1 \uff09 \u5728\u539f\u5148SRC\u76ee\u5f55\u4e0b\u6dfb\u52a0 gt911.c \u548cgt911.h\u5185\u5bb9\u5206\u522b\u5982\u4e0b\uff1a<\/strong><\/p>\n\n\n\ngt911.c: (\u5305\u542b\u89e6\u6478\u5c4f\u521d\u59cb\u5316\uff0c\u4ee5\u53ca\u89e6\u6478\u5c4f\u5bc4\u5b58\u5668\u7684\u8bfb\u5199\u7b49\u64cd\u4f5c)<\/p>\n\n\n\n
\/\/www.hellofpga.com
#include \"xgpiops.h\"
#include \"xiicps.h\"
#include \"sleep.h\"
#define RESET_PIN 55
#define INT_PIN 54
#define Slave_Address (0xBA>>1)
static XIicPs i2c;
extern XGpioPs Gpio;
int gt911_read_reg(uint16_t addr, uint8_t *buf, int len) {
uint8_t send_buf[2];
int status;
\/\/ Set the high and low bytes of the register address
send_buf[0] = (uint8_t)(addr >> 8);
send_buf[1] = (uint8_t)(addr & 0xFF);
\/\/ Send the read command
status = XIicPs_MasterSendPolled(&i2c, send_buf, 2, Slave_Address);
if (status != XST_SUCCESS) {
return status;
}
\/\/ Wait for the I2C bus to be idle
while (XIicPs_BusIsBusy(&i2c));
\/\/ Receive data from the I2C bus
status = XIicPs_MasterRecvPolled(&i2c, buf, len, Slave_Address);
if (status != XST_SUCCESS) {
return status;
}
\/\/ Wait for the I2C bus to be idle again
while (XIicPs_BusIsBusy(&i2c));
return XST_SUCCESS;
}
int gt911_write_reg(uint16_t addr, uint8_t *buf, int len) {
uint8_t send_buf[256] = {0};
int status;
\/\/ Set the high and low bytes of the register address
send_buf[0] = (uint8_t)(addr >> 8);
send_buf[1] = (uint8_t)(addr & 0xFF);
\/\/ Copy the data from the buffer into send_buf starting at index 2
memcpy(&send_buf[2], buf, len);
\/\/ Send the write command
status = XIicPs_MasterSendPolled(&i2c, send_buf, len + 2, Slave_Address);
if (status != XST_SUCCESS) {
return status;
}
\/\/ Wait for the I2C bus to be idle
while (XIicPs_BusIsBusy(&i2c));
return XST_SUCCESS;
}
int gt911_init(void)
{
XIicPs_Config *i2cConfig;
uint8_t buffer[5] = {0};
i2cConfig = XIicPs_LookupConfig(XPAR_XIICPS_0_DEVICE_ID);
XIicPs_CfgInitialize(&i2c, i2cConfig, i2cConfig->BaseAddress);
XIicPs_SetSClk(&i2c, 200000);
XGpioPs_SetDirectionPin(&Gpio, RESET_PIN, 1);
XGpioPs_SetDirectionPin(&Gpio, INT_PIN, 1);
XGpioPs_SetOutputEnablePin(&Gpio, RESET_PIN, 1);
XGpioPs_SetOutputEnablePin(&Gpio, INT_PIN, 1);
\/\/SET 0XBA\/0XBB
XGpioPs_WritePin(&Gpio, RESET_PIN, 0);
XGpioPs_WritePin(&Gpio, INT_PIN, 0);
usleep(200); \/\/200us
XGpioPs_WritePin(&Gpio, RESET_PIN, 1);
usleep(55000); \/\/55ms
XGpioPs_SetDirectionPin(&Gpio, INT_PIN, 0);\/\/input_floating
\/\/READ ID
gt911_read_reg(0x8140, buffer, 4);
buffer[3]='\\0';
\t\/\/xil_printf(\"CTP ID:%s\\r\\n\", buffer);
\tif(strcmp((char*)buffer,\"911\")==0){
\t\treturn 0;
\t}
\t\treturn 1;
}
int gt911_read(int16_t *x, int16_t *y)
{
uint8_t buf[7] = {0};
\/\/ Read coordinate data
gt911_read_reg(0x814E, buf, 6);
\/\/ Clear the touch state
buf[6] = 0x0;
