m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 125

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
2.6.2 Example of Serial Sound Interface operation
When using Serial Sound Interface (SSI), the DMA is recommended for reading and writing data quickly
from the receive buffer to the transmit buffer. A programming example using DMA is shown below Figure
2.6.5 shows an example of Serial Sound Interface transmit timing, and Figure 2.6.6 shows an example of
Serial Sound Interface receive timing.
/***** Serial Sound Interface initialization routine *****************************************************
*************************************************************************************************************/
/***** Setting example **********************************************************************************
*************************************************************************************************************/
/***** Activation processing routine ********************************************************************
*************************************************************************************************************/
/*******Serial Sound Interface is stopped at this point.
Serial Sound Interface is initialized by disabling.
The DMA to use is also initialized.
In this example, one DMA is used for each Serial Sound Interface input and output.
ssi1mr1 = 0x00;
ssi1mr0 = 0x00;
dm0sl = 0x00;
dm0con = 0x00;
dm1sl = 0x00;
dm1con = 0x00;
Audio transmission can be set before or after audio reception
The DMA to use is set.
DMA0 = audio data transmission and DMA1= audio data reception
dm0ic = 0x06;
dm0sl = 0x0e;
sar0 = (unsigned long)&txb_buffer;
dar0 = (unsigned long)&ssi1txb;
tcr0 = txb_counter;
dm1ic = 0x06;
dm1sl = 0x0a;
sar1 = (unsigned long)&ssi1rxb;
dar1 = (unsigned long)&rxb_buffer;
tcr1 = rxb_counter;
DMA activation. DMA0 can be activated before or after DMA1.
dm0con = 0x18;
dm1con = 0x28;
Serial Sound Interface is enabled and audio data transmission/reception starts.***********/
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/* SSI STOP */
/* SSI STOP */
/* DMA0 STOP */
/* DMA0 STOP */
/* DMA1 STOP */
/* DMA1 STOP */
/* DMA completion interrupt enabled */
/* DMA0 factor = SSI 1 transmit */
/* source address: buffer RAM, etc. */
/* destination address: SSI 1 transmit buffer */
/* DMA0 transfer cycle setting */
/* DMA completion interrupt enabled */
/* DMA1 factor = SSI 1 receive */
/* source address: SSI 1 receive */
/* destination address: buffer RAM, etc. */
/* DMA1 transfer cycle setting */
/* DMA0 start [16bit, SRC = inc, single] */
/* DMA1 start [16bit, DES = inc, single] */
2. Serial sound interface