Initial import.

Most sources are split off from suzumebachi project revision 2fc77d2 as is with some path changes. New build rules introduced.

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