gt911_write_reg(0x814E, &buf[6], 1);
\/\/ Check if a touch event is detected
\/\/ The high bit of buf[0] (0x80) indicates touch validity,
\/\/ and the lower four bits (0x0F) indicate the number of touch points
if ((buf[0] & 0x80) && (buf[0] & 0x0F)) {
\/\/ Extract coordinates (16-bit)
*x = (buf[3] << 8) | buf[2]; \/\/ X coordinate
*y = (buf[5] << 8) | buf[4]; \/\/ Y coordinate
return 1; \/\/ Successfully read coordinates
}
return 0; \/\/ No touch detected
}<\/pre>\n\n\n\ngt911.h<\/p>\n\n\n\n
\/\/www.hellofpga.com
#ifndef __GT911_H
#define __GT911_H
int gt911_read(int16_t *x, int16_t *y);
int gt911_init();
#endif<\/pre>\n\n\n\n2 \uff09\u4fee\u6539main.c\u7684\u5185\u5bb9<\/strong><\/p>\n\n\n\n\/\/www.hellofpga.com
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include \"xil_types.h\"
#include \"xil_cache.h\"
#include \"xparameters.h\"
#include \"xaxivdma.h\"
#include \"xaxivdma_i.h\"
#include \"sleep.h\"
#include \"xgpiops.h\"
#include \"gt911.h\"
#define WIDTH 800
#define HEIGHT 480
#define VDMA_BASEADDR\tXPAR_AXI_VDMA_0_BASEADDR
#define VIDEO_BASEADDR0 0x01000000
uint8_t *frame_buffer0 = (uint8_t *)VIDEO_BASEADDR0;
#define GPIO_DEVICE_ID \tXPAR_XGPIOPS_0_DEVICE_ID
XGpioPs Gpio;
#define KEY 56
void Gpio_Init(){
\tXGpioPs_Config *ConfigPtr;
\tConfigPtr = XGpioPs_LookupConfig(GPIO_DEVICE_ID);
\tXGpioPs_CfgInitialize(&Gpio, ConfigPtr,ConfigPtr->BaseAddr);
\tXGpioPs_SetDirectionPin(&Gpio, KEY, 0);
}
void VDMA_init(){
Xil_Out32((VDMA_BASEADDR + 0x000), 0x00000001);
Xil_Out32((VDMA_BASEADDR + 0x05c), VIDEO_BASEADDR0);
Xil_Out32((VDMA_BASEADDR + 0x058), (WIDTH*3));
Xil_Out32((VDMA_BASEADDR + 0x054), (WIDTH*3));
Xil_Out32((VDMA_BASEADDR + 0x050), HEIGHT);
Xil_Out32((VDMA_BASEADDR + 0x028), 0X00000000);
}
void clear_screen(void) {
unsigned int i, j;
for (i = 0; i < WIDTH; i++) {
for (j = 0; j < HEIGHT; j++) {
frame_buffer0[(j * WIDTH + i) * 3 + 2] = 0x00;
frame_buffer0[(j * WIDTH + i) * 3 + 1] = 0x00;
frame_buffer0[(j * WIDTH + i) * 3 + 0] = 0x00;
}
}
Xil_DCacheFlush();
}
void write_pixel_to_frame_buffer(int16_t pos_x, int16_t pos_y) {
if (pos_x >= 0 && pos_x < WIDTH && pos_y >= 0 && pos_y < HEIGHT) {
frame_buffer0[(pos_y * WIDTH + pos_x) * 3 + 2] = 0xFF;
frame_buffer0[(pos_y * WIDTH + pos_x) * 3 + 1] = 0xFF;
frame_buffer0[(pos_y * WIDTH + pos_x) * 3 + 0] = 0xFF;
Xil_DCacheFlush();
}
}
int main(void) {
int16_t pos_x, pos_y;
Gpio_Init();
VDMA_init();
gt911_init();
clear_screen();
while (1) {
if (XGpioPs_ReadPin(&Gpio, KEY) == 1)
clear_screen();
else if (gt911_read(&pos_x, &pos_y)) {
write_pixel_to_frame_buffer(pos_x, pos_y);
}
usleep(1000); \/\/ 1ms
}
