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minidso
2016-04-30 20:56:50 +05:00
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S100App/Src/I2C.c Normal file
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/********************* (C) COPYRIGHT 2015 e-Design Co.,Ltd. **********************
File Name : I2C.c
Version : S100 APP Ver 2.11
Description:
Author : Celery
Data: 2015/07/20
History:
2015/07/07 ͳһ<CDB3><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
2015/07/21 I2C_DELAYTIME = 2;
*******************************************************************************/
#include "stm32f10x.h"
#include "I2C.h"
#include "Bios.h"
#include "oled.h"
#include "S100V0_1.h"
// --------- <20><><EFBFBD><EFBFBD>I2C<32>ӿ<EFBFBD><D3BF><EFBFBD><EFBFBD>ض<EFBFBD><D8B6><EFBFBD>-------- //
#define SDA GPIO_Pin_7
#define SCL GPIO_Pin_6
#define HIGH 1
#define LOW 0
#define SDA_VAL GPIO_ReadInputDataBit(GPIOB, SDA)
#define SCL_VAL GPIO_ReadInputDataBit(GPIOB, SCL)
#define I2C_MORE 1
#define I2C_LAST 0
#define I2C_TIMEOUT 255
#define FAILURE 0
#define SUCCEED 1
#define I2C_DELAYTIME 2
static void Sim_I2C_Set(u8 pin, u8 status);
static void Sim_I2C_Stop(void);
static void Sim_I2C_Start(void);
static u8 Sim_I2C_RD_Byte(u8 more);
static u8 Sim_I2C_WR_Byte(u8 data);
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: Delay_uS
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:us
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:NULL
*******************************************************************************/
void Delay_uS(u32 us)
{
while(us) us--;
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: I2C_Configuration
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <20><><EFBFBD><EFBFBD>I2C
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:NULL
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:NULL
*******************************************************************************/
void I2C_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
GPIO_Init_OLED();
/* PB6,7 SCL and SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* I2C1 configuration ------------------------------------------------------*/
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = DEVICEADDR_OLED;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 100000;//100k
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: I2C_Configuration
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <20><><EFBFBD><EFBFBD>I2C
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:NULL
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:NULL
*******************************************************************************/
void Sim_I2C_Set(u8 pin, u8 status)
{
if(status == HIGH) GPIO_SetBits (GPIOB, pin);
if(status == LOW) GPIO_ResetBits(GPIOB, pin);
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: Sim_I2C_Start
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <20><>ʼ
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:NULL
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:NULL
*******************************************************************************/
void Sim_I2C_Start(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // I2C_PIN_EN();
GPIO_InitStructure.GPIO_Pin = SCL | SDA;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init (GPIOB, &GPIO_InitStructure);
Sim_I2C_Set(SCL, LOW); // SCL low
Sim_I2C_Set(SDA, HIGH); // SDA float, set as output high
Sim_I2C_Set(SCL, HIGH); // SCL high
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SDA, LOW); // SDA high->low while sclk high, S state occur...
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, LOW); // SCL low
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: Sim_I2C_Stop
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: ֹͣ
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:NULL
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:NULL
*******************************************************************************/
void Sim_I2C_Stop(void)
{
Sim_I2C_Set(SCL, LOW); // SCL low
Sim_I2C_Set(SDA, LOW); // SDA low
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, HIGH); // SCL high
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SDA, HIGH); // SDA low->high while sclk high, P state occur
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, LOW); // SCL low
Delay_uS(I2C_DELAYTIME);
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: Sim_I2C_WR_Byte
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:<3A><>I2Cд<43><D0B4>λ<EFBFBD><CEBB><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:dataҪд<D2AA><D0B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:NULL
*******************************************************************************/
u8 Sim_I2C_WR_Byte(u8 data)
{
u8 i = 8;
while(i--) { //send out a bit by sda line.
Sim_I2C_Set(SCL, LOW); // sclk low
if(data & 0x80) Sim_I2C_Set(SDA, HIGH); // send bit is 1
else Sim_I2C_Set(SDA, LOW); // send bit is 0
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, HIGH); // SCL high
Delay_uS(I2C_DELAYTIME);
data <<=1; // left shift 1 bit, MSB send first.
