[Qinheng RISC-V core CH582] SPI driver ST7735

lugl4313820

[Qinheng RISC-V core CH582] SPI driver ST7735 [Copy link]

 

[Qinheng RISC-V core CH582] I2C lights up the OLED screen - Domestic chip exchange - Electronic Engineering World - Forum (eeworld.com.cn)

After I2C driving the OLED screen, today we tested the hardware SPI0 driving the ST7735LCD screen.

1. The CH582 chip provides SPI0, and its features are as follows:

• SPI0 supports master mode (Master) and slave mode (Slave).
• Compatible with the Serial Peripheral Interface (SPI) specification.
• Supports Mode 0 and Mode 3 data transmission methods.
• 8-bit data transmission mode, data bit order can be selected: low byte first or high byte first.
• The clock frequency can be up to half of the system main frequency Fsys.
• 8-byte FIFO.
• SPI0 slave mode supports first byte as command mode or data stream mode.
• SPI0 supports DMA, which makes data transmission more efficient.

2. SPI initialization:

The IO of SPI0 are PA12 (NSS), PA13 (SCK), PA14 (MOSI). Today I will drive ST7735 and do not need to receive data, so PA15MISO does not need to be configured.

GPIOA_ModeCfg( GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14, GPIO_ModeOut_PP_5mA );

SPI0_MasterDefInit();

3. Initially, the DC, RES, and BL corners of ST7735 are all configured to 20mA output mode:

GPIOA_ModeCfg(RES_PIN | DC_PIN | CS_PIN, GPIO_ModeOut_PP_20mA);

4. Define the high and low levels of DC, RES, and BL as follows:

#define RES_PIN  GPIO_Pin_0
#define DC_PIN   GPIO_Pin_1
#define BLK_PIN  GPIO_Pin_3
#define SCK_PIN  GPIO_Pin_13
#define MOSI_PIN GPIO_Pin_14
#define CS_PIN   GPIO_Pin_12
//-----------------LCD端口定义----------------

#define LCD_CS_Clr()   GPIOA_ResetBits(CS_PIN)//CS
#define LCD_CS_Set()   GPIOA_SetBits(CS_PIN)

#define LCD_RES_Clr()  GPIOA_ResetBits(RES_PIN)//RES
#define LCD_RES_Set()  GPIOA_SetBits(RES_PIN)

#define LCD_DC_Clr()   GPIOA_ResetBits(DC_PIN)//DC
#define LCD_DC_Set()   GPIOA_SetBits(DC_PIN)

#define LCD_BLK_Clr()  GPIOA_ResetBits(BLK_PIN)//BLK
#define LCD_BLK_Set()  GPIOA_SetBits(BLK_PIN)

After the above four steps, ST7735 hardware initialization is OK. Compared with STM32, its statement is concise. I transplanted ST7735 from N32G45 project in just a few steps and it took a few minutes to complete.

I put other ST7735 driver libraries in the attachment. Download the project, unzip it to the EXAM directory and you can test it directly.

main.c is:

/********************************** (C) COPYRIGHT *******************************
 * File Name          : Main.c
 * Author             : 刘建华
 * Version            : V1.0
 * Date               : 2022/02/27
 * Description        : 演示ST7735 硬件SPI驱动
 *******************************************************************************/

#include "CH58x_common.h"
#include "lcd_init.h"
#include "lcd.h"
__attribute__((aligned(4)))   UINT8 spiBuff[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6 };
__attribute__((aligned(4)))   UINT8 spiBuffrev[16];

void DebugInit( void )
{
  GPIOA_SetBits( GPIO_Pin_9 );
  GPIOA_ModeCfg( GPIO_Pin_8, GPIO_ModeIN_PU );
  GPIOA_ModeCfg( GPIO_Pin_9, GPIO_ModeOut_PP_5mA );
  UART1_DefInit();
}

int main()
{
  UINT8 i;

  SetSysClock( CLK_SOURCE_PLL_60MHz );

  /* 配置串口调试 */
  DebugInit();
  PRINT( "Start @ChipID=%02X\n", R8_CHIP_ID );

  LCD_Init();
  LCD_Fill(0,0,LCD_W,LCD_H,WHITE);
  LCD_ShowString(10,0,"CH582M",BLUE,WHITE,32,0);
  LCD_ShowString(16,36,"HELLO WORLD",RED,WHITE,16,0);
  LCD_ShowString(16,54,"ST7735",RED,WHITE,16,0);
  while( 1 )
    ;

}

tagetage

Okay, thumbs up.