system：Android 8.1
platform：RK3326/PX30
uboot
kernel
Android 8.1 关机充电动画（一）模式选择
Android 8.1 关机充电动画（二）Uboot模式
Android 8.1 关机充电动画（三）Android模式
前言
这部分要涉及到uboot下关机充电动画的定制，属于比较low level的部分，所以代码修改的部分不大，在uboot中主要是对多张图片进行轮播，所以这里的主要工作是定位到相应的代码以及如何定制自己的动画。
相关文档
RK在uboot的开发方面已经给出了文档，
其中已经包括了这部分动画如何打包到rom中，不可避免的是需要重新编译uboot，但是图片会被打包到resource.img中。
相关代码
重新回到代码中u-boot/drivers/power/charge_animation.c
struct charge_image {
const char *name;
int soc;
int period; /* ms */
};
/*
* IF you want to use your own charge images, please:
*
* 1. Update the following 'image[]' to point to your own images;
* 2. You must set the failed image as last one and soc = -1 !!!
*/
static const struct charge_image image[] = {
{ .name = "battery_0.bmp", .soc = 5, .period = 600 },
{ .name = "battery_1.bmp", .soc = 20, .period = 600 },
{ .name = "battery_2.bmp", .soc = 40, .period = 600 },
{ .name = "battery_3.bmp", .soc = 60, .period = 600 },
{ .name = "battery_4.bmp", .soc = 80, .period = 600 },
{ .name = "battery_5.bmp", .soc = 100, .period = 600 },
{ .name = "battery_fail.bmp", .soc = -1, .period = 1000 },
};
name：文件名soc：图片对应的电量百分比period：图片显示的时间（单位：ms）
那么，这里问题来了，图片如何打包到固件里呢？
- 先找到RK提供的打包用的脚本，u-boot/pack_resource.sh
- 找到需要打包的图片，然后需要修改的直接替换掉，图片采用8bit或24bit bmp格式，图片路径：u-boot/tools/images/，如下图所示：
- 最终就是如何打包图片了：
cd u-boot && ./pack_resource.sh ../kernel/resource.img
执行完以上命令后，终端会输出以下信息，说明打包成功；
Pack ./tools/images/ & resource.img to resource.img ...
Unpacking old image(resource.img):
rk-kernel.dtb battery_1.bmp battery_2.bmp battery_3.bmp battery_4.bmp battery_5.bmp battery_fail.bmp logo.bmp logo_kernel.bmp battery_0.bmp
Pack to resource.img successed!
Packed resources:
rk-kernel.dtb battery_1.bmp battery_2.bmp battery_3.bmp battery_4.bmp battery_5.bmp battery_fail.bmp logo.bmp logo_kernel.bmp battery_0.bmp
resource.img is packed ready
并且会在当前的路径下重新生成resource.img，将这个文件重新烧写到设备的对应分区，就可以把充电动画打包到设备的rom中了。
总结
简单介绍了RK平台上进行关机充电uboot模式下充电动画的定制和打包方法，篇幅较短，也可以参考RK官方的文档，下一篇介绍一下，关机充电Android模式下如何进行充电动画的修改。附录是充电动画显示的主要代码。
附录
下面的代码是函数static int charge_animation_show(struct udevice *dev)中的while(1)，这里会一直循环显示充电图片；
/* Charging ! */
while (1) {
/*
* At the most time, fuel gauge is usually a i2c device, we
* should avoid read/write all the time. We had better set
* poll seconds to update fuel gauge info.
*/
if (!first_poll_fg && get_timer(delta) < FUEL_GAUGE_POLL_MS)
goto show_images;
delta = get_timer(0);
debug("step1 (%d)...
", screen_on);
/*
* Most fuel gauge is I2C interface, it shouldn't be interrupted
* during tansfer. The power key event depends on interrupt, so
* so we should disable local irq when update fuel gauge.
*/
local_irq_disable();
/* Step1: Is charging now ? */
charging = fuel_gauge_get_chrg_online(fg);
if (charging <= 0) {
printf("Not charging, online=%d. Shutdown...
",
charging);
/* wait uart flush before shutdown */
mdelay(5);
/* PMIC shutdown */
pmic_shutdown(pmic);
printf("Cpu should never reach here, shutdown failed !
");
continue;
}
debug("step2 (%d)... show_idx=%d
", screen_on, show_idx);
/* Step2: get soc and voltage */
soc = fuel_gauge_get_soc(fg);
if (soc < 0 || soc > 100) {
printf("get soc failed: %d
", soc);
continue;
}
voltage = fuel_gauge_get_voltage(fg);
if (voltage < 0) {
printf("get voltage failed: %d
", voltage);
continue;
}
current = fuel_gauge_get_current(fg);
if (current == -ENOSYS) {
printf("get current failed: %d
", current);
continue;
}
first_poll_fg = 0;
local_irq_enable();
show_images:
/*
* Just for debug, otherwise there will be nothing output which
* is not good to know what happen.
