Timeline for L9780 and SPI communication
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Aug 19 at 18:01 | history | bumped | Community Bot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 21 at 16:04 | history | bumped | Community Bot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Dec 22, 2024 at 15:01 | history | bumped | Community Bot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 24, 2024 at 15:00 | history | bumped | Community Bot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jul 24, 2024 at 12:49 | answer | added | jungle_jim | timeline score: 0 | |
| Jul 20, 2024 at 14:33 | comment | added | jungle_jim | @hcheung Also, thanks for the heads-up on the endianness. That'll be easy to implement and at least provide another known. I had looked into how pointers/addresses worked with big/little endian on the worry I was mixing something up. I wasn't 100% clear on how the endianess worked with a #define that was expanded at compile time and the SPI.transfer order. That's reason why I used a secondary local variable in the function call with the hope was implementing a local var would alleviate issues. I'll try both and see what happens! | |
| Jul 20, 2024 at 14:28 | comment | added | jungle_jim | @hcheung thanks, some good feedback. I've run some SPI devices capable up around 10MHz before but I never really dug into their library far to see if they were adjusting the prescalar or not; that's a poor assumption on my part, it's never a bad thing to slow it down first so that'll be a good start to check things. | |
| Jul 20, 2024 at 13:46 | comment | added | hcheung | 1) The datasheet say maximum 8MHz, it doesn't mean you have to run at 8MHz, in fact since you are using an Uno which has a clock speed of 16MHz, you probably shouldn't run the SPI higher than 4MHz. 2) I don't think your code send the correct command due to Endianness. So instead of defining the L9780_status_reg as 0xF7FFFFFFFFFFFFFF, defined it with an array L9780_status_reg[] = { 0xF7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, this will ensure the MS bit of the MS Byte get send out first with SPI.transfer(L9780_status_reg, sizeof(L9780_status_reg)); | |
| Jul 20, 2024 at 1:17 | history | edited | jungle_jim | CC BY-SA 4.0 |
added 359 characters in body
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| S Jul 20, 2024 at 1:13 | review | First questions | |||
| Jul 20, 2024 at 1:15 | |||||
| S Jul 20, 2024 at 1:13 | history | asked | jungle_jim | CC BY-SA 4.0 |