说明
该模块音频传输使用5G通信频率，内部集成双向数据透传功能及低音量静音功能，I2C端口均采用GPIO模拟的方式
STM8代码
GPIO初始化
GPIO_Init(I2C_SCL_PORT, (GPIO_Pin_TypeDef)I2C_SCL_PINS, GPIO_MODE_OUT_OD_LOW_FAST); GPIO_Init(I2C_SDA_PORT, (GPIO_Pin_TypeDef)I2C_SDA_PINS, GPIO_MODE_OUT_OD_LOW_FAST);
宏定义
#define I2C_SCL_PORT (GPIOB)#define I2C_SCL_PINS (GPIO_PIN_4)#define I2C_SDA_PORT (GPIOB)#define I2C_SDA_PINS (GPIO_PIN_5)#define SDA2_IN() {GPIOB->DDR&=~(1<<(5));(GPIOB->DDR|=(0<<(5)));}#define SDA2_OUT() {GPIOB->DDR&=~(1<<(5));(GPIOB->DDR|=(1<<(5)));}#define SCL2_IN() {GPIOB->DDR&=~(1<<(4));(GPIOB->DDR|=(0<<(4)));}#define SCL2_OUT() {GPIOB->DDR&=~(1<<(4));(GPIOB->DDR|=(1<<(4)));}#define READ_SDA2 GPIO_ReadInputPin(I2C_SDA_PORT,I2C_SDA_PINS)#define READ_SCL2 GPIO_ReadInputPin(I2C_SCL_PORT,I2C_SCL_PINS)#define __delay_us(x) delay_us(x*10)#define i2c_Start() i2c_Restart()#define ev01s 0x68 #define I2C_TM_SCL_HIGH 1#define I2C_TM_SCL_LOW 3#define I2C_TM_START_HD 24#define I2C_TM_DATA_SU 5#define I2C_TM_SCL_TO_DATA 5 /* SCL low to data valid */#define I2C_TM_STOP_SU 40#define I2C_TM_SCL_TMO 10 /* clock time out */#define de_ack 0#define de_non_ack 1#define I2C_ERROR (-1)I2C基础代码
/*
* Send (re)start condition
* - ensure data is high then issue a start condition
* - see also i2c_Start() macro
*/voidi2c_Restart(void){
SCL_HIGH(); /* ensure clock is low */
SDA_HIGH(); /* ensure data is high */
__delay_us(10);
SCL_LOW(); /* ensure clock is low */
SDA_HIGH(); /* ensure data is high */
__delay_us(I2C_TM_DATA_SU);
SCL_HIGH(); /* clock pulse high */
__delay_us(I2C_TM_SCL_HIGH);
SDA_LOW(); /* the high->low transition */
__delay_us(I2C_TM_START_HD); return;
}/*
* Send stop condition
* - data low-high while clock high
*/voidi2c_Stop(void){
SCL_LOW();
SDA_LOW(); /* ensure data is low first */
__delay_us(I2C_TM_DATA_SU);
SCL_HIGH(); /* float clock high */
__delay_us(I2C_TM_STOP_SU);
SDA_HIGH(); /* the low->high data transistion */
return;
}/*
* Check for an acknowledge
* - returns ack or ~ack, or ERROR if a bus error
*/signed chari2c_ReadAcknowledge(void){ unsigned char ack;
SCL_LOW(); /* make clock is low */
__delay_us(I2C_TM_SCL_TO_DATA); /* SCL low to data out valid */
SDA_HIGH(); if(fg_i2c_ev01s)
{
__delay_us(50);//50
} else
{
__delay_us(5);
}
SCL_HIGH();
__delay_us(I2C_TM_DATA_SU);
SDA2_IN(); //SDA设置为输入
ack = READ_SDA2; /* read the acknowledge */
SDA2_OUT(); return ack;
}/*
* Send a byte to the slave
* - returns true on error
*/unsigned chari2c_SendByte(unsigned char byte){ signed char i; for(i=7; i>=0; i--)
{
SCL_LOW(); /* drive clock low */
if ((byte>>i)&0x01)
{ /* bit to send */
SDA_HIGH();
} else
{
SDA_LOW();
}
__delay_us(3);
SCL_HIGH();
__delay_us(I2C_TM_SCL_HIGH); /* clock high time */
}
return FALSE;
}/*
* wait for the clock line to be released by slow slaves
* - returns TRUE if SCL was not released after the
* time out period.
