Hi Sudeep,
please share a scope from the SPI communication. Please reset your device. After this you should read on the SO line 1010101010101010 message, when you try to write or read.
Please refer to the note 2. in the page 7. To which pins have you connected the LED? Have you shorted the pins with the same name together?
Please refer to the Figure 13. in the MC34SB0410 datasheet. The SCLK line must be low on idle => CPOL=0, data must be sampled on the rising CLK edge and data must be changed on falling CLK edge => CPHA=0. This results in SPI mode 0.
Is your SPI timing according to the SPI mode 0?
With Best Regards,
Jozef
Hi Sudeep,
I don't see anything wrong with your code. Are you reading the SO SPI line with your MCU?
When you send the first write line, what do you see on the SO line? Is it all 0's? Or do you see this message: 1010101010101010?
If all 0's, it means, the SPI communication is not working.
Please consider purchasing TWR-SB0410-36EVB.
On the EVB page is a driver, you can download it and test it with your MCU.
With Best Regards,
Jozef
Dear Jozef,
Thank you for your reply, I dont have proper schematic but I am attaching a block diagram that shows what connections I have done.
For the waveform I don't have any debugging tool to observe waveform, To see the wave form I used digital oscilloscope to observe the waveform on the pins. I could see that Clock waveform was fine(16 clock cycles) attaching a photo of that too
, and Chip select is also showing the output as expected. I can also see the wave form on MOSI line which means the data is going to MC34SB0410 Chip.I am attaching the photos of all these waveforms seperately as I only have one probe on me.
CHIP SELECT:
MASTER OUT SLAVE IN(MOSI) :
This is all I can provide you riight now. I am not getting anything on MISO line, I can confirm from above waveforms that SPI Commands are going in the chip but nothing is happening.
Please look into this matter and provide me a solution.
THANK YOU
Sudeep
Dear Sudeep,
if you see nothing on the SO line, then the SPI communication is not working. The oscilloscope scopes are great. It's great, that at least the clock, CS and SI is working. But I would need to see at last two channels at the same time. CLK+MISO, CLK+MOSI and CLK+CS. To compare timings and to confirm, that the SPI mode is indeed 0. Is your oscilloscope two channel one? Or multichannel? Please contact the PIC18F25K80 manufacturer to confirm, that the SPI mode is set to 0.
Please add a pull-up resistor on the RSTB pin. 4.7kOhm should be ok.
With Best Regards,
Jozef
Dear Jozef,
I am sorry for not replying you as I was sick and wasn't working on it so I didn't make any progress.
As for the waveform currently I don't have an oscilloscope with me. The above screenshot does confirm that the data is getting transmitted from MCU to MC34SB0410 chip. Can you please check the code again to see if there is anything missing from it.
I haven't connected a resistor across the RSTB pin so I will connect a resistor to it as you have mentioned and try if it works or not. I think there shouldn't be any problem even if I have connected RSTB directly to 5v.
As for the SPI mode I am using MPLABX Code configurator to configure the settings of the SPI Protocol an so here I can directly select SPI MODE 0 in here so I can confirm that SPI is working in MODE 0.
Please check the code again and tell if I am doing anything wrong or not. I am attaching the code here:
#include "mcc_generated_files/mcc.h"
/*
Main application
*/
void Write_CMD(uint8_t cmd1,uint8_t cmd2);
uint8_t Read_Data();
void main(void)
{
// Initialize the device
SYSTEM_Initialize();
// unsigned char data[20];
SPI_Open(SPI_DEFAULT);
SLAVE_SetLow();
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0x00,0x00);
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0x04,0x02);
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0x0C,0x00);
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0x10,0x23);
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0x14,0x03);
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0x98,0x07);
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0xA4,0x38);
Read_Data();
SLAVE_SetHigh();
SLAVE_SetLow();
Write_CMD(0x2B,0xFF);
Read_Data();
SLAVE_SetHigh();
SPI_Close();
EUSART1_Write('E');
EUSART1_Write('\n');
// while(1);
}
void Write_CMD(uint8_t cmd1,uint8_t cmd2)
{
SPI_ExchangeByte(cmd1);
SPI_ExchangeByte(cmd2);
}
uint8_t Read_Data(){
uint8_t DATA1;
uint8_t DATA2;
DATA1=SPI_ExchangeByte(0x00);
DATA2=SPI_ExchangeByte(0x00);
EUSART1_Write(DATA1);
EUSART1_Write(DATA2);
}
/**
End of File
*/
With Best Regards
Sudeep
