Qcom LK阶段如何使用I2C介绍

最新推荐文章于 2024-04-17 19:40:43 发布

Eliot_shao

最新推荐文章于 2024-04-17 19:40:43 发布

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分类专栏：高通文章标签： LK 高通 I2C

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本文详细介绍了QcomLK阶段如何通过I2C接口进行读写操作的具体实现方式，包括初始化过程和读写函数的实现细节。

下面是Qcom LK阶段使用I2C的代码：

#include <i2c_qup.h>
#include <blsp_qup.h>

static struct qup_i2c_dev  *i2c_dev;

i2c_dev = qup_blsp_i2c_init(BLSP_ID_1, QUP_ID_1, 100000, 19200000);

static int qrd_lcd_i2c_read(uint8_t addr)
{
	int ret = 0;
	/* Create a i2c_msg buffer, that is used to put the controller into read
	   mode and then to read some data. */
	struct i2c_msg msg_buf[] = {
		{QRD_LCD_I2C_ADDRESS, I2C_M_WR, 1, &addr},
		{QRD_LCD_I2C_ADDRESS, I2C_M_RD, 1, &ret}
	};

	ret = qup_i2c_xfer(i2c_dev, msg_buf, 2);
	if(ret < 0) {
		dprintf(CRITICAL, "qup_i2c_xfer error %d\n", ret);
		return ret;
	}
	return 0;
}
static int qrd_lcd_i2c_write(uint8_t addr, uint8_t val)
{
	int ret = 0;
	uint8_t data_buf[] = { addr, val };

	/* Create a i2c_msg buffer, that is used to put the controller into write
	   mode and then to write some data. */
	struct i2c_msg msg_buf[] = { {QRD_LCD_I2C_ADDRESS,
				      I2C_M_WR, 2, data_buf}
	};
	ret = qup_i2c_xfer(i2c_dev, msg_buf, 1);
	if(ret < 0) {
		dprintf(CRITICAL, "qup_i2c_xfer error %d\n", ret);
		return ret;
	}
	return 0;
}