Part Number: LAUNCHXL-CC1310
I connect cc1310 launchpad to 128x128, General 1.5inch OLED display Module through SPI, and on MOSI line i see following:
What's wrong with this SPI ?
Where are you probing MOSI line, closer to the output or input? I recommend you probe around the input and ground your probe to a ground near the input pin.
Have you tried adding a 20~50 ohm resistor in series? This helps to slow down the rising/falling edges.
What frequency are you using? Have you tried slowing down the bit rate?
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In reply to Seong Kim:
>>Where are you probing MOSI line, closer to the output or input?
Closed the output. Without connecting to display, MOSI have a fine level . And CLK have a fine signal level with this ground . Ground was both to CLK and MOSI.
>>Have you tried adding a 20~50 ohm resistor in series? This helps to slow down the rising/falling edges.
No , I will try to add.
>>What frequency are you using? Have you tried slowing down the bit rate?
frequency 1MHz . I tried to reduce the frequency, but it did not help.
The resistor did not help
In reply to Alex Shestakov:
i did the following :
1. сс1310 spi :
oledSpiParams.transferMode = SPI_MODE_BLOCKING;
oledSpiParams.transferTimeout = SPI_WAIT_FOREVER;
oledSpiParams.transferCallbackFxn = NULL;
oledSpiParams.mode = SPI_MASTER;
oledSpiParams.bitRate = 1000000;
oledSpiParams.dataSize = 8;
oledSpiParams.frameFormat = SPI_POL0_PHA0;
2. For channel MOSI i set in series 74HC126D .
And the display has earned.
Glad you got it working! What was different about your SPI parameter settings before?
oledSpiParams.frameFormat = SPI_POL1_PHA0;
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