why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

FormerMember — Thu, 02 Mar 2017 14:44:46 GMT

thank you friend,now the time is 22:42,it's time to go to sleep in china.thanks for your answer.wish you have a good day.i'll think your answer Tomorrow

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

Sigurd — Thu, 02 Mar 2017 14:41:15 GMT

This is the value the softdevice_enable() will tell you to use, 0x20002078 - start(0x20000000) = 0x2078 = 8312 byte = 8.1171875 kB.

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

FormerMember — Thu, 02 Mar 2017 14:38:17 GMT

hello friend ,For this example the SoftDevice uses 8.11kB RAM..where to see this 8.11 value

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

Sigurd — Thu, 02 Mar 2017 14:23:22 GMT

No, you cannot calculate the RAM usage for the SoftDevice directly. The nrf51822QFAA has 16kB RAM. The RAM usage for the ANCS example code is ZI-data + RW-data = 8.953125 kB. For this example the SoftDevice uses 8,11kB RAM, so the total RAM usage is 17.07kB. If you turn off the NRF_LOG(set NRF_LOG_ENABLED to 0 in sdk_config.h) the total RAM usage is 15,3125 kB. Also, with the nrf51822QFAA you should set the start to 0x20002078 and the size to 0x1F88. You will almost have no extra RAM for your application, so if you want to add anything to the ANCS example, you should maybe buy a nRF51822 that have 32kB RAM.

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

FormerMember — Thu, 02 Mar 2017 13:56:40 GMT

hello friend,i see the Memory resource map and usage,but i still don't know why it should be 0x3440.i use nrf51822QFAA with 256KB flash and 16kb ram, and i download the SDK12.2.0 softdevice s130,and download the sdk12.2.0 ANCS project application,it can't run,the RAM and flash. RAM=ZI-data + RW-data.and in the SDK12.2.0 ANCS project.RAM=8480+504=8984=8.984KB flash=Code + RO-data + RW-data,and in the SDK12.2.0 ANCS project.flash=39772+1964+504=42240=42.24KB. i know because the RAM is not enough. but i don't know why it could be 0x3440.and the first time you answer my question with a web,i click it,there it say set it to be 0x20002078, it's also ok. i want to know is there any way that calculate the value without print out it？ because i use nrf51822QFAA,i can't debug now

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

FormerMember — Thu, 02 Mar 2017 10:35:52 GMT

ok thank you so much. O(∩_∩)O~

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

Sigurd — Thu, 02 Mar 2017 10:22:47 GMT

Yes, feel free to ask new questions, and I will do my best to answer them.

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

FormerMember — Thu, 02 Mar 2017 10:21:15 GMT

ok,tank you so much , i will look it,and if i have any question,can i ask you ? thank you again

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

Sigurd — Thu, 02 Mar 2017 10:15:05 GMT

Yes, you can find it when debugging, softdevice_enable() will tell you how much RAM the SoftDevice needs. The SoftDevice will use minimum 0x200013C8 + extra RAM for the services, characteristics, etc that are enabled by the application. You can read more about this here.

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

FormerMember — Thu, 02 Mar 2017 10:02:37 GMT

HELLO friend

i see the web,and the answer is "I'm not sure why 0x20003440 is used here, but you can safely change it to 0x20002078 and the size to 0x5F88."

there is no reason,can you tell me the detail? what address can set? is there any place can i find it?

RE: why SDK12.2.0 ANCS keil target RAM1:start is 0x20003340

Sigurd — Thu, 02 Mar 2017 08:49:44 GMT

Hi,

See this answer.