AIC32 音频警报
Mcbsp 是多通道串行接口,可以当作 SPI 使用,也可以当作非 SPI 功能。 MCBSP 其实就是一个串行总线协议,只不过有两个时钟:接收时钟和发送时钟。这导致接收和发送独立使用自己的钟;还有就是多了两个状态标志信号:一个是发送同步信号一个是接收同步信号。
1 TLV320AIC23 芯片介绍
TLV320AIC23 是一个高性能的多媒体数字语音编解码器,它的内部 ADC 和DAC 转换模块带有完整的数字滤波器。(digital interpolation filter s)数据传输宽度可以是 16 位, 20 位, 24 位和 32 位,采样频率范围支持从 8khz到 96khz。在 ADC 采集达到 96khz 时噪音为 90-dBA,能够高保真的保存音频信号。在 DAC 转换达到 96khz 时噪音为 100-Dba,能够高品质的数字回放音频,在回放时仅仅减少 23 mW。
TLV320AIC23 详细指标:
①高品质的立体声多媒体数字语音编解码器
②在 ADC 采用 48 kHz 采样率时噪音 90-dB
③在 DAC 采用 48 kHz 采样率时噪音 100-dB
④1.42 V – 3.6 V 核心数字电压: 兼容 TI F28x DSP 内核电压
⑤2.7 V – 3.6 V 缓冲器和模拟:兼容 TI F28x DSP 内核电压
⑥支持 8-kHz – 96-kHz 的采样频率
⑦软件控制通过 TI McBSP 接口
⑧音频数据输入输出通过 TI McBSP 接口
立体声接口如下图所示:
AIC23 芯片是通过 28335 的 mcbsp 接口来控制和传输音频数据的。下图是 AIC23 芯片的映射寄存器地址及名称。
2 硬件设计
本实验使用到硬件资源如下:
(1)D1 指示灯
(2)TLV320AIC23 音频模块
3 软件设计
Uint16 AIC23Write(int Address,int Data);
void Delay(int time);
void Mydelay(Uint32 k);
int DA_wptr,y;
Uint16 j=3;
/*******************************************************************************
* 函 数 名 : main
* 函数功能 : 主函数
* 输 入 : 无
* 输 出 : 无
*******************************************************************************/
void main()
{
Uint16 temp,i;
InitSysCtrl();
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
LED_Init();
TIM0_Init(150,200000);//200ms
UARTa_Init(4800);
InitMcbspaGpio(); //zq
InitI2CGpio();
I2CA_Init();
AIC23Write(0x00,0x00);
Delay(100);
AIC23Write(0x02,0x00);
Delay(100);
AIC23Write(0x04,0x7f);
Delay(100);
AIC23Write(0x06,0x7f);
Delay(100);
AIC23Write(0x08,0x14);
Delay(100);
AIC23Write(0x0A,0x00);
Delay(100);
AIC23Write(0x0C,0x00);
Delay(100);
AIC23Write(0x0E,0x43);
Delay(100);
AIC23Write(0x10,0x23);
Delay(100);
AIC23Write(0x12,0x01);
Delay(100); //AIC23Init
InitMcbspa(); // Initalize the Mcbsp-A
//发出报警声
while(1)
{
for(temp=30000;temp>0;temp-=100)
{
for(i=0;i<2;i++)
{
y=5000;
Mydelay(temp);
McbspaRegs.DXR1.all = y;// 输出左声道数据
McbspaRegs.DXR2.all = y;// 输出右声道数据
y=-5000;
Mydelay(temp);
McbspaRegs.DXR1.all = y;// 输出左声道数据
McbspaRegs.DXR2.all = y;// 输出右声道数据
}
}
}
}
void I2CA_Init(void)
{
// Initialize I2C
I2caRegs.I2CSAR = 0x001A; // Slave address - EEPROM control code
#if (CPU_FRQ_150MHZ) // Default - For 150MHz SYSCLKOUT
I2caRegs.I2CPSC.all = 14; // Prescaler - need 7-12 Mhz on module clk (150/15 = 10MHz)
#endif
#if (CPU_FRQ_100MHZ) // For 100 MHz SYSCLKOUT
I2caRegs.I2CPSC.all = 9; // Prescaler - need 7-12 Mhz on module clk (100/10 = 10MHz)
#endif
I2caRegs.I2CCLKL = 100; // NOTE: must be non zero
I2caRegs.I2CCLKH = 100; // NOTE: must be non zero
I2caRegs.I2CIER.all = 0x24; // Enable SCD & ARDY interrupts
// I2caRegs.I2CMDR.all = 0x0020; // Take I2C out of reset
I2caRegs.I2CMDR.all = 0x0420; // Take I2C out of reset //zq
// Stop I2C when suspended
