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POARM Assembly for development board
 

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    <p>I'm currently messing around with an LPC 2378 which has an application board attached. On the fan there are several components, 2 of which are a fan and a heater.</p> <p>If bits 6 and 7 of port 4 are connected to the fan (motor controller), the following code will turn on the fan:</p> <pre><code> FanOn STMFD r13!,{r0,r5,r14} ; Push r0, r5 and LR LDR R5, =FIO4PIN ; Address of FIO4PIN LDR r0, [r5] ; Read current Port4 ORR r0, r0, #0x80 STR r0, [r5] ; Output LDMFD r13!,{r0,r5,r14} ; Pop r0, r5 and LR mov pc, r14 ; Put link register back into PC </code></pre> <p>How can I rewrite this block of code to turn on a heater connected to bit 5 of port 4, (Setting the bit to 1 will turn it on, setting it to 0 will turn it off).</p> <p>Edit after answered question:</p> <pre><code>;============================================================================== ; Turn Heater On ;============================================================================== heaterOn STMFD r13!,{r0,r5,r14} ; Push r0, r5 and LR LDR R5, =FIO4PIN ; Address of FIO4PIN LDR r0, [r5] ; Read current Port4 ORR r0, r0, #0x20 STR r0, [r5] ; Output LDMFD r13!,{r0,r5,r14} ; Pop r0, r5 and LR mov pc, r14 ; Put link register back into PC ;============================================================================== ; Turn The Heater Off ;============================================================================== heaterOff STMFD r13!,{r0,r5,r14} ; Push r0, r5 and LR LDR R5, =FIO4PIN ; Address of FIO4PIN LDR r0, [r5] ; Read current Port4 AND r0, r0, #0xDF STR r0, [r5] ; Output LDMFD r13!,{r0,r5,r14} ; Pop r0, r5 and LR mov pc, r14 ; Put link register back into PC </code></pre>
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