diff options
Diffstat (limited to 'libmaple')
| -rw-r--r-- | libmaple/i2c.c | 54 | ||||
| -rw-r--r-- | libmaple/i2c.h | 5 | ||||
| -rw-r--r-- | libmaple/rcc.c | 2 | ||||
| -rw-r--r-- | libmaple/rcc.h | 2 |
4 files changed, 48 insertions, 15 deletions
diff --git a/libmaple/i2c.c b/libmaple/i2c.c index a6638be..efe4dce 100644 --- a/libmaple/i2c.c +++ b/libmaple/i2c.c @@ -49,6 +49,19 @@ static i2c_dev i2c_dev1 = { i2c_dev* const I2C1 = &i2c_dev1; +static i2c_dev i2c_dev2 = { + .regs = I2C2_BASE, + .gpio_port = &gpiob, + .sda_pin = 11, + .scl_pin = 10, + .clk_line = RCC_I2C2, + .ev_nvic_line = NVIC_I2C2_EV, + .er_nvic_line = NVIC_I2C2_ER, + .state = I2C_STATE_IDLE +}; + +i2c_dev* const I2C2 = &i2c_dev2; + struct crumb { uint32 event; uint32 sr1; @@ -140,7 +153,8 @@ static void i2c_irq_handler(i2c_dev *dev) { * Master transmitter: write first byte to fill shift register. * We should get another TXE interrupt immediately to fill DR again. */ - i2c_write(dev, msg->data[msg->xferred++]); + if (msg->length != 1) + i2c_write(dev, msg->data[msg->xferred++]); } sr1 = sr2 = 0; } @@ -243,6 +257,10 @@ void __irq_i2c1_ev(void) { i2c_irq_handler(&i2c_dev1); } +void __irq_i2c2_ev(void) { + i2c_irq_handler(&i2c_dev2); +} + static void i2c_irq_error_handler(i2c_dev *dev) { uint32 sr1 = dev->regs->SR1; uint32 sr2 = dev->regs->SR2; @@ -257,6 +275,10 @@ void __irq_i2c1_er(void) { i2c_irq_error_handler(&i2c_dev1); } +void __irq_i2c2_er(void) { + i2c_irq_error_handler(&i2c_dev2); +} + static void i2c_bus_reset(const i2c_dev *dev) { /* Release both lines */ gpio_write_bit(dev->gpio_port, dev->scl_pin, 1); @@ -301,8 +323,11 @@ static void i2c_bus_reset(const i2c_dev *dev) { * I2C_10BIT_ADDRESSING: Enable 10-bit addressing */ void i2c_master_enable(i2c_dev *dev, uint32 flags) { +#define I2C_CLK (PCLK1/1000000) #define STANDARD_CCR (PCLK1/(100000*2)) -#define STANDARD_TRISE 37 +#define STANDARD_TRISE (I2C_CLK+1) +#define FAST_CCR (I2C_CLK/10) +#define FAST_TRISE ((I2C_CLK*3)/10+1) /* Reset the bus. Clock out any hung slaves. */ i2c_bus_reset(dev); @@ -313,17 +338,24 @@ void i2c_master_enable(i2c_dev *dev, uint32 flags) { gpio_set_mode(dev->gpio_port, dev->scl_pin, GPIO_AF_OUTPUT_OD); /* I2C1 and I2C2 are fed from APB1, clocked at 36MHz */ - i2c_set_input_clk(dev, 36); + i2c_set_input_clk(dev, I2C_CLK); - /* 100 khz only for now */ - i2c_set_clk_control(dev, STANDARD_CCR); + if(flags & I2C_FAST_MODE) { - /* - * Set scl rise time, standard mode for now. - * Max rise time in standard mode: 1000 ns - * Max rise time in fast mode: 300ns - */ - i2c_set_trise(dev, STANDARD_TRISE); + /* 400 kHz for fast mode, set DUTY and F/S bits */ + i2c_set_clk_control(dev, FAST_CCR|I2C_CCR_DUTY|I2C_CCR_FS); + + /* Set scl rise time, max rise time in fast mode: 300ns */ + i2c_set_trise(dev, FAST_TRISE); + + } else { + + /* 100 kHz for standard mode */ + i2c_set_clk_control(dev, STANDARD_CCR); + + /* Max rise time in standard mode: 1000 ns */ + i2c_set_trise(dev, STANDARD_TRISE); + } /* Enable event and buffer interrupts */ nvic_irq_enable(dev->ev_nvic_line); diff --git a/libmaple/i2c.h b/libmaple/i2c.h index a17e144..07ee260 100644 --- a/libmaple/i2c.h +++ b/libmaple/i2c.h @@ -71,8 +71,8 @@ typedef struct i2c_dev { i2c_msg *msg; } i2c_dev; - extern i2c_dev* const I2C1; +extern i2c_dev* const I2C2; #define I2C1_BASE (i2c_reg_map*)0x40005400 #define I2C2_BASE (i2c_reg_map*)0x40005800 @@ -100,7 +100,8 @@ extern i2c_dev* const I2C1; #define I2C_CR2_FREQ 0xFFF // Peripheral input frequency /* Clock control register bits */ -#define I2C_CCR_FS BIT(15) // Master mode selection +#define I2C_CCR_FS BIT(15) // Fast mode selection +#define I2C_CCR_DUTY BIT(14) // 16/9 duty ratio #define I2C_CCR_CCR 0xFFF // Clock control bits /* Status register 1 bits */ diff --git a/libmaple/rcc.c b/libmaple/rcc.c index 327e3ad..78abbcf 100644 --- a/libmaple/rcc.c +++ b/libmaple/rcc.c @@ -67,6 +67,7 @@ static const struct rcc_dev_info rcc_dev_table[] = { [RCC_PWR] = { .clk_domain = APB1, .line_num = 28}, [RCC_BKP] = { .clk_domain = APB1, .line_num = 27}, [RCC_I2C1] = { .clk_domain = APB1, .line_num = 21 }, + [RCC_I2C2] = { .clk_domain = APB1, .line_num = 22 }, [RCC_CRC] = { .clk_domain = AHB, .line_num = 6}, [RCC_FLITF] = { .clk_domain = AHB, .line_num = 4}, [RCC_SRAM] = { .clk_domain = AHB, .line_num = 2}, @@ -83,7 +84,6 @@ static const struct rcc_dev_info rcc_dev_table[] = { [RCC_FSMC] = { .clk_domain = AHB, .line_num = 8 }, [RCC_DAC] = { .clk_domain = APB1, .line_num = 29 }, [RCC_DMA2] = { .clk_domain = AHB, .line_num = 1 }, - [RCC_I2C2] = { .clk_domain = APB1, .line_num = 22 }, [RCC_SDIO] = { .clk_domain = AHB, .line_num = 10 }, #endif #ifdef STM32_XL_DENSITY diff --git a/libmaple/rcc.h b/libmaple/rcc.h index e6fa196..91f77d0 100644 --- a/libmaple/rcc.h +++ b/libmaple/rcc.h @@ -449,6 +449,7 @@ typedef enum { RCC_PWR, RCC_BKP, RCC_I2C1, + RCC_I2C2, RCC_CRC, RCC_FLITF, RCC_SRAM, @@ -465,7 +466,6 @@ typedef enum { RCC_FSMC, RCC_DAC, RCC_DMA2, - RCC_I2C2, RCC_SDIO, #endif #ifdef STM32_XL_DENSITY |