC_SCL_HIGH();
IIC_Delay(4);
IIC_SCL_LOW();
IIC_Delay(4);
}
uint8_t IIC_WaitAck(void)
{
uint8_t ucErrTime = 0;
IIC_SCL_LOW();
IIC_SDA_HIGH();
IIC_Delay(1);
IIC_SCL_HIGH();
IIC_Delay(1);
while (IIC_SDA_READ())
{
ucErrTime++;
if (ucErrTime > 250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL_LOW();
return 0;
}
void IIC_SendByte(uint8_t ucData)
{
uint8_t i = 8;
while (i--)
{
IIC_SCL_LOW();
if (ucData & 0x80)
IIC_SDA_HIGH();
else
IIC_SDA_LOW();
ucData <<= 1;
IIC_Delay(2);
IIC_SCL_HIGH();
IIC_Delay(2);
}
IIC_SCL_LOW();
}
uint8_t IIC_ReadByte(uint8_t ucAck)
{
uint8_t i = 8;
uint8_t ucData = 0;
IIC_SCL_LOW();
IIC_SDA_HIGH();
IIC_Delay(1);
while (i--)
{
IIC_SCL_HIGH();
IIC_Delay(1);
ucData <<= 1;
if (IIC_SDA_READ())
ucData++;
IIC_SCL_LOW();
IIC_Delay(1);
}
if (ucAck)
IIC_Ack();
else
IIC_NAck();
return ucData;
}
void IIC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitStruct.Pin = IIC_SCL_PIN | IIC_SDA_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(IIC_SCL_GPIO, &GPIO_InitStruct);
IIC_SDA_HIGH();
IIC_SCL_HIGH();
}
```
在上面的代码中,我们定义了PB7和PB9口分别对应IIC的SCL和SDA信号线。然后定义了几个宏,分别用于设置SCL和SDA口的电平状态。接着定义了一些IIC总线操作的函数,比如发送开始信号、停止信号、ACK信号、NAck信号、等待ACK信号、发送数据字节以及读取数据字节等。
最后,在IIC_Init函数中,我们使用HAL库的GPIO_InitTypeDef结构体来初始化PB7和PB9口的状态,设置为开漏输出,并将SDA口的电平状态设置为高电平。
有了这份代码,我们就可以使用PB7和PB9口的IIC驱动SS1623了。
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