diff options
Diffstat (limited to 'i2c/i2c.h')
| -rw-r--r-- | i2c/i2c.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/i2c/i2c.h b/i2c/i2c.h new file mode 100644 index 0000000..f4d6949 --- /dev/null +++ b/i2c/i2c.h @@ -0,0 +1,62 @@ +#ifndef I2C_H +#define I2C_H + +#include <stdint.h> +#include <interrupt/interrupt.h> +#include <gpio/pin.h> + +struct I2C_reg_t { + volatile uint32_t CR1; + volatile uint32_t CR2; + volatile uint32_t OAR1; + volatile uint32_t OAR2; + volatile uint32_t DR; + volatile uint32_t SR1; + volatile uint32_t SR2; + volatile uint32_t CCR; + volatile uint32_t TRISE; +}; + +class I2C_t { + private: + volatile uint8_t addr; + volatile uint8_t writing; + volatile uint8_t reading; + volatile uint8_t* write_p; + volatile uint8_t* read_p; + + volatile bool busy; + + public: + I2C_reg_t& reg; + const uint32_t clk; + Interrupt::IRQ irq_ev_n; + Interrupt::IRQ irq_er_n; + + I2C_t(uint32_t reg_addr, uint32_t bus_clk, Interrupt::IRQ ev_n, Interrupt::IRQ er_n) : reg(*(I2C_reg_t*)reg_addr), clk(bus_clk), irq_ev_n(ev_n), irq_er_n(er_n) { + reading = writing = 0; + } + + void irq_ev(); + void irq_er(); + + void handle_error(); + + void enable(Pin& scl, Pin& sda); + + void write_reg(uint8_t addr_, uint8_t reg_, uint8_t data); + void read_reg(uint8_t addr_, uint8_t reg_, uint8_t len, uint8_t* buf); +}; + +#if defined(STM32F1) +extern I2C_t I2C1; +extern I2C_t I2C2; +#elif defined(STM32F4) +extern I2C_t I2C1; +extern I2C_t I2C2; +extern I2C_t I2C3; +#endif + +typedef I2C_t I2C; + +#endif |