【庆典三：项目速成设计】MCXN947之LCD显示

yinwuqing · 发表于 2024-12-21 19:10:37

本帖最后由 yinwuqing 于 2024-12-21 19:18 编辑

一、简介
前段时间参加了安富利与与非网联合举办的NXP FRDM-MCXN947评测活动，该开发板的性能与外设接口都比较优秀，该开发板更合适开发神经网络单元的应用，板上MCU丝印：MCXN947VCTA，官方提供的资料是基于MCXN947VDFT的，两者相差不大，都属于双核架构，搭载Arm Cortex-M33内核，主频高达150MHz。开发板的资源框架如下：
框架.png

二、屏接口介绍
论坛上有许多小伙伴使用配套的LCD去实现LVGL图形显示，由于板上有预留的J8插座是专门针对LCD模块的，因此有了配套的LCD模块就很好验证官方提供的demo示例了。这里简介驱动SPI串口屏，此屏是基于ST7735S的，ST7735S是用于262K彩色图形型TFT-LCD的单芯片控制器/驱动器。由396条组成源极线和162个栅极线驱动电路。
此屏是笔者在得捷电子商城上购买的，AFL128160A0-1.77N12NTM-ANO，屏为1.77寸，分辨率128*160。模块有预留触摸功能部分的电路，开发者可自行购买相对于TP IC。这里我们只是简单驱动显示，因此只需连接SPI这部分接口。硬件连接如下图：
接线.jpg

正如上图所示，我们用到8根杜邦线，都集成在J8接口上，对应关系如下：
接口原理图.png

ST7735STFT-LCD屏                FRDM-MCXN947开发板
VCC                                        P3V3
GND                                        GND
SCLK                                        P4_1(SCL)
MOSI                                     P4_0(SDA)
DC(Data/Command)             P0_7
CS(Chip Select)                      P0_12
BLK(Backlight)                      P4_5
RES                                        P4_7

