RK3188&AW9523B I2C介面LED驅動（2）
阿新 • • 發佈：2019-02-04
之前做了一個GPIO模式下的LED驅動，由於是按I2C匯流排分組設定LED的，所以在實際應用中是不夠的，這次根據文件完成了LED模式下的LED驅動，及單個燈可控驅動。
根據文件可知，配置13H暫存器為0即可設P1_7-P1_0為LED模式。
而LED模式下的控制相對GPIO模式要簡單的多，只需要對每個口連線的燈設定顏色即可，這裡的顏色是如下圖對應的顏色，分為256個級別，及紅黃藍各有256個級別；
例如P1_0口接的是紅燈，而P1_1接的是綠，P1_2接的是藍，則如需要顯示紅色則對節點傳入ff0000即可。
程式碼如下：
static void switch_to_led_mode()
{
//配置成LED模式 由於之前程式碼太凌亂，所以由帶頭大哥幫忙整理了下程式碼，瞬間把我秒成渣了。
SYS節點註冊：
#define CREATE_SYSFS_LED(obj,_name,_port) \
{\
ret = sysfs_create_file(obj, &dev_attr_##_name##_port.attr);\ DEVICE_ATTR show和store函式：
//將傳入的要顯示的顏色值分別出紅綠藍對應的值
static void int_convert_to_color_t(int value,unsigned char *red,unsigned char *green,unsigned char * blue)
{
*blue=value&0xFF;
value=value/256;
*green=value&0xFF;
value=value/256;
*red=value&0xFF;
}
static ssize_t led_store(struct device *dev,
struct device_attribute *attr,const char *buf, size_t count,int port)
{
unsigned char red;
unsigned char green;
unsigned char blue;
int color;
if(port> LED_MAX)
return -1;
printk("set led =%d color=%s \n",port,buf);
#if 1
sscanf(buf, "%du", &color);
int_convert_to_color_t(color,&red,&green,&blue);
all_led[port].color.red=red;
all_led[port].color.green=green;
all_led[port].color.blue=blue;
set_led_color(all_led[port]);
printk("ok red=%d green=%d blue=%d \n",red,green,blue);
#endif
return count;
}
static ssize_t led_show(struct device *dev,
struct device_attribute *attr, char *buf,int port)
{
int red_value = 0, green_value = 0, blue_value = 0;
ssize_t ret = 0;
printk("cat debug buf++++++++++++++++++++++++++++++++++++=\n");
red_value = all_led[port].color.red;
green_value = all_led[port].color.green;
blue_value = all_led[port].color.blue;
ret = red_value * 256 * 256 + green_value * 256 + blue_value;
printk("++++++ret = %d\n++++++", ret);
sprintf(buf, "ret = %d\n", ret);
ret = strlen(buf) + 1;
return ret;
}
#define LED_DEVICE_ATTR(name_,_port) \
static ssize_t led_show_##_port(struct device *dev, \
struct device_attribute *attr, char *buf) \
{\
return led_show(dev,attr,buf,_port);\
}\
static ssize_t led_store_##_port(struct device *dev,\
struct device_attribute *attr,const char *buf, size_t count)\
{\
return led_store(dev,attr,buf,count,_port);\
}\
static DEVICE_ATTR(name_##_port, 0666,led_show_##_port, led_store_##_port);
LED_DEVICE_ATTR(led, 2)
LED_DEVICE_ATTR(led, 3)
LED_DEVICE_ATTR(led, 4)
LED_DEVICE_ATTR(led, 5)
LED_DEVICE_ATTR(led, 6)
設定燈口以及燈口對應的顏色值：
typedef struct{
unsigned char red;
unsigned char green;
unsigned char blue;
}rgb_reg_t;
typedef struct{
unsigned char red;
unsigned char green;
unsigned char blue;
}color_t;
typedef struct{
rgb_reg_t reg;
color_t color;
}led_t;
static void set_led_RGB(unsigned char reg,unsigned char data)
{
char buffer[LED_REG_LEN];
buffer[0]=reg;
buffer[1]=data;
//buffer[0]是暫存器地址，buffer[1]是傳入的資料
led_tx8_data(this_client, &buffer[0], 2);
led_rx_data(this_client, &buffer[0], 1);
}
static void set_led_color(led_t led)
{
set_led_RGB(led.reg.red,led.color.red);
set_led_RGB(led.reg.green,led.color.green);
set_led_RGB(led.reg.blue,led.color.blue);
}
static void init_all_led()
{
//led 6
all_led[LED_6].reg.red = GPIO_P1_4;
all_led[LED_6].reg.green = GPIO_P1_5;
all_led[LED_6].reg.blue = GPIO_P1_6;
//led 5
all_led[LED_5].reg.red = GPIO_P0_5;
all_led[LED_5].reg.green = GPIO_P0_6;
all_led[LED_5].reg.blue = GPIO_P0_7;
//led 4
all_led[LED_4].reg.red = GPIO_P0_2;
all_led[LED_4].reg.green = GPIO_P0_3;
all_led[LED_4].reg.blue = GPIO_P0_4;
//led 3
all_led[LED_3].reg.red = GPIO_P1_3;
all_led[LED_3].reg.green = GPIO_P0_0;
all_led[LED_3].reg.blue = GPIO_P0_1;
//led 2
all_led[LED_2].reg.red = GPIO_P1_0;
all_led[LED_2].reg.green = GPIO_P1_1;
all_led[LED_2].reg.blue = GPIO_P1_2;
}於是乎，原本雜亂不堪的程式碼，瞬間就高大上了啊，哈哈~