NS953_SerialComm.c
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/*******************************************************************************
* Copyright Statement:
* --------------------
* This software is protected by Copyright and the information contained
* herein is confidential. The software may not be copied and the information
* contained herein may not be used or disclosed except with the written
* permission of MediaTek Inc. (C) 2001
*
*******************************************************************************/
/*******************************************************************************
*
* Filename:
* ---------
* NS953_SerialComm.c
*
* Project:
* --------
* MAUI
*
* Description:
* ------------
*
* Serial communication interfaces (I2C protocol)
*
* Author:
* -------
* -------
*
*==============================================================================
* HISTORY
* Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
*------------------------------------------------------------------------------
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*------------------------------------------------------------------------------
* Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
*==============================================================================
*******************************************************************************/
#if (defined(NS953))
#include "l1audio_def.h"
/* GPIO definition */
#define SDA 9 /* MT6227EVB : 9 */
#define SCL 8 /* MT6227EVB : 8 */
#define CRYCLK 12 /* MT6227EVB: 12 */
void GPIO_ModeSetup(kal_uint16 pin, kal_uint16 conf_dada);
void GPIO_InitIO(char direction, char port);
void GPIO_WriteIO(char data,char port);
char GPIO_ReadIO(char port);
uint8 const FM_RADIO_INPUT_LEVEL_THRESHOLD = 1;
void SerialCommStart(void) /* start or re-start */
{
GPIO_WriteIO(0,SCL);
GPIO_InitIO(1,SDA);
GPIO_WriteIO(1,SDA);
GPIO_WriteIO(1,SCL);
GPIO_WriteIO(0,SDA); /* start condition */
}
void SerialCommStop(void)
{
GPIO_WriteIO(0,SCL);
GPIO_InitIO(1,SDA);
GPIO_WriteIO(0,SDA);
GPIO_WriteIO(1,SCL);
GPIO_WriteIO(1,SDA); /* stop condition */
}
uint8 SerialCommTxByte(uint8 data) /* return 0 --> ack */
{
int32 i;
for(i=7; i>=0; i--){
GPIO_WriteIO( 0, SCL); /* low */
/* The bus operates at a maximum clock frequency of 400 kHz */
if(i==7)GPIO_InitIO(1,SDA); // dummy
GPIO_WriteIO(((data>>i)&0x01), SDA);
GPIO_WriteIO( 1, SCL); /* high */
}
GPIO_WriteIO(0, SCL); /* low */
GPIO_InitIO(0,SDA);
GPIO_WriteIO(1, SCL); /* high */
return GPIO_ReadIO(SDA);
}
void SerialCommRxByte(uint8 *data, uint8 ack)
{
int32 i;
uint32 dataCache;
dataCache = 0;
for(i=7; i>=0; i--){
GPIO_WriteIO(0, SCL);
if(i==7)GPIO_InitIO(0,SDA);
GPIO_WriteIO(1, SCL);
dataCache |= (GPIO_ReadIO(SDA)<<i);
}
GPIO_WriteIO(0, SCL);
GPIO_InitIO(1,SDA);
GPIO_WriteIO(ack, SDA);
GPIO_WriteIO(1, SCL);
*data = (uint8)dataCache;
}
void SerialCommInit(void)
{
GPIO_ModeSetup(SCL,0);
GPIO_ModeSetup(SDA,0);
GPIO_InitIO(1,SCL);
}
void SerialCommCryClkOn(void)
{
GPIO_ModeSetup(CRYCLK,3); /* 32.768kHz reference frequency */
}
void SerialCommCryClkOff(void)
{
GPIO_ModeSetup(CRYCLK,0);
}
#endif