三、参考代码
pin_mux.c

#include "fsl_common.h"
#include "fsl_port.h"
#include "fsl_gpio.h"
#include "pin_mux.h"
void BOARD_InitBootPins(void)
{
BOARD_InitPins();
}
void BOARD_InitPins(void)
{
/* Enables the clock for PORT0 controller: Enables clock */
CLOCK_EnableClock(kCLOCK_Port0);
/* Enables the clock for PORT1 controller: Enables clock */
CLOCK_EnableClock(kCLOCK_Port1);
CLOCK_EnableClock(kCLOCK_Port4);
gpio_pin_config_t LCD_GPIO_config0 = {
.pinDirection = kGPIO_DigitalOutput,
.outputLogic = 0U,
};
gpio_pin_config_t LCD_GPIO_config1 = {
.pinDirection = kGPIO_DigitalOutput,
.outputLogic = 1U,
};
GPIO_PinInit(GPIO0, 7U, &LCD_GPIO_config0);
GPIO_PinInit(GPIO0, 12U, &LCD_GPIO_config0);
GPIO_PinInit(GPIO4, 0U, &LCD_GPIO_config0);
GPIO_PinInit(GPIO4, 1U, &LCD_GPIO_config0);
GPIO_PinInit(GPIO4, 5U, &LCD_GPIO_config0);
GPIO_PinInit(GPIO4, 7U, &LCD_GPIO_config0);
PORT_SetPinMux(PORT0, 7U, kPORT_MuxAlt0);
PORT_SetPinMux(PORT0, 12U,kPORT_MuxAlt0);
PORT_SetPinMux(PORT4, 0U, kPORT_MuxAlt0);
PORT_SetPinMux(PORT4, 1U, kPORT_MuxAlt0);
PORT_SetPinMux(PORT4, 5U, kPORT_MuxAlt0);
PORT_SetPinMux(PORT4, 7U, kPORT_MuxAlt0);
const port_pin_config_t port0_7_config = {/* Internal pull-up/down resistor is disabled */
kPORT_PullDisable,
/* Low internal pull resistor value is selected. */
kPORT_LowPullResistor,
/* Fast slew rate is configured */
kPORT_FastSlewRate,
/* Passive input filter is disabled */
kPORT_PassiveFilterDisable,
/* Open drain output is disabled */
kPORT_OpenDrainDisable,
/* Low drive strength is configured */
kPORT_LowDriveStrength,
/* Pin is configured as PIO0_10 */
kPORT_MuxAlt0,
/* Digital input enabled */
kPORT_InputBufferEnable,
/* Digital input is not inverted */
kPORT_InputNormal,
/* Pin Control Register fields [15:0] are not locked */
kPORT_UnlockRegister};
const port_pin_config_t port0_10_pinB12_config = {/* Internal pull-up/down resistor is disabled */
kPORT_PullDisable,
/* Low internal pull resistor value is selected. */
kPORT_LowPullResistor,
/* Fast slew rate is configured */
kPORT_FastSlewRate,
/* Passive input filter is disabled */
kPORT_PassiveFilterDisable,
/* Open drain output is disabled */
kPORT_OpenDrainDisable,
/* Low drive strength is configured */
kPORT_LowDriveStrength,
/* Pin is configured as PIO0_10 */
kPORT_MuxAlt0,
/* Digital input enabled */
kPORT_InputBufferEnable,
/* Digital input is not inverted */
kPORT_InputNormal,
/* Pin Control Register fields [15:0] are not locked */
kPORT_UnlockRegister};
/* PORT0_10 (pin B12) is configured as PIO0_10 */
PORT_SetPinConfig(PORT0, 10U, &port0_10_pinB12_config);
const port_pin_config_t port0_27_pinE10_config = {/* Internal pull-up/down resistor is disabled */
kPORT_PullDisable,
/* Low internal pull resistor value is selected. */
kPORT_LowPullResistor,
/* Fast slew rate is configured */
kPORT_FastSlewRate,
/* Passive input filter is disabled */
kPORT_PassiveFilterDisable,
/* Open drain output is disabled */
kPORT_OpenDrainDisable,
/* Low drive strength is configured */
kPORT_LowDriveStrength,
/* Pin is configured as PIO0_27 */
kPORT_MuxAlt0,
/* Digital input enabled */
kPORT_InputBufferEnable,
/* Digital input is not inverted */
kPORT_InputNormal,
/* Pin Control Register fields [15:0] are not locked */
kPORT_UnlockRegister};
/* PORT0_27 (pin E10) is configured as PIO0_27 */
PORT_SetPinConfig(PORT0, 27U, &port0_27_pinE10_config);
const port_pin_config_t port1_2_pinC04_config = {/* Internal pull-up/down resistor is disabled */
kPORT_PullDisable,
/* Low internal pull resistor value is selected. */
kPORT_LowPullResistor,
/* Fast slew rate is configured */
kPORT_FastSlewRate,
/* Passive input filter is disabled */
kPORT_PassiveFilterDisable,
/* Open drain output is disabled */
kPORT_OpenDrainDisable,
/* Low drive strength is configured */
kPORT_LowDriveStrength,
/* Pin is configured as PIO1_2 */
kPORT_MuxAlt0,
/* Digital input enabled */
kPORT_InputBufferEnable,
/* Digital input is not inverted */
kPORT_InputNormal,
/* Pin Control Register fields [15:0] are not locked */
kPORT_UnlockRegister};
/* PORT1_2 (pin C04) is configured as PIO1_2 */
PORT_SetPinConfig(PORT1, 2U, &port1_2_pinC04_config);
const port_pin_config_t port0_2_pinB16_config = {/* Internal pull-up/down resistor is disabled */
kPORT_PullDisable,
/* Low internal pull resistor value is selected. */
kPORT_LowPullResistor,
/* Fast slew rate is configured */
kPORT_FastSlewRate,
/* Passive input filter is disabled */
kPORT_PassiveFilterDisable,
/* Open drain output is disabled */
kPORT_OpenDrainDisable,
/* High drive strength is configured */
kPORT_HighDriveStrength,
/* Pin is configured as SWO */
kPORT_MuxAlt1,
/* Digital input enabled */
kPORT_InputBufferEnable,
/* Digital input is not inverted */
kPORT_InputNormal,
/* Pin Control Register fields [15:0] are not locked */
kPORT_UnlockRegister};
/* PORT0_2 (pin B16) is configured as SWO */
PORT_SetPinConfig(PORT0, 2U, &port0_2_pinB16_config);
PORT_SetPinConfig(PORT0, 7U, &port0_7_config);
PORT_SetPinConfig(PORT0, 12U,&port0_7_config);
PORT_SetPinConfig(PORT4, 0U, &port0_7_config);
PORT_SetPinConfig(PORT4, 1U, &port0_7_config);
PORT_SetPinConfig(PORT4, 5U, &port0_7_config);
PORT_SetPinConfig(PORT4, 7U, &port0_7_config);
}

