mcbsp 配置成UART,DX默认输出能配置吗?我用示波器测得默认值是低电平,单UART协议要求空闲状态是高电平,请问怎么设置呢?谢谢
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我不用edma直接查询发送和接收也是可以的吧?发送的时候查询SPCR1的XRDY位,接收的时候查询RRDY是否为1.这种方式可以吗?
//发送
Uart_transmit_data(0x0000); /起始位
Uart_transmit_data(0xffff); //0
Uart_transmit_data(0xffff); //1
Uart_transmit_data(0x0000); //2
Uart_transmit_data(0xffff); //3
Uart_transmit_data(0x0000); //4
Uart_transmit_data(0xffff); //5
Uart_transmit_data(0x0000); //6
Uart_transmit_data(0xffff); //7
Uart_transmit_data(0xff); //停止位
Uart_transmit_data(0xff); //停止位
Uint32 Uart_transmit_data(Uint32 dataout)
{
Uint32 data = 0;
int a ,b;
a= 1;
while(data != 0x020000)
{
data = SPCR1;
data= data & 0x020000;
}
DXR1 = dataout;
}
//接收
while(1)
{
Uart_receive_data(&Spi_rData);
data_r[i] =Spi_rData;
i++;
}
Uint32 Uart_receive_data(int *SPI_Rd_data)
{
while(data != 0x000002)//recevie ready
{
data = SPCR1;
data= data & 0x000002;
}
*SPI_Rd_data = DRR1;
}