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comparison src/external_flash.asm @ 420:789230298511

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fix handling for new flash memory chip
author heinrichsweikamp
date Fri, 29 Apr 2016 15:38:57 +0200
parents 4389fe9673b2
children 3895adc3477f
comparison
equal deleted inserted replaced
419:881399cf0f5b 420:789230298511
64 btfss ext_flash_address+2,7 ; Rollover to 0xFFFFFF? 64 btfss ext_flash_address+2,7 ; Rollover to 0xFFFFFF?
65 return ; No, return 65 return ; No, return
66 clrf ext_flash_address+2 ; Set to 0x00FFFFF 66 clrf ext_flash_address+2 ; Set to 0x00FFFFF
67 setf ext_flash_address+1 67 setf ext_flash_address+1
68 setf ext_flash_address+0 68 setf ext_flash_address+0
69 return
70
71 global ext_flash_power_down
72 ext_flash_power_down:
73 movlw 0x04 ; Write disable
74 rcall write_spi
75 bsf flash_ncs ; CS=1
76 return 69 return
77 70
78 global ext_flash_byte_read_plus ; Return data read in WREG and SSP2BUF and 71 global ext_flash_byte_read_plus ; Return data read in WREG and SSP2BUF and
79 ext_flash_byte_read_plus: ; increase address after read 72 ext_flash_byte_read_plus: ; increase address after read
80 rcall ext_flash_byte_read 73 rcall ext_flash_byte_read
189 movlw 0x06 ; WREN command 182 movlw 0x06 ; WREN command
190 rcall write_spi 183 rcall write_spi
191 bsf flash_ncs ; CS=1 184 bsf flash_ncs ; CS=1
192 movlw 0x02 ; Write command 185 movlw 0x02 ; Write command
193 rcall write_spi 186 rcall write_spi
194 rcall ext_flash_write_address ; Write 24bit address ext_flash_address:3 via SPI 187 rcall ext_flash_write_address ; Write 24bit address ext_flash_address:3 via SPI
195 movf temp1,W ; load data byte 188 movf temp1,W ; load data byte
196 rcall write_spi ; write one byte of data! 189 rcall write_spi ; write one byte of data!
197 bsf flash_ncs ; CS=1 190 bsf flash_ncs ; CS=1
198 return 191 return
199 192
211 rcall write_spi 204 rcall write_spi
212 bsf flash_ncs ; CS=1 205 bsf flash_ncs ; CS=1
213 206
214 ; unlock new memory 207 ; unlock new memory
215 ; bsf flash_ncs ; CS=1 208 ; bsf flash_ncs ; CS=1
209 ; movlw 0x06 ; WREN command
210 ; rcall write_spi
211 ; bsf flash_ncs ; CS=1
212 ; movlw 0x98 ; ULBPR command
213 ; rcall write_spi
214 ; bsf flash_ncs ; CS=1
215
216 ;bsf flash_ncs ; CS=1
216 movlw 0x06 ; WREN command 217 movlw 0x06 ; WREN command
217 rcall write_spi 218 rcall write_spi
218 bsf flash_ncs ; CS=1 219 bsf flash_ncs ; CS=1
219 movlw 0x98 ; ULBPR command 220 movlw 0x42 ; WBPR command
220 rcall write_spi 221 rcall write_spi
221 bsf flash_ncs ; CS=1 222 movlw .18
223 movwf temp1
224 ext_flash_disable_protection2:
225 movlw 0x00
226 rcall write_spi
227 decfsz temp1,F ; 18 bytes with 0x00
228 bra ext_flash_disable_protection2
229 bsf flash_ncs ; CS=1
222 return 230 return
223 231
224 global ext_flash_enable_protection 232 global ext_flash_enable_protection
225 ext_flash_enable_protection: 233 ext_flash_enable_protection:
226 ; lock old memory 234 ; lock old memory