diff options
Diffstat (limited to 'libmaple')
| -rw-r--r-- | libmaple/include/libmaple/i2c.h | 144 |
1 files changed, 73 insertions, 71 deletions
diff --git a/libmaple/include/libmaple/i2c.h b/libmaple/include/libmaple/i2c.h index ccce139..8ea77d7 100644 --- a/libmaple/include/libmaple/i2c.h +++ b/libmaple/include/libmaple/i2c.h @@ -165,8 +165,6 @@ typedef struct i2c_msg { * Convenience routines */ -void i2c_init(i2c_dev *dev); - /* I2C enable options */ #define I2C_FAST_MODE 0x1 // 400 khz #define I2C_DUTY_16_9 0x2 // 16/9 duty ratio @@ -193,75 +191,6 @@ static inline void i2c_disable(i2c_dev *dev) { dev->state = I2C_STATE_DISABLED; } -/** - * @brief Turn on an I2C peripheral - * @param dev Device to enable - */ -static inline void i2c_peripheral_enable(i2c_dev *dev) { - dev->regs->CR1 |= I2C_CR1_PE; -} - -/** - * @brief Turn off an I2C peripheral - * @param dev Device to turn off - */ -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 dev I2C device - * @param freq Frequency, in MHz. This must be at least 2, and at most - * the APB frequency of dev's bus. (For example, if - * rcc_dev_clk(dev) == RCC_APB1, freq must be at most - * PCLK1, in MHz). There is an additional limit of 46 MHz. - */ -static inline void i2c_set_input_clk(i2c_dev *dev, uint32 freq) { -#define I2C_MAX_FREQ_MHZ 46 - ASSERT(2 <= freq && freq <= _i2c_bus_clk(dev) && freq <= I2C_MAX_FREQ_MHZ); - uint32 cr2 = dev->regs->CR2; - cr2 &= ~I2C_CR2_FREQ; - cr2 |= freq; - dev->regs->CR2 = freq; -#undef I2C_MAX_FREQ_MHZ -} - -/** - * @brief Set I2C clock control register. - * - * See the chip reference manual for the details. - * - * @param dev I2C device - * @param val Value to use for clock control register (in - * Fast/Standard mode) - */ -static inline void i2c_set_clk_control(i2c_dev *dev, uint32 val) { - uint32 ccr = dev->regs->CCR; - ccr &= ~I2C_CCR_CCR; - ccr |= val; - dev->regs->CCR = ccr; -} - -/** - * @brief Set SCL rise time - * @param dev I2C device - * @param trise Maximum rise time in fast/standard mode (see chip - * reference manual for the relevant formulas). - */ -static inline void i2c_set_trise(i2c_dev *dev, uint32 trise) { - dev->regs->TRISE = trise; -} - /* Start/stop conditions */ /** @@ -345,6 +274,79 @@ static inline void i2c_disable_ack(i2c_dev *dev) { dev->regs->CR1 &= ~I2C_CR1_ACK; } +/* Miscellaneous low-level routines */ + +void i2c_init(i2c_dev *dev); + +/** + * @brief Turn on an I2C peripheral + * @param dev Device to enable + */ +static inline void i2c_peripheral_enable(i2c_dev *dev) { + dev->regs->CR1 |= I2C_CR1_PE; +} + +/** + * @brief Turn off an I2C peripheral + * @param dev Device to turn off + */ +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 dev I2C device + * @param freq Frequency, in MHz. This must be at least 2, and at most + * the APB frequency of dev's bus. (For example, if + * rcc_dev_clk(dev) == RCC_APB1, freq must be at most + * PCLK1, in MHz). There is an additional limit of 46 MHz. + */ +static inline void i2c_set_input_clk(i2c_dev *dev, uint32 freq) { +#define I2C_MAX_FREQ_MHZ 46 + ASSERT(2 <= freq && freq <= _i2c_bus_clk(dev) && freq <= I2C_MAX_FREQ_MHZ); + uint32 cr2 = dev->regs->CR2; + cr2 &= ~I2C_CR2_FREQ; + cr2 |= freq; + dev->regs->CR2 = freq; +#undef I2C_MAX_FREQ_MHZ +} + +/** + * @brief Set I2C clock control register. + * + * See the chip reference manual for the details. + * + * @param dev I2C device + * @param val Value to use for clock control register (in + * Fast/Standard mode) + */ +static inline void i2c_set_clk_control(i2c_dev *dev, uint32 val) { + uint32 ccr = dev->regs->CCR; + ccr &= ~I2C_CCR_CCR; + ccr |= val; + dev->regs->CCR = ccr; +} + +/** + * @brief Set SCL rise time + * @param dev I2C device + * @param trise Maximum rise time in fast/standard mode (see chip + * reference manual for the relevant formulas). + */ +static inline void i2c_set_trise(i2c_dev *dev, uint32 trise) { + dev->regs->TRISE = trise; +} + #ifdef __cplusplus } #endif |