diff options
| author | Perry Hung <iperry@gmail.com> | 2011-03-14 18:37:56 -0400 |
|---|---|---|
| committer | Perry Hung <iperry@gmail.com> | 2011-03-14 22:52:06 -0400 |
| commit | 334de50c49317f281d87f44e7b9278e08af19254 (patch) | |
| tree | 2aa29c4f6aecb60c2f4ce5964d876745b1757d60 /libmaple/i2c.h | |
| parent | 9872b3975bd40c55652bb9dead5f54e2be9740d0 (diff) | |
| download | librambutan-334de50c49317f281d87f44e7b9278e08af19254.tar.gz librambutan-334de50c49317f281d87f44e7b9278e08af19254.zip | |
Add rudimentary error handling for nack condition
Diffstat (limited to 'libmaple/i2c.h')
| -rw-r--r-- | libmaple/i2c.h | 43 |
1 files changed, 32 insertions, 11 deletions
diff --git a/libmaple/i2c.h b/libmaple/i2c.h index be05615..a9e2c7b 100644 --- a/libmaple/i2c.h +++ b/libmaple/i2c.h @@ -136,17 +136,13 @@ extern "C" { void i2c_master_enable(i2c_dev *dev, uint32 flags); int32 i2c_master_xfer(i2c_dev *dev, i2c_msg *msgs, uint16 num); -static inline void i2c_write(i2c_dev *dev, uint8 byte) { - dev->regs->DR = byte; -} - /* * Low level register twiddling functions */ /** * @brief turn on an i2c peripheral - * @param map i2c peripheral register base + * @param dev i2c device */ static inline void i2c_peripheral_enable(i2c_dev *dev) { dev->regs->CR1 |= I2C_CR1_PE; @@ -154,15 +150,25 @@ static inline void i2c_peripheral_enable(i2c_dev *dev) { /** * @brief turn off an i2c peripheral - * @param map i2c peripheral register base + * @param dev i2c device */ static inline void i2c_peripheral_disable(i2c_dev *dev) { dev->regs->CR1 &= ~I2C_CR1_PE; } /** + * @brief Fill transmit register + * @param dev i2c device + * @param byte byte to write + */ +static inline void i2c_write(i2c_dev *dev, uint8 byte) { + dev->regs->DR = byte; +} + + +/** * @brief Set input clock frequency, in mhz - * @param device to configure + * @param dev i2c * @param freq frequency in megahertz (2-36) */ static inline void i2c_set_input_clk(i2c_dev *dev, uint32 freq) { @@ -172,6 +178,13 @@ static inline void i2c_set_input_clk(i2c_dev *dev, uint32 freq) { dev->regs->CR2 = freq; } + +/** + * @brief Set i2c clock control register. See RM008 + * @param dev i2c device + * @return + * @sideeffect + */ static inline void i2c_set_clk_control(i2c_dev *dev, uint32 val) { uint32 ccr = dev->regs->CCR; ccr &= ~I2C_CCR_CCR; @@ -195,15 +208,23 @@ static inline void i2c_set_trise(i2c_dev *dev, uint32 trise) { dev->regs->TRISE = trise; } -extern void toggle(void); static inline void i2c_start_condition(i2c_dev *dev) { - uint32 cr1 = dev->regs->CR1; -// if (cr1 & (I2C_CR1_START | I2C_CR1_STOP | I2C_CR1_PEC)) { -// } + uint32 cr1; + while ((cr1 = dev->regs->CR1) & (I2C_CR1_START | + I2C_CR1_STOP | + I2C_CR1_PEC)) { + ; + } dev->regs->CR1 |= I2C_CR1_START; } static inline void i2c_stop_condition(i2c_dev *dev) { + uint32 cr1; + while ((cr1 = dev->regs->CR1) & (I2C_CR1_START | + I2C_CR1_STOP | + I2C_CR1_PEC)) { + ; + } dev->regs->CR1 |= I2C_CR1_STOP; } |