mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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364 lines
No EOL
7.2 KiB
C
364 lines
No EOL
7.2 KiB
C
//-----------------------------------------------------------------------------
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// Willok, June 2018
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// Edits by Iceman, July 2018
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// The main i2c code, for communications with smart card module
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//-----------------------------------------------------------------------------
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#include "i2c.h"
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// 定义连接引脚
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#define GPIO_RST AT91C_PIO_PA1
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#define GPIO_SCL AT91C_PIO_PA5
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#define GPIO_SDA AT91C_PIO_PA7
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#define SCL_H HIGH(GPIO_SCL)
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#define SCL_L LOW(GPIO_SCL)
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#define SDA_H HIGH(GPIO_SDA)
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#define SDA_L LOW(GPIO_SDA)
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#define SCL_read (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SCL)
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#define SDA_read (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SDA)
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#define I2C_PageSize 8
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// 直接使用循环来延时，一个循环 6 条指令，48M， Delay=1 大概为 200kbps
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void I2CSpinDelayClk(uint16_t delay) __attribute__((optimize("O0")));
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void I2CSpinDelayClk(uint16_t delay) {
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volatile uint32_t c;
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for (c = delay * 2; c; c--) {};
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}
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void I2C_init(void) {
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// 配置复位引脚，关闭上拉，推挽输出，默认高
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// Configure reset pin, close up pull up, push-pull output, default high
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AT91C_BASE_PIOA->PIO_PPUDR = GPIO_RST;
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AT91C_BASE_PIOA->PIO_MDDR = GPIO_RST;
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// 配置 I2C 引脚，开启上拉，开漏输出
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// Configure I2C pin, open up, open leakage
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AT91C_BASE_PIOA->PIO_PPUER = GPIO_SCL | GPIO_SDA; // 打开上拉 Open up the pull up
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AT91C_BASE_PIOA->PIO_MDER = GPIO_SCL | GPIO_SDA;
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// 默认三根线全部拉高
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// default three lines all pull up
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AT91C_BASE_PIOA->PIO_SODR = GPIO_SCL | GPIO_SDA | GPIO_RST;
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// 允许输出
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// allow output
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AT91C_BASE_PIOA->PIO_OER = GPIO_SCL | GPIO_SDA | GPIO_RST;
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AT91C_BASE_PIOA->PIO_PER = GPIO_SCL | GPIO_SDA | GPIO_RST;
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}
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#define I2C_DELAY_1CLK I2CSpinDelayClk(1)
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#define I2C_DELAY_2CLK I2CSpinDelayClk(2)
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#define I2C_DELAY_XCLK(x) I2CSpinDelayClk((x))
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// 设置复位状态
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// set the reset state
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void I2C_SetResetStatus(uint8_t LineRST, uint8_t LineSCK, uint8_t LineSDA) {
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if (LineRST)
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HIGH(GPIO_RST);
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else
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LOW(GPIO_RST);
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if (LineSCK)
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HIGH(GPIO_SCL);
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else
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LOW(GPIO_SCL);
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if (LineSDA)
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HIGH(GPIO_SDA);
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else
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LOW(GPIO_SDA);
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}
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// 复位进入主程序
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// Reset the SIM_Adapter, then enter the main program
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// Note: the SIM_Adapter will not enter the main program after power up. Please run this function before use SIM_Adapter.
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void I2C_Reset_EnterMainProgram(void) {
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I2C_SetResetStatus(0, 0, 0); // 拉低复位线
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SpinDelay(100);
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I2C_SetResetStatus(1, 0, 0); // 解除复位
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SpinDelay(100);
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I2C_SetResetStatus(1, 1, 1); // 拉高数据线
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}
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// 复位进入引导模式
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// Reset the SIM_Adapter, then enter the bootloader program
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// Reserve：For firmware update.
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void I2C_Reset_EnterBootloader(void) {
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I2C_SetResetStatus(0, 1, 1); // 拉低复位线
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SpinDelay(100);
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I2C_SetResetStatus(1, 1, 1); // 解除复位
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}
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// 等待时钟变高
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// Wait for the clock to go High.
