void acknowledge_poll(void){
GPIO_InitTypeDef GPIO_InitStructure;
uint8_t i;
do{
//delay_100ns(100);
e2prom_start_condition();
delay_100ns(5);
e2prom_send_data(E2PROM_ADDR&0xFE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PB6--SCL PB7--SDA 释放SDA信号线
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
delay_100ns(5);
set_scl;
delay_100ns(8);
if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_7) == (uint8_t)Bit_RESET) i=0;
else continue;
delay_100ns(8);//(10);
reset_scl;
delay_100ns(13);
//if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_7) == (uint8_t)Bit_RESET) i=0;
//else i = 0xFF;
while(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_7) == (uint8_t)Bit_RESET);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}while(i);
}
void e2prom_stop_condition(void){ //结束前，scl sda均为低，结束条件产生后scl信号线为低，sda信号线为高
reset_scl_sda; delay_100ns(2);
set_scl;
delay_100ns(6); //tsu.sto min:0.6us in 1.8Vcc, min:0.25us in 5.0Vcc
set_sda;
delay_100ns(13); //tbuf min:1.3us in 1.8Vcc, min:0.5us in 5.0Vcc
reset_scl;
delay_100ns(6);
//delay_us(50);
}
//IIC模拟时序驱动
void e2prom_start_condition(void){ //通信起始时，scl信号线为低，sda信号线为高，起始条件产生后均为低
//起始条件
reset_scl; set_sda;
delay_100ns(2);
set_scl;
delay_100ns(6); //tsu.sta min:0.6us in 1.8Vcc, min:0.25us in 5.0Vcc
reset_sda;
delay_100ns(6); //thd.sta min:0.6us in 1.8Vcc, min:0.25us in 5.0Vcc
reset_scl;
delay_100ns(13); //tlow min:1.3us in 1.8Vcc, min:0.4us in 5.0Vcc
}
uint8_t e2prom_read_byte(uint16_t add){
GPIO_InitTypeDef GPIO_InitStructure;
uint8_t data;
uint8_t i;
data = 0;
//acknowledge_poll();
e2prom_check_busy();
e2prom_start_condition();
e2prom_send_data((E2PROM_ADDR&0xFE)); //写入器件地址
e2prom_waitfor_ack();
e2prom_send_data(0xFF&(add>>8));
e2prom_waitfor_ack();
e2prom_send_data(0xFF&add);
e2prom_waitfor_ack();
e2prom_start_condition();
e2prom_send_data((E2PROM_ADDR&0xFE)|0x01); //写入器件地址
e2prom_waitfor_ack();
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PB6--SCL PB7--SDA 释放SDA信号线
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
for(i=0; i<8; i++){
set_scl;
delay_100ns(5);
if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_7) == (uint8_t)Bit_SET) data = (data<<1) | 0x01;
else data = data<<1;
delay_100ns(5);
reset_scl;
delay_100ns(13);
}
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
e2prom_stop_condition();
//acknowledge_poll();
delay_us(50);
return data;
}
void e2prom_send_data(uint8_t dat){ //进入此函数时，scl确定为低
uint8_t i;
reset_scl;
for(i=0; i<8; i++){
//reset_scl;
if(dat&0x80) set_sda;
else reset_sda;
delay_100ns(9);
set_scl;
delay_100ns(6);
reset_scl;
delay_100ns(13);
dat <<= 1;
}
}
void e2prom_reset(void){ //数据传输完成后，scl为低，sda为低
uint8_t i;
e2prom_start_condition();
//scl sda = 0
set_sda;
delay_100ns(2); //tsu.dat min:100ns
for(i=0; i<9; i++){
set_scl;
delay_100ns(6); //thigh min:0.6us in 1.8Vcc, min:0.4us in 5.0Vcc
reset_scl;
delay_100ns(13);
}
e2prom_start_condition();
e2prom_stop_condition();
}
void e2prom_waitfor_ack(void){
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PB6--SCL PB7--SDA 释放SDA信号线
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
set_scl;
delay_100ns(2);
while(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_7) == (uint8_t)Bit_SET);
delay_100ns(10);
reset_scl;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
/***********************************************************************
#ifdef DOC
FUNCTION : LensDrvSPIWriteUint
DESCRIPTION : write Lens driver's registor
INPUT : addr,wt_data
OUTPUT : none
UPDATE :
DATE : 2011/02/21
#endif
***********************************************************************/
void LensDrvSPIWriteUint( uchar addr, uint wt_data )
{
uchar i,j=0;
SPI_CS_AN41908A_LOW;
delay_100ns();
SPI_SCK_AN41908A_HIGH;
SPI_CS_AN41908A_HIGH;
delay_100ns();
for ( i = 0; i <8; i++)
{
SPI_SCK_AN41908A_LOW;
delay_50ns();
if( i<= 5)
{
SPI_SIN_AN41908A_MODE((addr&(1<<i)) >> i );
}
else
{
void an41908_check_work_state(void)
{
SPI_CS_AN41908A_LOW;
delay_100ns();
if(SPI_SOUT_AN41908_PIN_GET)
{
an41908_work_state = 1;
}
delay_100ns();
SPI_CS_AN41908A_HIGH;
delay_100ns();
if(SPI_SOUT_AN41908_PIN_GET == 0)
{
an41908_work_state = 1;
}
else
an41908_work_state = 0;
}
