/*************************************************
名称：spi_rw(u8 *data_buff, u8 byte_quantity, u8 reg_address, u8 control_byte)
功能：spi多字节读写
输入参数：
u8 *data_buff 数据指针
u8 byte_quantity 读写字节数量
u8 reg_address 寄存器地址
u8 control_byte 读写控制标识
输出参数：无
返回值： 无
**************************************************/
void spi_rw(u8 *data_buff, u8 byte_quantity, u8 reg_address, u8 control_byte)
{
u8 i;
if(control_byte == 0) //write
{
spi_nss_low();
spi_rw_byte(reg_address);
for(i = 0; i < byte_quantity; i++)
{
spi_rw_byte(*data_buff);
data_buff++;
}
spi_nss_high();
}
else if(control_byte == 1)
{
spi_nss_low();
spi_rw_byte(reg_address);
for(i = 0; i < byte_quantity; i++)
{
*data_buff = spi_rw_byte(0);
data_buff++;
}
spi_nss_high();
}
}
//write buffer
uint8_t spi_write_buf(uint8_t cmd, uint8_t* const data, uint16_t size)
{
uint8_t status =0;
uint8_t* pdata = data;
uint8_t i = 0;
SPI_ENABLE(); //Select chip
status = spi_rw_byte(cmd); //write tx payload
for(i = 0 ; i < size; i++)
{
printf("0x%x,",*pdata);
spi_rw_byte(*pdata++);
}
SPI_DISABLE(); //Deselect chip
return status;
}
//Sends one byte command
uint8_t spi_send_cmd(uint8_t cmd)
{
uint8_t status;
SPI_ENABLE(); //Select chip
status = spi_rw_byte(cmd);
SPI_DISABLE(); //Deselect chip
return(status);
}