能否询问下，SPI读取ADS7229的寄存器配置问题，ATMEGA128每次最多读取8位，无法读取到正确的配置，请问该怎么正确读取ADS7229的寄存器配置和数据？
FS = 1； //置高电平，置低电平时读不到值
spi_write(0x0E); //write CFR
spi_write(0x0D); //CFR D11-D8
spi_write(0x0F); //CFR D7-D4
spi_write(0x0D); //CFR D3-D0
//回读配置
CFR_DATA = spi_read(0x0C); //read CFR
uint16 spi_read(uint8 read_cmd)
{
uint16 temp = 0;
uint8 cmd_rec = 0;
cmd_rec = read_cmd;
SPSR = 0; //CLEAR ERROR AND FLAG
//send the command
SPDR = read_cmd;
while((SPSR & 0X80) != 0X80); //WAIT THE DATA BYTE SEND END
SPSR = 0;
//read the data
while((SPSR & 0X80) != 0X80); //WAIT THE DATA BYTE SEND END
temp = (SPDR << 8) & 0xFF00;
SPSR = 0;
SPDR = 0; //启动SCK
while((SPSR & 0X80) != 0X80); //WAIT THE DATA BYTE SEND END
temp |= SPDR & 0x00FF;
SPSR = 0;
return temp;
}
