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以下是使用IO模拟SWD协议，读写cortex M0+ 的寄存器源码，实测可用！

移植时，实现IO操作的几个宏就能工作了！

//==============================================================================

//SWDIO = PA1

#define SWDIO_SetHigh() ( M0P_GPIOA->BSRR = 1<<1 )

#define SWDIO_SetLow() ( M0P_GPIOA->BRR = 1<<1 )

#define SWDIO_SetInput() ( M0P_GPIOA->DIR_f.PIN1 = 1 )

#define SWDIO_SetOutput() ( M0P_GPIOA->DIR_f.PIN1 = 0 )

#define SWDIO_GetValue() ( M0P_GPIOA->IN & (1<<1) )

//SWCLK = PA2

#define SWCLK_SetHigh() ( M0P_GPIOA->BSRR = 1<<2 )

#define SWCLK_SetLow() ( M0P_GPIOA->BRR = 1<<2 )

#define SWCLK_SetOutput() ( M0P_GPIOA->DIR_f.PIN2 = 0 )

//==============================================================================

#define SwdDly() __nop();__nop();

//==============================================================================

int main(void)

{

__IO uint8_t tmp8;

__IO uint32_t tmp32;

M0P_SYSCTRL->PERICLKEN0 = 0xffffffff;

M0P_SYSCTRL->PERICLKEN1 = 0xffffffff;

M0P_GPIOA->ADS = 0x00;

Swd_Bus_Reset();

while( 1 )

{

// Swd_Bus_Reset();

//

// Swd_Bus_SendByte( 0x9E );

// Swd_Bus_SendByte( 0xE7 );

// Swd_Bus_SendByte( 0x00 );

// Swd_Bus_SendByte( 0x00 );

//

Swd_Bus_Reset();

Swd_Bus_SendByte( 0x00 );

//--------------------------------------------------

//Read DP.IDR

Swd_Bus_SendByte( 0xa5 );

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity();

Swd_Bus_Turn();

Swd_Bus_SendByte( 0x00 );

//--------------------------------------------------

//write ctrl/state

Swd_Bus_SendByte( 0xa9 );

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0x50000000 );

Swd_Bus_SendByte( 0x00 );

//--------------------------------------------------

//Read AP.IDR

Swd_Bus_SendByte( 0xb1 ); //write select AP BANK - 0F

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0x000000f0 );

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0x9f ); //read DRW dummy

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity();

Swd_Bus_Turn();

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0xbd ); //read rdbuf

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity();

Swd_Bus_Turn();

Swd_Bus_SendByte( 0x00 );

//--------------------------------------------------

//SET AP 位宽为32位

Swd_Bus_SendByte( 0xb1 ); //write select AP BANK - 00

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0x00000000 );

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0xA3 ); //write CSW -

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0x23000002 ); //32bit 位宽，地址不自动增加

Swd_Bus_SendByte( 0x00 );

//--------------------------------------------------

//stop the cpu

Swd_Bus_SendByte( 0x8B ); //write TAR

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0xE000EDF0 ); //

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0xBB ); //WRITE DRW

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0xA05F0303 );

Swd_Bus_SendByte( 0x00 );

//--------------------------------------------------

//Read User Memery

Swd_Bus_SendByte( 0x8B ); //write TAR

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0x00100d90 );

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0x9f ); //read DRW

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity(); //dummy

Swd_Bus_Turn();

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0xbd ); //read rdbuf

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity(); //read

Swd_Bus_Turn();

Swd_Bus_SendByte( 0x00 );

//--------------------------------

//write and read reg

Swd_Bus_SendByte( 0x8B ); //write TAR

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0x40020F04 );

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0xBB ); //WRITE DRW

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

Swd_Bus_Turn();

Swd_Bus_SendWordAndParity( 0xffffffff );

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0x9f ); //read DRW dummy

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity();

Swd_Bus_Turn();

Swd_Bus_SendByte( 0x00 );

Swd_Bus_SendByte( 0xbd ); //read rdbuf

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity();

Swd_Bus_Turn();

Swd_Bus_SendByte( 0x00 );

while( 1 );

}

}

//==============================================================================

void Swd_Bus_Reset( void )

{

uint8_t i;

SWCLK_SetOutput();

SWDIO_SetOutput();

SWDIO_SetHigh();

SWCLK_SetLow();

for( i=0; i<56; i++ )

{

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

SwdDly();

}

}

void Swd_Bus_Turn( void )

{

SWDIO_SetInput();

SwdDly();

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

SwdDly();

}

//LSB FIRST

void Swd_Bus_SendByte( uint8_t Va )

{

uint8_t i;

SWDIO_SetLow();

SWDIO_SetOutput();

for( i=0; i<8; i++ )

{

if( Va & 0x01 )

{

SWDIO_SetHigh();

}

else

{

SWDIO_SetLow();

}

Va >>= 1;

SwdDly();

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

}

SwdDly();

}

//LSB FIRST

void Swd_Bus_SendWordAndParity( uint32_t Va )

{

uint8_t i;

uint8_t Pa = 0x00;

SWDIO_SetLow();

SWDIO_SetOutput();

for( i=0; i<32; i++ )

{

if( Va & 0x01 )

{

SWDIO_SetHigh();

Pa++;

}

else

{

SWDIO_SetLow();

}

Va >>= 1;

SwdDly();

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

}

//send Parity

if( Pa & 0x01 )

{

SWDIO_SetHigh();

}

else

{

SWDIO_SetLow();

}

SwdDly();

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

SwdDly();

}

//LSB FIRST

uint32_t Swd_Bus_RecvWordAndParity( void )

{

uint8_t i;

uint32_t tmp32;

tmp32 = 0x00;

SWDIO_SetInput();

SwdDly();

for( i=0; i<32; i++ )

{

if( SWDIO_GetValue() )

{

tmp32 >>= 1;

tmp32 |= bv31;

}

else

{

tmp32 >>= 1;

}

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

SwdDly();

}

//------------------------------

//Parity

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

SwdDly();

return( tmp32 );

}

//LSB FIRST

uint8_t Swd_Bus_RecvAck( void )

{

uint8_t i;

uint8_t tmp8;

tmp8 = 0x00;

SWDIO_SetInput();

SwdDly();

for( i=0; i<3; i++ )

{

if( SWDIO_GetValue() )

{

tmp8 >>= 1;

tmp8 |= bv2;

}

else

{

tmp8 >>= 1;

}

SWCLK_SetHigh();

SwdDly();

SWCLK_SetLow();

SwdDly();

}

return( tmp8 );

}