コード例 #1
0
ファイル: i2c-stm32f0.c プロジェクト: Basavaraja-MS/ec_local
static void i2c_init(void)
{
	const struct i2c_port_t *p = i2c_ports;
	int i;

	for (i = 0; i < i2c_ports_used; i++, p++)
		i2c_init_port(p);

#ifdef CONFIG_HOSTCMD_I2C_SLAVE_ADDR
	STM32_I2C_CR1(I2C_PORT_EC) |= STM32_I2C_CR1_RXIE | STM32_I2C_CR1_ERRIE
			| STM32_I2C_CR1_ADDRIE | STM32_I2C_CR1_STOPIE
			| STM32_I2C_CR1_NACKIE;
#if defined(CONFIG_LOW_POWER_IDLE) && (I2C_PORT_EC == STM32_I2C1_PORT)
	/*
	 * If using low power idle and EC port is I2C1, then set I2C1 to wake
	 * from STOP mode on address match. Note, this only works on I2C1 and
	 * only if the clock to I2C1 is HSI 8MHz.
	 */
	STM32_I2C_CR1(I2C_PORT_EC) |= STM32_I2C_CR1_WUPEN;
#endif
	STM32_I2C_OAR1(I2C_PORT_EC) = 0x8000 | CONFIG_HOSTCMD_I2C_SLAVE_ADDR;
#ifdef TCPCI_I2C_SLAVE
	/*
	 * Configure TCPC address with OA2[1] masked so that we respond
	 * to CONFIG_TCPC_I2C_BASE_ADDR and CONFIG_TCPC_I2C_BASE_ADDR + 2.
	 */
	STM32_I2C_OAR2(I2C_PORT_EC) = 0x8100 | CONFIG_TCPC_I2C_BASE_ADDR;
#endif
	task_enable_irq(IRQ_SLAVE);
#endif
}
コード例 #2
0
static void i2c_init_port(unsigned int port)
{
	const int i2c_clock_bit[] = {21, 22};

	if (!(STM32_RCC_APB1ENR & (1 << i2c_clock_bit[port]))) {
		/* Only unwedge the bus if the clock is off */
		if (i2c_claim(port) == EC_SUCCESS) {
			i2c_release(port);
		}

		/* enable I2C2 clock */
		STM32_RCC_APB1ENR |= 1 << i2c_clock_bit[port];
	}

	/* force reset of the i2c peripheral */
	STM32_I2C_CR1(port) = 0x8000;
	STM32_I2C_CR1(port) = 0x0000;

	/* set clock configuration : standard mode (100kHz) */
	STM32_I2C_CCR(port) = I2C_CCR;

	/* set slave address */
	if (port == I2C2)
		STM32_I2C_OAR1(port) = I2C_ADDRESS;

	/* configuration : I2C mode / Periphal enabled, ACK enabled */
	STM32_I2C_CR1(port) = (1 << 10) | (1 << 0);
	/* error and event interrupts enabled / input clock is 16Mhz */
	STM32_I2C_CR2(port) = (1 << 9) | (1 << 8) | 0x10;

	/* clear status */
	STM32_I2C_SR1(port) = 0;

	board_i2c_post_init(port);
}
コード例 #3
0
static inline void dump_i2c_reg(int port)
{
#ifdef CONFIG_I2C_DEBUG
	CPRINTF("CR1  : %016b\n", STM32_I2C_CR1(port));
	CPRINTF("CR2  : %016b\n", STM32_I2C_CR2(port));
	CPRINTF("SR2  : %016b\n", STM32_I2C_SR2(port));
	CPRINTF("SR1  : %016b\n", STM32_I2C_SR1(port));
	CPRINTF("OAR1 : %016b\n", STM32_I2C_OAR1(port));
	CPRINTF("OAR2 : %016b\n", STM32_I2C_OAR2(port));
	CPRINTF("DR   : %016b\n", STM32_I2C_DR(port));
	CPRINTF("CCR  : %016b\n", STM32_I2C_CCR(port));
	CPRINTF("TRISE: %016b\n", STM32_I2C_TRISE(port));
#endif /* CONFIG_I2C_DEBUG */
}