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4.2-4.4

article 2026/4/9 6:52:20
这期准备iic驱动上一期已经准备好了设备树iic的驱动代码分为 I2C 适配器驱动和 I2C 设备驱动一般iic适配器驱动由soc厂商去写iic设备树追加1 i2c4 {2 status okay;3 pinctrl-0 i2c4m1_xfer;4 //sh3001_acc是设备名iic设备地址365 sh3001_acc36 {6 compatible sh3001_acc;7 //compatible sh3001_acc;8 reg 0x36;//SENSOR_TYPE_ACCEL这个类型是 RK 内定的 sensor 类型9 type SENSOR_TYPE_ACCEL;10 pinctrl-names default;11 pinctrl-0 sh3001_irq_gpio;//传感器中断口默认电平高12 irq-gpio gpio2 RK_PC4 IRQ_TYPE_LEVEL_HIGH;//关闭中断使用轮询读取数据13 irq_enable 0;//30ms读取一次14 poll_delay_ms 30;//传感器方向15 layout 2;16 status okay;17 };1819 sh3001_gyro36 {20 compatible sh3001_gyro;21 //compatible sh3001_gyro;22 reg 0x36;23 type SENSOR_TYPE_GYROSCOPE;24 //pinctrl-names default;25 //pinctrl-0 sh3001_irq_gpio;26 //irq-gpio gpio2 RK_PC4 IRQ_TYPE_LEVEL_HIGH;27 irq_enable 0; //Must be set to 0, disable interrup28 poll_delay_ms 30;29 layout 1;30 status okay;31 };32 };加了这个设备树iic_client会自动的在系统创建设备这期使用的不是这个陀螺仪是用iic驱动OLED显示屏可以模仿这个设备树进行修改查看原理图使用GPIO1_A0复用I2C2_SDA_M4GPIO1_A1复用I2C2_SCL_M4pinctrl-0 i2c2m4_xfer;已经在pinctrl.dtsi定义好追加下面的内容i2c2 {status okay;pinctrl-names default;pinctrl-0 i2c2m4_xfer;oled3c{compatible rzroomi,oled;reg 0x3c;status okay;}};注意地址是7位的所以是0x3c。那么正常8位写地址是0x78读是0x79oled_font.h把以前的oled字库复制即可#ifndef __OLED_FONT_H #define __OLED_FONT_H {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, {0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00}, {0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, {0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00}, {0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00}, {0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00}, {0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10}, {0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, {0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00}, {0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00}, {0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00}, {0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00}, {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00}, {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00}, {0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00}, {0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00}, {0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00}, {0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00}, {0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00}, {0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00}, {0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00}, {0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00}, {0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00}, {0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00}, {0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00}, {0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00}, {0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00}, {0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00}, {0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00}, {0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00}, {0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00}, {0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00}, {0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20}, {0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00}, {0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00}, {0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00}, {0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00}, {0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00}, {0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00}, {0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20}, {0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00}, {0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00}, {0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00}, {0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00}, {0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00}, {0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00}, {0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00}, {0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00}, {0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00}, {0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20}, {0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00}, {0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00}, {0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00}, {0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00}, {0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00}, {0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20}, {0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00}, {0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00}, {0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00}, {0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00}, {0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00}, {0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80}, {0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, {0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20}, {0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00}, {0