674 lines
12 KiB
C
674 lines
12 KiB
C
#include "bl24c512.h"
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#include "include.h"
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static u32 last_write_time;
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bool I2C_eeprom_write_byte( u16 addr, u8 data);
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bool I2C_eeprom_Read_byte(u16 addr, u8 *data);
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void eeprom_da_mode(bool in_mode)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Pin = SDA_PIN;
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GPIO_InitStructure.GPIO_Mode = (in_mode == TRUE) ? GPIO_Mode_IN_FLOATING : GPIO_Mode_Out_OD;
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GPIO_Init(SDA_PIN_PORT, &GPIO_InitStructure );
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Pin = SCL_PIN;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(SCL_PIN_PORT , &GPIO_InitStructure );
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}
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/*************************************************************
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函数功能：延时连个指令周期
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函数名称：delayedus
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函数返回：无返回值。
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函数参数：延时时间
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**************************************************************/
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void delayed_ms(u8 n)
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{
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u32 dy;
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u8 i;
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for(i=0;i<n;i++)
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{
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dy=3200;
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while(dy!=0)
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{dy--;}
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}
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}
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void delayedus(u8 n)
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{
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u8 i;
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for(i=0;i<n;i++);
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}
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/*************************************************************
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函数功能：I2C总线复位。
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函数名称：I2C_Reset。
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函数返回：无返回值。
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函数参数：无参数
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**************************************************************/
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void I2C_Reset(void)
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{
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eeprom_da_mode(SDA_MODE_IN);
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while(1)
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{
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SCL_LOW();
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delayedus(1);
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SCL_HIGH();
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if( GET_SDA() ==1 )
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{
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break;
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}
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delayedus(1);
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}
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eeprom_da_mode(SDA_MODE_OUT);
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}
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void bl24c512_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(SDA_PIN_CLK | SCL_PIN_CLK , ENABLE);
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GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Pin = SDA_PIN;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
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GPIO_Init(SDA_PIN_PORT , &GPIO_InitStructure );
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Pin = SCL_PIN;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(SCL_PIN_PORT , &GPIO_InitStructure );
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//I2C_Reset();
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}
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/*************************************************************
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函数功能：产生起始位。
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函数名称：I2C_GenerateSTART。
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函数返回：无返回值。
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函数参数：无参数
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**************************************************************/
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void BL24C512I2C_GenerateSTART(void)
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{
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SDA_HIGH();//eeprom_da(1);
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SCL_HIGH();//eeprom_clk(1);
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delayedus(2);
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SDA_LOW();//eeprom_da(0);
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delayedus(2);
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SCL_LOW();//eeprom_clk(0);
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delayedus(2);
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}
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/*************************************************************
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函数功能：产生停始位。
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函数名称：I2C_GenerateSTOP。
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函数返回：无返回值。
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函数参数：无参数
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**************************************************************/
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void BL24C512_I2C_GenerateSTOP(void)
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{
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SDA_LOW();//eeprom_da(0);
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delayedus(2);
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SCL_HIGH();//eeprom_clk(1);
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SDA_LOW();//eeprom_da(0);
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delayedus(2);
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SDA_HIGH();//eeprom_da(1);
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}
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void self_test_eeprom(void)
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{
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char testBuf[] = "test eeprom";
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char buf[15] = {0};
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I2C_eeprom_write_buf(32896, (u8*)testBuf, sizeof(testBuf));
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I2C_eeprom_read_buf( 32896, (u8*)buf, sizeof(testBuf));
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if (cmp_datas((u8*)buf, (u8*)testBuf, sizeof(testBuf)))
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{
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printf("OK\r\n");
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}
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else
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{
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printf("ERROR\r\n");
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}
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}
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/*************************************************************
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函数功能：检测应答。
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函数名称：I2C_check_ack。
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函数返回：返回值是应答状态。
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函数参数：无参数。
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**************************************************************/
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unsigned char I2C_check_ack(void)
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{
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unsigned char ack=0;
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eeprom_da_mode(SDA_MODE_IN);
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SCL_HIGH();//eeprom_clk(1);
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delayedus(1);
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if(GET_SDA() ==1)
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{
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ack=0;
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}
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else
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{
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ack=1;
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}
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SCL_LOW();//eeprom_clk(0);
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delayedus(1);
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eeprom_da_mode(SDA_MODE_OUT);
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return ack;
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}
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/*************************************************************
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函数功能：发送一个应答位。
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函数名称：I2c_send_ack。
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函数返回：无返回值。
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函数参数：无。
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**************************************************************/
