u8g2是一个十分优秀的单色屏幕图形库，今天来把他移植到AI-M61-32s上。
一、硬件i2c初步了解
i2c 传输时需要填充的信息
struct bflb_i2c_msg_s {
uint16_t addr;
uint16_t flags;
uint8_t *buffer;
uint16_t length;
};
flags可以是以下参数：
#define I2C_M_READ 0x0001
#define I2C_M_TEN 0x0002
#define I2C_M_DMA 0x0004
#define I2C_M_NOSTOP 0x0040
#define I2C_M_NOSTART 0x0080
flags可以是0表示传输，我使用的模式是这个模式。
其他gpio和i2c具体初始化过程可以参考这篇文章。
二、u8g2移植过程
1，源码获取和处理
olikraus/u8g2: U8glib library for monochrome displays, version 2 (github.com)
首先从上面的链接中获取源码并打开，如下图：
打开其中的csrc文件夹。
我们移植仅需要i2c屏幕部分，可以把不需要的源码删除。
屏幕驱动芯片是ssd1306，我们把u8x8_d_ssd1306_128x64_noname.c文件以外的其他类似于这样的驱动文件删除。
最后得到的是以下结果：
仅保留u8x8_d_ssd1306_128x64_noname.c文件。
2，移植源码
将上面得代码文件复制到工程文件中，并把他们放入一个新建的文件夹中。
如下图所示，我把代码文件放入到了u8g2中。
编写Cmakelist.txt文件，把头文件和源文件加进来。
cmake_minimum_required(VERSION 3.15)
include(proj.conf)
find_package(bouffalo_sdk REQUIRED HINTS $ENV{BL_SDK_BASE})
file(GLOB_RECURSE sources "${CMAKE_CURRENT_SOURCE_DIR}/u8g2/*.c")
sdk_add_compile_definitions(-DCONFIG_CLI_CMD_ENABLE)
sdk_add_include_directories(.)
sdk_add_include_directories(u8g2)
target_sources(app PRIVATE ${sources})
sdk_set_main_file(main.c)
project(helloworld)
3，初始化
首先将头文件引入。
初始化需要我们实现三个函数，这三个函数如下：
void i2c_transfer(uint8_t addr, size_t len, uint8_t *buffer);
uint8_t u8x8_gpio_and_delay_template(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
uint8_t u8x8_byte_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
我们先实现最简单的**u8x8_gpio_and_delay_template函数。我们只需要在case U8X8_MSG_DELAY_10MICRO:和case U8X8_MSG_DELAY_MILLI:**后添加两个延时函数即可。代码如下
uint8_t u8x8_gpio_and_delay_template(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
switch (msg)
{
case U8X8_MSG_GPIO_AND_DELAY_INIT: // called once during init phase of u8g2/u8x8
break; // can be used to setup pins
case U8X8_MSG_DELAY_NANO: // delay arg_int * 1 nano second
break;
case U8X8_MSG_DELAY_100NANO: // delay arg_int * 100 nano seconds
break;
case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
bflb_mtimer_delay_us(10 * arg_int);//第一个填充
break;
case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
bflb_mtimer_delay_ms(arg_int);//第二个填充
break;
case U8X8_MSG_DELAY_I2C: // arg_int is the I2C speed in 100KHz, e.g. 4 = 400 KHz
break; // arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us
case U8X8_MSG_GPIO_D0: // D0 or SPI clock pin: Output level in arg_int
// case U8X8_MSG_GPIO_SPI_CLOCK:
break;
case U8X8_MSG_GPIO_D1: // D1 or SPI data pin: Output level in arg_int
// case U8X8_MSG_GPIO_SPI_DATA:
break;
case U8X8_MSG_GPIO_D2: // D2 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D3: // D3 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D4: // D4 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D5: // D5 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D6: // D6 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D7: // D7 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_E: // E/WR pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS: // CS (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_DC: // DC (data/cmd, A0, register select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_RESET: // Reset pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS1: // CS1 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS2: // CS2 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_I2C_CLOCK: // arg_int=0: Output low at I2C clock pin
