void i2c2_hw_init(void) { i2c2.reg_addr = (void *)I2C2; i2c2.init_struct = NULL; i2c2.errors = &i2c2_errors; i2c2_watchdog_counter = 0; /* zeros error counter */ ZEROS_ERR_COUNTER(i2c2_errors); /* reset peripheral to default state ( sometimes not achieved on reset :( ) */ //i2c_reset(I2C2); /* Configure priority grouping 0 bits for pre-emption priority and 4 bits for sub-priority. */ scb_set_priority_grouping(SCB_AIRCR_PRIGROUP_NOGROUP_SUB16); /* Configure and enable I2C2 event interrupt --------------------------------*/ nvic_set_priority(NVIC_I2C2_EV_IRQ, 0); nvic_enable_irq(NVIC_I2C2_EV_IRQ); /* Configure and enable I2C2 err interrupt ----------------------------------*/ nvic_set_priority(NVIC_I2C2_ER_IRQ, 1); nvic_enable_irq(NVIC_I2C2_ER_IRQ); /* Enable peripheral clocks -------------------------------------------------*/ /* Enable I2C2 clock */ rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_I2C2EN); /* Enable GPIO clock */ gpio_enable_clock(I2C2_GPIO_PORT); #if defined(STM32F1) gpio_set_mode(I2C2_GPIO_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, I2C2_GPIO_SCL | I2C2_GPIO_SDA); #elif defined(STM32F4) gpio_mode_setup(I2C2_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_NONE, I2C2_GPIO_SCL | I2C2_GPIO_SDA); gpio_set_output_options(I2C2_GPIO_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, I2C2_GPIO_SCL | I2C2_GPIO_SDA); gpio_set_af(I2C2_GPIO_PORT, GPIO_AF4, I2C2_GPIO_SCL | I2C2_GPIO_SDA); #endif i2c_reset(I2C2); // enable peripheral i2c_peripheral_enable(I2C2); /* * XXX: there is a function to do that already in libopencm3 but I am not * sure if it is correct, using direct register instead (esden) */ //i2c_set_own_7bit_slave_address(I2C2, 0); I2C_OAR1(I2C2) = 0 | 0x4000; // enable error interrupts I2C_CR2(I2C1) |= I2C_CR2_ITERREN; i2c_setbitrate(&i2c2, I2C2_CLOCK_SPEED); }
void i2c3_hw_init(void) { i2c3.reg_addr = (void *)I2C3; i2c3.init_struct = NULL; i2c3.errors = &i2c3_errors; i2c3_watchdog_counter = 0; /* zeros error counter */ ZEROS_ERR_COUNTER(i2c3_errors); /* reset peripheral to default state ( sometimes not achieved on reset :( ) */ //i2c_reset(I2C3); /* Configure and enable I2C3 event interrupt --------------------------------*/ nvic_set_priority(NVIC_I2C3_EV_IRQ, NVIC_I2C3_IRQ_PRIO); nvic_enable_irq(NVIC_I2C3_EV_IRQ); /* Configure and enable I2C3 err interrupt ----------------------------------*/ nvic_set_priority(NVIC_I2C3_ER_IRQ, NVIC_I2C3_IRQ_PRIO+1); nvic_enable_irq(NVIC_I2C3_ER_IRQ); /* Enable peripheral clocks -------------------------------------------------*/ /* Enable I2C3 clock */ rcc_periph_clock_enable(RCC_I2C3); /* Enable GPIO clock */ gpio_enable_clock(I2C3_GPIO_PORT_SCL); gpio_mode_setup(I2C3_GPIO_PORT_SCL, GPIO_MODE_AF, GPIO_PUPD_NONE, I2C3_GPIO_SCL); gpio_set_output_options(I2C3_GPIO_PORT_SCL, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, I2C3_GPIO_SCL); gpio_set_af(I2C3_GPIO_PORT_SCL, GPIO_AF4, I2C3_GPIO_SCL); gpio_enable_clock(I2C3_GPIO_PORT_SDA); gpio_mode_setup(I2C3_GPIO_PORT_SDA, GPIO_MODE_AF, GPIO_PUPD_NONE, I2C3_GPIO_SDA); gpio_set_output_options(I2C3_GPIO_PORT_SDA, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, I2C3_GPIO_SDA); gpio_set_af(I2C3_GPIO_PORT_SDA, GPIO_AF4, I2C3_GPIO_SDA); i2c_reset(I2C3); // enable