LPC MicrocontrollersのトピックRe: LPC1768 XPresso board SSP0 slave mode

LPC1768 XPresso board SSP0 slave mode

kk7xo — Thu, 18 Dec 2025 01:51:41 GMT

I have a LPC1768 XPresso board with the SSP0 port configured as a slave. The master is an Analog Devices AD73322 codec.

After configuring the SSP port to TI mode, and after enabling the port, I load two values into the data register. I can see on my logic analyzer that the master is sending SCLK and FS as shown in UM10360 (LPC176X user manual) Fig. 77 page 425, however the LPC1768 is not transmitting the contents of the data register on the MISO0 pin.

I've tried lots of configuration changes but so far no luck in getting it to work. However, I do have this codec working as a master on an SSP bus with the LPC2138 as the slave.

Any ideas?

Re: LPC1768 XPresso board SSP0 slave mode

Harry_Zhang — Fri, 19 Dec 2025 08:48:35 GMT

Hi @kk7xo

Can you share your code?

Harry

Re: LPC1768 XPresso board SSP0 slave mode

kk7xo — Sat, 20 Dec 2025 22:09:51 GMT

As is so often the case, when I created a minimal program to demonstrate the problem I was having, I managed to fix it. I was writing configuration data to the wrong registers. So everything is working now. Thanks for responding.