break; // arg_int=1: Input dir with pullup high for I2C clock pin
case U8X8_MSG_GPIO_I2C_DATA: // arg_int=0: Output low at I2C data pin
break; // arg_int=1: Input dir with pullup high for I2C data pin
case U8X8_MSG_GPIO_MENU_SELECT:
u8x8_SetGPIOResult(u8x8, /* get menu select pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_NEXT:
u8x8_SetGPIOResult(u8x8, /* get menu next pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_PREV:
u8x8_SetGPIOResult(u8x8, /* get menu prev pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_HOME:
u8x8_SetGPIOResult(u8x8, /* get menu home pin state */ 0);
break;
default:
u8x8_SetGPIOResult(u8x8, 1); // default return value
break;
}
return 1;
}
再实现u8x8_byte_i2c函数。我们要补充的部分是i2c初始化和i2c传输部分。在case U8X8_MSG_BYTE_INIT:后添加i2c初始部分。实现 case U8X8_MSG_BYTE_END_TRANSFER:后的i2c_transfer(u8x8_GetI2CAddress(u8x8) >> 1, buf_idx, buffer);函数。
代码如下：
uint8_t u8x8_byte_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
struct bflb_device_s *gpio;
static uint8_t buffer[32]; /* u8g2/u8x8 will never send more than 32 bytes between START_TRANSFER and END_TRANSFER */
static uint8_t buf_idx;
uint8_t *data;
switch (msg)
{
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *)arg_ptr;
while (arg_int > 0)
{
buffer[buf_idx++] = *data;
data++;
arg_int--;
}
break;
case U8X8_MSG_BYTE_INIT:
/* add your custom code to init i2c subsystem */
gpio = bflb_device_get_by_name("gpio");
/* I2C0_SCL */
bflb_gpio_init(gpio, GPIO_PIN_0, GPIO_FUNC_I2C0 | GPIO_ALTERNATE | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_1);
/* I2C0_SDA */
bflb_gpio_init(gpio, GPIO_PIN_1, GPIO_FUNC_I2C0 | GPIO_ALTERNATE | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_1);
i2c0 = bflb_device_get_by_name("i2c0");
bflb_i2c_init(i2c0, 400000);
break;
case U8X8_MSG_BYTE_SET_DC:
/* ignored for i2c */
break;
case U8X8_MSG_BYTE_START_TRANSFER:
buf_idx = 0;
break;
case U8X8_MSG_BYTE_END_TRANSFER:
i2c_transfer(u8x8_GetI2CAddress(u8x8) >> 1, buf_idx, buffer);
break;
default:
return 0;
}
return 1;
}
void i2c_transfer(uint8_t addr, size_t len, uint8_t *buffer)
{
struct bflb_i2c_msg_s msgs;
msgs.addr = addr;
msgs.flags = 0;
msgs.buffer = buffer;
msgs.length = len;
bflb_i2c_transfer(i2c0, &msgs, 1);
}
注意：这里使用的gpio和i2c0**都是全局变量，平时写代码还是不要这么写。
之后就可以在主函数中初始化了。
**首先定义一个句柄**u8g2
我们主要调u8g2_Setup_ssd1306_i2c_128x64_noname_f(&u8g2,U8G2_R0,u8x8_byte_i2c,u8x8_gpio_and_delay_template);
u8g2_InitDisplay(&u8g2);
u8g2_SetPowerSave(&u8g2, 0);
三个函数。
主函数代码如下：
int main(void)
{
board_init();
u8g2_Setup_ssd1306_i2c_128x64_noname_f(&u8g2, U8G2_R0, u8x8_byte_i2c, u8x8_gpio_and_delay_template);
u8g2_InitDisplay(&u8g2);//初始化显示
u8g2_SetPowerSave(&u8g2, 0);//关闭省电
gpio = bflb_device_get_by_name("gpio");
