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comparison src/external_flash.asm @ 633:690c48db7b5b

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3.09 beta 2 release
author heinrichsweikamp
date Thu, 05 Mar 2020 15:06:14 +0100
parents 185ba2f91f59
children 4050675965ea
comparison
equal deleted inserted replaced
632:0347acdf6d8e 633:690c48db7b5b
172 ; write-range function, to be used through macro 172 ; write-range function, to be used through macro
173 ; 173 ;
174 global ext_flash_write_range 174 global ext_flash_write_range
175 ext_flash_write_range: 175 ext_flash_write_range:
176 movwf eeprom_loop ; load loop counter (eeprom variable used here) 176 movwf eeprom_loop ; load loop counter (eeprom variable used here)
177
178 ; btfsc flash_block_write ; does the FLASH support block-write?
179 ; bra ext_flash_write_range_block ; YES - write date via block operation
180 ; ;bra ext_flash_write_range_seq ; NO - write data via sequential single writes
181
182 ext_flash_write_range_seq: ; sequential write
183 ext_flash_write_range_loop_s:
184 movff POSTINC1,ext_flash_rw ; read byte from memory to ext_flash_rw
185 rcall ext_flash_byte_write ; write byte from ext_flash_rw to FLASH
186 rcall incf_ext_flash_address_p1_0x40 ; increase address with wrap-around at 0x400000
187 decfsz eeprom_loop,F ; decrement loop counter, all done?
188 bra ext_flash_write_range_loop_s ; NO - continue loop
189 return ; YES - done
190
191 ext_flash_write_range_block: ; block write
177 movff POSTINC1,ext_flash_rw ; read first byte from memory 192 movff POSTINC1,ext_flash_rw ; read first byte from memory
178 rcall ext_flash_write_block_start ; write first byte to FLASH 193 rcall ext_flash_write_block_start ; write first byte to FLASH
179 bra ext_flash_write_range_loop_start; jump into loop 194 bra ext_flash_write_range_loop_start; jump into loop
180 ext_flash_write_range_loop: 195 ext_flash_write_range_loop_b:
181 movff POSTINC1,ext_flash_rw ; read next byte from memory 196 movff POSTINC1,ext_flash_rw ; read next byte from memory
182 rcall ext_flash_write_block ; write next byte to FLASH 197 rcall ext_flash_write_block ; write next byte to FLASH
183 ext_flash_write_range_loop_start: 198 ext_flash_write_range_loop_start:
184 decfsz eeprom_loop,F ; decrement loop counter, all done? 199 decfsz eeprom_loop,F ; decrement loop counter, all done?
185 bra ext_flash_write_range_loop ; NO - continue loop 200 bra ext_flash_write_range_loop_b ; NO - continue loop
186 bra ext_flash_write_block_stop ; YES - end writing to flash (and return) 201 bra ext_flash_write_block_stop ; YES - end writing to flash (and return)
187 202
188 ; ---------------------------------------------------------------------------- 203 ; ----------------------------------------------------------------------------
189 204
190 ; global write_byte_ext_flash_plus_header 205 ; global write_byte_ext_flash_plus_header
191 ; write_byte_ext_flash_plus_header: 206 ; write_byte_ext_flash_plus_header:
192 ; movwf ext_flash_rw ; store byte to write 207 ; movwf ext_flash_rw ; store byte to write
193 ; ; test if write is done at first byte of 4kB block, if yes delete 4kB block first 208 ; ; test if write is done at first byte of 4kB block, if yes delete 4kB block first
194 ; tstfsz ext_flash_address+0 ; at 0x....00 ? 209 ; tstfsz ext_flash_address+0 ; at 0x....00 ?