我是嵌入式的新手,甚至是相机传感器的新手——请多多包涵。我正在尝试连接 OV2640 相机模块(OV2640 数据表,带分线板的模块)。所以我连接了以下内容:
- OV2640 - LPC1768
- 地线------- p1(地线)
- VCC ------- p40 (Vout - 3.3V)
- SDA -------- p28 (I2C SDA)
- SCL -------- p27 (I2C SCL)
我试图让它通过SCCB工作,这就是连接 I2C 的原因。但似乎我无法正确设置。
这是我现在拥有的代码:
#include <stdio.h>
#include "mbed.h"
Serial pc(USBTX, USBRX); // tx, rx to the PC
I2C cam(p28, p27); // I2C
int main() {
pc.printf("Starting new program\r\n");
cam.start();
int addressCOM7 = 0x12;
int addressCLKRC = 0x11;
int addressCOM2 = 0x09;
const char data = 1;
int length = 8;
bool repeated = false;
int rtn = -1;
cam.frequency(400000);
pc.printf("Camera I2c set to 400,000Hz \r\n");
rtn = cam.write(addressCOM7, "1", addressCOM7 + data);
if ( rtn == 0)pc.printf("COM7 set to 1. \r\n");
else pc.printf("Error Setting COM7 to 1. \r\n");
rtn = cam.write(addressCLKRC, &data, addressCLKRC + data);
if (rtn == 0) pc.printf("CLKRC set to 1. \r\n");
else pc.printf("Error Setting CLKRC to 1. \r\n");
rtn = cam.write(addressCOM2, &data, addressCOM2 + data);
if (rtn == 0) pc.printf("COM2 set to 1. \r\n");
else pc.printf("Error Setting COM2 to 1. \r\n");
int address = 0x30;
char readData[128];
strcpy (readData,"");
while(1) {
cam.read(address, readData, 128);
wait(2.0);
pc.printf("1 = '%s'\r\n", readData);
}
}
我无法通过 I2C 写入或读取 - 我在这里做错了什么?
另外,相信 XCLK 需要绑定到 OV2640 模块,如何从 LPC1768 微控制器完成?