【GD32450I-EVAL】板载SDRAM支持LittleVGL

tinnu 发表于 2020-10-6 21:03

此前的程序都是只支持内部RAM，内部RAM对于480*272的屏幕来说终究还是小了点，为了支持整个屏幕，必须开辟480*272*4字节的空间，总共510K，板载芯片尾号IK，只有256K，就算是最大的那个II系列，也只有512K，其余的程序分配2K根本就不够，单论堆栈空间都需要8K。

 

（一）外部SDRAM驱动

GD系列单片机SDRAM的驱动总线叫做EXMC，这个外设还同时支持各种nand flash nor falsh

地址示意：

SDRAM设备支持两个，起始地址分别是0xC0000000和0xD0000000，一个设备竟然有256Mb，一开始觉得这个配置是不是会空余很大的空白地址，后来看了下程序，发现整个256Mb都被使用了才发现。



这颗SDRAM型号是 MT48LC16M16A2P-6AIT ，里面有个16M的字样，一开始理所当然地以为是16M，后来看代码发现不太对，搜了一下才发现是一颗镁光的256M的内存！

 

驱动代码方面没什么值得注意的，因为配置完EXMC之后，就跟操作内部存储的差距不大了，屏蔽了底层，不需要调用什么函数。

驱动代码可以直接引用例程EXMC里面的SDRAM工程代码。

<div aria-label="代码段小部件" contenteditable="false" role="region" tabindex="-1">
<pre data-widget="codesnippet">
<code class="hljs language-cpp">/* Define mode register content */
/* Burst Length */
#define SDRAM_MODEREG_BURST_LENGTH_1 ((uint16_t)0x0000)
#define SDRAM_MODEREG_BURST_LENGTH_2 ((uint16_t)0x0001)
#define SDRAM_MODEREG_BURST_LENGTH_4 ((uint16_t)0x0002)
#define SDRAM_MODEREG_BURST_LENGTH_8 ((uint16_t)0x0003)

/* Burst Type */
#define SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL ((uint16_t)0x0000)
#define SDRAM_MODEREG_BURST_TYPE_INTERLEAVED ((uint16_t)0x0008)

/* CAS Latency */
#define SDRAM_MODEREG_CAS_LATENCY_2 ((uint16_t)0x0020)
#define SDRAM_MODEREG_CAS_LATENCY_3 ((uint16_t)0x0030)

/* Write Mode */
#define SDRAM_MODEREG_WRITEBURST_MODE_PROGRAMMED ((uint16_t)0x0000)
#define SDRAM_MODEREG_WRITEBURST_MODE_SINGLE ((uint16_t)0x0200)

#define SDRAM_MODEREG_OPERATING_MODE_STANDARD ((uint16_t)0x0000)

#define SDRAM_TIMEOUT ((uint32_t)0x0000FFFF)

/*!
\brief sdram peripheral initialize
\paramsdram_device: specifie the SDRAM device
\param none
\retval none
*/
void exmc_synchronous_dynamic_ram_init(uint32_t sdram_device)
{
exmc_sdram_parameter_struct sdram_init_struct;
exmc_sdram_timing_parameter_structsdram_timing_init_struct;
exmc_sdram_command_parameter_struct sdram_command_init_struct;

uint32_t command_content = 0, bank_select;
uint32_t timeout = SDRAM_TIMEOUT;

/* enable EXMC clock*/
rcu_periph_clock_enable(RCU_EXMC);
rcu_periph_clock_enable(RCU_GPIOB);
rcu_periph_clock_enable(RCU_GPIOC);
rcu_periph_clock_enable(RCU_GPIOD);
rcu_periph_clock_enable(RCU_GPIOE);
rcu_periph_clock_enable(RCU_GPIOF);
rcu_periph_clock_enable(RCU_GPIOG);
rcu_periph_clock_enable(RCU_GPIOH);

/* common GPIO configuration */
/* SDNE0(PC2),SDCKE0(PC5) pin configuration */
gpio_af_set(GPIOC, GPIO_AF_12, GPIO_PIN_2 | GPIO_PIN_5);
gpio_mode_set(GPIOC, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_2 | GPIO_PIN_5);
gpio_output_options_set(GPIOC, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_2 | GPIO_PIN_5);

/* D2(PD0),D3(PD1),D13(PD8),D14(PD9),D15(PD10),D0(PD14),D1(PD15) pin configuration */
gpio_af_set(GPIOD, GPIO_AF_12, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_8 | GPIO_PIN_9 |
 GPIO_PIN_10 | GPIO_PIN_14 | GPIO_PIN_15);
gpio_mode_set(GPIOD, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_8 | GPIO_PIN_9 |
 GPIO_PIN_10 | GPIO_PIN_14 | GPIO_PIN_15);
gpio_output_options_set(GPIOD, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_8 | GPIO_PIN_9 |
 GPIO_PIN_10 | GPIO_PIN_14 | GPIO_PIN_15);

