AN4253 datasheet(37/44 Pages) STMICROELECTRONICS

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DocID024255 Rev 2

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AN4253

asm examples

fccu_stcu_error:

// user code - handler of STCU errors

se_b .

// break due to STCU faults

fccu_analyze:

// user code - analyze FCCU faults, if there are any

// ...

se_b

fccu_clear

// continue with clear operation

fccu_clear:

// clear FCCU Critical faults CF

e_lis

r0, FCCU_CFK_KEY@h

e_or2i

r0, FCCU_CFK_KEY@l

e_stw

r0, FCCU_REG_CFK (r7)

// write Key to clear CF faults

e_stw

r3, FCCU_REG_CF (r7)

// clear known CF faults

.wait_cf_clear:

e_lwz

r0, FCCU_REG_CTRL (r7) // read FCCU_CTRL register

e_rlwinm r0,r0,26,30,31

// rotate OPS field and mask it

se_cmpi

r0, FCCU_OPS_SUCCESS

// look for OPS = SUCCESS

se_bc

00,02,.wait_cf_clear

// wait to finish the command

// clear FCCU Non-Critical faults (NCF)

e_lis

r0, FCCU_NCFK_KEY@h

e_or2i

r0, FCCU_NCFK_KEY@l

e_stw

r0, FCCU_REG_NCFK (r7) // write Key to clear CF faults

e_stw

r4, FCCU_REG_NCF (r7)

// clear known NCF faults

.wait_ncf_clear:

e_lwz

r0, FCCU_REG_CTRL (r7) // read FCCU_CTRL register

e_rlwinm r0,r0,26,30,31

// rotate OPS field and mask it

se_cmpi

r0, FCCU_OPS_SUCCESS

// look for OPS = SUCCESS

se_bc

00,02,.wait_ncf_clear

// wait to finish the command

// continue with next block

se_b

fccu_end

// no FCCU faults

fccu_no_fault:

e_lis r0,0

mtsprg0 r0

// save no CF fault to Core register

mtsprg1 r0

// save no CF fault to Core register

fccu_end:

A.6

RGM block

// Base address of RGM module to r7

e_lis

r7, RGM_BASE@h

e_or2i r7, RGM_BASE@l

// Read all RGM flags (FES+DES)

e_lwz

r0, RGM_REG_FESDES (r7)

mtsprg2 r0

// save reset flags to Core SPRG2 register

// destructive reset ?

e_lis

r1, RGM_DES_MASK@h

e_or2i

r1, RGM_DES_MASK@l

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