I2caRegs.I2CFFTX.all = 0x6000; // Enable FIFO mode and TXFIFO
I2caRegs.I2CFFRX.all = 0x2040; // Enable RXFIFO, clear RXFFINT,
return;
}
Uint16 AIC23Write(int Address,int Data)
{
if (I2caRegs.I2CMDR.bit.STP == 1)
{
return I2C_STP_NOT_READY_ERROR;
}
// Setup slave address
I2caRegs.I2CSAR = 0x1A;
// Check if bus busy
if (I2caRegs.I2CSTR.bit.BB == 1)
{
return I2C_BUS_BUSY_ERROR;
}
// Setup number of bytes to send
// MsgBuffer + Address
I2caRegs.I2CCNT = 2;
I2caRegs.I2CDXR = Address;
I2caRegs.I2CDXR = Data;
// Send start as master transmitter
I2caRegs.I2CMDR.all = 0x6E20;
return I2C_SUCCESS;
}
void Delay(int time)
{
int i,j,k=0;
for(i=0;i<time;i++)
for(j=0;j<1024;j++)
k++;
}
void Mydelay(Uint32 k)
{
while(k--);
}
// TI File $Revision: /main/15 $
// Checkin $Date: September 20, 2007 14:47:41 $
//###########################################################################
//
// FILE: DSP2833x_McBSP.c
//
// TITLE: DSP2833x Device McBSP Initialization & Support Functions.
//
//###########################################################################
// $TI Release: DSP2833x Header Files V1.01 $
// $Release Date: September 26, 2007 $
//###########################################################################
#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
//---------------------------------------------------------------------------
// MCBSP_INIT_DELAY determines the amount of CPU cycles in the 2 sample rate
// generator (SRG) cycles required for the Mcbsp initialization routine.
// MCBSP_CLKG_DELAY determines the amount of CPU cycles in the 2 clock
// generator (CLKG) cycles required for the Mcbsp initialization routine.
// For the functions defined in Mcbsp.c, MCBSP_INIT_DELAY and MCBSP_CLKG_DELAY
// are based off of either a 150 MHz SYSCLKOUT (default) or a 100 MHz SYSCLKOUT.
//
// CPU_FRQ_100MHZ and CPU_FRQ_150MHZ are defined in DSP2833x_Examples.h
//---------------------------------------------------------------------------
#if CPU_FRQ_150MHZ // For 150 MHz SYSCLKOUT(default)
#define CPU_SPD 150E6
#define MCBSP_SRG_FREQ CPU_SPD/4 // SRG input is LSPCLK (SYSCLKOUT/4) for examples
#endif
#if CPU_FRQ_100MHZ // For 100 MHz SYSCLKOUT
#define CPU_SPD 100E6
#define MCBSP_SRG_FREQ CPU_SPD/4 // SRG input is LSPCLK (SYSCLKOUT/4) for examples
#endif
#define MCBSP_INIT_DELAY 2*(CPU_SPD/MCBSP_SRG_FREQ) // # of CPU cycles in 2 SRG cycles-init delay
#define CLKGDV_VAL 0
#define MCBSP_CLKG_DELAY 2*(CPU_SPD/(MCBSP_SRG_FREQ/(1+CLKGDV_VAL))) // # of CPU cycles in 2 CLKG cycles-init delay
//---------------------------------------------------------------------------
// InitMcbsp:
//---------------------------------------------------------------------------
// This function initializes the McBSP to a known state.
