hs模式 mmc->host_caps = MMC_MODE_4BIT | MMC_MODE_HS_52MHz | MMC_MODE_HS; #if defined(USE_MMC0_8BIT) || defined(USE_MMC2_8BIT) mmc->host_caps |= MMC_MODE_8BIT; #endif 最小工作平率 mmc->f_min = 400000; mmc->f_max = 52000000; mmc_host[channel].clock = 0; //系统...
300000, 200000, 100000 }for(i =0; i < ARRAY_SIZE(freqs); i++) {if(!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))break;if(freqs[i] <= host->f_min)break;
mmc->ops = &sh_mmcif_ops; - mmc->f_max = host->clk; + mmc->f_max = host->clk / 2; /* close to 400KHz */ - if (mmc->f_max < 51200000) - mmc->f_min = mmc->f_max / 128; - else if (mmc->f_max < 102400000) - mmc->f_min = mmc->f_max / 256; + if (ho...
>>> /* close to 400KHz */ >>> - if (mmc->f_max < 51200000) >>> - mmc->f_min = mmc->f_max / 128; >>> - else if (mmc->f_max < 102400000) >>> - mmc->f_min = mmc->f_max / 256; >>> + if (host->clk < 51200000) >>> + mmc->f_min = host->clk / 128...
if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) break; if (freqs[i] <= host->f_min) break; } mmc_release_host(host); out: if (host->caps & MMC_CAP_NEEDS_POLL) mmc_schedule_delayed_work(&host->detect, HZ); ...
mmc_rescan_try_freq(host, max(freqs[i], host->f_min) //core/core.c //传进来第1个参数为:struct mmc_host *host mmc_power_up(host, host->ocr_avail); //core/core.c //host->ocr_avail在控制器驱动中指定的。此函数流程在上边有。
freq = host->f_max; }//进行卡初始化,卡初始化时时钟频率不能超过400KHzif(!mmc_rescan_try_freq(host, max(freq, host->f_min)))break;if(freqs[i] <= host->f_min)break; } mmc_release_host(host); out:if(host->caps & MMC_CAP_NEEDS_POLL) ...
[ 256.130819] Normal free:3596kB min:2708kB low:3384kB high:4060kB active_anon:51436kB inactive_anon:10392kB active_file:199200kB inactive_file:201096kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:524288kB managed:508836kB mlocked:0kB dirty:26348kB writeback:42628kB mapped...
本文讲解SD卡上电的步骤: 主机应为卡供电,以使电压在250ms内达到Vdd_min,并且开始向SD卡提供至少74个SD时钟,同时保持CMD线为高电平。如果是SPI模式下,CS应在74个时钟周期内保持高电平。 •通电后(包括热插入,即在总线运行时插入卡)SD卡进入空闲状态。对于SD主机,则不需要CMD0。如果是SPI主机,则CMD0为将卡...
f 的两端)控制为来自每个换流器桥臂3的电流控制器的预定电压参考。 [0061] 2.电流源模式,其中该单元充当电流源换流器(csc),即,控制由单元4注入其换流器桥臂3中的输出电流io。 [0062] 可通过使用电流控制器来控制电感器l f 电流il的大小和方向,以控制初级储能器c ...