unsigned char MMA845x_readch(unsigned char address)
{
unsigned char ret = 100;
IIC_start(); //启动
send_ch(MMA845x_IIC_ADDRESS); //写入设备ID及写信号
send_ch(address); //X地址
IIC_start(); //重新发送开始
send_ch(MMA845x_IIC_ADDRESS+1); //写入设备ID及读信
ret = read_ch(); //读取一字节
IIC_stop();
return ret;
}
//***************************************************
//从无子地址器件读单字节数据
//function:器件地址，所读数据存在接收缓冲区当前字节
void read_from_ch(unsigned char ad_main,unsigned char *buf){
IIC_start();
send_ch(ad_main); //发送器件地址
*buf=read_ch();
IIC_ack_main(no_ack); //无需应答<no_ack=0>
IIC_stop();
}
//写入
void MMA845x_writecha(unsigned char address, unsigned char thedata)
{
IIC_start(); //启动
send_ch(MMA845x_IIC_ADDRESS); //写入设备ID及写信号
send_ch(address); //X地址
send_ch(thedata); //写入设备ID及读信
IIC_stop();
}
uint8
iic2402_read(uint8 address)
{
uint8 tmp;
IIC_start();
IIC_write_byte(0xa0);
IIC_tack();
IIC_write_byte(address);
IIC_tack();
IIC_start();
IIC_write_byte(0xa1);
IIC_tack();
tmp = IIC_read_byte();
SCL_LOW;
IIC_notack();
IIC_stop();
return tmp;
}
//***************************************************
//向有子地址器件发送多字节数据
void send_to_nch(unsigned char ad_main,unsigned char ad_sub,unsigned char *buf,unsigned char num){
unsigned char i;
IIC_start();
send_ch(ad_main); //发送器件地址
send_ch(ad_sub); //发送器件子地址
for(i=0;i<num;i++){
send_ch(*buf); //发送数据*buf
buf++;
}
IIC_stop();
}
void
iic2402_write(uint8 address, uint8 byte)
{
IIC_start();
IIC_write_byte(0xa0);
IIC_tack();
IIC_write_byte(address);
IIC_tack();
IIC_write_byte(byte);
IIC_tack();
IIC_stop();
delay();
}
//***************************************************
//从有子地址器件读多个字节数据
//function:
void read_from_nch(unsigned char ad_main,unsigned char ad_sub,unsigned char *buf,unsigned char num){
unsigned char i;
IIC_start();
send_ch(ad_main);
send_ch(ad_sub);
for(i=0;i<num-1;i++){
*buf=read_ch();
IIC_ack_main(ack); //主应答<ack=1>
buf++;
}
*buf=read_ch();
buf++; //本次指针调整无意义，目的是操作后buf指向下一地址
IIC_ack_main(no_ack); //无需应答<no_ack=0>
IIC_stop();
}
/*****************************************************************************************
* Write_IIC_Bytes
* Function : Write data from dev at addr
* Action :
* Input : addr--the address which start to Write, buffer--the pointer to buffer used to store data
len-- the length of data needed to read
* Output : None
* Return : 1--success 0--fail
*****************************************************************************************/
uint8 Write_IIC_Bytes(const void *buffer, uint8 dev, uint16 addr, uint16 lenth)//(uint16 addr, const void *buffer, uint16 lenth, uint8 dev)
{
uint8 * p;
uint16 cTemp0,cTemp1;
uint8 flag;
for(cTemp1 = EE_TryTimes; cTemp1 != 0; cTemp1--)
{
if(cTemp1)
{
if (detect_sda() == FALSE)
{
continue;
}
}
IIC_start();
if(!EEPROM_AddrSend(dev, addr))
{
continue;
}
p = (uint8 *)buffer;
for(cTemp0 = lenth; cTemp0 > 0; cTemp0--)
{
flag = IIC_send400k(*p);
if(!flag)
{
break;
}
p++;
}
if(cTemp0 != 0)
{
continue;
}
IIC_stop();
return TRUE;
}
IIC_stop();
return FALSE;
}
/*****************************************************************************************
* read_IIC_bytes
* Function : Read data from dev at addr
* Action :
* Input : addr--the address which start to read, buffer--the pointer
to buffer used to store data
len-- the length of data needed to read, dev-- read from which
device
* Output : None
* Return : 1--success 0--fail
*****************************************************************************************/
uint8 read_IIC_bytes(void *buffer, uint8 dev, uint16 addr, uint16 lenth)//(uint16 addr, void *buffer, uint16 lenth, uint8 dev)
{
uint8 *p ;
uint16 cTemp1,cTemp0;
for(cTemp1 = EE_TryTimes; cTemp1 != 0; cTemp1--)
{
if(cTemp1)
{
if (detect_sda() == FALSE)
{
continue;
}
}
IIC_start();
if(!EEPROM_AddrSend(dev,addr))
{
continue;
}
p = (uint8 *)buffer;
IIC_start();
#if EEPROMTYPE <= 16
if(!IIC_send400k(dev | 0x01 | ((unsigned char)(addr / 0x100) << 1)))
{
continue;
}
#elif EEPROMTYPE <= 512
if(!IIC_send400k(dev | 0x01))
{
continue;
}
#else
if(!IIC_send400k(dev | 0x01 | ((unsigned char)(addr >> 16) << 1)))
{
continue;
}
#endif
for(cTemp0 = lenth-1; cTemp0 != 0; cTemp0--)
{
*p = IIC_receive400k();
p++;
SET_IIC_SDA_OUTPUT(); // ack
CLR_IIC_SDA();
SET_IIC_SCL();
Dly1us();
CLR_IIC_SCL();
SET_IIC_SDA();
}
*p = IIC_receive400k();
SET_IIC_SDA_OUTPUT();
SET_IIC_SDA();
SET_IIC_SCL();//收完最后一个字节发送NO ACK信号
Dly1us();
CLR_IIC_SCL();
IIC_stop();
return TRUE;
}
IIC_stop();
return FALSE;
}
//***************************************************
//向无子地址器件发送单字节数据
void send_to_ch(unsigned char ad_main,unsigned char c){
IIC_start();
send_ch(ad_main); //发送器件地址
send_ch(c); //发送数据c
IIC_stop();
}
