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static struct mutex i2cmutex;
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static struct mutex i2cmutex;
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static struct wakeup i2cwakeup;
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static struct wakeup i2cwakeup;
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void i2c_init()
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static void i2c_on()
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{
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{
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    mutex_init(&i2cmutex);
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    wakeup_init(&i2cwakeup);
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    /* enable I2C pins */
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    PCON10 = (2 << 2) |
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             (2 << 0);
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    /* enable I2C clock */
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    /* enable I2C clock */
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    PWRCON(0) &= ~(1 << 5);
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    PWRCON(0) &= ~(1 << 5);
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    /* initial config */
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    IICADD = 0;
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    IICCON = (1 << 7) | /* ACK_GEN */
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    IICCON = (1 << 7) | /* ACK_GEN */
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             (0 << 6) | /* CLKSEL = PCLK/16 */
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             (0 << 6) | /* CLKSEL = PCLK/16 */
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             (1 << 5) | /* INT_EN */
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             (1 << 5) | /* INT_EN */
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             (1 << 4) | /* IRQ clear */
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             (1 << 4) | /* IRQ clear */
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             (7 << 0);  /* CK_REG */
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             (7 << 0);  /* CK_REG */
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    /* serial output on */
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    /* serial output on */
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    IICSTAT = (1 << 4);
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    IICSTAT = (1 << 4);
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}
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static void i2c_off()
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{
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    /* serial output off */
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    IICSTAT = 0;
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    /* disable I2C clock */
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    PWRCON(0) |= (1 << 5);
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}
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void i2c_init()
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{
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    mutex_init(&i2cmutex);
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    wakeup_init(&i2cwakeup);
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    /* enable I2C pins */
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    PCON10 = (2 << 2) |
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             (2 << 0);
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    interrupt_enable(IRQ_IIC, true);
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    interrupt_enable(IRQ_IIC, true);
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}
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}
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void i2c_send(uint32_t bus, uint32_t device, uint32_t address, const uint8_t* data, uint32_t length)
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void i2c_send(uint32_t bus, uint32_t device, uint32_t address, const uint8_t* data, uint32_t length)
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{
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{
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    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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	i2c_on();
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    IICDS = device & ~1;
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    IICDS = device & ~1;
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    IICSTAT = 0xF0;
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    IICSTAT = 0xF0;
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    IICCON = 0xB7;
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    IICCON = 0xB7;
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    wakeup_wait(&i2cwakeup, TIMEOUT_BLOCK);
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    wakeup_wait(&i2cwakeup, TIMEOUT_BLOCK);
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    if (address >= 0)
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    if (address >= 0)
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    }
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    }
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    /* STOP */
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    /* STOP */
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    IICSTAT = 0xD0;
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    IICSTAT = 0xD0;
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    IICCON = 0xB7;
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    IICCON = 0xB7;
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    while ((IICSTAT & (1 << 5)) != 0) yield();
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    while ((IICSTAT & (1 << 5)) != 0) yield();
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	i2c_off();
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    mutex_unlock(&i2cmutex);
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    mutex_unlock(&i2cmutex);
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}
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}
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void i2c_recv(uint32_t bus, uint32_t device, uint32_t address, uint8_t* data, uint32_t length)
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void i2c_recv(uint32_t bus, uint32_t device, uint32_t address, uint8_t* data, uint32_t length)
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{
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{
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    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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	i2c_on();
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    if (address >= 0)
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    if (address >= 0)
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    {
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    {
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        /* START */
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        /* START */
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        IICDS = device & ~1;
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        IICDS = device & ~1;
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        IICSTAT = 0xF0;
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        IICSTAT = 0xF0;
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    }
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    }
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    /* STOP */
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    /* STOP */
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    IICSTAT = 0x90;
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    IICSTAT = 0x90;
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    IICCON = 0xB7;
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    IICCON = 0xB7;
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    while ((IICSTAT & (1 << 5)) != 0) yield();
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    while ((IICSTAT & (1 << 5)) != 0) yield();
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	i2c_off();
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    mutex_unlock(&i2cmutex);
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    mutex_unlock(&i2cmutex);
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}
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}
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void i2c_sendbyte(uint32_t bus, uint32_t device, uint32_t address, uint32_t data)
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void i2c_sendbyte(uint32_t bus, uint32_t device, uint32_t address, uint32_t data)
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{
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{