230 lines
7.9 KiB
C
230 lines
7.9 KiB
C
/********************* (C) COPYRIGHT 2015 e-Design Co.,Ltd. **********************
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File Name : I2C.c
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Version : S100 APP Ver 2.11
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Description:
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Author : Celery
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Data: 2015/07/20
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History:
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2015/07/07 统一命名；
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2015/07/21 I2C_DELAYTIME = 2;
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*******************************************************************************/
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#include "stm32f10x.h"
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#include "I2C.h"
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#include "Bios.h"
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#include "oled.h"
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#include "S100V0_1.h"
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// --------- 仿真I2C接口相关定义-------- //
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#define SDA GPIO_Pin_7
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#define SCL GPIO_Pin_6
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#define HIGH 1
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#define LOW 0
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#define SDA_VAL GPIO_ReadInputDataBit(GPIOB, SDA)
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#define SCL_VAL GPIO_ReadInputDataBit(GPIOB, SCL)
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#define I2C_MORE 1
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#define I2C_LAST 0
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#define I2C_TIMEOUT 255
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#define FAILURE 0
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#define SUCCEED 1
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#define I2C_DELAYTIME 2
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static void Sim_I2C_Set(u8 pin, u8 status);
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static void Sim_I2C_Stop(void);
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static void Sim_I2C_Start(void);
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static u8 Sim_I2C_RD_Byte(u8 more);
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static u8 Sim_I2C_WR_Byte(u8 data);
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/*******************************************************************************
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函数名: Delay_uS
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函数作用: 软件延时
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输入参数:us
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返回参数:NULL
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*******************************************************************************/
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void Delay_uS(u32 us)
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{
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while(us) us--;
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}
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/*******************************************************************************
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函数名: I2C_Configuration
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函数作用: 配置I2C
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输入参数:NULL
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返回参数:NULL
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*******************************************************************************/
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void I2C_Configuration(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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I2C_InitTypeDef I2C_InitStructure;
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GPIO_Init_OLED();
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/* PB6,7 SCL and SDA */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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/* I2C1 configuration ------------------------------------------------------*/
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I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
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I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
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I2C_InitStructure.I2C_OwnAddress1 = DEVICEADDR_OLED;
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I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
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I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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I2C_InitStructure.I2C_ClockSpeed = 100000;//100k
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I2C_Init(I2C1, &I2C_InitStructure);
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I2C_Cmd(I2C1, ENABLE);
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}
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/*******************************************************************************
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函数名: I2C_Configuration
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函数作用: 配置I2C
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输入参数:NULL
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返回参数:NULL
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*******************************************************************************/
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void Sim_I2C_Set(u8 pin, u8 status)
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{
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if(status == HIGH) GPIO_SetBits (GPIOB, pin);
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if(status == LOW) GPIO_ResetBits(GPIOB, pin);
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}
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/*******************************************************************************
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函数名: Sim_I2C_Start
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函数作用: 开始
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输入参数:NULL
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返回参数:NULL
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*******************************************************************************/
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void Sim_I2C_Start(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // I2C_PIN_EN();
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GPIO_InitStructure.GPIO_Pin = SCL | SDA;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init (GPIOB, &GPIO_InitStructure);
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Sim_I2C_Set(SCL, LOW); // SCL low
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Sim_I2C_Set(SDA, HIGH); // SDA float, set as output high
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Sim_I2C_Set(SCL, HIGH); // SCL high
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SDA, LOW); // SDA high->low while sclk high, S state occur...
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, LOW); // SCL low
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}
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/*******************************************************************************
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函数名: Sim_I2C_Stop
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函数作用: 停止
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输入参数:NULL
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返回参数:NULL
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*******************************************************************************/
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void Sim_I2C_Stop(void)
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{
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Sim_I2C_Set(SCL, LOW); // SCL low
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Sim_I2C_Set(SDA, LOW); // SDA low
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, HIGH); // SCL high
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SDA, HIGH); // SDA low->high while sclk high, P state occur
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, LOW); // SCL low
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Delay_uS(I2C_DELAYTIME);
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}
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/*******************************************************************************
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函数名: Sim_I2C_WR_Byte
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函数作用:向I2C写八位数据
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输入参数:data要写入的数据
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返回参数:NULL
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*******************************************************************************/
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u8 Sim_I2C_WR_Byte(u8 data)
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{
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u8 i = 8;
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while(i--) { //send out a bit by sda line.