bflb_gpio_init(gpio, GPIO_PIN_12, GPIO_OUTPUT | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_0);
bflb_gpio_init(gpio, GPIO_PIN_14, GPIO_OUTPUT | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_0);
bflb_gpio_init(gpio, GPIO_PIN_15, GPIO_OUTPUT | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_0);
bflb_gpio_reset(gpio, GPIO_PIN_12);
bflb_gpio_reset(gpio, GPIO_PIN_14);
bflb_gpio_reset(gpio, GPIO_PIN_15);
bflb_gpio_set(gpio, GPIO_PIN_12);
u8g2_SetContrast(&u8g2,50);//亮度设置
while (1)
{
u8g2_ClearBuffer(&u8g2);
//u8g2_DrawBox(&u8g2, 0, 0, 128, 64);
//LOG_F("2");
u8g2_SetFont(&u8g2,u8g2_font_wqy12_t_chinese3);
for(int i=1;i<=4;i++){
u8g2_DrawUTF8(&u8g2,0, i *16-1, "安信可");
}
//u8g2_DrawGlyph(&u8g2,5, 20, 0x2603);
//u8g2_DrawGlyph(&u8g2,31, 20, 0x23f0);
u8g2_SendBuffer(&u8g2);
//LOG_F("3");
}
}
4，效果
5，主函数代码
要是想快速移植，就把代码文件处理好，并写好cmakelist.txt，再将下面的main.c文件复制进自己的主函数文件中即可。
#include "bflb_mtimer.h"
#include "board.h"
#include "bflb_gpio.h"
#include "bflb_i2c.h"
#define DBG_TAG "MAIN"
#include "log.h"
#include "u8g2.h"
struct bflb_device_s *gpio;
u8g2_t u8g2;
static struct bflb_device_s *i2c0;
void i2c_transfer(uint8_t addr, size_t len, uint8_t *buffer)
{
struct bflb_i2c_msg_s msgs;
msgs.addr = addr;
msgs.flags = 0;
msgs.buffer = buffer;
msgs.length = len;
bflb_i2c_transfer(i2c0, &msgs, 1);
}
uint8_t u8x8_gpio_and_delay_template(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
switch (msg)
{
case U8X8_MSG_GPIO_AND_DELAY_INIT: // called once during init phase of u8g2/u8x8
break; // can be used to setup pins
case U8X8_MSG_DELAY_NANO: // delay arg_int * 1 nano second
break;
case U8X8_MSG_DELAY_100NANO: // delay arg_int * 100 nano seconds
break;
case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
bflb_mtimer_delay_us(10 * arg_int);
break;
case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
bflb_mtimer_delay_ms(arg_int);
break;
case U8X8_MSG_DELAY_I2C: // arg_int is the I2C speed in 100KHz, e.g. 4 = 400 KHz
break; // arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us
case U8X8_MSG_GPIO_D0: // D0 or SPI clock pin: Output level in arg_int
// case U8X8_MSG_GPIO_SPI_CLOCK:
break;
case U8X8_MSG_GPIO_D1: // D1 or SPI data pin: Output level in arg_int
// case U8X8_MSG_GPIO_SPI_DATA:
break;
case U8X8_MSG_GPIO_D2: // D2 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D3: // D3 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D4: // D4 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D5: // D5 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D6: // D6 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D7: // D7 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_E: // E/WR pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS: // CS (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_DC: // DC (data/cmd, A0, register select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_RESET: // Reset pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS1: // CS1 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS2: // CS2 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_I2C_CLOCK: // arg_int=0: Output low at I2C clock pin
