WhyCan Forum(哇酷开发者社区)

摸鱼moyu

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注册时间： 2021-09-18

已发帖子： 41

积分： 41

求助大佬 st7735都有fb0了还不能正常工作啊

[    1.108265] fb_st7735r spi0.0: fbtft_property_value: buswidth = 8
[    1.114547] fb_st7735r spi0.0: fbtft_property_value: debug = 0
[    1.120435] fb_st7735r spi0.0: fbtft_property_value: rotate = 90
[    1.126555] fb_st7735r spi0.0: fbtft_property_value: fps = 60


[    2.188617] Console: switching to colour frame buffer device 10x20
[    2.197506] graphics fb0: fb_st7735r frame buffer, 80x160, 25 KiB video memory, 4 KiB buffer memory, fps=100, spi0.0 at 36 MHz

dev下面都有fb了纳闷了

&spi0 {
	status = "okay"; 
	    st7735r@0{
			compatible = "sitronix,st7735r";
			reg = <0>;
			status = "okay";
			spi-max-frequency = <36000000>;
			spi-cpol;
			spi-cpha;
			rotate = <90>;
			fps = <60>;
			buswidth = <8>;
			dc-gpios = <&pio 3 16 GPIO_ACTIVE_HIGH>;
			reset-gpios = <&pio 3 17 GPIO_ACTIVE_HIGH>;
			led-gpios = <&pio 3 15 GPIO_ACTIVE_LOW>;
			debug = <0x0>;
        };
}; 

按照网上把申请io的地方换了
是不是我还有哪里有没设置

摸鱼moyu

会员

注册时间： 2021-09-18

已发帖子： 41

积分： 41

Re: 求助大佬 st7735都有fb0了还不能正常工作啊

SPI LCD 数据是单向的， soc根本不知道你的lcd是否存在，所以还是要确认lcd有没有坏，时序对不对？

屏幕应该是好的，时序确实了，家里没法看，我还是直接自己写一个看看

摸鱼moyu

会员

注册时间： 2021-09-18

已发帖子： 41

积分： 41

Re: 求助大佬 st7735都有fb0了还不能正常工作啊

又搞了一上午准备放弃自己写了的，最后检查了设备树结果发现spi引脚添加错了
大概操作流程就是先按照这个里面 https://www.bilibili.com/read/cv9947785 把引脚申请改了我用的是5.7.1
然后去fb_st7735r.c里面修改

static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
	 //(xs+24) >> 8, (xs+24) & 0xFF, (xe+24) >> 8, (xe+24) & 0xFF);
		  xs >> 8, (xs+1) & 0xFF, xe >> 8, (xe+1) & 0xFF);

	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
			(ys+25) >> 8, (ys+26) & 0xFF, (ye+25) >> 8, (ye+26) & 0xFF);
		  //ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);

	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
}

static struct fbtft_display display = {
	.regwidth = 8,
	.width = 80,
	.height = 160,
	.init_sequence = default_init_sequence,
	.gamma_num = 2,
	.gamma_len = 16,
	.gamma = DEFAULT_GAMMA,
	.fbtftops = {
		.set_addr_win = set_addr_win,
		.set_var = set_var,
		.set_gamma = set_gamma,
	},
};

下面是设备树里面

&spi0 {
	status = "okay"; 
	pinctrl-names = "default";
	pinctrl-0 = <&spi0_pd_pins>;
	    st7735r@0{
			compatible = "sitronix,st7735r";
			reg = <0>;
			status = "okay";
			spi-max-frequency = <36000000>;
			spi-cpol;
			spi-cpha;
			rotate = <90>;
			fps = <60>;
			buswidth = <8>;
			dc-gpios = <&pio 3 16 GPIO_ACTIVE_HIGH>;
			reset-gpios = <&pio 3 17 GPIO_ACTIVE_HIGH>;
			led-gpios = <&pio 3 15 GPIO_ACTIVE_LOW>;
			debug = <0x0>;
        };
}; 

然后修改bootargs 里面添加console=tty0