使用EXMC方式驱动LCD显示屏。
GD32F427VEXMC系统架构图
扩展板硬件
扩展板硬件EXMC接口部分电路图
2.1、开发板接口部分
2.2、LCD接口部分
驱动程序
3.1、exmc.c
#include 'gd32f4xx.h'
#include 'exmc_lcd.h'
/*!
brief lcd peripheral initialize
param[in] none
param[out] none
retval none
*/
void exmc_lcd_init(void)
{
exmc_norsram_parameter_struct lcd_init_struct;
exmc_norsram_timing_parameter_struct lcd_timing_init_struct;
/* EXMC clock enable */
rcu_periph_clock_enable(RCU_EXMC);
/* GPIO clock enable */
rcu_periph_clock_enable(RCU_GPIOD);
rcu_periph_clock_enable(RCU_GPIOE);
/* configure GPIO D[0-15] */
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);
gpio_af_set(GPIOE, GPIO_AF_12, 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_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_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);
/* configure PE2(EXMC_A23) */
gpio_af_set(GPIOE, GPIO_AF_12, GPIO_PIN_2);
gpio_mode_set(GPIOE, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_2);
gpio_output_options_set(GPIOE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_2);
/* configure NOE NWE */
gpio_af_set(GPIOD, GPIO_AF_12, GPIO_PIN_4 | GPIO_PIN_5);
gpio_mode_set(GPIOD, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_4 | GPIO_PIN_5);
gpio_output_options_set(GPIOD, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_4 | GPIO_PIN_5);
/* configure EXMC NE0 */
gpio_af_set(GPIOD, GPIO_AF_12, GPIO_PIN_7);
gpio_mode_set(GPIOD, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_7);
gpio_output_options_set(GPIOD, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_7);
lcd_timing_init_struct.asyn_access_mode = EXMC_ACCESS_MODE_A;
lcd_timing_init_struct.syn_data_latency = EXMC_DATALAT_2_CLK;
lcd_timing_init_struct.syn_clk_division = EXMC_SYN_CLOCK_RATIO_2_CLK;
lcd_timing_init_struct.bus_latency = 0;
lcd_timing_init_struct.asyn_data_setuptime = 7;
lcd_timing_init_struct.asyn_address_holdtime = 2;
lcd_timing_init_struct.asyn_address_setuptime = 5;
lcd_init_struct.norsram_region = EXMC_BANK0_NORSRAM_REGION0;
lcd_init_struct.write_mode = EXMC_ASYN_WRITE;
lcd_init_struct.extended_mode = DISABLE;
lcd_init_struct.asyn_wait = DISABLE;
lcd_init_struct.nwait_signal = DISABLE;
lcd_init_struct.memory_write = ENABLE;
lcd_init_struct.nwait_config = EXMC_NWAIT_CONFIG_BEFORE;
lcd_init_struct.wrap_burst_mode = DISABLE;
lcd_init_struct.nwait_polarity = EXMC_NWAIT_POLARITY_LOW;
lcd_init_struct.burst_mode = DISABLE;
lcd_init_struct.databus_width = EXMC_NOR_DATABUS_WIDTH_16B;
lcd_init_struct.memory_type = EXMC_MEMORY_TYPE_SRAM;
lcd_init_struct.address_data_mux = DISABLE;
lcd_init_struct.read_write_timing = &lcd_timing_init_struct;
lcd_init_struct.write_timing = &lcd_timing_init_struct;
exmc_norsram_init(&lcd_init_struct);
exmc_norsram_enable(EXMC_BANK0_NORSRAM_REGION0);
}
3.2、lcd.c
#include 'gd32f4xx.h'
#include 'ili9320.h'
#include 'ili9320_font.h'
#include 'systick.h'
#include < stdio.h >
/*!
brief write data to the selected LCD register
param[in] register_id: the selected register id
param[in] value: the register value to be written
param[out] none
retval none
*/
void lcd_register_write(uint16_t register_id,uint16_t value)
{
*(__IO uint16_t *) (BANK0_LCD_C)= register_id;
*(__IO uint16_t *) (BANK0_LCD_D)= value;
}
/*!