//
void delay_loop(void); // Delay function used for SRG initialization
void clkg_delay_loop(void); // Delay function used for CLKG initialization
void InitMcbsp(void)
{
InitMcbspa();
#if DSP28_MCBSPB
InitMcbspb();
#endif // end DSP28_MCBSPB
}
void InitMcbspa(void)
{
// McBSP-A register settings
McbspaRegs.SPCR1.all=0;
McbspaRegs.SPCR2.all=0;
McbspaRegs.SPCR1.all = SPCR10_VAL;
McbspaRegs.SPCR2.all = SPCR20_VAL;
McbspaRegs.PCR.all = PCR0_VAL;
McbspaRegs.XCR1.all = XCR10_VAL;
McbspaRegs.XCR2.all = XCR20_VAL;
McbspaRegs.RCR1.all = RCR10_VAL;
McbspaRegs.RCR2.all = RCR20_VAL;
McbspaRegs.DXR1.all = 0;
McbspaRegs.MFFINT.bit.RINT = 1;
McbspaRegs.SPCR1.bit.RRST = 1;
McbspaRegs.SPCR2.bit.XRST = 1;
}
#if (DSP28_MCBSPB)
void InitMcbspb(void)
{
// McBSP-B register settings
McbspbRegs.SPCR2.all=0x0000; // Reset FS generator, sample rate generator & transmitter
McbspbRegs.SPCR1.all=0x0000; // Reset Receiver, Right justify word
McbspbRegs.SPCR1.bit.DLB = 1; // Enable loopback mode for test. Comment out for normal McBSP transfer mode.
McbspbRegs.MFFINT.all=0x0; // Disable all interrupts
McbspbRegs.RCR2.all=0x0; // Single-phase frame, 1 word/frame, No companding (Receive)
McbspbRegs.RCR1.all=0x0;
McbspbRegs.XCR2.all=0x0; // Single-phase frame, 1 word/frame, No companding (Transmit)
McbspbRegs.XCR1.all=0x0;
McbspbRegs.SRGR2.bit.CLKSM = 1; // CLKSM=1 (If SCLKME=0, i/p clock to SRG is LSPCLK)
McbspbRegs.SRGR2.bit.FPER = 31; // FPER = 32 CLKG periods
McbspbRegs.SRGR1.bit.FWID = 0; // Frame Width = 1 CLKG period
McbspbRegs.SRGR1.bit.CLKGDV = CLKGDV_VAL; // CLKG frequency = LSPCLK/(CLKGDV+1)
McbspbRegs.PCR.bit.FSXM = 1; // FSX generated internally, FSR derived from an external source
McbspbRegs.PCR.bit.CLKXM = 1; // CLKX generated internally, CLKR derived from an external source
delay_loop(); // Wait at least 2 SRG clock cycles
McbspbRegs.SPCR2.bit.GRST=1; // Enable the sample rate generator
clkg_delay_loop(); // Wait at least 2 CLKG cycles
McbspbRegs.SPCR2.bit.XRST=1; // Release TX from Reset
McbspbRegs.SPCR1.bit.RRST=1; // Release RX from Reset
McbspbRegs.SPCR2.bit.FRST=1; // Frame Sync Generator reset
}
#endif // end DSP28_MCBSPB
// McBSP-A Data Lengths
void InitMcbspa8bit(void)
{
McbspaRegs.RCR1.bit.RWDLEN1=0; // 8-bit word
McbspaRegs.XCR1.bit.XWDLEN1=0; // 8-bit word
}
void InitMcbspa12bit(void)
{
McbspaRegs.RCR1.bit.RWDLEN1=1; // 12-bit word
McbspaRegs.XCR1.bit.XWDLEN1=1; // 12-bit word
}
void InitMcbspa16bit(void)
{
McbspaRegs.RCR1.bit.RWDLEN1=2; // 16-bit word
McbspaRegs.XCR1.bit.XWDLEN1=2; // 16-bit word
}
void InitMcbspa20bit(void)
{
McbspaRegs.RCR1.bit.RWDLEN1=3; // 20-bit word
McbspaRegs.XCR1.bit.XWDLEN1=3; // 20-bit word
}
void InitMcbspa24bit(void)
{
McbspaRegs.RCR1.bit.RWDLEN1=4; // 24-bit word
McbspaRegs.XCR1.bit.XWDLEN1=4; // 24-bit word
}
void InitMcbspa32bit(void)
{
McbspaRegs.RCR1.bit.RWDLEN1=5; // 32-bit word
McbspaRegs.XCR1.bit.XWDLEN1=5; // 32-bit word
}
// McBSP-B Data Lengths
#if (DSP28_MCBSPB)
void InitMcbspb8bit(void)
{
McbspbRegs.RCR1.bit.RWDLEN1=0; // 8-bit word
McbspbRegs.XCR1.bit.XWDLEN1=0; // 8-bit word
}
void InitMcbspb12bit(void)
{