}<\/pre>\n\n\n\n3 \uff09 \u7a0b\u5e8f\u89e3\u8bfb<\/strong>\uff1a<\/p>\n\n\n\na ) \u9996\u5148\u662fVDMA_init\uff08\uff09\uff0c\u8fd9\u4e2a\u5728\u524d\u4e24\u7ae0\u5185\u5bb9\u4e2d\u6709\u63d0\u5230\uff0c\u8fd9\u91cc\u4e3b\u8981\u662f\u8bbe\u7f6e\u4e86\u7f13\u5b58\u533a\u7684\u5730\u5740\u4e3a VIDEO_BASEADDR0\uff0c\uff08\u5907\u6ce8\u867d\u7136\u6211\u4eec\u7684vdma\u8bbe\u7f6e\u4e86\u4e09\u5e27\u7f13\u5b58\uff0c\u4f46\u662f\u672c\u6b21\u5de5\u7a0b\u6211\u4eec\u5b9e\u9645\u53ea\u7528\u4e86\u4e00\u5e27\u8fdb\u884c\u6f14\u793a\uff09\uff0c\u8fd9\u91cc\u6211\u4eec\u901a\u8fc7\u914d\u7f6e028h\u76844-0bit\u6765\u8ba9vdma\u505c\u7559\u5728\u6211\u4eec\u6307\u5b9a\u7684\u7f13\u5b58\u5e270\u4e0a(\u524d\u6587\u4e2d\u5df2\u5c06vdma \u914d\u7f6e\u5728\u975e\u5faa\u73af\u72b6\u6001\u4e0b\uff0cPark Mode)<\/p>\n\n\n\n
b ) write_pixel_to_frame_buffer<\/code><\/strong>\uff1a\u6839\u636e\u4f20\u5165\u7684\u5750\u6807\uff08pos_x<\/code>, pos_y<\/code>\uff09\u5c06\u8be5\u4f4d\u7f6e\u7684\u50cf\u7d20\u989c\u8272\u8bbe\u7f6e\u4e3a\u767d\u8272\u3002<\/p>\n\n\n\nc)<\/code> clear_screen<\/code><\/strong>\uff1a\u6e05\u7a7a\u5c4f\u5e55\uff08\u5c06\u6bcf\u4e2a\u50cf\u7d20\u7684\u989c\u8272\u8bbe\u7f6e\u4e3a\u9ed1\u8272\uff09\u3002\u6bcf\u4e2a\u50cf\u7d20\u4f7f\u7528 3 \u5b57\u8282\u8868\u793a RGB \u989c\u8272\uff0c\u6bcf\u6b21\u5faa\u73af\u5c06\u6bcf\u4e2a\u50cf\u7d20\u7684 RGB \u503c\u90fd\u8bbe\u7f6e\u4e3a 0x00<\/code>\u3002<\/p>\n\n\n\nd) main\u51fd\u6570\uff1a \u5148\u521d\u59cb\u5316GPIO\u3001VDMA\u3001GT911\u89e6\u6478\u5c4f\u63a7\u5236\u5668\uff0c\u5e76\u901a\u8fc7 clear_screen()<\/code> \u6e05\u7a7a\u5c4f\u5e55\u3002<\/p>\n\n\n\ne ) \u5728\u4e3b\u5faa\u73af\u4e2d\uff0c\u68c0\u67e5\u6309\u952eBTN0\u72b6\u6001\uff0c\u5982\u679c\u6309\u952e\u6309\u4e0b\u5219\u6e05\u7a7a\u5c4f\u5e55\uff1b\u5982\u679c\u89e6\u6478\u5c4f\u6709\u89e6\u6478\u4e8b\u4ef6\uff0c\u5219\u83b7\u53d6\u89e6\u6478\u5750\u6807\u5e76\u66f4\u65b0\u663e\u793a\u5c4f\u4e0a\u7684\u50cf\u7d20\u3002\u8fd9\u91cc\u7684\u5ef6\u65f6\u5fc5\u987b\u52a0\uff0c\u5426\u5219\u4f1a\u56e0\u4e3a\u4e0d\u505c\u7684\u626b\u63cf\u53cd\u800c\u9020\u6210\u626b\u63cf\u5361\u4f4f\u7684\u60c5\u51b5(\u6ce8\u610fLemon ZYNQ \u6309\u4e0b\u6309\u952e\u540e\u4e3a\u9ad8\u7535\u5e73)<\/strong><\/p>\n\n\n\n while (1) {
if (XGpioPs_ReadPin(&Gpio, KEY) == 1)
clear_screen();
else if (gt911_read(&pos_x, &pos_y)) {
write_pixel_to_frame_buffer(pos_x, pos_y);
}
usleep(1000); \/\/ 1ms
}<\/pre>\n\n\n\n
![\"\"](\"http:\/\/www.hellofpga.com\/wp-content\/uploads\/2024\/12\/image-36-1024x698.png\")
<\/figure>\n\n\n\n![\"\"](\"http:\/\/www.hellofpga.com\/wp-content\/uploads\/2024\/12\/image-38.png\")
<\/figure>\n\n\n\n![\"\"](\"http:\/\/www.hellofpga.com\/wp-content\/uploads\/2024\/12\/image-37.png\")
<\/figure>\n\n\n\n![\"\"](\"http:\/\/www.hellofpga.com\/wp-content\/uploads\/2024\/12\/image-39.png\")
<\/figure>\n\n\n\n![\"\"](\"http:\/\/www.hellofpga.com\/wp-content\/uploads\/2024\/12\/image-40.png\")
<\/figure>\n\n\n\n