*/
if (!debug_start)
debug_start = get_timer(0);
if (get_timer(debug_start) > 20000) {
debug_start = get_timer(0);
printf("[%8ld]: soc=%d%%, vol=%dmv, c=%dma, online=%d, screen_on=%d
",
get_timer(0)/1000, soc, voltage,
current, charging, screen_on);
}
/*
* If ever lowpower screen off, force screen_on=false, which
* means key event can't modify screen_on, only voltage higher
* then threshold can update screen_on=true;
*/
if (ever_lowpower_screen_off)
screen_on = false;
/*
* Auto turn on screen when voltage higher than Vol screen on.
* 'ever_lowpower_screen_off' means enter while loop with
* screen off.
*/
if ((ever_lowpower_screen_off) &&
(voltage > pdata->screen_on_voltage)) {
ever_lowpower_screen_off = false;
screen_on = true;
show_idx = IMAGE_SHOW_RESET;
}
/*
* IMAGE_SHOW_RESET means show_idx show be update by start_idx.
* When short key pressed event trigged, we will set show_idx
* as IMAGE_SHOW_RESET which updates images index from start_idx
* that calculate by current soc.
*/
if (show_idx == IMAGE_SHOW_RESET) {
for (i = 0; i < image_num - 2; i++) {
/* Find out which image we start to show */
if ((soc >= image[i].soc) &&
(soc < image[i + 1].soc)) {
start_idx = i;
break;
}
if (soc >= 100) {
start_idx = image_num - 2;
break;
}
}
debug("%s: show_idx=%d, screen_on=%d
",
__func__, show_idx, screen_on);
/* Mark start index and start time */
show_idx = start_idx;
show_start = get_timer(0);
}
debug("step3 (%d)... show_idx=%d
", screen_on, show_idx);
/* Step3: show images */
if (screen_on) {
/* Don't call 'charge_show_bmp' unless image changed */
if (old_show_idx != show_idx) {
old_show_idx = show_idx;
debug("SHOW: %s
", image[show_idx].name);
charge_show_bmp(image[show_idx].name);
}
/* Re calculate timeout to off screen */
if (priv->auto_screen_off_timeout == 0)
priv->auto_screen_off_timeout = get_timer(0);
} else {
priv->auto_screen_off_timeout = 0;
system_suspend_enter(pdata);
}
mdelay(5);
/* Every image shows period */
if (get_timer(show_start) > image[show_idx].period) {
show_start = get_timer(0);
/* Update to next image */
show_idx++;
if (show_idx > (image_num - 2))
show_idx = IMAGE_SHOW_RESET;
}
debug("step4 (%d)...
", screen_on);
/*
* Step4: check key event.
*
* Short key event: turn on/off screen;
* Long key event: show logo and boot system or still charging.
*/
key_state = check_key_press(dev);
if (key_state == KEY_PRESS_DOWN) {
old_show_idx = IMAGE_SHOW_RESET;
/* NULL means show nothing, ie. turn off screen */
if (screen_on)
charge_show_bmp(NULL);
/*
* Clear current image index, and show image
* from start_idx
*/
show_idx = IMAGE_SHOW_RESET;
/*
* We turn off screen by charge_show_bmp(NULL), so we
* should tell while loop to stop show images any more.
*
* If screen_on=false, means this short key pressed
* event turn on the screen and we need show images.
*
* If screen_on=true, means this short key pressed
* event turn off the screen and we never show images.
*/
if (screen_on)
screen_on = false;
else
screen_on = true;
} else if (key_state == KEY_PRESS_LONG_DOWN) {
/* Only long pressed while screen off needs screen_on true */
if (!screen_on)
screen_on = true;
/* Is able to boot now ? */
if (soc < pdata->exit_charge_level) {
printf("soc=%d%%, threshold soc=%d%%
",
soc, pdata->exit_charge_level);
printf("Low power, unable to boot, charging...
");
show_idx = image_num - 1;
continue;
}
if (voltage < pdata->exit_charge_voltage) {
printf("voltage=%dmv, threshold voltage=%dmv
",
voltage, pdata->exit_charge_voltage);
printf("Low power, unable to boot, charging...
");
show_idx = image_num - 1;
continue;
}
/* Success exit charging */
printf("Exit charge animation...
");
charge_show_logo();
break;
} else {
/* Do nothing */
}
debug("step5 (%d)...
", screen_on);
/* Step5: Exit by ctrl+c */
if (ctrlc()) {
if (voltage >= pdata->screen_on_voltage)
charge_show_logo();
printf("Exit charge, due to ctrl+c
");
break;
}
}