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bool WaitSCL_H(void) {
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volatile uint16_t count = 5000;
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while (count--) {
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if (SCL_read) {
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return true;
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}
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I2C_DELAY_1CLK;
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}
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return false;
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}
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bool I2C_Start(void) {
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I2C_DELAY_XCLK(4);
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SDA_H;
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I2C_DELAY_1CLK;
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SCL_H;
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if (!WaitSCL_H()) return false;
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I2C_DELAY_2CLK;
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if (!SCL_read) return false;
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if (!SDA_read) return false;
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SDA_L; I2C_DELAY_2CLK;
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return true;
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}
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// send i2c STOP
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void I2C_Stop(void) {
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SCL_L; I2C_DELAY_2CLK;
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SDA_L; I2C_DELAY_2CLK;
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SCL_H; I2C_DELAY_2CLK;
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SDA_H;
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I2C_DELAY_2CLK;
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I2C_DELAY_2CLK;
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I2C_DELAY_2CLK;
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I2C_DELAY_2CLK;
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}
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// Send i2c ACK
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void I2C_Ack(void) {
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SCL_L; I2C_DELAY_2CLK;
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SDA_L; I2C_DELAY_2CLK;
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SCL_H; I2C_DELAY_2CLK;
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SCL_L; I2C_DELAY_2CLK;
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}
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// Send i2c NACK
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void I2C_NoAck(void) {
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SCL_L; I2C_DELAY_2CLK;
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SDA_H; I2C_DELAY_2CLK;
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SCL_H; I2C_DELAY_2CLK;
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SCL_L; I2C_DELAY_2CLK;
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}
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bool I2C_WaitAck(void) {
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SCL_L; I2C_DELAY_1CLK;
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SDA_H; I2C_DELAY_1CLK;
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SCL_H;
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if (!WaitSCL_H())
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return false;
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I2C_DELAY_2CLK;
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if (SDA_read) {
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SCL_L;
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return false;
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}
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SCL_L;
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return true;
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}
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void I2C_SendByte(uint8_t data) {
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uint8_t i = 8;
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while (i--) {
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SCL_L; I2C_DELAY_1CLK;
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if (data & 0x80)
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SDA_H;
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else
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SDA_L;
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data <<= 1;
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I2C_DELAY_1CLK;
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SCL_H;
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if (!WaitSCL_H())
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return;
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I2C_DELAY_2CLK;
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}
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SCL_L;
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}
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uint8_t I2C_ReceiveByte(void) {
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uint8_t i = 8, b = 0;
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SDA_H;
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while (i--) {
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b <<= 1;
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SCL_L; I2C_DELAY_2CLK;
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SCL_H;
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if (!WaitSCL_H())
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return 0;
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I2C_DELAY_2CLK;
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if (SDA_read)
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b |= 0x01;
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}
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SCL_L;
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return b;
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}
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// 写入1字节数据 （待写入数据，待写入地址，器件类型）
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// Writes 1 byte data (Data to be written,command to be written , SlaveDevice address ).
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bool I2C_WriteByte(uint8_t data, uint8_t device_cmd, uint8_t device_address) {
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bool bBreak = true;
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do {
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if (!I2C_Start())
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return false;
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I2C_SendByte(device_address & 0xFE);
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if (!I2C_WaitAck())
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break;
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I2C_SendByte(device_cmd);
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if (!I2C_WaitAck())
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break;
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I2C_SendByte(data);
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if (!I2C_WaitAck())
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break;
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bBreak = false;
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} while (false);
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if (bBreak) {
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I2C_Stop();
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DbpString("I2C_WaitAck Error\n");
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return false;
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}
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I2C_Stop();
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return true;
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}
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// 写入1串数据（待写入数组地址，待写入长度，待写入地址，器件类型）
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// Write 1 strings of data (Array address, length, command to be written , SlaveDevice address ).
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// len = uint8 (max buffer to write 256bytes)
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bool I2C_BufferWrite(uint8_t *data, uint8_t len, uint8_t device_cmd, uint8_t device_address) {
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bool bBreak = true;
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do {
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if (!I2C_Start())
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return false;
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I2C_SendByte(device_address & 0xFE);
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if (!I2C_WaitAck())
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break;
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I2C_SendByte(device_cmd);
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if (!I2C_WaitAck())
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break;
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while (len) {
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I2C_SendByte(*data);
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if (!I2C_WaitAck())
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break;
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len--;
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data++;
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}
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if (len == 0)
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bBreak = false;
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} while (false);
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if (bBreak) {
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I2C_Stop();
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DbpString("I2C_WaitAck Error\n");
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return false;
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}
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I2C_Stop();
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return true;
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}
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// 读出1串数据（存放读出数据，待读出长度，带读出地址，器件类型）
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// read 1 strings of data (Data storage array, Readout length, command to be written , SlaveDevice address ).
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// len = uint8 (max buffer to read 256bytes)
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uint8_t I2C_BufferRead(uint8_t *data, uint8_t len, uint8_t device_cmd, uint8_t device_address) {
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bool bBreak = true;
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uint8_t readcount = 0;
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// sending
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do {
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if (!I2C_Start())
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return 0;
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I2C_SendByte(device_address & 0xFE);
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if (!I2C_WaitAck())
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break;
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I2C_SendByte(device_cmd);
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if (!I2C_WaitAck())
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break;
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I2C_Start();
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I2C_SendByte(device_address | 1);
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if (!I2C_WaitAck())
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break;
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bBreak = false;
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} while (false);
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if (bBreak) {
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I2C_Stop();
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DbpString("I2C_WaitAck Error\n");
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return 0;
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}
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// reading
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while (len) {
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len--;
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*data = I2C_ReceiveByte();
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// 读取的第一个字节为后续长度
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// The first byte read is the message length
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if (!readcount && (len > *data))
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len = *data;
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if (len == 0)
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I2C_NoAck();
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else
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I2C_Ack();
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data++;
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readcount++;
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}
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I2C_Stop();
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return readcount;
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}
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void i2c_print_status(void) {
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DbpString("Smart card module (ISO 7816)");
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I2C_init();
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I2C_Reset_EnterMainProgram();
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// get version
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uint8_t resp[3] = {0};
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uint8_t len = I2C_BufferRead(resp, 3, I2C_DEVICE_CMD_GETVERSION, I2C_DEVICE_ADDRESS_MAIN);
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if ( len == 3)
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Dbprintf(" FW version................v%x.%02x", resp[1], resp[2]);
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} |