typedef struct Radio_stuct { ... unsigned char AddressBuff[3]; unsigned char DataBuff[100]; ... } RadioStuct; void Star_CmdProtocol_WR(U8 outParamNum, U8 inParamNum) { U8 num 0, cmdID 0; U32 checkSum 0; U8 tempData 0; cmdID Radio.DataBuff[1]; SET_BUFFER_WITH_U32(Radio.AddressBuff, ADDRESS_OF_CMD_REG_BUFFER); //(parameter number 1command header 1 checkSum 1 address) * 3 bytes Star_Write(ACCESS_COMMAND, (outParamNum 3) * 3, Radio.AddressBuff); ... }遇见了一个疑问为什么只调用一次Star_Write函数这个函数的参数中仅仅指定了Radio.AddressBuff的地址实现了寄存器地址和command ID的传输。答案在于结构体定义的时候AddressBuff和DataBuff是相连续的。Star_Write函数指定了发送消息的长度(outParamNum 3) * 3 (0 3) * 3 9字节因此将DataBuff前6个字节一起发送给了收音机芯片。DataBuff的前六个字节存储着commandID和checksum。
typedef struct Radio_stuct { ... unsigned char AddressBuff[3]; unsigned char DataBuff[100]; ... } RadioStuct; void Star_CmdProtocol_WR(U8 outParamNum, U8 inParamNum) { U8 num 0, cmdID 0; U32 checkSum 0; U8 tempData 0; cmdID Radio.DataBuff[1]; SET_BUFFER_WITH_U32(Radio.AddressBuff, ADDRESS_OF_CMD_REG_BUFFER); //(parameter number 1command header 1 checkSum 1 address) * 3 bytes Star_Write(ACCESS_COMMAND, (outParamNum 3) * 3, Radio.AddressBuff); ... }遇见了一个疑问为什么只调用一次Star_Write函数这个函数的参数中仅仅指定了Radio.AddressBuff的地址实现了寄存器地址和command ID的传输。答案在于结构体定义的时候AddressBuff和DataBuff是相连续的。Star_Write函数指定了发送消息的长度(outParamNum 3) * 3 (0 3) * 3 9字节因此将DataBuff前6个字节一起发送给了收音机芯片。DataBuff的前六个字节存储着commandID和checksum。