}
Sim_I2C_Set(SCL, LOW); // SCL low
Sim_I2C_Set(SDA, HIGH); // SDA set as input
for(i=I2C_TIMEOUT; i!=0; i--) { // wait for sda low to receive ack
Delay_uS(I2C_DELAYTIME);
if (!SDA_VAL) {
Sim_I2C_Set(SCL, HIGH); // SCL high
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, LOW); // SCL_LOW();
Delay_uS(I2C_DELAYTIME);
return SUCCEED;
}
}
return FAILURE;
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: Sim_I2C_RD_Byte
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:<3A><>I2C<32><43><EFBFBD><EFBFBD>λ<EFBFBD><CEBB><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:more
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:<3A><><EFBFBD><EFBFBD><EFBFBD>İ<EFBFBD>λ<EFBFBD><CEBB><EFBFBD><EFBFBD>
*******************************************************************************/
u8 Sim_I2C_RD_Byte(u8 more)
{
u8 i = 8, byte = 0;
Sim_I2C_Set(SDA, HIGH); // SDA set as input
while(i--) {
Sim_I2C_Set(SCL, LOW); // SCL low
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, HIGH); // SCL high
Delay_uS(I2C_DELAYTIME);
byte <<=1; //recv a bit
if (SDA_VAL) byte |= 0x01;
}
Sim_I2C_Set(SCL, LOW);
if(!more) Sim_I2C_Set(SDA, HIGH); //last byte, send nack.
else Sim_I2C_Set(SDA, LOW); //send ack
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, HIGH); // SCL_HIGH();
Delay_uS(I2C_DELAYTIME);
Sim_I2C_Set(SCL, LOW);
return byte;
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: I2C_PageWrite
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:<3A><> <20><>ַ deviceaddr д<><D0B4>numbyte<74><65><EFBFBD>ֽڵ<D6BD><DAB5><EFBFBD><EFBFBD>ݣ<EFBFBD>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>pbuf
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:pbuf д<><D0B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD>numbyte Ϊд<CEAA><D0B4><EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD><D6BD><EFBFBD><EFBFBD><EFBFBD>deviceaddrΪд<CEAA><D0B4><EFBFBD>ĵ<EFBFBD>ַ
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:NULL
*******************************************************************************/
void I2C_PageWrite(u8* pbuf, u8 numbyte,u8 deviceaddr )
{
Sim_I2C_Start();
Sim_I2C_WR_Byte(deviceaddr<<1);
while(numbyte--) Sim_I2C_WR_Byte(*pbuf++);
Sim_I2C_Stop();
}
/*******************************************************************************
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: I2C_PageRead
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:<3A><>I2C<32><43><EFBFBD><EFBFBD>λ<EFBFBD><CEBB><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: pbuf <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><C4B4>ŵ<EFBFBD>ַ numbyteΪ<65><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD><D6BD><EFBFBD>
deviceaddr<64>豸<EFBFBD><E8B1B8>ַ readaddr<64><72>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD>ݵ<EFBFBD>ַ
<EFBFBD><EFBFBD><EFBFBD>ز<EFBFBD><EFBFBD><EFBFBD>:<3A><><EFBFBD><EFBFBD><EFBFBD>İ<EFBFBD>λ<EFBFBD><CEBB><EFBFBD><EFBFBD>
*******************************************************************************/
void I2C_PageRead(u8* pbuf, u8 numbyte,u8 deviceaddr, u8 readaddr)
{
Sim_I2C_Start();
Sim_I2C_WR_Byte(deviceaddr<<1);
Sim_I2C_WR_Byte(readaddr);
Sim_I2C_Start();
Sim_I2C_WR_Byte((deviceaddr<<1)|1);
while(numbyte--) {
if(numbyte) *pbuf++ = Sim_I2C_RD_Byte(I2C_MORE);
else *pbuf++ = Sim_I2C_RD_Byte(I2C_LAST);
}
Sim_I2C_Stop();
}
/******************************** END OF FILE *********************************/