* - returns FALSE if and when SCL released
*/unsigned chari2c_WaitForSCL(void){
SCL2_IN(); /* SCL_DIR should be input here */
if(!READ_SCL2)
{
__delay_us(I2C_TM_SCL_TMO); /* if the clock is still low -> bus error */
if(!READ_SCL2){
SCL2_OUT(); return TRUE;
}
}
SCL2_OUT(); return FALSE;
}/*
* Read a byte from the slave
* - returns the byte, or I2C_ERROR if a bus error
*/inti2c_ReadByte(void){ unsigned char i; unsigned char byte = 0; unsigned char x;
SCL_LOW(); if(fg_i2c_ev01s)
{
__delay_us(50);//50
} for(i=0; i<8; i++)
{
SCL_LOW(); /* drive clock low */
__delay_us(1); /* min clock low period */
SDA_HIGH(); /* release data line */
__delay_us(1);
SCL_HIGH(); /* float clock high */
__delay_us(1); /* min clock low period */
if(i2c_WaitForSCL()) return I2C_ERROR;
__delay_us(1);
byte = byte << 1; /* read the next bit */
SDA2_IN(); //x=READ_SDA2&0x01;
if(READ_SDA2)
{
x=0x01;
} else
{
x=0x00;
}
SDA2_OUT();
byte |=x;
} return (int)byte;
}/*
* send an address and data direction to the slave
* - 7-bit address (lsb ignored)
* - direction (FALSE = write )
*/unsigned chari2c_SendAddress(unsigned char address, unsigned char rw){ return i2c_SendByte(address | (rw?1:0));
}/*
* Opens communication with a device at address. mode
* indicates I2C_READ or I2C_WRITE.
* - returns TRUE if address is not acknowledged
*/unsigned chari2c_Open(unsigned char address, unsigned char mode){
i2c_Start();
i2c_SendAddress(address, mode); if(i2c_ReadAcknowledge())
return TRUE; return FALSE;
}/*
* Send an (~)acknowledge to the slave
* - status of I2C_LAST implies this is the last byte to be sent
*/voidi2c_SendAcknowledge(unsigned char status){
SCL_LOW(); if ( status & 0x01) {
SDA_LOW(); /* drive line low -> more to come */
}else {
SDA_HIGH();
}
__delay_us(I2C_TM_DATA_SU);
SCL_HIGH(); /* float clock high */
__delay_us(3); return;
}/*
* Get a byte from the slave and acknowledges the transfer
* - returns true on I2C_ERROR or byte
*/inti2c_GetByte(unsigned char more){ int byte; if((byte = i2c_ReadByte()) == I2C_ERROR) return I2C_ERROR;
i2c_SendAcknowledge(more); return byte;
}/*
* Send a byte to the slave and acknowledges the transfer
* - returns I2C_ERROR, ack or ~ack
*/signed chari2c_PutByte(unsigned char data){// if(i2c_SendByte(data))// return I2C_ERROR;
i2c_SendByte(data); return i2c_ReadAcknowledge(); /* returns ack, ~ack */}void i2c_send_dada(unsigned char A,unsigned char B,unsigned char C){
disableInterrupts(); unsigned char f=5; if(fg_i2c_ev01s)
{
f=50;
}
__delay_us(f);
i2c_Open(A,0);
i2c_PutByte(B);
i2c_PutByte(C);
i2c_Stop();
enableInterrupts();
}//************************************************//* I2C check data *//************************************************void i2c_read_dada(unsigned char a,unsigned char b,unsigned char c){ unsigned char z=0; unsigned char y; unsigned char t;
t=5;
disableInterrupts(); if(fg_i2c_ev01s)
{
t=50;
}
__delay_us(t);
i2c_Open(a,0);