/* NBL0(PE0),NBL1(PE1),D4(PE7),D5(PE8),D6(PE9),D7(PE10),D8(PE11),D9(PE12),D10(PE13),D11(PE14),D12(PE15) pin configuration */
gpio_af_set(GPIOE, GPIO_AF_12, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_7| GPIO_PIN_8 |
 GPIO_PIN_9| GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 |
 GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
gpio_mode_set(GPIOE, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_7| GPIO_PIN_8 |
 GPIO_PIN_9| GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 |
 GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
gpio_output_options_set(GPIOE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_7| GPIO_PIN_8 |
 GPIO_PIN_9| GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 |
 GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);

/* A0(PF0),A1(PF1),A2(PF2),A3(PF3),A4(PF4),A5(PF5),NRAS(PF11),A6(PF12),A7(PF13),A8(PF14),A9(PF15) pin configuration */
gpio_af_set(GPIOF, GPIO_AF_12, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_2| GPIO_PIN_3|
 GPIO_PIN_4| GPIO_PIN_5| GPIO_PIN_11 | GPIO_PIN_12 |
 GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
gpio_mode_set(GPIOF, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_2| GPIO_PIN_3|
 GPIO_PIN_4| GPIO_PIN_5| GPIO_PIN_11 | GPIO_PIN_12 |
 GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
gpio_output_options_set(GPIOF, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0| GPIO_PIN_1| GPIO_PIN_2| GPIO_PIN_3|
 GPIO_PIN_4| GPIO_PIN_5| GPIO_PIN_11 | GPIO_PIN_12 |
 GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);

/* A10(PG0),A11(PG1),A12(PG2),A14(PG4),A15(PG5),SDCLK(PG8),NCAS(PG15) pin configuration */
gpio_af_set(GPIOG, GPIO_AF_12, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_4 |
 GPIO_PIN_5 | GPIO_PIN_8 | GPIO_PIN_15);
gpio_mode_set(GPIOG, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_4 |
 GPIO_PIN_5 | GPIO_PIN_8 | GPIO_PIN_15);
gpio_output_options_set(GPIOG, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_4 |
 GPIO_PIN_5 | GPIO_PIN_8 | GPIO_PIN_15);
/* SDNWE(PH5) pin configuration */
gpio_af_set(GPIOH, GPIO_AF_12, GPIO_PIN_5);
gpio_mode_set(GPIOH, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_5);
gpio_output_options_set(GPIOH, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5);

/* specify which SDRAM to read and write */
if(EXMC_SDRAM_DEVICE0 == sdram_device)
{
 bank_select = EXMC_SDRAM_DEVICE0_SELECT;
}
else
{
 bank_select = EXMC_SDRAM_DEVICE1_SELECT;
}

/* EXMC SDRAM device initialization sequence --------------------------------*/
/* Step 1 : configure SDRAM timing registers --------------------------------*/
/* LMRD: 2 clock cycles */
sdram_timing_init_struct.load_mode_register_delay = 2;
/* XSRD: min = 67ns */
sdram_timing_init_struct.exit_selfrefresh_delay = 7;
/* RASD: min=42ns , max=120k (ns) */
sdram_timing_init_struct.row_address_select_delay = 5;
/* ARFD: min=60ns */
sdram_timing_init_struct.auto_refresh_delay = 6;
/* WRD:min=1 Clock cycles +6ns */
sdram_timing_init_struct.write_recovery_delay = 2;
/* RPD:min=18ns */
sdram_timing_init_struct.row_precharge_delay = 2;
/* RCD:min=18ns */
sdram_timing_init_struct.row_to_column_delay = 2;

/* step 2 : configure SDRAM control registers ---------------------------------*/
sdram_init_struct.sdram_device = sdram_device;
sdram_init_struct.column_address_width = EXMC_SDRAM_COW_ADDRESS_9;
sdram_init_struct.row_address_width = EXMC_SDRAM_ROW_ADDRESS_13;
sdram_init_struct.data_width = EXMC_SDRAM_DATABUS_WIDTH_16B;
sdram_init_struct.internal_bank_number = EXMC_SDRAM_4_INTER_BANK;
sdram_init_struct.cas_latency = EXMC_CAS_LATENCY_3_SDCLK;
sdram_init_struct.write_protection = DISABLE;
sdram_init_struct.sdclock_config = EXMC_SDCLK_PERIODS_2_HCLK;
sdram_init_struct.brust_read_switch = ENABLE;
sdram_init_struct.pipeline_read_delay = EXMC_PIPELINE_DELAY_1_HCLK;
sdram_init_struct.timing= &sdram_timing_init_struct;
/* EXMC SDRAM bank initialization */
exmc_sdram_init(&sdram_init_struct);

