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    <p>I am using UDATA_ACS to declare the variables I want in access, so in modem.asm I have</p> <pre><code>; Variables for the interrupt handler - Access RAM VarsModemISR UDATA_ACS wave_index res 1 ; Index into the wave table for current sample sample_period res 1 ; Sample period in use, TMR0 ticks sample_count res 1 ; Amount of samples output since last bit boundary fsrtmpl res 1 ; Temporary store for FSR fsrtmph res 1 ; Temporary store for FSR ; Variables for the modem code - GPR0, non-Access VarsModem UDATA flag res 1 ; Counter for transmitting AX25 flags bit res 1 ; Bit counter when transmitting a character ch res 1 ; Current character being transmitted ... </code></pre> <p>My current linker script uses the supplied script, but defines my segments. I note that there's only one program page defined in the script, unlike on the PIC16s. No more PAGESEL?</p> <pre><code>INCLUDE 18f14K50_g.lkr SECTION NAME=CodeModemISR ROM=page SECTION NAME=CodeModem ROM=page SECTION NAME=CodeWaveTable ROM=page SECTION NAME=CodeEepromUtil ROM=page SECTION NAME=VarsModem RAM=gpr0 SECTION NAME=VarsGPSState RAM=gpr0 SECTION NAME=CodeConfigEEPROM ROM=eedata </code></pre> <p>The resulting map contains the mappings I expect:</p> <p>Hard coded locations as expected:</p> <pre><code> HighInterruptVector code 0x000008 program 0x000004 LowInterruptVector code 0x000018 program 0x000002 </code></pre> <p>Movable locations packed in:</p> <pre><code> CodeModemISR code 0x00001a program 0x000028 CodeModem code 0x000042 program 0x0000fe CodeWaveTable code 0x000140 program 0x000040 CodeMain code 0x000180 program 0x000054 </code></pre> <p>EEPROM in the right place</p> <pre><code> CodeConfigEEPROM code 0xf00000 program 0x000044 </code></pre> <p>And variables in ACCESSRAM and GP0</p> <pre><code> VarsModemISR udata 0x000000 data 0x000005 VarsModem udata 0x000060 data 0x000027 VarsGPSState udata 0x000087 data 0x00000e </code></pre> <p>There are more problems to solve, but they may be in other posts. I note that CodeWaveTable is taking 64 bytes so it's not closely packed. Solution - use CODE_PACK and now it's 32 bytes.</p>
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    1. USRichard Corfield
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