SSD1306 oled屏驱动失败 程序跑飞

[chenguozi]

程序在进入lcd初始化阶段就跑飞，仔细阅读的源代码发现一个问题，

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1. scr_interface_create(SCREEN_IFACE_I2C , &iface_cfg, &iface_drv);

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在这个函数内部

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1.         interface_i2c->interface_drv.type        = type;
2.         interface_i2c->interface_drv.write_cmd   = i2c_lcd_write_cmd;
3.         interface_i2c->interface_drv.write_data  = i2c_lcd_write_data;
4.         interface_i2c->interface_drv.write       = i2c_lcd_write;
5.         interface_i2c->interface_drv.read        = i2c_lcd_read;
6.         interface_i2c->interface_drv.bus_acquire = i2c_lcd_acquire;
7.         interface_i2c->interface_drv.bus_release = i2c_lcd_release;

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给出了interface_i2c的处理函数地址
配置lcd初始化参数时

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1. lcd_cfg.interface_drv = iface_drv

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使用这个参数对lcd进行初始化

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1. esp_err_t lcd_ssd1306_init(const scr_controller_config_t *lcd_conf)
2. {
3.  
4. //////////////////////////////////////////////
5.     g_lcd_handle.interface_drv = lcd_conf->interface_drv; //这个时候传递给了 g_lcd_handle
6.  
7. ///////////////////////////////////////////////////
8.  
9.     LCD_WRITE_CMD(0xAE); //--turn off oled panel
10.  
11. ////////////////////////////////////////////////

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#define LCD_WRITE_COMMAND(data, length) g_lcd_handle.interface_drv->write_command(g_lcd_handle.interface_drv, (data), (length))

static inline esp_err_t LCD_WRITE_CMD(uint8_t cmd)
{
return LCD_WRITE_COMMAND((uint8_t*)&cmd, 1);
}

在interface_drv_def.h文件中，把LCD_WRITE_CMD指向了LCD_WRITE_COMMAND

而LCD_WRITE_COMMAND 指向的是 g_lcd_handle.interface_drv->write_command
根据前面的参数我认为，LCD_WRITE_COMMAND 应该指向。 g_lcd_handle.interface_drv->write_cmd
write_command 前面根本就没有赋值，所以一调用就跑飞。（这个地方解释起来真是自己都觉得很绕，不知道是否说清楚了）
不知道我的理解是否正确。还是我理解存在问题，还请大家指点