for LPC1769, is there a time delay needed when configuring SSP/SPI channels to transition between 16 and 8 bit transfer modes?

pgenerale — Wed, 07 Nov 2018 16:05:56 GMT

We have 2 devices on the SSP0 but, one needs the usual 8 bit (byte) data transfers, but the other needs a 12 bit transfer (for which we configure SSP0 to send 16 bits). Since we talk to one device followed by talking to the other, we are constantly re-configuring. The device that used the 16 bits seems to be dropping data sometimes. When I inserted a delay before reconfigure to 16 bits, the data seems to have cleaned up. But the delay was 3 instructions. I wanted to find out if this is an issue and the proper way to address it is a delay.

Thanks for any advice.

Re: for LPC1769, is there a time delay needed when configuring SSP/SPI channels to transition between 16 and 8 bit transfer modes?

victorjimenez — Fri, 09 Nov 2018 23:06:25 GMT

Hello Piero Generale,

Could you please share your code on how are making the re-configuration of the peripheral? Also, may I ask why are you sending 16 bits if the device needs 12 bit transfer? As you can see in the following table, you can select a data size of 12-bit.

Best Regard,

Victor.

LPC Microcontrollersのトピックfor LPC1769, is there a time delay needed when configuring SSP/SPI channels to transition between 16 and 8 bit transfer modes?

for LPC1769, is there a time delay needed when configuring SSP/SPI channels to transition between 16 and 8 bit transfer modes?

Re: for LPC1769, is there a time delay needed when configuring SSP/SPI channels to transition between 16 and 8 bit transfer modes?