From dc570b0b389d23b8ea8b46311294a7040b5e1e44 Mon Sep 17 00:00:00 2001
From: さくらんぼ <47372812+sakurachari@users.noreply.github.com>
Date: Fri, 12 Apr 2019 01:07:39 +0900
Subject: Keyboard: Add yosino58 Keyboard (#5465)

* Keyboard: Add yosino58 Keyboard

* Keyboard: Add yosino58 Keyboard
---
 keyboards/yosino58/i2c.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 keyboards/yosino58/i2c.h

(limited to 'keyboards/yosino58/i2c.h')

diff --git a/keyboards/yosino58/i2c.h b/keyboards/yosino58/i2c.h
new file mode 100644
index 000000000..710662c7a
--- /dev/null
+++ b/keyboards/yosino58/i2c.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifndef F_CPU
+#define F_CPU 16000000UL
+#endif
+
+#define I2C_READ 1
+#define I2C_WRITE 0
+
+#define I2C_ACK 1
+#define I2C_NACK 0
+
+#define SLAVE_BUFFER_SIZE 0x10
+
+// i2c SCL clock frequency 400kHz
+#define SCL_CLOCK  400000L
+
+extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
+
+void i2c_master_init(void);
+uint8_t i2c_master_start(uint8_t address);
+void i2c_master_stop(void);
+uint8_t i2c_master_write(uint8_t data);
+uint8_t i2c_master_read(int);
+void i2c_reset_state(void);
+void i2c_slave_init(uint8_t address);
+
+
+static inline unsigned char i2c_start_read(unsigned char addr) {
+  return i2c_master_start((addr << 1) | I2C_READ);
+}
+
+static inline unsigned char i2c_start_write(unsigned char addr) {
+  return i2c_master_start((addr << 1) | I2C_WRITE);
+}
+
+// from SSD1306 scrips
+extern unsigned char i2c_rep_start(unsigned char addr);
+extern void i2c_start_wait(unsigned char addr);
+extern unsigned char i2c_readAck(void);
+extern unsigned char i2c_readNak(void);
+extern unsigned char i2c_read(unsigned char ack);
+
+#define i2c_read(ack)  (ack) ? i2c_readAck() : i2c_readNak();
-- 
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