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00}, {0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20}, {0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00}, {0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00}, {0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00}, {0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20}, {0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00}, {0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00}, {0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00}, {0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00}, {0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F}, {0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20}, {0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00}, {0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00}, {0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80}, {0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00}, {0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00}, {0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00}, {0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20}, {0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00}, {0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00}, {0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00}, {0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00}, {0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00}, {0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40}, {0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00}, {0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00}, {0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00} #endif驱动代码oled.c#include linux/module.h #include linux/i2c.h #include linux/kernel.h #include linux/delay.h #include linux/of.h //字库导入 const u8 OLED_F8x16[][16] { #include oled_font.h }; #define OLED_CMD 0x00 #define OLED_DATA 0x40 /* 写命令和写数据最重要的函数就是 return i2c_master_send(client, buf, 2); 发送字节的函数已经写好了 */ static int oled_write_cmd(struct i2c_client *client, u8 cmd) { u8 buf[2] { OLED_CMD, cmd }; return i2c_master_send(client, buf, 2); } static int oled_write_data(struct i2c_client *client, u8 data) { u8 buf[2] { OLED_DATA, data }; return i2c_master_send(client, buf, 2); } /* 单片机的oled显示代码复制过来稍作修改 多加入一个client也就是传入设备地址 */ //设置光标 static void oled_set_cursor(struct i2c_client *client, u8 y, u8 x) { oled_write_cmd(client, 0xB0 | y); oled_write_cmd(client, 0x10 | ((x 4) 0x0F)); oled_write_cmd(client, 0x00 | (x 0x0F)); } //清屏 static void oled_clear(struct i2c_client *client) { int i, j; for (j 0; j 8; j) { oled_set_cursor(client, j, 0); for (i 0; i 128; i) oled_write_data(client, 0x00); } } //显示 8*16 字符 void oled_show_char(struct i2c_client *client, u8 line, u8 col, char c) { int i; u8 y (line - 1) * 2; u8 x (col - 1) * 8; const u8 *dots OLED_F8x16[c - ]; oled_set_cursor(client, y, x); for (i 0; i 8; i) oled_write_data(client, dots[i]); oled_set_cursor(client, y1, x); for (i 0; i 8; i) oled_write_data(client, dots[i8]); } //显示字符串 void oled_show_string(struct i2c_client *client, u8 line, u8 col, char *str) { int i; for (i 0; str[i]; i) oled_show_char(client, line, col i, str[i]); } /* 初始化写入命令来设置OLED的时钟起始方向对比度等等 对于ds1302通用从以前的代码复制即可 */ static void oled_init(struct i2c_client *client) { msleep(100); oled_write_cmd(client, 0xAE); oled_write_cmd(client, 0xD5); oled_write_cmd(client, 0x80); oled_write_cmd(client, 0xA8); oled_write_cmd(client, 0x3F); oled_write_cmd(client, 0xD3); oled_write_cmd(client, 0x00); oled_write_cmd(client, 0x40); oled_write_cmd(client, 0xA1); oled_write_cmd(client, 0xC8); oled_write_cmd(client, 0xDA); oled_write_cmd(client, 0x12); oled_write_cmd(client, 0x81); oled_write_cmd(client, 0xCF); oled_write_cmd(client, 0xD9); oled_write_cmd(client, 0xF1); oled_write_cmd(client, 0xDB); oled_write_cmd(client, 0x30); oled_write_cmd(client, 0xA4); oled_write_cmd(client, 0xA6); oled_write_cmd(client, 0x8D); oled_write_cmd(client, 0x14); oled_write_cmd(client, 0xAF); oled_clear(client); } /* client包含iic的所有信息如I2C号、设备地址、寄存器等 */ static int oled_probe(struct i2c_client *client, const struct i2c_device_id *id) { oled_init(client); oled_show_string(client, 1, 1, hello word); return 0; } static int oled_remove(struct i2c_client *client) { return 0; } static const struct of_device_id oled_dt_ids[] { { .compatible rzroomi,oled }, {} }; MODULE_DEVICE_TABLE(of, oled_dt_ids); static struct i2c_driver oled_driver { .probe oled_probe, .remove oled_remove, .driver { .of_match_table oled_dt_ids, }, }; module_i2c_driver(oled_driver); MODULE_LICENSE(GPL); MODULE_AUTHOR(rzroomi);可见iic驱动框架和platform很类似在底层代码有oled_write_cmd函数不用写开始停止那些iic通信代码里编译烧入到板子里接好OLED成功显示hello word接下来写写spi驱动修改设备树spi0 {pinctrl-names default;pinctrl-0 spi0m2_pins;cs-gpios gpio1 RK_PB5 GPIO_ACTIVE_LOW;status okay;w25q64: flash0 {compatible jedec,spi-nor;reg 0;spi-max-frequency 50000000;m25p,fast-read;status okay;};};reg 0;表示使用第 0 个片选spi-max-frequency表示50MHZm25p,fast-read;表示开启快速读写模式写好测试代码发现根本通信不了打印的日志一直显示0xff[ 308.643201] w25q64 spi0.0: W25Q64 ID: 0xFF, 0xFFFF排查可以使用逻辑分析仪但是这个东西我没用过身边也没。之后的解决办法就是先使用软件spi就是使用gpio去模拟spi通信看看是不是引脚被复用了如果成功读取写入就使用硬件spi修改设备树降低spi频率尝试通信力竭了这期先到这如果有错误和建议欢迎留言谢谢

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