LINFLEX_3.LINCR1.B.INIT = 1;
LINFLEX_3.LINCR1.B.SLEEP = 0;
LINFLEX_3.LINCR1.B.BF = 0;
LINFLEX_3.UARTCR.B.UART = 1;
LINFLEX_3.UARTCR.B.RXEN = 1;
LINFLEX_3.UARTCR.B.TXEN = 1;
LINFLEX_3.UARTCR.B.WL0 = 1;
LINFLEX_3.UARTCR.B.PC0 = 1;
LINFLEX_3.UARTCR.B.PCE = 0;
LINFLEX_3.UARTCR.B.TFBM = 1;
// LINFLEX_3.UARTCR.B.RFBM = 1;
LINFLEX_3.LINIBRR.B.DIV_M = 20 * 10000 / 96 / 16; // 250k // Baud Rate = 9600, In Case fperi1 = 80 MHz
LINFLEX_3.LINFBRR.B.DIV_F = 0; // 7 // Baud Rate = 9600, In Case fperi1 = 80 MHz
LINFLEX_3.LINIER.B.DRIE = 1;
LINFLEX_3.UARTSR.B.DRFRFE = 1; // Clear Data Reception Completed Flag
LINFLEX_3.UARTSR.B.DTFTFF = 1; // Clear Data Transmission Completed Flag
LINFLEX_3.LINCR1.B.INIT = 0; // Normal Mode
LINFLEX_3.DMATXE.B.DTE0 = 1;
// LINFLEX_3.DMARXE.B.DRE0 = 1;
DMAMUX_0.CHCONFIG[0].R = 0xA5;
// DMAMUX_0.CHCONFIG[1].B.ENBL = 1; // channel 1 uart rx
// DMAMUX_0.CHCONFIG[1].B.TRIG = 0;
// DMAMUX_0.CHCONFIG[1].B.SOURCE = 0x26;
EDMA_0.TCD[0].CITER = 0x8;
EDMA_0.TCD[0].BITER = 0x8;
EDMA_0.TCD[0].NBYTES = 0x1;
EDMA_0.TCD[0].SADDR = (uint32)&lin3_tx_buffer[0];
EDMA_0.TCD[0].SOFF = 0x1;
EDMA_0.TCD[0].SSIZE = 0;
EDMA_0.TCD[0].SLAST = 0xFFFFFFFFFFFFFFF8;
EDMA_0.TCD[0].DADDR = (uint32)(&LINFLEX_3.BDRL) + 3;
EDMA_0.TCD[0].DOFF = 0;
EDMA_0.TCD[0].DSIZE = 0;
EDMA_0.TCD[0].D_REQ = 1;
EDMA_0.TCD[0].INT_MAJ = 1;
EDMA_0.DMAERQL.B.ERQ00 = 1;
There are a few more questions.
1. If I want to periodically send 30 bytes of data in a 20ms task, how do I control the sending and stopping of DMA? Can I enable it during the 20ms task by EDMA_0.DMAERQL.B.ERQ00 = 1; and disable it during the DMA completion interrupt by EDMA_0.DMAERQL.B.ERQ00 = 0?
In another words, how should i restart the DMA periodically in 20ms task or i dont have to do that manually?
2. When LINFlexD is in UART FIFO mode (TFBM = 1)，how many bytes are there in BDR? The manual says there is only one byte, is it true? if it is, why call it a FIFO? should't it be 4 bytes.
3. When there is a Destination Bus Error, you can see that the Citer has been decreasing. Why is this? Shouldn't it stop the DMA transmission? I'm sure no signal is coming out of the serial port, so who gives the DMA request?
thanks
