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SWD协议源码入门示例

SWD协议源码⼊门⽰例

通过IO模拟SWD协议，实现读写cortex M0+ 的寄存器源码。

⾃⼰从0开始撸出来的，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_Reset();

Swd_Bus_SendByte( 0x00 );

椰油酸

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

//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 );

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

制作音箱/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 @ 0x00100d90

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北斗导航认证启动

Swd_Bus_Turn();

tmp8 = Swd_Bus_RecvAck();

tmp32 = Swd_Bus_RecvWordAndParity(); //read

Swd_Bus_Turn();

雨棚制作

Swd_Bus_SendByte( 0x00 );

//--------------------------------B的立体图

//write and read reg @ 0x40020F04

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();

sero-0151Swd_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 );

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