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deep · 2023-10-25

I have an jetson xavier driving STM32F407G-DISC1 on SPI1 default pins : PA4/5/6/7 .The SPI_FLAG_RXNE flag behaviour is very strange, resulting in wrong values being received.Config used:/* SPI1 parameter configuration*/hspi1.Instance = SPI1;h...

deep · 2019-05-07

when:VDD=SD=IN=PWM=12VVoltage between OUT1 and OUT2 is +40mVDirection of OUT1-OUT2 voltage flips depending on DIRThis happens when driver supply voltage (VS) is disconnected or VS = 12V , 24V, 48V .I'm guessing that the output driver of PWD5F60 is si...

deep · 2023-11-05

When I return a known pattern from slave back to master, I still get garbage:uint8_t txd [] = {0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0x FF}; Noise on SCK signal means data is corrupted in both directions,...

deep · 2023-10-31

Yes bit flips are in MOSI (Orin->stm32) direction. I run an echo server on stm side with something like: uint8_t tx = 0xAA; uint8_t rx = 0xBB; while (true) { HAL_SPI_TransmitReceive(&hspi1, &tx, &rx, 1, HAL_MAX_DELAY); //printf("slave: tx=%...

deep · 2023-10-27

SPI master is Jetson Orin -- which has plenty of power decoupling but no slew rate controls on GPIO. The bit flips are always 1->0 Replaced ribbon cable with shielded ground return pairs with no improvement. Couldn't use the 80-wire "high speed" 40-...

deep · 2023-10-26

with and without termination signals look like this on slow clocks: around 200KHz there are single bit flip errors in about 10% of the data: if hardware slave select is enabled in receiver then the bit flip errors are the last bit. otherwise they're...

deep · 2023-10-26

Terminating the SCK on slave stm side seems to help a LOT:after adding a terminating resistor on sink of SCK:much better--thanks TDK and waclawek.jan .However the performance is still pretty poor--starts having errors around 200kHz . The Slave SPI r...

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slave spi on stm32f4 receives incorrect data

EVALPWD5F60 data brief pdf says that the max supply voltage range of VS is 400V : is there a min VS value as well?

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Re: slave spi on stm32f4 receives incorrect data

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Re: slave spi on stm32f4 receives incorrect data

Re: slave spi on stm32f4 receives incorrect data