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https://github.com/RT-Thread/rt-thread.git
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Create a driver diectory
Add I2C driver and a 24LC024H i2c eeprom usage example Now only support I2C1, not yet fully support I2C2 ****GPIO Config**** I2C1 SDA -> PB8 I2C1 SCL -> PB9 git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1716 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
yungchi@cs.nctu.edu.tw
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#include <rtthread.h>
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#include "i2c.h"
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#define EE_Address 0xA0
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#define EE24LC024H
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/*
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Note: If eeprom size lager then 256 byte, you must define EE_ADDR_SIZE == I2C_MEM_2Bytes
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*/
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#ifdef EE24LC024H
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#define EE_PageSize 8
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#define EE_ADDR_SIZE I2C_MEM_1Byte
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#define EE_MEM_SIZE 256
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#define EE_PageSize 16
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#endif
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static struct rt_device ee_dev;
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uint32_t EE_ReadBuffer(uint8_t* pBuffer, uint16_t ReadAddr, uint16_t NumByteToRead)
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{
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return I2C_IORW(I2C1, pBuffer, NumByteToRead, ReadAddr, EE_Address | 0x01, I2C_MEM_1Byte );
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}
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uint32_t EE_WritePage(uint8_t* pBuffer, uint16_t WriteAddr)
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{
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I2C_IORW(I2C1, pBuffer, EE_PageSize , WriteAddr, EE_Address , EE_ADDR_SIZE );
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/*if( I2C_AcknowledgePolling(I2C1 , EE_Address) == Error )
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rt_kprintf("EE ACK failed\n");*/
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rt_thread_delay(50);
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}
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uint32_t EE_WriteByte(uint8_t* pBuffer, uint16_t WriteAddr)
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{
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I2C_IORW(I2C1, pBuffer, 1 , WriteAddr, EE_Address, EE_ADDR_SIZE );
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/*if( I2C_AcknowledgePolling(I2C1 , EE_Address) == Error )
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rt_kprintf("EE ACK failed\n");*/
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rt_thread_delay(50);
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}
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Status EE_WriteBuffer(uint8_t* pBuffer, uint16_t WriteAddr, uint16_t NumByteToWrite)
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{
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uint8_t NumOfPage = 0, NumOfSingle = 0;
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uint16_t Addr = 0,count = 0;
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uint8_t* ptr = pBuffer;
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Addr = WriteAddr;
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count = NumByteToWrite;
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if( (WriteAddr + NumByteToWrite ) > EE_MEM_SIZE )
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return Error;
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while( count >= EE_PageSize )
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{
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EE_WritePage(ptr, Addr);
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Addr += EE_PageSize;
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count -= EE_PageSize;
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ptr += EE_PageSize;
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}
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while( count )
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{
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EE_WriteByte( ptr++, Addr++ );
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count--;
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}
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return Success;
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}
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static rt_err_t ee24LCxx_init (rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_size_t ee24LCxx_read( rt_device_t dev, rt_off_t pos, void *buf, rt_size_t size )
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{
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if( EE_ReadBuffer(buf, pos, size) == Success )
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return size;
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else
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return -1;
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}
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static rt_size_t ee24LCxx_write( rt_device_t dev, rt_off_t pos, void *buf, rt_size_t size )
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{
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if( EE_WriteBuffer(buf, pos, size) == Success )
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return size;
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else
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return -1;
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}
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static rt_err_t ee24LCxx_open(rt_device_t dev, rt_uint16_t oflag)
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{
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return RT_EOK;
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}
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static rt_err_t ee24LCxx_close(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_err_t ee24LCxx_control (rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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return RT_EOK;
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}
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void ee24LCxx_hw_init()
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{
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I2C1_INIT();
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ee_dev.init = ee24LCxx_init;
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ee_dev.open = ee24LCxx_open;
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ee_dev.close = ee24LCxx_close;
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ee_dev.read = ee24LCxx_read;
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ee_dev.write = ee24LCxx_write;
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ee_dev.control = ee24LCxx_control;
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ee_dev.type = RT_Device_Class_I2C;
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rt_device_register(&ee_dev, "eeprom", RT_DEVICE_FLAG_RDWR);
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}
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void ee_test()
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{
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char buf[256], read[256];
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int i,ret;
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rt_device_t dev;
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dev = rt_device_find("eeprom");
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for(i = 0; i < 256; i++ )
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{
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buf[i] = i;
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read[i] = 0;
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}
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if( rt_device_write(dev, 0, buf, 256 ) == 256 )
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rt_kprintf("Write Success\n");
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rt_device_read(dev, 0, read, 256 );
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for(i = 0; i < 256; i++ )
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{
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if( buf[i] != read[i] )
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rt_kprintf("EE Failed %X != %X at %d\n", buf[i], read[i], i);
