void i2c_master_enable(i2c_dev *dev, uint32 flags) {
/* Bring the peripheral down for configuration */
i2c_peripheral_disable(dev);
/* Reset the bus when requested so */
if (flags & I2C_BUS_RESET)
i2c_bus_reset(dev);
/* Turn on the clock and set GPIO modes */
i2c_init(dev);
i2c_config_gpios(dev);
/* Configure analog and digital filters */
/* TODO ANFOFF, DNF */
/* Configure the clock and rise time */
dev->regs->TIMINGR = I2C_TIMING_10_kHz;
/* Configure NOSTRETCH behaviour */
/* TODO NOSTRETCH */
/* Enable all interrupts */ /* FIXME not yet used on F3 */
//nvic_irq_enable(dev->ev_nvic_line);
//nvic_irq_enable(dev->er_nvic_line);
//i2c_enable_irq(dev, 0xFE); /* All interrupts */
/* Make it go! */
i2c_peripheral_enable(dev);
dev->state = I2C_STATE_IDLE;
}
/**
* @brief Initialize an I2C device as bus master
* @param dev Device to enable
* @param flags Bitwise or of the following I2C options:
* I2C_FAST_MODE: 400 khz operation,
* I2C_DUTY_16_9: 16/9 Tlow/Thigh duty cycle (only applicable for
* fast mode),
* I2C_BUS_RESET: Reset the bus and clock out any hung slaves on
* initialization,
* I2C_10BIT_ADDRESSING: Enable 10-bit addressing,
* I2C_REMAP: (deprecated, STM32F1 only) Remap I2C1 to SCL/PB8
* SDA/PB9.
*/
void i2c_master_enable(i2c_dev *dev, uint32 flags) {
/* Reset the bus. Clock out any hung slaves. */
if (flags & I2C_BUS_RESET) {
fooprint("i2c_master_enable: calling i2c_bus_reset");
i2c_bus_reset(dev);
}
fooprint("i2c_master_enable: entry");
/* PE must be disabled to configure the device */
// ASSERT(!(dev->regs->CR1 & I2C_CR1_PE));
/* Ugh */
//_i2c_handle_remap(dev, flags);
fooprint("i2c_master_enable: calling i2c_init");
/* Turn on clock and set GPIO modes */
i2c_init(dev);
fooprint("i2c_master_enable: calling i2c_config_gpios");
i2c_config_gpios(dev);
fooprint("i2c_master_enable: calling set_freq_scl");
/* Configure clock and rise time */
set_freq_scl(dev, flags);
fooprint("i2c_master_enable: calling nvic_irq_enable(ev)");
/* Enable event and buffer interrupts */
nvic_irq_enable(dev->ev_nvic_line);
fooprint("i2c_master_enable: calling nvic_irq_enable(er)");
nvic_irq_enable(dev->er_nvic_line);
//gutted
fooprint("i2c_master_enable: calling i2c_enable_irq");
i2c_enable_irq(dev, I2C_CFGR_STOIEN_MASK | I2C_CFGR_ACKIEN_MASK | I2C_CFGR_RXIEN_MASK | I2C_CFGR_TXIEN_MASK | I2C_CFGR_STAIEN_MASK | I2C_CFGR_ARBLIEN_MASK);
/* Make it go! */
fooprint("i2c_master_enable: calling i2c_peripheral_enable");
//gutted
i2c_peripheral_enable(dev);
dev->state = I2C_STATE_IDLE;
fooprint("i2c_master_enable: exit, dev-state = I2C_STATE_IDLE");
}
/**
* @brief Initialize an I2C device as bus master
* @param dev Device to enable
* @param flags Bitwise or of the following I2C options:
* I2C_FAST_MODE: 400 khz operation,
* I2C_DUTY_16_9: 16/9 Tlow/Thigh duty cycle (only applicable for
* fast mode),
* I2C_BUS_RESET: Reset the bus and clock out any hung slaves on
* initialization,
* I2C_10BIT_ADDRESSING: Enable 10-bit addressing,
* I2C_REMAP: (deprecated, STM32F1 only) Remap I2C1 to SCL/PB8
* SDA/PB9.
*/
void i2c_master_enable(i2c_dev *dev, uint32 flags) {
/* PE must be disabled to configure the device */
ASSERT(!(dev->regs->CR1 & I2C_CR1_PE));
/* Ugh */
_i2c_handle_remap(dev, flags);
/* Reset the bus. Clock out any hung slaves. */
if (flags & I2C_BUS_RESET) {
i2c_bus_reset(dev);
}
/* Turn on clock and set GPIO modes */
i2c_init(dev);
i2c_config_gpios(dev);
/* Configure clock and rise time */
set_ccr_trise(dev, flags);
/* Enable event and buffer interrupts */
nvic_irq_enable(dev->ev_nvic_line);
nvic_irq_enable(dev->er_nvic_line);
i2c_enable_irq(dev, I2C_IRQ_EVENT | I2C_IRQ_BUFFER | I2C_IRQ_ERROR);
/* Configure the slave unit */
if (flags & I2C_SLAVE_DUAL_ADDRESS) {
i2c_slave_dual_address_enable(dev);
}
if (flags & I2C_SLAVE_GENERAL_CALL) {
i2c_slave_general_call_enable(dev);
}
/* store all of the flags */
dev->config_flags = flags;
/* Make it go! */
i2c_peripheral_enable(dev);
i2c_enable_ack(dev);
dev->state = I2C_STATE_IDLE;
}
void i2c_master_release_bus(const i2c_dev *dev) {
gpio_write_bit(scl_port(dev), dev->scl_pin, 1); /* TODO check this */
gpio_write_bit(sda_port(dev), dev->sda_pin, 1);
i2c_config_gpios(dev);
}