break; // arg_int=1: Input dir with pullup high for I2C clock pin
case U8X8_MSG_GPIO_I2C_DATA: // arg_int=0: Output low at I2C data pin
break; // arg_int=1: Input dir with pullup high for I2C data pin
case U8X8_MSG_GPIO_MENU_SELECT:
u8x8_SetGPIOResult(u8x8, /* get menu select pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_NEXT:
u8x8_SetGPIOResult(u8x8, /* get menu next pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_PREV:
u8x8_SetGPIOResult(u8x8, /* get menu prev pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_HOME:
u8x8_SetGPIOResult(u8x8, /* get menu home pin state */ 0);
break;
default:
u8x8_SetGPIOResult(u8x8, 1); // default return value
break;
}
return 1;
}
uint8_t u8x8_byte_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
struct bflb_device_s *gpio;
static uint8_t buffer[32]; /* u8g2/u8x8 will never send more than 32 bytes between START_TRANSFER and END_TRANSFER */
static uint8_t buf_idx;
uint8_t *data;
switch (msg)
{
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *)arg_ptr;
while (arg_int > 0)
{
buffer[buf_idx++] = *data;
data++;
arg_int--;
}
break;
case U8X8_MSG_BYTE_INIT:
/* add your custom code to init i2c subsystem */
gpio = bflb_device_get_by_name("gpio");
/* I2C0_SCL */
bflb_gpio_init(gpio, GPIO_PIN_0, GPIO_FUNC_I2C0 | GPIO_ALTERNATE | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_1);
/* I2C0_SDA */
bflb_gpio_init(gpio, GPIO_PIN_1, GPIO_FUNC_I2C0 | GPIO_ALTERNATE | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_1);
i2c0 = bflb_device_get_by_name("i2c0");
bflb_i2c_init(i2c0, 400000);
break;
case U8X8_MSG_BYTE_SET_DC:
/* ignored for i2c */
break;
case U8X8_MSG_BYTE_START_TRANSFER:
buf_idx = 0;
break;
case U8X8_MSG_BYTE_END_TRANSFER:
i2c_transfer(u8x8_GetI2CAddress(u8x8) >> 1, buf_idx, buffer);
break;
default:
return 0;
}
return 1;
}
int main(void)
{
board_init();
u8g2_Setup_ssd1306_i2c_128x64_noname_f(&u8g2, U8G2_R0, u8x8_byte_i2c, u8x8_gpio_and_delay_template);
u8g2_InitDisplay(&u8g2);
u8g2_SetPowerSave(&u8g2, 0);
gpio = bflb_device_get_by_name("gpio");
bflb_gpio_init(gpio, GPIO_PIN_12, GPIO_OUTPUT | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_0);
bflb_gpio_init(gpio, GPIO_PIN_14, GPIO_OUTPUT | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_0);
bflb_gpio_init(gpio, GPIO_PIN_15, GPIO_OUTPUT | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_0);
bflb_gpio_reset(gpio, GPIO_PIN_12);
bflb_gpio_reset(gpio, GPIO_PIN_14);
bflb_gpio_reset(gpio, GPIO_PIN_15);
bflb_gpio_set(gpio, GPIO_PIN_12);//点亮红灯
u8g2_SetContrast(&u8g2,50);//亮度设置
while (1)
{
u8g2_ClearBuffer(&u8g2);
//u8g2_DrawBox(&u8g2, 0, 0, 128, 64);
//LOG_F("2");
u8g2_SetFont(&u8g2,u8g2_font_wqy12_t_chinese3);
for(int i=1;i<=4;i++){
u8g2_DrawUTF8(&u8g2,0, i *16-1, "安信可");
}
//u8g2_DrawGlyph(&u8g2,5, 20, 0x2603);
//u8g2_DrawGlyph(&u8g2,31, 20, 0x23f0);
u8g2_SendBuffer(&u8g2);
//LOG_F("3");
}
}
三、总结
具体函数api在github上，写的十分详细，可以自行查看尝试。
最近考试很多，拖了好久才把这篇文章写完，今天总算是把他写完了。