brief read the value of LCD register
param[in] register_id: the register id
param[out] none
retval the register value
*/
uint16_t lcd_register_read(uint8_t register_id)
{
uint16_t data;
*(__IO uint16_t *) (BANK0_LCD_C)= register_id;
data = *(__IO uint16_t *) (BANK0_LCD_D);
return data;
}
/*!
brief write command to LCD register
param[in] value: the register value to be written
param[out] none
retval none
*/
void lcd_command_write(uint16_t value)
{
/* write 16-bit index, then write reg */
*(__IO uint16_t *) (BANK0_LCD_D) = value;
}
/*!
brief prepare to write to the LCD GRAM register(R22h)
param[in] none
param[out] none
retval none
*/
void lcd_gram_write_prepare(void)
{
*(__IO uint16_t *) (BANK0_LCD_C) = 0x0022;
}
/*!
brief write RGB code to the LCD GRAM register
param[in] rgb_code: the pixel color in RGB mode (5-6-5)
param[out] none
retval none
*/
void lcd_gram_write(uint16_t rgb_code)
{
/* write 16-bit GRAM register */
*(__IO uint16_t *) (BANK0_LCD_D) = rgb_code;
}
/*!
brief read data from GRAM
param[in] none
param[out] none
retval GRAM value
*/
uint16_t lcd_gram_read(void)
{
uint16_t data;
/* write GRAM register (R22h) */
*(__IO uint16_t *) (BANK0_LCD_C) = 0x0022;
/* dummy read (invalid data) */
*(__IO uint16_t *) (BANK0_LCD_D);
data = *(__IO uint16_t *) (BANK0_LCD_D);
return data;
}
/*!
brief initialize the LCD
param[in] none
param[out] none
retval none
*/
void lcd_init(void)
{
uint16_t i;
uint16_t device_code;
rcu_periph_clock_enable(RCU_GPIOD);
gpio_mode_set(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_3|GPIO_PIN_6);
gpio_bit_set(GPIOD, GPIO_PIN_3);
gpio_bit_set(GPIOD, GPIO_PIN_6);
gpio_bit_reset(GPIOD, GPIO_PIN_6);
delay_1ms(200);
gpio_bit_set(GPIOD, GPIO_PIN_6);
delay_1ms(200);
if(1){ /*!< if(device_code == 0x8989) */
lcd_register_write(0x0000,0x0001);
lcd_register_write(0x0003,0xA8A4);
lcd_register_write(0x000C,0x0000);
lcd_register_write(0x000D,0x080C);
lcd_register_write(0x000E,0x2B00);
lcd_register_write(0x001E,0x00B0);
lcd_register_write(0x0001,0x2B3F);
lcd_register_write(0x0002,0x0600);
lcd_register_write(0x0010,0x0000);
lcd_register_write(0x0011,0x6070);
lcd_register_write(0x0005,0x0000);
lcd_register_write(0x0006,0x0000);
lcd_register_write(0x0016,0xEF1C);
lcd_register_write(0x0017,0x0003);
lcd_register_write(0x0007,0x0233);
lcd_register_write(0x000B,0x0000);
lcd_register_write(0x000F,0x0000);
lcd_register_write(0x0041,0x0000);
lcd_register_write(0x0042,0x0000);
lcd_register_write(0x0048,0x0000);
lcd_register_write(0x0049,0x013F);
lcd_register_write(0x004A,0x0000);
lcd_register_write(0x004B,0x0000);
lcd_register_write(0x0044,0xEF00);
lcd_register_write(0x0045,0x0000);
lcd_register_write(0x0046,0x013F);
lcd_register_write(0x0030,0x0707);
lcd_register_write(0x0031,0x0204);
lcd_register_write(0x0032,0x0204);
lcd_register_write(0x0033,0x0502);
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