复制代码

void LCD_Init(void)
{
LCD_RES_Clr();
SysTick_DelayTicks(1000);
LCD_RES_Set();
SysTick_DelayTicks(1000);
LCD_BLK_Set();
SysTick_DelayTicks(120000);
LCD_WR_REG(0x11); //Sleep out
SysTick_DelayTicks(120000); //Delay 120ms
LCD_WR_REG(0xB1);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_REG(0xB2);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_REG(0xB3);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_REG(0xB4); //Dot inversion
LCD_WR_DATA8(0x03);
LCD_WR_REG(0xC0);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x08);
LCD_WR_DATA8(0x04);
LCD_WR_REG(0xC1);
LCD_WR_DATA8(0XC0);
LCD_WR_REG(0xC2);
LCD_WR_DATA8(0x0D);
LCD_WR_DATA8(0x00);
LCD_WR_REG(0xC3);
LCD_WR_DATA8(0x8D);
LCD_WR_DATA8(0x2A);
LCD_WR_REG(0xC4);
LCD_WR_DATA8(0x8D);
LCD_WR_DATA8(0xEE);
LCD_WR_REG(0xC5); //VCOM
LCD_WR_DATA8(0x1A);
LCD_WR_REG(0x36); //MX, MY, RGB mode
if(USE_HORIZONTAL==0)LCD_WR_DATA8(0x00);
else if(USE_HORIZONTAL==1)LCD_WR_DATA8(0xC0);
else if(USE_HORIZONTAL==2)LCD_WR_DATA8(0x70);
else LCD_WR_DATA8(0xA0);
LCD_WR_REG(0xE0);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x22);
LCD_WR_DATA8(0x07);
LCD_WR_DATA8(0x0A);
LCD_WR_DATA8(0x2E);
LCD_WR_DATA8(0x30);
LCD_WR_DATA8(0x25);
LCD_WR_DATA8(0x2A);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x26);
LCD_WR_DATA8(0x2E);
LCD_WR_DATA8(0x3A);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x01);
LCD_WR_DATA8(0x03);
LCD_WR_DATA8(0x13);
LCD_WR_REG(0xE1);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x16);
LCD_WR_DATA8(0x06);
LCD_WR_DATA8(0x0D);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x26);
LCD_WR_DATA8(0x23);
LCD_WR_DATA8(0x27);
LCD_WR_DATA8(0x27);
LCD_WR_DATA8(0x25);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x3B);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x01);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x13);
LCD_WR_REG(0x3A); //65k mode
LCD_WR_DATA8(0x05);
LCD_WR_REG(0x29); //Display on
}

