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E_Blue
Joined: 13 Apr 2011
Posts: 417
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| How to properly declare UART on PIC24FJ |
 Posted: Thu Apr 25, 2019 6:54 am |
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Device is PIC24FJ1024GB610
CCS V5.078
I'm trying to port a currently working code from PIC18F to PIC24FJ and can't figure out how to properly declare the UARTs
I'm using this code on PIC18F67J50
| Code: | #use rs232(UART1,stream=GSM,NOINIT)
#use rs232(UART2,stream=GPS,NOINIT)
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But in PIC24FJ doesn't work.
Can be something related to PPS? (Peripheral Pin Select)
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Electric Blue |
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temtronic
Joined: 01 Jul 2010
Posts: 9589
Location: Greensville,Ontario
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| Posted: Thu Apr 25, 2019 7:07 am |
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don't use that PIC but have seen a lot of posts.....
hint..
NEED to declare the PPS stuff BEFORE the UARTs....
try 'searching' , there's posts here about it....even a 'sticky' !
Jay |
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E_Blue
Joined: 13 Apr 2011
Posts: 417
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| Posted: Thu Apr 25, 2019 7:13 am |
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Yes, I added the following code and works ok.
| Code: | #pin_select U1TX=PIN_B6
#pin_select U1RX=PIN_B7
#pin_select U2TX=PIN_B0
#pin_select U2RX=PIN_B1
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Now I'm must to port a lot of #asm code to C.
There is more than 100 #asm #endasm in the code, this is going to take some time. 
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Electric Blue |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19967
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| Posted: Thu Apr 25, 2019 8:46 am |
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Yes. What does the ASM actually 'do'?. 90% of ASM can be done instead with
#byte and #bit and C code. The only stuff that can't, is going to be radically
different on a PIC24 (different instruction set...). |
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jeremiah
Joined: 20 Jul 2010
Posts: 1401
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| Posted: Thu Apr 25, 2019 8:03 pm |
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| E_Blue wrote: | Yes, I added the following code and works ok.
| Code: | #pin_select U1TX=PIN_B6
#pin_select U1RX=PIN_B7
#pin_select U2TX=PIN_B0
#pin_select U2RX=PIN_B1
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Quick note. If I remember correctly we use this chip on our dev board (or a close relative if not). You only have to specify PPS for Uarts 1,2,3, and 4. Uart 5 and Uart6 are hard pinned and won't need PPS. |
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