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一个 NAND flash写函数
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一個剛看到時有點暈暈的flash的寫函數(shù)，后來仔細看了后明白了；附上我的草稿圖?
int?tls_fls_write(u32?addr,?u8?*buf,?u32?len)?? {?? ????u8?*cache;?? ????int?err;?? ????u32?sector_addr;?? ????u32?sector_num;?? ????u32?write_bytes;?? ????u32?i;?? ????struct?tls_fls_drv?*drv;?? ?? ????if?(spi_fls?==?NULL)?? ????{?? ????????TLS_DBGPRT_ERR("flash?driver?module?not?beed?installed!\n");?? ????????return?TLS_FLS_STATUS_EPERM;?? ????}?? ?????? ????if?(spi_fls->current_drv?==?NULL)?? ????{?? ????????TLS_DBGPRT_ERR("the?current?spi?flash?driver?not?installed!\n");?? ????????return?TLS_FLS_STATUS_ENODRV;?? ????}?? ?????? ????if?((addr?>=?spi_fls->current_drv->total_size)?||?(len?==?0)?? ????????||?(buf?==?NULL))?? ????{?? ????????return?TLS_FLS_STATUS_EINVAL;?? ????}?? ????tls_os_sem_acquire(spi_fls->fls_lock,?0);?? ????drv?=?spi_fls->current_drv;?? ????write_bytes?=?? ????????((addr?+?len)?>?drv->total_size)???(drv->total_size?-?addr)?:?len;?? ????sector_addr?=?addr/drv->sector_size;?? ????sector_num?=?(addr?+?write_bytes?-?1)/drv->sector_size?-?sector_addr?+?1;?? ?? ????TLS_DBGPRT_FLASH("write?to?flash:?sector?address?-?%d,?sectors?-?%d.\n",?sector_addr,?sector_num);?? ?????? ????err?=?TLS_FLS_STATUS_OK;?? ?? ????cache?=?tls_mem_alloc(drv->sector_size);?? ????if?(cache?==?NULL)?? ????{?? ????????tls_os_sem_release(spi_fls->fls_lock);?? ????????TLS_DBGPRT_ERR("allocate?sector?cache?memory(%dB)?fail!\n",?drv->sector_size);?? ????????return?TLS_FLS_STATUS_ENOMEM;?? ????}?? ?? ????for?(i?=?0;?i?<?sector_num;?i++)?? ????{?? ????????TLS_DBGPRT_FLASH("firstly,?read?the?sector?-?%d?to?cache.\n",?sector_addr?+?i);?? ????????err?=?drv->read((sector_addr?+?i)?*?drv->sector_size,?cache,?drv->sector_size);?? ????????if?(err?!=?TLS_FLS_STATUS_OK)?? ????????{?? ????????????tls_os_sem_release(spi_fls->fls_lock);?? ????????????TLS_DBGPRT_ERR("flash?read?fail(sector?%d)!\n",?(sector_addr?+?i));?? ????????????break;?? ????????}?? ?? ????????if?(1?==?sector_num){/*flash?write?only?in?one?sector*/?? ????????????MEMCPY(cache?+?(addr%drv->sector_size),?buf,?write_bytes);????? ????????????buf?+=?write_bytes;?? ????????????write_bytes?=?0;?????????????? ????????}else{/*flash?write?through?some?sectors*/?? ????????????if?(0?==?i)?{?? ????????????????MEMCPY(cache+(addr%drv->sector_size),?buf,?drv->sector_size?-?(addr%drv->sector_size));?? ????????????????buf?+=?drv->sector_size?-?(addr%drv->sector_size);?? ????????????????write_bytes?-=?drv->sector_size?-?(addr%drv->sector_size);?? ????????????}?else?if?(i?==?(sector_num?-?1))?{?? ????????????????MEMCPY(cache,?buf,?write_bytes);?? ????????????????buf?+=?write_bytes;?? ????????????????write_bytes?=?0;?? ????????????}?else?{?? ????????????????MEMCPY(cache,?buf,?drv->sector_size);?? ????????????????buf?+=?drv->sector_size;?? ????????????????write_bytes?-=?drv->sector_size;?? ????????????}?? ????????}?? ?? ????????TLS_DBGPRT_FLASH("second,?erase?the?sector?-?%d.\n",?sector_addr?+?i);?? ????????err?=?drv->erase(sector_addr?+?i);?? ????????if?(err?!=?TLS_FLS_STATUS_OK)?? ????????{?? ????????????tls_os_sem_release(spi_fls->fls_lock);?? ????????????TLS_DBGPRT_ERR("flash?erase?fail(sector?%d)!\n",?(sector_addr?+?i));?? ????????????break;?? ????????}?? ?? ????????TLS_DBGPRT_FLASH("finnaly,?write?the?data?in?cache?to?the?sector?-?%d.\n",?sector_addr?+?i);?? ????????err?=?tls_fls_page_write((sector_addr?+i)?*?(drv->sector_size?/?drv->page_size),?? ????????????????????????????cache,?drv->sector_size?/?drv->page_size);?? ????????if?(err?!=?TLS_FLS_STATUS_OK)?? ????????{?? ????????????tls_os_sem_release(spi_fls->fls_lock);?? ????????????TLS_DBGPRT_ERR("flash?write?fail(sector?%d)!\n",?(sector_addr?+?i));?? ????????????break;?? ????????}?? ????}?? ?? ????tls_mem_free(cache);?? ????tls_os_sem_release(spi_fls->fls_lock);?? ????return?err;?? } ?
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