McbspbRegs.RCR1.bit.RWDLEN1=1; // 12-bit word
McbspbRegs.XCR1.bit.XWDLEN1=1; // 12-bit word
}
void InitMcbspb16bit(void)
{
McbspbRegs.RCR1.bit.RWDLEN1=2; // 16-bit word
McbspbRegs.XCR1.bit.XWDLEN1=2; // 16-bit word
}
void InitMcbspb20bit(void)
{
McbspbRegs.RCR1.bit.RWDLEN1=3; // 20-bit word
McbspbRegs.XCR1.bit.XWDLEN1=3; // 20-bit word
}
void InitMcbspb24bit(void)
{
McbspbRegs.RCR1.bit.RWDLEN1=4; // 24-bit word
McbspbRegs.XCR1.bit.XWDLEN1=4; // 24-bit word
}
void InitMcbspb32bit(void)
{
McbspbRegs.RCR1.bit.RWDLEN1=5; // 32-bit word
McbspbRegs.XCR1.bit.XWDLEN1=5; // 32-bit word
}
#endif //end DSP28_MCBSPB
void InitMcbspGpio(void)
{
InitMcbspaGpio();
#if DSP28_MCBSPB
InitMcbspbGpio();
#endif // end DSP28_MCBSPB
}
void InitMcbspaGpio(void)
{
EALLOW;
/* Configure McBSP-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be McBSP functional pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 2; // GPIO20 is MDXA pin
GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 2; // GPIO21 is MDRA pin
GpioCtrlRegs.GPAMUX2.bit.GPIO22 = 2; // GPIO22 is MCLKXA pin
//GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 2; // GPIO7 is MCLKRA pin (Comment as needed)
GpioCtrlRegs.GPBMUX2.bit.GPIO58 = 1; // GPIO58 is MCLKRA pin (Comment as needed)
GpioCtrlRegs.GPAMUX2.bit.GPIO23 = 2; // GPIO23 is MFSXA pin
//GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 2; // GPIO5 is MFSRA pin (Comment as needed)
GpioCtrlRegs.GPBMUX2.bit.GPIO59 = 1; // GPIO59 is MFSRA pin (Comment as needed)
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPAPUD.bit.GPIO20 = 0; // Enable pull-up on GPIO20 (MDXA)
GpioCtrlRegs.GPAPUD.bit.GPIO21 = 0; // Enable pull-up on GPIO21 (MDRA)
GpioCtrlRegs.GPAPUD.bit.GPIO22 = 0; // Enable pull-up on GPIO22 (MCLKXA)
//GpioCtrlRegs.GPAPUD.bit.GPIO7 = 0; // Enable pull-up on GPIO7 (MCLKRA) (Comment as needed)
GpioCtrlRegs.GPBPUD.bit.GPIO58 = 0; // Enable pull-up on GPIO58 (MCLKRA) (Comment as needed)
GpioCtrlRegs.GPAPUD.bit.GPIO23 = 0; // Enable pull-up on GPIO23 (MFSXA)
//GpioCtrlRegs.GPAPUD.bit.GPIO5 = 0; // Enable pull-up on GPIO5 (MFSRA) (Comment as needed)
GpioCtrlRegs.GPBPUD.bit.GPIO59 = 0; // Enable pull-up on GPIO59 (MFSRA) (Comment as needed)
/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPAQSEL2.bit.GPIO20 = 3; // Asynch input GPIO20 (MDXA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO21 = 3; // Asynch input GPIO21 (MDRA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO22 = 3; // Asynch input GPIO22 (MCLKXA)
//GpioCtrlRegs.GPAQSEL1.bit.GPIO7 = 3; // Asynch input GPIO7 (MCLKRA) (Comment as needed)
GpioCtrlRegs.GPBQSEL2.bit.GPIO58 = 3; // Asynch input GPIO58(MCLKRA) (Comment as needed)
GpioCtrlRegs.GPAQSEL2.bit.GPIO23 = 3; // Asynch input GPIO23 (MFSXA)
//GpioCtrlRegs.GPAQSEL1.bit.GPIO5 = 3; // Asynch input GPIO5 (MFSRA) (Comment as needed)
GpioCtrlRegs.GPBQSEL2.bit.GPIO59 = 3; // Asynch input GPIO59 (MFSRA) (Comment as needed)
EDIS;
}
#if DSP28_MCBSPB
void InitMcbspbGpio(void)
{
EALLOW;
/* Configure McBSP-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be McBSP functional pins.
// Comment out other unwanted lines.
//GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 3; // GPIO12 is MDXB pin (Comment as needed)
GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 3; // GPIO24 is MDXB pin (Comment as needed)
//GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 3; // GPIO13 is MDRB pin (Comment as needed)
GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 3; // GPIO25 is MDRB pin (Comment as needed)
//GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 3; // GPIO14 is MCLKXB pin (Comment as needed)
GpioCtrlRegs.GPAMUX2.bit.GPIO26 = 3; // GPIO26 is MCLKXB pin (Comment as needed)
GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 3; // GPIO3 is MCLKRB pin (Comment as needed)
//GpioCtrlRegs.GPBMUX2.bit.GPIO60 = 1; // GPIO60 is MCLKRB pin (Comment as needed)
//GpioCtrlRegs.GPAMUX1.bit.GPIO15 = 3; // GPIO15 is MFSXB pin (Comment as needed)
GpioCtrlRegs.GPAMUX2.bit.GPIO27 = 3; // GPIO27 is MFSXB pin (Comment as needed)
GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 3; // GPIO1 is MFSRB pin (Comment as needed)
//GpioCtrlRegs.GPBMUX2.bit.GPIO61 = 1; // GPIO61 is MFSRB pin (Comment as needed)
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0; // Enable pull-up on GPIO24 (MDXB) (Comment as needed)
//GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0; // Enable pull-up on GPIO12 (MDXB) (Comment as needed)
GpioCtrlRegs.GPAPUD.bit.GPIO25 = 0; // Enable pull-up on GPIO25 (MDRB) (Comment as needed)
//GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0; // Enable pull-up on GPIO13 (MDRB) (Comment as needed)
GpioCtrlRegs.GPAPUD.bit.GPIO26 = 0; // Enable pull-up on GPIO26 (MCLKXB) (Comment as needed)
//GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0; // Enable pull-up on GPIO14 (MCLKXB) (Comment as needed)
GpioCtrlRegs.GPAPUD.bit.GPIO3 = 0; // Enable pull-up on GPIO3 (MCLKRB) (Comment as needed)
//GpioCtrlRegs.GPBPUD.bit.GPIO60 = 0; // Enable pull-up on GPIO60 (MCLKRB) (Comment as needed)
GpioCtrlRegs.GPAPUD.bit.GPIO27 = 0; // Enable pull-up on GPIO27 (MFSXB) (Comment as needed)
//GpioCtrlRegs.GPAPUD.bit.GPIO15 = 0; // Enable pull-up on GPIO15 (MFSXB) (Comment as needed)
GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0; // Enable pull-up on GPIO1 (MFSRB) (Comment as needed)
//GpioCtrlRegs.GPBPUD.bit.GPIO61 = 0; // Enable pull-up on GPIO61 (MFSRB) (Comment as needed)
/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 3; // Asynch input GPIO24 (MDXB) (Comment as needed)
//GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 3; // Asynch input GPIO12 (MDXB) (Comment as needed)
GpioCtrlRegs.GPAQSEL2.bit.GPIO25 = 3; // Asynch input GPIO25 (MDRB) (Comment as needed)
//GpioCtrlRegs.GPAQSEL1.bit.GPIO13 = 3; // Asynch input GPIO13 (MDRB) (Comment as needed)
GpioCtrlRegs.GPAQSEL2.bit.GPIO26 = 3; // Asynch input GPIO26(MCLKXB) (Comment as needed)
//GpioCtrlRegs.GPAQSEL1.bit.GPIO14 = 3; // Asynch input GPIO14 (MCLKXB) (Comment as needed)
GpioCtrlRegs.GPAQSEL1.bit.GPIO3 = 3; // Asynch input GPIO3 (MCLKRB) (Comment as needed)
//GpioCtrlRegs.GPBQSEL2.bit.GPIO60 = 3; // Asynch input GPIO60 (MCLKRB) (Comment as needed)