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}
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rt_kprintf("Finsh\n");
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}
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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FINSH_FUNCTION_EXPORT(ee_test, test system);
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#endif
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File diff suppressed because it is too large
Load Diff
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#ifndef I2C_H
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#define I2C_H
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#include "stm32f2xx.h"
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/* Exported constants --------------------------------------------------------*/
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#define SR1_AF_Set ((uint16_t)0x0400)
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#define SR1_ARLO_Set ((uint16_t)0x0200)
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#define SR1_BERR_Set ((uint16_t)0x0100)
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#define SR1_ADDR_Set ((uint16_t)0x0002)
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#define SR1_SB_Set ((uint16_t)0x0001)
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#define SR2_BUSY ((uint16_t)0x0002)
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#define SR2_MSL ((uint16_t)0x0001)
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#define CR1_SWRST_Set ((uint16_t)0x8000)
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/* I2C SPE mask */
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#define CR1_PE_Set ((uint16_t)0x0001)
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#define CR1_PE_Reset ((uint16_t)0xFFFE)
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/* I2C START mask */
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#define CR1_START_Set ((uint16_t)0x0100)
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#define CR1_START_Reset ((uint16_t)0xFEFF)
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#define CR1_POS_Set ((uint16_t)0x0800)
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#define CR1_POS_Reset ((uint16_t)0xF7FF)
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/* I2C STOP mask */
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#define CR1_STOP_Set ((uint16_t)0x0200)
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#define CR1_STOP_Reset ((uint16_t)0xFDFF)
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/* I2C ACK mask */
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#define CR1_ACK_Set ((uint16_t)0x0400)
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#define CR1_ACK_Reset ((uint16_t)0xFBFF)
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/* I2C ENARP mask */
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#define CR1_ENARP_Set ((uint16_t)0x0010)
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#define CR1_ENARP_Reset ((uint16_t)0xFFEF)
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/* I2C NOSTRETCH mask */
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#define CR1_NOSTRETCH_Set ((uint16_t)0x0080)
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#define CR1_NOSTRETCH_Reset ((uint16_t)0xFF7F)
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/* I2C registers Masks */
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#define CR1_CLEAR_Mask ((uint16_t)0xFBF5)
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/* I2C DMAEN mask */
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#define CR2_DMAEN_Set ((uint16_t)0x0800)
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#define CR2_DMAEN_Reset ((uint16_t)0xF7FF)
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/* I2C LAST mask */
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#define CR2_LAST_Set ((uint16_t)0x1000)
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#define CR2_LAST_Reset ((uint16_t)0xEFFF)
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/* I2C FREQ mask */
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#define CR2_FREQ_Reset ((uint16_t)0xFFC0)
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/* I2C ADD0 mask */
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#define OAR1_ADD0_Set ((uint16_t)0x0001)
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#define OAR1_ADD0_Reset ((uint16_t)0xFFFE)
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/* I2C ENDUAL mask */
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#define OAR2_ENDUAL_Set ((uint16_t)0x0001)
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#define OAR2_ENDUAL_Reset ((uint16_t)0xFFFE)
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/* I2C ADD2 mask */
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#define OAR2_ADD2_Reset ((uint16_t)0xFF01)
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/* I2C F/S mask */
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#define CCR_FS_Set ((uint16_t)0x8000)
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/* I2C CCR mask */
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#define CCR_CCR_Set ((uint16_t)0x0FFF)
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/* I2C FLAG mask */
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#define FLAG_Mask ((uint32_t)0x00FFFFFF)
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/* I2C Interrupt Enable mask */
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#define ITEN_Mask ((uint32_t)0x07000000)
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#define I2C_IT_BUF ((uint16_t)0x0400)
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#define I2C_IT_EVT ((uint16_t)0x0200)
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#define I2C_IT_ERR ((uint16_t)0x0100)
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#define ClockSpeed 400000
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#define I2C_DIRECTION_TX 0
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#define I2C_DIRECTION_RX 1
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#define OwnAddress1 0x28
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#define OwnAddress2 0x30
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#define I2C1_DMA_CHANNEL_TX DMA1_Stream6
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#define I2C1_DMA_CHANNEL_RX DMA1_Stream0
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#define I2C1_DMA_TX_IRQn DMA1_Stream6_IRQn
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#define I2C1_DMA_RX_IRQn DMA1_Stream0_IRQn
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#define I2C2_DMA_CHANNEL_TX DMA1_Stream2
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#define I2C2_DMA_CHANNEL_RX DMA1_Stream7
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#define I2C1_DR_Address 0x40005410
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#define I2C2_DR_Address 0x40005810
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#define I2C1_SDA_PIN GPIO_Pin_9
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#define I2C1_SCL_PIN GPIO_Pin_8
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#define I2C1_SDA_SOURCE GPIO_PinSource9
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#define I2C1_SCL_SOURCE GPIO_PinSource8
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#define I2C1_GPIO_PORT GPIOB
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#define I2C1_GPIO_CLK RCC_AHB1Periph_GPIOB
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#define I2C1_CLK RCC_APB1Periph_I2C1
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#define I2C_MEM_1Byte 1
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#define I2C_MEM_2Bytes 2
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typedef enum
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{
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Error = 0,
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Success = !Error
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}Status;
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typedef enum
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{
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Polling = 0x00,
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Interrupt = 0x01,
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DMA = 0x02
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} I2C_ProgrammingModel;
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void I2C1_INIT();
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Status I2C_AcknowledgePolling(I2C_TypeDef* I2Cx ,uint8_t Addr);
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Status I2C_IORW(I2C_TypeDef* I2Cx, uint8_t* pBuffer, uint32_t NumByteToRead, uint16_t memAddr, uint8_t SlaveAddress , uint8_t MemType );
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#endif
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