Posted on March 07, 2013 at 17:02 I will need to use spi with a memory chip. But I currently can't get my spi to input data.
I am able to get it to output. I have a logic analyzer hooked up and it shows data is being outputed. When I do a loop back test it shows the data being delivered to the input pin PB14 but the micro does not seem to realize this.
I am thinking that I do not have the pin set up for input, but I have tried different configurations but nothing seems to work
This code sets up the spi, sends out data and is suppose to read it in
code:
void SPIInit (void)
{
* regRCC_APB2ENR = 0x9; //turn on gpiob and afio
* regRCC_APB1ENR = 0x4000; // turn on spi 2
* regGPIOB_CRH = 0xB4B34B44; //this is where i might be having issues
* regSPI_CR1 = 0x334;
//* regSPI_CR2 = 0x04;
* regSPI_CR2 = 0x00;
* regSPI_CR1 |= 0x0040;
}
void SendOne()
{
char data;
*regGPIOB_BSRR = 0x00001000;//CS high (set) PB12
while ((* regSPI_SR & 0x02 )!= 0x02){;} // when transmit buffer is empty send data
*regSPI_DR = 0x9; // send enable to memory chip EWEN
//*regSPI_DR = 'a'; // send enable to memory chip EWEN
//edited it below as it was 0x2 and it was suppose to be 0x1
while ((* regSPI_SR & 0x000001 )!= 0x01){;} // when receive buffer not empty read data, program getting stuck here
data = * regSPI_DR; //reading clears flags
//*regGPIOB_BSRR = 0x00001000; //reset chip select low
}
spi