GpioCtrlRegs.GPAQSEL2.bit.GPIO27 = 3; // Asynch input GPIO27 (MFSXB) (Comment as needed)
//GpioCtrlRegs.GPAQSEL1.bit.GPIO15 = 3; // Asynch input GPIO15 (MFSXB) (Comment as needed)
GpioCtrlRegs.GPAQSEL1.bit.GPIO1 = 3; // Asynch input GPIO1 (MFSRB) (Comment as needed)
//GpioCtrlRegs.GPBQSEL2.bit.GPIO61 = 3; // Asynch input GPIO61 (MFSRB) (Comment as needed)
EDIS;
}
#endif // end DSP28_MCBSPB
void delay_loop(void)
{
long i;
for (i = 0; i < MCBSP_INIT_DELAY; i++) {} //delay in McBsp init. must be at least 2 SRG cycles
}
void clkg_delay_loop(void)
{
long i;
for (i = 0; i < MCBSP_CLKG_DELAY; i++) {} //delay in McBsp init. must be at least 2 SRG cycles
}
//===========================================================================
// No more.
//===========================================================================
// TI File $Revision: /main/1 $
// Checkin $Date: August 18, 2006 13:46:27 $
//###########################################################################
//
// FILE: DSP2833x_I2C.c
//
// TITLE: DSP2833x SCI Initialization & Support Functions.
//
//###########################################################################
// $TI Release: DSP2833x Header Files V1.01 $
// $Release Date: September 26, 2007 $
//###########################################################################
#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
//---------------------------------------------------------------------------
// InitI2C:
//---------------------------------------------------------------------------
// This function initializes the I2C to a known state.
//
void InitI2C(void)
{
// Initialize I2C-A:
//tbd...
}
//---------------------------------------------------------------------------
// Example: InitI2CGpio:
//---------------------------------------------------------------------------
// This function initializes GPIO pins to function as I2C pins
//
// Each GPIO pin can be configured as a GPIO pin or up to 3 different
// peripheral functional pins. By default all pins come up as GPIO
// inputs after reset.
//
// Caution:
// Only one GPIO pin should be enabled for SDAA operation.
// Only one GPIO pin shoudl be enabled for SCLA operation.
// Comment out other unwanted lines.
void InitI2CGpio()
{
EALLOW;
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0; // Enable pull-up for GPIO32 (SDAA)
GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0; // Enable pull-up for GPIO33 (SCLA)
/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3; // Asynch input GPIO32 (SDAA)
GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3; // Asynch input GPIO33 (SCLA)
/* Configure SCI pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be I2C functional pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1; // Configure GPIO32 for SDAA operation
GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1; // Configure GPIO33 for SCLA operation
EDIS;
}
//===========================================================================
// End of file.
//===========================================================================
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