/* step 3 : configure CKE high command---------------------------------------*/
sdram_command_init_struct.command = EXMC_SDRAM_CLOCK_ENABLE;
sdram_command_init_struct.bank_select = bank_select;
sdram_command_init_struct.auto_refresh_number = EXMC_SDRAM_AUTO_REFLESH_1_SDCLK;
sdram_command_init_struct.mode_register_content = 0;
/* wait until the SDRAM controller is ready */
while((exmc_flag_get(sdram_device, EXMC_SDRAM_FLAG_NREADY) != RESET) && (timeout > 0))
{
 timeout--;
}
/* send the command */
exmc_sdram_command_config(&sdram_command_init_struct);

/* step 4 : insert 10ms delay----------------------------------------------*/
delay_1ms(10);

/* step 5 : configure precharge all command----------------------------------*/
sdram_command_init_struct.command = EXMC_SDRAM_PRECHARGE_ALL;
sdram_command_init_struct.bank_select = bank_select;
sdram_command_init_struct.auto_refresh_number = EXMC_SDRAM_AUTO_REFLESH_1_SDCLK;
sdram_command_init_struct.mode_register_content = 0;
/* wait until the SDRAM controller is ready */
timeout = SDRAM_TIMEOUT;
while((exmc_flag_get(sdram_device, EXMC_SDRAM_FLAG_NREADY) != RESET) && (timeout > 0))
{
 timeout--;
}
/* send the command */
exmc_sdram_command_config(&sdram_command_init_struct);

/* step 6 : configure Auto-Refresh command-----------------------------------*/
sdram_command_init_struct.command = EXMC_SDRAM_AUTO_REFRESH;
sdram_command_init_struct.bank_select = bank_select;
sdram_command_init_struct.auto_refresh_number = EXMC_SDRAM_AUTO_REFLESH_8_SDCLK;
sdram_command_init_struct.mode_register_content = 0;
/* wait until the SDRAM controller is ready */
timeout = SDRAM_TIMEOUT;
while((exmc_flag_get(sdram_device, EXMC_SDRAM_FLAG_NREADY) != RESET) && (timeout > 0))
{
 timeout--;
}
/* send the command */
exmc_sdram_command_config(&sdram_command_init_struct);

/* step 7 : configure load mode register command-----------------------------*/
/* program mode register */
command_content = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_1 |
 SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |
 SDRAM_MODEREG_CAS_LATENCY_3 |
 SDRAM_MODEREG_OPERATING_MODE_STANDARD |
 SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;

sdram_command_init_struct.command = EXMC_SDRAM_LOAD_MODE_REGISTER;
sdram_command_init_struct.bank_select = bank_select;
sdram_command_init_struct.auto_refresh_number = EXMC_SDRAM_AUTO_REFLESH_1_SDCLK;
sdram_command_init_struct.mode_register_content = command_content;

/* wait until the SDRAM controller is ready */
timeout = SDRAM_TIMEOUT;
while((exmc_flag_get(sdram_device, EXMC_SDRAM_FLAG_NREADY) != RESET) && (timeout > 0))
{
 timeout--;
}
/* send the command */
exmc_sdram_command_config(&sdram_command_init_struct);

/* step 8 : set the auto-refresh rate counter--------------------------------*/
/* 64ms, 8192-cycle refresh, 64ms/8192=7.81us */
/* SDCLK_Freq = SYS_Freq/2 */
/* (7.81 us * SDCLK_Freq) - 20 */
exmc_sdram_refresh_count_set(761);

/* wait until the SDRAM controller is ready */
timeout = SDRAM_TIMEOUT;
while((exmc_flag_get(sdram_device, EXMC_SDRAM_FLAG_NREADY) != RESET) && (timeout > 0))
{
 timeout--;
}
}
</code></pre>
<img src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" /><img height="15" role="presentation" src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" title="点击并拖拽以移动" width="15" /></div>

 

（二）将缓冲放到SDRAM中

LittleVGL 和 TLI配置的缓冲区都要修改。

1-配置缓冲地址

定义SDRAM中的地址，初始化中使用了是SDRAM设备0，对应地址为 0xC0000000 

定义地址：

<div aria-label="代码段小部件" contenteditable="false" role="region" tabindex="-1">
<pre data-widget="codesnippet">
<code class="hljs language-cpp">#define EXT_BUFFER0_ADDR 0xC0000000
#define EXT_BUFFER1_ADDR (EXT_BUFFER0_ADDR + LCD_WIDTH * LCD_HEIGHT * 2)</code></pre>
<img src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" /><img height="15" role="presentation" src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" title="点击并拖拽以移动" width="15" /></div>

