MAC7200 datasheet(574/976 Pages) FREESCALE

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Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

496

Freescale Semiconductor

volatile unsigned char *CHCONFIG12= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000C);

volatile unsigned char *CHCONFIG13= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000D);

volatile unsigned char *CHCONFIG14= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000E);

volatile unsigned char *CHCONFIG15= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000F);

In File main.c:

#include "registers.h"

*CHCONFIG2 = 0x00;

*CHCONFIG2 = 0x85;

27.7.6

Disabling a Source

A particular DMA source may be disabled by not writing the corresponding source value into any of the

CHCONFIG registers. Additionally, some module specific configuration may be necessary. Please refer

to the appropriate section for more details.

27.7.6.1

Switching the Source of a DMA Channel

1. Disable the DMA channel in the DMA and re-configure the channel for the new source

2. Clear the ENBL and TRIG bits of the DMA channel

3. Select the source to be routed to the DMA channel. Write to the corresponding CHCONFIG

Example 27-4. Switch DMA Channel 8 from DSPI_A transmit to ESCI_A transmit

1. In the DMA configuration registers, disable DMA channel 8 and re-configure it to handle the

DSPI_A transmits

2. Write 0x00 to CHCONFIG8 (Base Address + 0x08)

3. Write 0x87 to CHCONFIG8 (Base Address + 0x08). In this case, setting the TRIG bit would have

no effect, because channels 8–15 do not support the periodic triggering functionality

The following code example illustrates steps #2 and #4 above:

In File registers.h:

#define DMAMUX_BASE_ADDR

0xFC084000/* Example only ! */

/* Following example assumes char is 8-bits */

volatile unsigned char *CHCONFIG0 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0000);

volatile unsigned char *CHCONFIG1 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0001);

volatile unsigned char *CHCONFIG2 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0002);

volatile unsigned char *CHCONFIG3 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0003);

volatile unsigned char *CHCONFIG4 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0004);

volatile unsigned char *CHCONFIG5 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0005);

volatile unsigned char *CHCONFIG6 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0006);

volatile unsigned char *CHCONFIG7 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0007);

volatile unsigned char *CHCONFIG8 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0008);

volatile unsigned char *CHCONFIG9 = (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x0009);

volatile unsigned char *CHCONFIG10= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000A);

volatile unsigned char *CHCONFIG11= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000B);

volatile unsigned char *CHCONFIG12= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000C);

volatile unsigned char *CHCONFIG13= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000D);

volatile unsigned char *CHCONFIG14= (volatile unsigned char *) (DMAMUX_BASE_ADDR+0x000E);

MAC7200 Datasheet(PDF) 574 Page - Freescale Semiconductor, Inc

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