青青av-亚洲激情一区二区-欧洲色综合-看片网址国产福利av中文字幕-成人精品毛片-亚洲黄色免费观看-国产夫妻在线观看-69av电影-久久性片-中文字幕av影片-色综合久久久久无码专区

串行外設接口?(SPI) 允許在板級連接設備。μVision 調試器在主從模式下模擬多個微控制器的SPI接口。

虛擬仿真寄存器?(VTREG)

以下?VTREG 用于模擬 SPI 通信：

SPIx 的 VTREG 命名約定因器件而異。一些設備提供了不止一個 SPI 接口。因此，VTREG 名稱可能以 SPI0 或 SPI1 為前綴。使用命令 DIR VTREG檢查 SPI 接口的虛擬仿真寄存器名稱。

SPI仿真示例

以下腳本定義了調試器信號函數，這些函數使用帶有switch語句的簡單狀態機模擬 Atmel AT250X0 SPI 存儲設備。

/* Define the state and address for the AT250x0.*/

define char spi_at250x0_state

define int ?spi_at250x0_address

define char spi_at250x0_status

/* MAP the memory area to use for the SPI RAM. */

map X:0x700000,X:0x70FFFF READ WRITE

/*-----------------------------------------------

This function implements the state matching for

the AT250x0.

State ??????Transition

-------------------------------------------------

0: WREN ?-> 0

0: WRDI ?-> 0

0: RDSR ?-> 0

0: Read ?-> 1: Get Address LSB -> 2: Read Byte <-

0: Write -> 3: Get Address LSB -> 4: Write Byte -> 5 <-

1: Get Addr LSB -> 2

2: Read Byte(s) -> 2

3: Get Addr LSB -> 4

4: Write Byte ??-> 5

-----------------------------------------------*/

func char spi_at250x0 (char st) {

??unsigned char opcode;

??printf ("AT250X0: STATE %un", (unsigned) st);

??switch (st) ?{

????case 0: ?/* Get OPCode */

??????opcode = SPI_OUT & 0x0007;

??????printf ("AT250X0: OPCODE %un", (unsigned) opcode);

????switch (opcode)

??????{

??????case 1: /* WRSR */

????????return (0);

??????case 2: /* Write */

????????printf ("AT250X0: WRITE OPCODE Detectedn");

????????spi_at250x0_address = (SPI_OUT & 0x08) << 5;

????????return (3);

??????case 3: /* Read */

????????printf ("AT250X0: READ OPCODE Detectedn");

????????spi_at250x0_address = (SPI_OUT & 0x08) << 5;

????????return (1);

??????case 4: /* WRDI */

????????spi_at250x0_status &= ~0x02; /* Clear Write Enable Bit */

????????return (0);

??????case 5: /* RDSR */

????????SPI_IN = spi_at250x0_status;

????????return (5);

??????case 6: /* WREN */

????????spi_at250x0_status |= 0x02; /* Set Write Enable Bit */

????????return (0);

??????}

????return (0);

??case 1: ?/* Get Address LSB for READ */

????spi_at250x0_address |= (SPI_OUT & 0xFF);

????printf ("AT250X0: Address %4.4X Detectedn", spi_at250x0_address);

????return (2);

??case 2: ?/* Read */

????printf ("AT250X0: Read %2.2X from address %4.4Xn", 'A', spi_at250x0_address);

????SPI_IN = _rbyte(X:0x700000 + spi_at250x0_address);

????spi_at250x0_address = (spi_at250x0_address + 1) % 512;

????return (2);

??case 3: ?/* Get Address LSB for WRITE */

????spi_at250x0_address |= (SPI_OUT & 0xFF);

????printf ("AT250X0: Address %4.4X Detectedn", spi_at250x0_address);

????return (4);

??case 4: ?/* Write */

????if (spi_at250x0_status & 0x02)

??????{

??????printf ("AT250X0: Write %2.2X to address %4.4Xn", SPI_OUT, spi_at250x0_address);

??????_wbyte(X:0x700000 + spi_at250x0_address, SPI_OUT);

??????spi_at250x0_status |= 0x01;

??????}

????return (5);

??case 5: ?/* Instruction End */

????return (5);

??}

return (0);

}

/*

?* This signal function watches the AT89S8252 SPI port for writes. ?If there

?* is an SPI port output and if P1.0 is LO (AT250X0 chip select) then interpret

?* the SPI output data and run the state machine.

?*/

signal void spi_watcher (void) {

spi_at250x0_state = 0;

while (1) {

??wwatch (SPI_OUT);

??printf ("SPI_OUT Detectedn");

??if ((PORT1 & 0x01) == 0)

????{

????printf ("Calling AT250X0 Routinesn");

????spi_at250x0_state = spi_at250x0 (spi_at250x0_state);

????if (spi_at250x0_status & 0x01)

??????swatch (0.000100);

??????spi_at250x0_status &= ~0x01;

????}

??else

????{

????printf ("Resetting AT250X0 Routinesn");

????spi_at250x0_state = 0;

????}

??}

}

/*-----------------------------------------------

Enable the signal function for SPI writes.

-----------------------------------------------*/

spi_watcher ();