sync(template): 回合 capsule_mb 通用驱动修复

- uart_ring_buffer: PRIMASK 位检查从 ==0 改为 &0x1 修正
- i2c: 新增 i2c_read_raw() 无子地址读函数
- 全局: volatile 统一替换为 __IO (CMSIS 风格)

Inc/i2c.h

@@ -129,6 +129,16 @@ i2c_result_t i2c_write(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data, uint
 */
 i2c_result_t i2c_read(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data, uint8_t length);
 
+/* Pure read response without sub-address phase (for commands that already sent read request parameters) */
+/*!
+    \brief      read data from I2C device without register/sub-address phase
+    \param[in]  slave_addr: slave device address (7-bit)
+    \param[out] data: pointer to data buffer
+    \param[in]  length: number of bytes to read (1-255)
+    \retval     i2c_result_t: operation result
+*/
+i2c_result_t i2c_read_raw(uint8_t slave_addr, uint8_t *data, uint8_t length);
+
 #ifdef DEBUG_VERBOSE
 /*!
     \brief      get status string for debugging