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void I2c_send_ack(void)
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{
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SDA_LOW();//eeprom_da(0);
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delayedus(1);
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SCL_LOW();//eeprom_clk(0);
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delayedus(1);
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SCL_HIGH();//eeprom_clk(1);
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delayedus(1);
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SCL_LOW();//eeprom_clk(0);
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SDA_HIGH();//eeprom_da(1);
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}
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/*************************************************************
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函数功能：发送一个NO应答。
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函数名称：I2c_send_no_ack。
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函数返回：无返回值。
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函数参数：无。
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*************************************************************/
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void I2c_send_no_ack(void)
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{
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SDA_HIGH();//eeprom_da(1);
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delayedus(1);
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SCL_LOW();//eeprom_clk(0);
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delayedus(1);
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SCL_HIGH();//eeprom_clk(1);
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delayedus(1);
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SCL_LOW();//eeprom_clk(0);
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}
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/*************************************************************
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函数功能：I2C发送一个字节。
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函数名称：I2c_send_byte。
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函数返回：无返回值。
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函数参数：无。
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*************************************************************/
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void I2c_send_byte(unsigned char data )
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{
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unsigned char i;
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SCL_LOW(); //eeprom_clk(0);//clk 0
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for(i=0;i<8;i++)
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{
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if((data&0x80)==0x80)
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{
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SDA_HIGH();//eeprom_da(1);
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}
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else
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{
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SDA_LOW(); //eeprom_da(0);
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}
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SCL_HIGH(); //eeprom_clk(1);//clk 1
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delayedus(1);
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SCL_LOW(); //eeprom_clk(0);//clk 0
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delayedus(1);
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data<<=1;
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}
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delayedus(90);
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}
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/*************************************************************
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函数功能：I2C接收一个字节。
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函数名称：I2c_receive_byte。
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函数返回：无返回值。
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函数参数：无。
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**************************************************************/
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unsigned char I2c_receive_byte(void)
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{
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unsigned char i;
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unsigned char rda=0;
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eeprom_da_mode(SDA_MODE_IN);
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SCL_LOW(); //eeprom_clk(0);//clk 0
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delayedus(1);
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for(i=0;i<8;i++)
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{
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rda<<=1;
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SCL_HIGH(); //eeprom_clk(1);//clk 1
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delayedus(1);
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if(GET_SDA() ==1 )
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{
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rda|=0x01;
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}
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else
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{
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rda&=0xFE;
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}
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SCL_LOW(); //eeprom_clk(0);//clk 0
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delayedus(1);
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}
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eeprom_da_mode(SDA_MODE_OUT);
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return rda;
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}
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/*************************************************************
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函数功能：EEPROM检测EEPROM是否空闲，可以进行读写
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函数名称：poll_busy。
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函数返回：无返回值。
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函数参数：EEPROM的地址addr ，对应写入数据data。
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**************************************************************/
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bool poll_busy(void)
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{
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BL24C512I2C_GenerateSTART();
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I2c_send_byte(BL24C512ADDR);
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if(I2C_check_ack()== 1)
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{
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BL24C512_I2C_GenerateSTOP();
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return TRUE;
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}
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else
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{
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BL24C512_I2C_GenerateSTOP();
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return FALSE;
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}
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}
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void wait_eeprom_free(void)
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{
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while( last_write_time + 6/portTICK_RATE_MS > xTaskGetTickCount() );
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while (1)
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{
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if (poll_busy())
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{
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break;
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}
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}
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}
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/*************************************************************
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函数功能：EEPROM任意地址写一字节。
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函数名称：I2C_eeprom_write_byte。
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函数返回：无返回值。
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函数参数：EEPROM的地址addr ，对应写入数据data。
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**************************************************************/
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bool I2C_eeprom_write_byte( u16 addr, u8 data)
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{
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unsigned char addrlow;
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unsigned char addrhigh;
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addrlow=(unsigned char)addr;
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addrhigh=(unsigned char)(addr>>8);
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wait_eeprom_free();
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BL24C512I2C_GenerateSTART();
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I2c_send_byte(BL24C512ADDR);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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I2c_send_byte(addrhigh);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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I2c_send_byte(addrlow);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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I2c_send_byte(data);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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BL24C512_I2C_GenerateSTOP();
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last_write_time = xTaskGetTickCount();
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return TRUE;
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}
