版本：sdk-xgs-robo-6.3.8 平臺：BCM53344 應用：控制POE芯片
描述：POE控制芯片使用PD69200，使用i2c與其通信，每次需要發送15字節數據，并接受15字節的返回數據。

1.更改函數
打開文件sdk-xgs-robo-6.3.8/src/soc/i2c/smbus.c 更改如下： int soc_i2c_block_read(int unit, i2c_saddr_t saddr,uint8 com, uint8* count, uint8* data) {//... 省略 ...I2C_LOCK(unit); // 53344芯片在定義了BCM_CMICM_SUPPORT,所以會運行下面的代碼。 #ifdef BCM_CMICM_SUPPORTif(soc_feature(unit, soc_feature_cmicm) && !SOC_IS_SAND(unit)) { retry:
　　//這個函數是smbus協議的命令格式。與I2C有些區別。注釋掉發送地址和com的地方。
　　//直接讀取數據 // rval = SOC_I2C_TX_ADDR(saddr); // WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval); // rval = com; // WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval);rval = SOC_I2C_RX_ADDR(saddr);soc_reg_field_set(unit, CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr, &rval, MASTER_WR_STATUSf, 1); /* Last Byte */WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval);//更改要接受的數據個數。默認是0，因此會讀取0個數據。
　　　　//查看芯片手冊，需要將CMIC_I2CM_SMBus_Master_Command寄存器的最低8位（RD_BYTE_COUNT),設置為要讀取的字節個數。 // rval = 0;rval = *count;soc_reg_field_set(unit, CMIC_I2CM_SMBUS_MASTER_COMMANDr, &rval, SMBUS_PROTOCOLf, SMBUS_BLOCK_READ);WRITE_CMIC_I2CM_SMBUS_MASTER_COMMANDr(unit,rval);rv = smbus_start_wait(unit);if (rv == SOC_E_NONE) {
　　　　//直接讀取即可，這一部分也不需要，smbus協議才需要 // READ_CMIC_I2CM_SMBUS_MASTER_DATA_READr(unit, &rval); // *count = (uint8) (rval & 0xff);ptr = data;for( i = 0; i < *count; i++, ptr++) {READ_CMIC_I2CM_SMBUS_MASTER_DATA_READr(unit, &rval);*ptr = (uint8) (rval & 0xff);}} else if (rt-- > 0) {goto retry;} else {rv = SOC_E_TIMEOUT;}} else　　//后面的不運行 #endif// ... 省略 ...
}
//同理，write函數也進行注釋 int soc_i2c_block_write(int unit, i2c_saddr_t saddr,uint8 com, uint8 count, uint8* data) {int i,rv = SOC_E_NONE;uint8* ptr = NULL; #ifdef BCM_CMICM_SUPPORTuint32 rval;int rt = 5; #endifsoc_cm_debug(DK_I2C, "i2c%d: soc_i2c_block_write %02x bytes @ %02x - %02x\n", unit, count, saddr, com);#ifdef BCM_CALADAN3_SVKif (unit == -1) {return cpu_i2c_block_write(unit, saddr, com, data, count);} #endifI2C_LOCK(unit); #ifdef BCM_CMICM_SUPPORTif(soc_feature(unit, soc_feature_cmicm) && !SOC_IS_SAND(unit)) { retry:rval = SOC_I2C_TX_ADDR(saddr);WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval); // rval = com; // WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval); // rval = count; // WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval); ptr = data;for( i = 0; i < (int) (count - 1); i++, ptr++) {rval = (uint32) *ptr;WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval);}rval = (uint32) *ptr;soc_reg_field_set(unit, CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr, &rval, MASTER_WR_STATUSf, 1); /* Last Byte */WRITE_CMIC_I2CM_SMBUS_MASTER_DATA_WRITEr(unit, rval);rval = 0;soc_reg_field_set(unit, CMIC_I2CM_SMBUS_MASTER_COMMANDr, &rval, SMBUS_PROTOCOLf, SMBUS_BLOCK_WRITE);WRITE_CMIC_I2CM_SMBUS_MASTER_COMMANDr(unit,rval);rv = smbus_start_wait(unit);if (rv != SOC_E_NONE && rt-- > 0) {goto retry;} else if (rt < 0) {rv = SOC_E_TIMEOUT;}} else #endif

2.導出全局符號
打開文件 sdk/systems/linux/kernel/modules/include/bcmx_export.h
最后添加：
　　#include <soc/i2c.h>
　　EXPORT_SYMBOL(soc_i2c_is_attached);
　　EXPORT_SYMBOL(soc_i2c_attach);
　　EXPORT_SYMBOL(soc_i2c_block_read);
　　EXPORT_SYMBOL(soc_i2c_block_write);

之后從新編譯SDK即可。

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