Sure, I can give you some advice BUTTTTTT my friends always laugh at me when I say I’m better at blocking Cammy because of all her unblockables. Here are some important tips for the Ryu vs Cammy matchup.
Cammy has a lot of frame traps, therefore one of your friends in this matchup needs to be learning the cr.MP, crouching tech. Which is just hitting tech plus medium punch. If she grabs you tech, if not, youre MP comes out. But the issue with this is, with her tiger knee air ex cannon strike, she will frame trap you when you try to tech or mp and then you either eat a massive combo or she ultras or knocks you down and her vortex begins.
On blocking: As you mentioned, you dont want to quick rise. Also, unless you’re in the corner, it is extremely hard and rare to cross up with her air cannon spike at midscreen, therefore, unless she is doing the cross up light (which her jump is slow and you should have time to block); You almost always want to block backwards. The only time at midscreen you generally need to worry is on a backthrow, and then she will dash (twice?) i forget.
On DP: You absolutely need to establish your dp game. Therefore in the air, when cammy is going for her air cannon strike, you need to react and DP it. This is important to keep her from jumping in, and usually you wanna use MP so that it doesnt trade unless you’re in the corner with your U1.
On fireball/hado spacing: Your fireball and hado game needs to be freakishly good in this game, because to be honest if she has bar she can just ex cannon drill right through your fireball and if she has U1 then any dash will = you getting ultra and probably losing LOL. You need to make sure your hado are basically used as pokes/spacing to dp but if she has U1 forget about it unless your hado is EXTREMELY unpredictable which honestly risk reward is not worth it.
Things to learn to help the matchup: If you get spacing properly you can be in a pocket where you can punish her whiffed crouching poke (cr.mk i think) with either sweeps which is advised or at least Hado’s. Cammy you CAN safe jump her and alot of the time cammy because she has a great backdash, you can option select her into either ultra or AT LEAST with cr.lp xx sweep. Be careful when she has two meter for her cannon spike FADC. Learn option selects and safe jumps on her will really help.
General punishes: Most of the time your safe jumps and her ground cannon drill/spikes are going to be the two main things you punish. If you can punish her air cannon with MPxxFADC (on reaction) ultra that should be a priority. Otherwise, if she misses any of the other moves, you can push the cannon spike with sweep into safe jump or if you’re lucky Solar Plexus into combo. Otherwise, the cannon drill you usually punish with either cr.mpxxcr.hpxxHP.SRK or otherwise the fadc to ultra or if you want sweep, MPxxMPxxSweep which you follow up with safe jumps…
THATS BEST I GOT FOR NOW. LET ME KNOW IF YOU HAVE ANY QUESTIONS. THIS MATCHUP IS HARD!!! CAMMY IS ONE OF THE BEST CHARS IN THE GAME. LEARN WHEN TO TECH, HOW/WHEN to DP AND WHEN NOT TO FIREBALL AS WELL AS WHICH WAY TO BLOCK.