Dear all I'm using CY15B104Q memory controlled using a pearl gecko and I have noticed that in order to properly write the info on the memory some times I have to retry the procedure many times.
The SPI driver is configured in mode 0 and the clock frequency of the processor is set @38 MHz and the clock speed of the SPI is set @5MHz.
This is the code of the function that I use to write the data on to the F-RAM:
int SHM_FRAM_WriteData(SPIDRV_Handle_t handle, uint32_t addr,uint16_t data)
{
uint8_t bufferTx[10] = {};
bufferTx[0] = FRAM_WREN;
SHM_Config_FRAM_SPI_CS_Enable(false);
SPIDRV_MTransmitB(handle,bufferTx,1);
SHM_Config_FRAM_SPI_CS_Enable(true);
bufferTx[0]= FRAM_WRITE;
bufferTx[1]=(addr&0x00070000)>>16;
bufferTx[2]=(addr&0x0000FF00)>>8;
bufferTx[3]=(addr&0x000000FF);
bufferTx[4]=(data&0xFF00)>>8;
bufferTx[5]=(data&0x00FF);
SHM_Config_FRAM_SPI_CS_Enable(false);
SPIDRV_MTransmitB(handle, bufferTx,6);
SHM_Config_FRAM_SPI_CS_Enable(true);
return 0;
}
Using this function if i try to read back immediately the data written what I read is different so in order to avoid this I have implemented a function that force the write operation until when I read back the data I got what I have wrote previously.
This is the code of the function:
int SHM_FRAM_WWriteData(SPIDRV_Handle_t handle, uint32_t addr,uint16_t data)
{
uint16_t rData;
SHM_FRAM_WriteData(handle,addr,data);
SHM_FRAM_ReadData(handle,addr,&rData);
while(data!=rData)
{
SHM_FRAM_WriteData(handle,addr,data);
SHM_FRAM_ReadData(handle,addr,&rData);
}
return 0;
}
With the SPI @5MHz I have measured that the 70% of the write attempt fail at first instance and the situation get worst if I try to increase the speed of the SPI.
Any suggestion on the possible cause of this behavior?
