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Continue development of MSP430X port.

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This commit is contained in:
Richard Barry 2010-12-28 18:40:12 +00:00
parent b20be831b7
commit e7e623f853
3 changed files with 21 additions and 24 deletions
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15
Source/portable/IAR/MSP430X/portext.s43
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@ -90,16 +90,23 @@ vTickISR:
*/
vPortYield:
/* Mimic an interrupt by pushing the SR. */
push SR
/* Mimic an interrupt by combining the SR and the PC, the latter having
already been pushed onto the stack. R14 is a scratch registers. */
popx.a r14 /* r14 will hold the 20 bit PC. */
push.w r14 /* Push just 16 bits of the 20bit PC back onto the stack. */
rram.a #4, r14 /* Move the top 4 bits of the PC down ready to be combined with the SP. */
and.w #0xf000, r14/* Ensure other bits are clear. */
add.w sr, r14 /* Combine the top 4 bits of the PC with the SR. */
push.w r14 /* Push the generated combined value onto the stack. */
/* Now the SR is stacked we can disable interrupts. */
dint
dint
nop
/* Save the context of the current task. */
portSAVE_CONTEXT
/* Switch to the highest priority task that is ready to run. */
/* Select the next task to run. */
calla #vTaskSwitchContext
/* Restore the context of the new task. */