ad9361: src: main.c: Set DAC rate for 1r1t mode

[danmois]

Set tx_dac rate to 1 for 1r1t mode fo AD9361.

Problem signaled and solved in the following two EZ threads: https://ez.analog.com/microcontroller-no-os-drivers/f/q-a/581897/no-os-1r1t-dac-dma https://ez.analog.com/microcontroller-no-os-drivers/f/q-a/571313/ad9364-dac-rate/498804?queryID=92a6dba6aaea82ca5f95812696f18cc2&objectId=0479fa6a-6177-4c34-8bc3-cd9264901e12&eztype=Forum%20Reply

PR Type

• [ ] Bug fix (change that fixes an issue)
• [ ] New feature (change that adds new functionality)
• [ ] Breaking change (has dependencies in other repos or will cause CI to fail)

PR Checklist

• [x] I have followed the Coding style guidelines
• [x] I have performed a self-review of the changes
• [x] I have commented my code, at least hard-to-understand parts
• [x] I have build all projects affected by the changes in this PR
• [x] I have tested in hardware affected projects, at the relevant boards
• [x] I have signed off all commits from this PR
• [x] I have updated the documentation (wiki pages, ReadMe etc), if applies

[danmois]

a proper explanation in the commit message would be nice :) (why is this change needed) I updated the commit message. also, now the rate is ovewritten with the same value for ad9364 device. It is true, the rate is overwritten with the same value I was thinking the code is more readable this way. Will modify the statement.

[danmois]

V2

• update commit comment
• prevent option overwritten with same value for AD9364 device

[danmois]

V3

• set ADC and DAC number of channels to 2