复制代码

#include "pin_mux.h"
#include "peripherals.h"
#include "board.h"
#include "pic.h"
#include "lcd_init.h"
typedef struct
{
unsigned char Index[2];
unsigned char Msk[32];
}typFNT_GB16;
/*******************************************************************************
* Prototypes
******************************************************************************/
extern const typFNT_GB16 tfont16[];
/*******************************************************************************
* Variables
******************************************************************************/
volatile uint32_t g_systickCounter;
/*******************************************************************************
* Code
******************************************************************************/
void SysTick_Handler(void)
{
if (g_systickCounter != 0U)
{
g_systickCounter--;
}
}
void SysTick_DelayTicks(uint32_t n)
{
g_systickCounter = n;
while (g_systickCounter != 0U)
{
}
}
void Display_title(void)
{
LCD_Fill(0,0,LCD_W,LCD_H,LIGHTBLUE);
LCD_ShowIntNum(8,10,2024,4,BLUE,GREEN,16);
LCD_ShowChinese(40,10,&tfont16[0],BLUE,GREEN,16,0);
LCD_ShowChinese(56,10,&tfont16[1],BLUE,GREEN,16,0);
LCD_ShowChinese(72,10,&tfont16[2],BLUE,GREEN,16,0);
LCD_ShowChinese(88,10,&tfont16[3],BLUE,GREEN,16,0);
LCD_ShowChinese(104,10,&tfont16[4],BLUE,GREEN,16,0);
LCD_ShowChinese(8,30,&tfont16[5],BLUE,GREEN,16,0);
LCD_ShowChinese(24,30,&tfont16[6],BLUE,GREEN,16,0);
LCD_ShowString(40,30,"MCX",BLUE,GREEN,16,0);
LCD_ShowString(64,30," ",BLUE,GREEN,16,0);
LCD_ShowString(72,30,"N",BLUE,GREEN,16,0);
LCD_ShowString(80,30," ",BLUE,GREEN,16,0);
LCD_ShowChinese(88,30,&tfont16[7],BLUE,GREEN,16,0);
LCD_ShowChinese(104,30,&tfont16[8],BLUE,GREEN,16,0);
LCD_ShowChinese(8,50,&tfont16[9],BLUE,GREEN,16,0);
LCD_ShowChinese(24,50,&tfont16[10],BLUE,GREEN,16,0);
LCD_ShowChinese(40,50,&tfont16[11],BLUE,GREEN,16,0);
LCD_ShowChinese(56,50,&tfont16[12],BLUE,GREEN,16,0);
LCD_ShowChinese(72,50,&tfont16[13],BLUE,GREEN,16,0);
LCD_ShowChinese(88,50,&tfont16[5],BLUE,GREEN,16,0);
LCD_ShowChinese(104,50,&tfont16[14],BLUE,GREEN,16,0);
LCD_ShowChinese(8,70,&tfont16[15],BLUE,GREEN,16,0);
LCD_ShowChinese(24,70,&tfont16[16],BLUE,GREEN,16,0);
LCD_ShowString(44,140,"2024-12-20",BLUE,GREEN,16,0);
SysTick_DelayTicks(500000);
}
/*!
* @brief Main function
*/
int main(void)
{
CLOCK_EnableClock(kCLOCK_Gpio0);
CLOCK_EnableClock(kCLOCK_Gpio1);
CLOCK_EnableClock(kCLOCK_Gpio4);
BOARD_InitPins();
LED_RED_INIT(LOGIC_LED_OFF);
LED_BLUE_INIT(LOGIC_LED_OFF);
LED_GREEN_INIT(LOGIC_LED_OFF);
/* Set systick reload value to generate 1ms interrupt */
if (SysTick_Config(SystemCoreClock / 1000000U))
{
while (1)
{
}
}
LCD_Init();
SysTick_DelayTicks(200U);
LCD_Fill(0,0,LCD_W,LCD_H,YELLOW);
SysTick_DelayTicks(200);
LCD_Fill(0,0,LCD_W,LCD_H,WHITE);
while (1)
{
LCD_ShowPicture(0,0,128,160,gImage_1);
SysTick_DelayTicks(500000);
Display_title();
LCD_Fill(0,0,LCD_W,LCD_H,WHITE);
LCD_ShowPicture(0,0,91,160,gImage_2);
SysTick_DelayTicks(500000);
}
}

复制代码

四、显示效果
画的bmp图使用Img2Lcd工具导出数组。圣诞节快到了，提前祝大伙圣诞节快乐！感谢在2024年里，与论坛的一路同行！
导入图片.png

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