一、I2C的協(xié)議這里就不贅述了，隨便搜一下就可以了解。

二、I2C的初始化

1.Enable I2C clock

configure the PSC register(if it is driven by PSC)PSC相關說明可以查看手冊

2. Configure the PinMultiplexing registers

3. Place I2C in reset

set IRS =0 in ICMDR register

4.Configure the peripheral clock operation frequency(ICPSC)

NOTE:the frequency should be between 6.7 and 13.3MHz

5.Configure i2c master clock frequency:

configure ICCLKL , ICCLKH

7.Make sure the interrupt status register(ICSTR) is cleared:

Read ICSTR and write it back (write 1 to clear) ICSTR = ICSTR

Read ICIVR until it is 0.?

8.Take i2c controller out of reset?

set IRS=1 in ICMDR

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三、I2C作為master發(fā)送數(shù)據(jù)的配置

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1. Wait until bus bit is cleared (BB =0 in ICSTR)

2.Configure ICMDR register

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• configure I2C as Master ( MST = 1 );
• indicate the i2c configuration to be used(if TRX = 0, device configured as Data Receiver);
• configure serial data formats( eg. ?XA = 0, 7-bit addressing format );
• set RM = 0 to disable repeat mode;
• set DLB = 0 to disable loopback mode;
• set FDF = 0 to disable free data format;
• optional:disable start byte mode if addressing a fully fledged i2c device (set STB = 0 );
• set number of bits to transfer to be 8 bits (BC = 0) ;
• 設置仿真器斷點無響應，bus繼續(xù)運行， ICMDR中 FREE=1

3.設置發(fā)送數(shù)據(jù)長度（字節(jié)）ICCNT

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4.Configure Slave Address( ICSAR = 7bit address)

5.Generate a START event ,followed by Slave Address,etc.(set STT =1 in ICMDR)

6.循環(huán)發(fā)送數(shù)據(jù)，數(shù)據(jù)寫入ICDXR，等待ICSTR中ICXRDY=1，表明數(shù)據(jù)搬運完成。并設置超時重新初始化init（我這設置的是while循環(huán)不超過500000）

7. End transfer/release bus when transfer is done. Generate a STOP event (set STP = 1 in ICMDR).?

四、I2C作為master讀取數(shù)據(jù)

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1. Wait until bus bit is cleared (BB =0 in ICSTR)

2.Configure ICMDR register

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• configure I2C as Master ( MST = 1 );
• indicate the i2c configuration to be used(if TRX = 0, device configured as Data Receiver);
• configure serial data formats( eg. ?XA = 0, 7-bit addressing format );
• set RM = 0 to disable repeat mode;
• set DLB = 0 to disable loopback mode;
• set FDF = 0 to disable free data format;
• optional:disable start byte mode if addressing a fully fledged i2c device (set STB = 0 );
• set number of bits to transfer to be 8 bits (BC = 0) ;
• 設置仿真器斷點無響應，bus繼續(xù)運行， ICMDR中 FREE=1

3.設置發(fā)送數(shù)據(jù)長度（字節(jié)）ICCNT

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4.Configure Slave Address( ICSAR = 7bit address)

5.Generate a START event ,followed by Slave Address,etc.(set STT =1 in ICMDR)

6.循環(huán)接收數(shù)據(jù)

等待ICSTR中ICRRDY=1，為1時表明數(shù)據(jù)可以讀取，并設置超時重新初始化init（我這設置的是while循環(huán)不超過500000），讀取ICDRR中數(shù)據(jù)。當數(shù)據(jù)為最后一個字節(jié)時發(fā)送NACK（ICMDR中NACKMOD=1）

7. End transfer/release bus when transfer is done. Generate a STOP event (set STP = 1 in ICMDR).?

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