peripheral i2c_peripheral_enable(I2C3); /* * XXX: there is a function to do that already in libopencm3 but I am not * sure if it is correct, using direct register instead (esden) */ //i2c_set_own_7bit_slave_address(I2C3, 0); I2C_OAR1(I2C3) = 0 | 0x4000; // enable error interrupts I2C_CR2(I2C1) |= I2C_CR2_ITERREN; i2c_setbitrate(&i2c3, I2C3_CLOCK_SPEED); }
void i2c1_hw_init(void) { i2c1.reg_addr = (void *)I2C1; i2c1.init_struct = NULL; i2c1.errors = &i2c1_errors; i2c1.watchdog = -1; /* zeros error counter */ ZEROS_ERR_COUNTER(i2c1_errors); // Extra #ifdef I2C_DEBUG_LED LED_INIT(); #else /* reset peripheral to default state ( sometimes not achieved on reset :( ) */ //rcc_periph_reset_pulse(RST_I2C1); /* Configure and enable I2C1 event interrupt --------------------------------*/ nvic_set_priority(NVIC_I2C1_EV_IRQ, NVIC_I2C1_IRQ_PRIO); nvic_enable_irq(NVIC_I2C1_EV_IRQ); /* Configure and enable I2C1 err interrupt ----------------------------------*/ nvic_set_priority(NVIC_I2C1_ER_IRQ, NVIC_I2C1_IRQ_PRIO+1); nvic_enable_irq(NVIC_I2C1_ER_IRQ); /* Enable peripheral clocks -------------------------------------------------*/ /* Enable I2C1 clock */ rcc_periph_clock_enable(RCC_I2C1); /* setup gpio clock and pins */ i2c_setup_gpio(I2C1); rcc_periph_reset_pulse(RST_I2C1); // enable peripheral i2c_peripheral_enable(I2C1); /* * XXX: there is a function to do that already in libopencm3 but I am not * sure if it is correct, using direct register instead (esden) */ //i2c_set_own_7bit_slave_address(I2C1, 0); I2C_OAR1(I2C1) = 0 | 0x4000; // enable error interrupts i2c_enable_interrupt(I2C1, I2C_CR2_ITERREN); i2c_setbitrate(&i2c1, I2C1_CLOCK_SPEED); #endif }
void i2c_setup(void) { rcc_periph_clock_enable(RCC_I2C1); rcc_periph_clock_enable(RCC_GPIOB); //clock from 48 MHz RCC_CFGR3 |= RCC_CFGR3_I2C1SW; //i2c_reset(I2C_BUS); RCC_APB1RSTR |= RCC_APB1RSTR_I2C1RST; RCC_APB1RSTR &= ~RCC_APB1RSTR_I2C1RST; gpio_mode_setup(I2C_PIN_PORT, GPIO_MODE_AF, GPIO_PUPD_NONE, I2C_PINS); gpio_set_af(I2C_PIN_PORT, I2C_PIN_AF, I2C_PINS); //i2c_peripheral_disable(I2C_BUS); I2C_CR1(I2C_BUS) &= ~I2C_CR1_PE; //configure ANFOFF DNF[3:0] in CR1 //i2c_enable_analog_filter(I2C_BUS); I2C_CR1(I2C_BUS) &= ~I2C_CR1_ANFOFF; //i2c_set_digital_filter(I2C_BUS, I2C_CR1_DNF_DISABLED); //default is good //Configure PRESC[3:0] SDADEL[3:0] SCLDEL[3:0] SCLH[7:0] SCLL[7:0] // in TIMINGR //i2c_100khz_i2cclk8mhz(I2C_BUS); //let's assume this is good :) //I don't think the timing matters when we're slave I2C_TIMINGR(I2C_BUS) = 0; //configure No-Stretch CR1 (only relevant in slave mode) //i2c_enable_stretching(I2C_BUS); //addressing mode //i2c_set_7bit_addr_mode(I2C_BUS); //default is good //slave address I2C_OAR1(I2C_BUS) = I2C_OAR1_OA1EN + (I2C_SLAVE_ADDRESS << 1); //enable all interrupts I2C_CR1(I2C_BUS) |= 0xfe; //i2c_peripheral_enable(I2C_BUS); I2C_CR1(I2C_BUS) |= I2C_CR1_PE; nvic_enable_irq(NVIC_I2C1_IRQ); }