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Sim_I2C_Set(SCL, LOW); // sclk low
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if(data & 0x80) Sim_I2C_Set(SDA, HIGH); // send bit is 1
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else Sim_I2C_Set(SDA, LOW); // send bit is 0
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, HIGH); // SCL high
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Delay_uS(I2C_DELAYTIME);
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data <<=1; // left shift 1 bit, MSB send first.
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}
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Sim_I2C_Set(SCL, LOW); // SCL low
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Sim_I2C_Set(SDA, HIGH); // SDA set as input
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for(i=I2C_TIMEOUT; i!=0; i--) { // wait for sda low to receive ack
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Delay_uS(I2C_DELAYTIME);
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if (!SDA_VAL) {
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Sim_I2C_Set(SCL, HIGH); // SCL high
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, LOW); // SCL_LOW();
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Delay_uS(I2C_DELAYTIME);
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return SUCCEED;
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}
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}
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return FAILURE;
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}
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/*******************************************************************************
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函数名: Sim_I2C_RD_Byte
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函数作用:向I2C读八位数据
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输入参数:more
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返回参数:读出的八位数据
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*******************************************************************************/
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u8 Sim_I2C_RD_Byte(u8 more)
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{
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u8 i = 8, byte = 0;
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Sim_I2C_Set(SDA, HIGH); // SDA set as input
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while(i--) {
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Sim_I2C_Set(SCL, LOW); // SCL low
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, HIGH); // SCL high
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Delay_uS(I2C_DELAYTIME);
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byte <<=1; //recv a bit
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if (SDA_VAL) byte |= 0x01;
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}
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Sim_I2C_Set(SCL, LOW);
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if(!more) Sim_I2C_Set(SDA, HIGH); //last byte, send nack.
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else Sim_I2C_Set(SDA, LOW); //send ack
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, HIGH); // SCL_HIGH();
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Delay_uS(I2C_DELAYTIME);
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Sim_I2C_Set(SCL, LOW);
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return byte;
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}
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/*******************************************************************************
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函数名: I2C_PageWrite
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函数作用:向 地址 deviceaddr 写入numbyte个字节的数据，写入的内容在pbuf
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输入参数:pbuf 写入的内容，numbyte 为写入的字节数，deviceaddr为写入的地址
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返回参数:NULL
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*******************************************************************************/
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void I2C_PageWrite(u8* pbuf, u8 numbyte,u8 deviceaddr )
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{
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Sim_I2C_Start();
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Sim_I2C_WR_Byte(deviceaddr<<1);
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while(numbyte--) Sim_I2C_WR_Byte(*pbuf++);
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Sim_I2C_Stop();
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}
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/*******************************************************************************
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函数名: I2C_PageRead
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函数作用:向I2C读八位数据
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输入参数: pbuf 读出来的存放地址 numbyte为读出来的字节数
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deviceaddr设备地址 readaddr读取的内容地址
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返回参数:读出的八位数据
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*******************************************************************************/
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void I2C_PageRead(u8* pbuf, u8 numbyte,u8 deviceaddr, u8 readaddr)
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{
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Sim_I2C_Start();
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Sim_I2C_WR_Byte(deviceaddr<<1);
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Sim_I2C_WR_Byte(readaddr);
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Sim_I2C_Start();
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Sim_I2C_WR_Byte((deviceaddr<<1)|1);
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while(numbyte--) {
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if(numbyte) *pbuf++ = Sim_I2C_RD_Byte(I2C_MORE);
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else *pbuf++ = Sim_I2C_RD_Byte(I2C_LAST);
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}
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Sim_I2C_Stop();
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}
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/******************************** END OF FILE *********************************/
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