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/*************************************************************
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函数功能：EEPROM任意地址读一字节。
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函数名称：I2C_eeprom_Read_byte。
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函数返回：无返回值。
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函数参数：EEPROM的地址addr。
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**************************************************************/
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bool I2C_eeprom_Read_byte(u16 addr, u8 *data)
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{
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unsigned char devaddr=0;
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unsigned char addrlow=0;
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unsigned char addrhigh=0;
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addrlow=(unsigned char)addr;
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addrhigh=(unsigned char)(addr>>8);
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wait_eeprom_free();
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BL24C512I2C_GenerateSTART();
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I2c_send_byte(BL24C512ADDR);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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I2c_send_byte(addrhigh);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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I2c_send_byte(addrlow);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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devaddr=(BL24C512ADDR| 0X01);
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BL24C512I2C_GenerateSTART();
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I2c_send_byte(devaddr);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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*data=I2c_receive_byte();
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I2c_send_no_ack();
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delayedus(1);
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BL24C512_I2C_GenerateSTOP();
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return TRUE;
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}
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/*************************************************************
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函数功能：EEPROM写入数组，只能写入小于128byte数据，并且不能超过页范围
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函数名称：I2C_eeprom_write_buf
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函数返回：无返回值。
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函数参数：EEPROM的地址addr。
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**************************************************************/
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bool I2C_eeprom_write_page(u16 addr, u8 * buf, u8 length)
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{
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unsigned char addrlow;
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unsigned char addrhigh;
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addrlow=(unsigned char)addr;
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addrhigh=(unsigned char)(addr>>8);
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wait_eeprom_free();
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BL24C512I2C_GenerateSTART();
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I2c_send_byte(BL24C512ADDR);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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I2c_send_byte(addrhigh);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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I2c_send_byte(addrlow);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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for (u8 i = 0; i < length; i++)
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{
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I2c_send_byte(buf[i]);
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if(I2C_check_ack()==0)
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{
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return FALSE;
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}
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}
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BL24C512_I2C_GenerateSTOP();
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last_write_time = xTaskGetTickCount();
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return TRUE;
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}
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/*************************************************************
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函数功能：EEPROM写入数组，只能写入小于128byte数据，并且不能超过页范围
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函数名称：I2C_eeprom_write_buf
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函数返回：无返回值。
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函数参数：EEPROM的地址addr。
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**************************************************************/
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bool I2C_eeprom_write_buf(u16 startAddr, u8 * buf, u16 length)
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{
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bl24c512_init();
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u16 current_startAddr = startAddr;
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u8 first_page_byte = EEPROM_PAGE_SIZE - (startAddr % EEPROM_PAGE_SIZE);
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u8 * current_data_ptr = buf;
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u16 left_length = length;
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u16 integrated_Pages;
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u16 end_page_byte;
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if (length > first_page_byte)
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{
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if (!I2C_eeprom_write_page(current_startAddr, current_data_ptr, first_page_byte))
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{
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return FALSE;
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}
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current_startAddr = current_startAddr + first_page_byte;
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current_data_ptr += first_page_byte;
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left_length = length - first_page_byte;
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integrated_Pages = left_length / EEPROM_PAGE_SIZE;
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end_page_byte = left_length % EEPROM_PAGE_SIZE;
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for (u16 i = 0; i < integrated_Pages; i++)
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{
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if (!I2C_eeprom_write_page(current_startAddr, current_data_ptr, EEPROM_PAGE_SIZE))
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{
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return FALSE;
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}
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current_startAddr += EEPROM_PAGE_SIZE;
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current_data_ptr += EEPROM_PAGE_SIZE;
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}
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if (end_page_byte > 0)
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{
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if (!I2C_eeprom_write_page(current_startAddr, current_data_ptr, end_page_byte))
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{
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return FALSE;
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}
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}
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}
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else
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{
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if(!I2C_eeprom_write_page(startAddr, buf, length))
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{
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return FALSE;
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}
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}
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return TRUE;
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}
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/*************************************************************
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函数功能：EEPROM读出数组
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函数名称：I2C_eeprom_write_buf
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函数返回：无返回值。
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函数参数：EEPROM的地址addr。
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**************************************************************/
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bool I2C_eeprom_read_buf(u16 addr, u8 * buf, u16 length)
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{
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unsigned char devaddr;
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if (length == 0)
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{
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return FALSE;
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}
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wait_eeprom_free();
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bl24c512_init();
|
||
|
||
if (I2C_eeprom_Read_byte(addr, buf) == FALSE)
|
||
{
|
||
return FALSE;
|
||
}
|
||
|
||
length--;
|
||
|
||
if (length > 0)
|
||
{
|
||
devaddr=(BL24C512ADDR| 0X01);
|
||
|
||
BL24C512I2C_GenerateSTART();
|
||
|
||
I2c_send_byte(devaddr);
|
||
|
||
if(I2C_check_ack()==0)
|
||
{
|
||
return FALSE;
|
||
}
|
||
|
||
for (u16 i = 0; i < length; i++)
|
||
{
|
||
buf[i+ 1] = I2c_receive_byte();
|
||
|
||
if (i < length - 1)
|
||
{
|
||
I2c_send_ack();
|
||
}
|
||
}
|
||
|
||
I2c_send_no_ack();
|
||
BL24C512_I2C_GenerateSTOP();
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|