*2是因为每个像素包含一个RGB565数据，5+6+5是16bit即两个8字节。

 

2-TLI 缓冲区

把TLI初始化中的缓冲位定向到SDRAM的地址中：

<div aria-label="代码段小部件" contenteditable="false" role="region" tabindex="-1">
<pre data-widget="codesnippet">
<code class="hljs language-cpp"> tli_layer_init_struct.layer_frame_bufaddr = (uint32_t)EXT_BUFFER0_ADDR;
tli_layer_init_struct.layer_frame_bufaddr = (uint32_t)EXT_BUFFER1_ADDR;</code></pre>
<img src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" /><img height="15" role="presentation" src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" title="点击并拖拽以移动" width="15" /></div>

删去layer_window_leftpos、layer_window_rightpos、layer_window_toppos、layer_window_bottompos的偏移：

<div aria-label="代码段小部件" contenteditable="false" role="region" tabindex="-1">
<pre data-widget="codesnippet">
<code class="hljs language-cpp"> tli_layer_init_struct.layer_window_leftpos = HORIZONTAL_SYNCHRONOUS_PULSE + HORIZONTAL_BACK_PORCH;
tli_layer_init_struct.layer_window_rightpos = (LCD_WIDTH + HORIZONTAL_SYNCHRONOUS_PULSE + HORIZONTAL_BACK_PORCH - 1);
tli_layer_init_struct.layer_window_toppos = VERTICAL_SYNCHRONOUS_PULSE + VERTICAL_BACK_PORCH;
tli_layer_init_struct.layer_window_bottompos = (LCD_HEIGHT + VERTICAL_SYNCHRONOUS_PULSE + VERTICAL_BACK_PORCH - 1);
</code></pre>
<img src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" /><img height="15" role="presentation" src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" title="点击并拖拽以移动" width="15" /></div>



3-LittleVGL 缓冲

lv_port_disp_init 函数里，首先要在一开始调用EXMC的初始化函数，并且开辟内存：

<div aria-label="代码段小部件" contenteditable="false" role="region" tabindex="-1">
<pre data-widget="codesnippet">
<code class="hljs language-cpp"> exmc_synchronous_dynamic_ram_init(EXMC_SDRAM_DEVICE0);
delay_ms(1);
memset((void *)EXT_BUFFER0_ADDR, 0, LCD_WIDTH * LCD_HEIGHT * LCD_FB_BYTE_PER_PIXEL*2);
memset((void *)EXT_BUFFER1_ADDR, 0, LCD_WIDTH * LCD_HEIGHT * LCD_FB_BYTE_PER_PIXEL*2);
</code></pre>
<img src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" /><img height="15" role="presentation" src="data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==" title="点击并拖拽以移动" width="15" /></div>

重新定向缓冲区：

<pre>
<code class="language-cpp">
static lv_disp_buf_t disp_buf;
lv_disp_buf_init(&disp_buf, EXT_BUFFER0_ADDR, EXT_BUFFER1_ADDR, LCD_WIDTH * LCD_HEIGHT * LCD_FB_BYTE_PER_PIXEL);
disp_drv.buffer = &disp_buf;</code></pre>

 

4-重新配置触摸范围

DEMO_ReadTouch 函数中，把以下两行注释掉：

<pre>
<code class="language-cpp"> // touch_x -= 20;
 // touch_y -= 30;</code></pre>

 

（三）显示效果

对比之前的局部显示效果：

<img _height="360" border="0" src="https://bbs.eeworld.com.cn/data/attachment/forum/202010/06/185738k7ae7i99so7i71he.gif" width="640" />

 

代码：

源码查看本人gitee开源代码：<a href="https://gitee.com/tinnu/littlevgl_gd32f450" target="_blank">LittleVGL_GD32F450</a>

okhxyyo 发表于 2020-10-9 15:48

<a href="https://bbs.eeworld.com.cn/thread-1140981-1-1.html" target="_blank">兆易GD32450I-EVAL</a>

汇总贴：<a href="https://bbs.eeworld.com.cn/thread-1140981-1-1.html">https://bbs.eeworld.com.cn/thread-1140981-1-1.html</a>

老母鸡 发表于 2021-6-15 20:27

楼主您好啊，请问下这个有完整工程能开源一下吗，谢谢了

tinnu 发表于 2021-6-15 23:44

老母鸡发表于 2021-6-15 20:27
楼主您好啊，请问下这个有完整工程能开源一下吗，谢谢了

最后有链接啊……gitee上有，没有工程文件，要自己吧源文件添加

liangbread 发表于 2022-5-31 01:13

请问可以通过407接sdram同时驱动intel8080接口的lcd吗

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【GD32450I-EVAL】板载SDRAM支持LittleVGL