i2c_PutByte(b); if(a==ev01s)
{
i2c_Stop();
}
__delay_us(t);
i2c_Open(a,1); for(;z<c;z++)
{
y=de_non_ack; if((z+1)==c)
{
y=de_ack;
}
ev01s_rcv_buf[z]=i2c_GetByte(y);
}
i2c_Stop();
enableInterrupts();
}注意：模块对i2C时序有一定要求，具体可参考数据手册
STM32代码
GPIO初始化
void IIC2_Init(void){
GPIO_InitPara GPIO_InitStructure;
RCC_AHBPeriphClock_Enable(RCC_AHBPERIPH_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_8 | GPIO_PIN_9;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_OUT; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
GPIO_InitStructure.GPIO_OType = GPIO_OTYPE_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB, GPIO_PIN_8 | GPIO_PIN_9);
}/*模块接收中断，外部中断线初始化*/void ev01s_it_Init(void){
EXTI_InitPara EXTI_InitStructure;
GPIO_InitPara GPIO_InitStructure;
NVIC_InitPara NVIC_InitStructure;
RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_CFG, ENABLE);//使能外部中断时钟
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_0;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_IN; //推挽输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PUPD_PULLUP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
SYSCFG_EXTILine_Config(EXTI_SOURCE_GPIOB, EXTI_SOURCE_PIN0);
EXTI_InitStructure.EXTI_LINE = EXTI_LINE0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //配置中断模式
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LINEEnable = ENABLE; //使能中断
EXTI_Init(&EXTI_InitStructure);
NVIC_PRIGroup_Enable(NVIC_PRIGROUP_3);
NVIC_InitStructure.NVIC_IRQ = EXTI0_1_IRQn;
NVIC_InitStructure.NVIC_IRQPreemptPriority = 2;//优先级
NVIC_InitStructure.NVIC_IRQSubPriority = 1;
NVIC_InitStructure.NVIC_IRQEnable = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}宏定义
//IO方向设置#define SDA2_IN() {GPIOB->CTLR&=~(3<<(9*2));GPIOB->CTLR|=0<<9*2;} #define SDA2_OUT() {GPIOB->CTLR&=~(3<<(9*2));GPIOB->CTLR|=1<<9*2;}#define SCL2_IN() {GPIOB->CTLR&=~(3<<(8*2));GPIOB->CTLR|=0<<8*2;} #define SCL2_OUT() {GPIOB->CTLR&=~(3<<(8*2));GPIOB->CTLR|=1<<8*2;}//IO操作函数#define IIC2_SCL(x) (x==0)?GPIO_ResetBits(GPIOB, GPIO_PIN_8):GPIO_SetBits(GPIOB, GPIO_PIN_8)// PBout(8) //SCL#define IIC2_SDA(x) (x==0)?GPIO_ResetBits(GPIOB, GPIO_PIN_9):GPIO_SetBits(GPIOB, GPIO_PIN_9)// PBout(9) //SDA #define READ_SDA2 GPIO_ReadInputBit(GPIOB,GPIO_PIN_9)//PBin(9) //输入SDA#define READ_SCL2 GPIO_ReadInputBit(GPIOB,GPIO_PIN_8)//PBin(8) //输入SCL#define SCL_LOW() IIC2_SCL(0)#define SCL_HIGH() IIC2_SCL(1)#define SDA_HIGH() IIC2_SDA(1)#define SDA_LOW() IIC2_SDA(0)#define ev01s 0x68 #define I2C_TM_SCL_HIGH 1#define I2C_TM_SCL_LOW 3#define I2C_TM_START_HD 24#define I2C_TM_DATA_SU 5#define I2C_TM_SCL_TO_DATA 5 /* SCL low to data valid */#define I2C_TM_STOP_SU 40#define I2C_TM_SCL_TMO 10 /* clock time out */#define de_ack 0#define de_non_ack 1#define I2C_ERROR (-1)#define __delay_us(x) delay_us(x*10)#define i2c_Start() i2c_Restart()
作者：WangDaS
链接：https://www.jianshu.com/p/1dee046878ad
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