Posted on January 18, 2014 at 15:05STM32F407 I2C too simple by ZIOS V1.03
Example: I2C register access for TCM8240MD camera.
#include ''Zystem.h''
short T;
void MiliSecond()
{
if(T) T--;
}
int main()
{
char RxData;
// TCM8240MD I2C example
pinmod('D',1,output); // GPIOD02 is a output for the TCM8240MD Reset pin
pinclr('D',1); // TCM8240MD Reset line is low
T=100; while(T); // wait 100ms
pinset('D',1); // TCM8240MD Reset line is high
T=10; while(T); // wait 10ms
I2Cinit(400000); // I2C clock frequency is 400 Khz
// Lets read 0x04 location of TCM8240MD
I2Cstart(); // Start Condition
I2Ccmd(0x3D,0); // TCM8240MD Adr=0x3D, (R/W bit=0, write means)
I2Cwrite(0x04); // TCM8240MD register address is 0x04
I2Cstart(); // Start Condition
I2Ccmd(0x3D,1); // TCM8240MD Adr=0x3D, (R/W bit=0, read means)
RxData=I2CreadNack(); // Read [0x04] register (No ACK)
I2Cstop(); // Stop condition
// Lets write 0x0B in to 0x04 location of TCM8240MD
I2Cstart(); // Start Condition
I2Ccmd(0x3D,0); // TCM8240MD Adr=0x3D, (R/W bit=0, write means)
I2Cwrite(0x04); // Register address is 0x04
I2Cwrite(0x0B); // Register data is 0x0B
I2Cstop(); // Stop condition
// Lets read 0x04 location of TCM8240MD
I2Cstart(); // Start Condition
I2Ccmd(0x3D,0); // TCM8240MD Adr=0x3D, (R/W bit=0, write means)
I2Cwrite(0x04); // Register address is 0x04
I2Cstart(); // Start Condition
I2Ccmd(0x3D,1); // TCM8240MD Adr=0x3D, (R/W bit=0, read means)
RxData=I2CreadNack(); // Read [0x04] register (No ACK)
I2Cstop(); // Stop condition
while(1);
}