void init_i2c(const i2c_config *ip) { // Enable periph clock. // Configure GPIO. // Reset I²C. uint32_t base = ip->i_base_address; enum rcc_periph_clken clken; switch (base) { case I2C1: clken = RCC_I2C1; break; case I2C2: clken = RCC_I2C2; break; default: assert(false && "unknown I2C base address"); } rcc_periph_clock_enable(clken); gpio_init_pins(ip->i_pins, (&ip->i_pins)[1] - ip->i_pins); uint32_t i2c_freq_mhz = rcc_apb1_frequency / 1000000; uint32_t ccr = rcc_apb1_frequency / I2C_BAUD / 2 + 1; if (ccr < 4) ccr = 4; i2c_peripheral_disable(base); i2c_set_clock_frequency(base, i2c_freq_mhz); i2c_set_trise(base, i2c_freq_mhz + 1); i2c_set_ccr(base, ccr); I2C_CR1(base) = 0; I2C_OAR1(base) = ip->i_own_address; i2c_peripheral_enable(base); }
void i2c_set_own_10bit_slave_address(uint32_t i2c, uint16_t slave) { I2C_OAR1(i2c) = (uint16_t)(I2C_OAR1_OA1MODE | slave); }
void i2c_set_own_7bit_slave_address(uint32_t i2c, uint8_t slave) { I2C_OAR1(i2c) = (uint16_t)(slave << 1); I2C_OAR1(i2c) &= ~I2C_OAR1_OA1MODE; I2C_OAR1(i2c) |= (1 << 14); /* Datasheet: always keep 1 by software. */ }
void i2c_set_own_10bit_slave_address(u32 i2c, u16 slave) { I2C_OAR1(i2c) = (u16)(I2C_OAR1_ADDMODE | slave); }
void i2c_set_own_7bit_slave_address(u32 i2c, u8 slave) { I2C_OAR1(i2c) = (u16)(slave << 1); I2C_OAR1(i2c) &= ~I2C_OAR1_ADDMODE; I2C_OAR1(i2c) |= (1 << 14); /* Datasheet: always keep 1 by software. */ }
void i2c1_hw_init(void) { i2c1.reg_addr = (void *)I2C1; i2c1.init_struct = NULL; i2c1.errors = &i2c1_errors; i2c1_watchdog_counter = 0; /* zeros error counter */ ZEROS_ERR_COUNTER(i2c1_errors); // Extra #ifdef I2C_DEBUG_LED LED_INIT(); #else /* reset peripheral to default state ( sometimes not achieved on reset :( ) */ //i2c_reset(I2C1); /* Configure and enable I2C1 event interrupt --------------------------------*/ nvic_set_priority(NVIC_I2C1_EV_IRQ, NVIC_I2C1_IRQ_PRIO); nvic_enable_irq(NVIC_I2C1_EV_IRQ); /* Configure and enable I2C1 err interrupt ----------------------------------*/ nvic_set_priority(NVIC_I2C1_ER_IRQ, NVIC_I2C1_IRQ_PRIO+1); nvic_enable_irq(NVIC_I2C1_ER_IRQ); /* Enable peripheral clocks -------------------------------------------------*/ /* Enable I2C1 clock */ rcc_periph_clock_enable(RCC_I2C1); /* Enable GPIO clock */ gpio_enable_clock(I2C1_GPIO_PORT); #if defined(STM32F1) gpio_set_mode(I2C1_GPIO_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, I2C1_GPIO_SCL | I2C1_GPIO_SDA); #elif defined(STM32F4) gpio_mode_setup(I2C1_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_NONE, I2C1_GPIO_SCL | I2C1_GPIO_SDA); gpio_set_output_options(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, I2C1_GPIO_SCL | I2C1_GPIO_SDA); gpio_set_af(I2C1_GPIO_PORT, GPIO_AF4, I2C1_GPIO_SCL | I2C1_GPIO_SDA); #endif i2c_reset(I2C1); // enable peripheral i2c_peripheral_enable(I2C1); /* * XXX: there is a function to do that already in libopencm3 but I am not * sure if it is correct, using direct register instead (esden) */ //i2c_set_own_7bit_slave_address(I2C1, 0); I2C_OAR1(I2C1) = 0 | 0x4000; // enable error interrupts I2C_CR2(I2C1) |= I2C_CR2_ITERREN; i2c_setbitrate(&i2c1, I2C1_CLOCK_SPEED); #endif }