基于库函数的SD卡硬件驱动层代码实现方案
嵌入式开发中经常会用到对外部sd卡进行相关的读写操作。下图是cpu硬件连接示意图
cpu硬件连接 引脚配置瑞如下：
void sd_lowlevel_deinit(void){ gpio_inittypedef gpio_initstructure; /*!< disable sdio clock */ sdio_clockcmd(disable); /*!< set power state to off */ sdio_setpowerstate(sdio_powerstate_off); /*!< deinitializes the sdio peripheral */ sdio_deinit(); /*!< disable the sdio ahb clock */ rcc_ahbperiphclockcmd(rcc_ahbperiph_sdio, disable); /*!< configure pc.08, pc.09, pc.10, pc.11, pc.12 pin: d0, d1, d2, d3, clk pin */ gpio_initstructure.gpio_pin = gpio_pin_8 | gpio_pin_9 | gpio_pin_10 | gpio_pin_11 | gpio_pin_12; gpio_initstructure.gpio_mode = gpio_mode_in_floating; gpio_init(gpioc, &gpio_initstructure); /*!< configure pd.02 cmd line */ gpio_initstructure.gpio_pin = gpio_pin_2; gpio_init(gpiod, &gpio_initstructure);}
dma部分配置如下:
void sd_lowlevel_dma_txconfig(uint32_t *buffersrc, uint32_t buffersize){ dma_inittypedef dma_initstructure; dma_clearflag(sd_sdio_dma_flag_tc | sd_sdio_dma_flag_te | sd_sdio_dma_flag_ht | sd_sdio_dma_flag_gl); /*!< dma2 channel4 disable */ dma_cmd(sd_sdio_dma_channel, disable); /*!< sdio dma channel config */ dma_initstructure.dma_peripheralbaseaddr = (uint32_t)sdio_fifo_address; dma_initstructure.dma_memorybaseaddr = (uint32_t)buffersrc; dma_initstructure.dma_dir = dma_dir_peripheraldst; dma_initstructure.dma_buffersize = buffersize / 4; dma_initstructure.dma_peripheralinc = dma_peripheralinc_disable; dma_initstructure.dma_memoryinc = dma_memoryinc_enable; dma_initstructure.dma_peripheraldatasize = dma_peripheraldatasize_word; dma_initstructure.dma_memorydatasize = dma_memorydatasize_word; dma_initstructure.dma_mode = dma_mode_normal; dma_initstructure.dma_priority = dma_priority_high; dma_initstructure.dma_m2m = dma_m2m_disable; dma_init(sd_sdio_dma_channel, &dma_initstructure); dma_itconfig(sd_sdio_dma_channel, dma_it_tc, enable); /*!< sdio dma channel enable */ dma_cmd(sd_sdio_dma_channel, enable); }void sd_lowlevel_dma_rxconfig(uint32_t *bufferdst, uint32_t buffersize){ dma_inittypedef dma_initstructure; dma_clearflag(sd_sdio_dma_flag_tc | sd_sdio_dma_flag_te | sd_sdio_dma_flag_ht | sd_sdio_dma_flag_gl); /*!< sdio dma channel disable */ dma_cmd(sd_sdio_dma_channel, disable); /*!< sdio dma channel config */ dma_initstructure.dma_peripheralbaseaddr = (uint32_t)sdio_fifo_address; dma_initstructure.dma_memorybaseaddr = (uint32_t)bufferdst; dma_initstructure.dma_dir = dma_dir_peripheralsrc; dma_initstructure.dma_buffersize = buffersize / 4; dma_initstructure.dma_peripheralinc = dma_peripheralinc_disable; dma_initstructure.dma_memoryinc = dma_memoryinc_enable; dma_initstructure.dma_peripheraldatasize = dma_peripheraldatasize_word; dma_initstructure.dma_memorydatasize = dma_memorydatasize_word; dma_initstructure.dma_mode = dma_mode_normal; dma_initstructure.dma_priority = dma_priority_high; dma_initstructure.dma_m2m = dma_m2m_disable; dma_init(sd_sdio_dma_channel, &dma_initstructure); dma_itconfig(sd_sdio_dma_channel, dma_it_tc, enable); /*!< sdio dma channel enable */ dma_cmd(sd_sdio_dma_channel, enable); } uint32_t sd_dmaendoftransferstatus(void){ return (uint32_t)dma_getflagstatus(dma2_flag_tc4);} sdio函数中断部分
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cpu硬件连接 引脚配置瑞如下：
void sd_lowlevel_deinit(void){ gpio_inittypedef gpio_initstructure; /*!< disable sdio clock */ sdio_clockcmd(disable); /*!< set power state to off */ sdio_setpowerstate(sdio_powerstate_off); /*!< deinitializes the sdio peripheral */ sdio_deinit(); /*!< disable the sdio ahb clock */ rcc_ahbperiphclockcmd(rcc_ahbperiph_sdio, disable); /*!< configure pc.08, pc.09, pc.10, pc.11, pc.12 pin: d0, d1, d2, d3, clk pin */ gpio_initstructure.gpio_pin = gpio_pin_8 | gpio_pin_9 | gpio_pin_10 | gpio_pin_11 | gpio_pin_12; gpio_initstructure.gpio_mode = gpio_mode_in_floating; gpio_init(gpioc, &gpio_initstructure); /*!< configure pd.02 cmd line */ gpio_initstructure.gpio_pin = gpio_pin_2; gpio_init(gpiod, &gpio_initstructure);}
dma部分配置如下:
void sd_lowlevel_dma_txconfig(uint32_t *buffersrc, uint32_t buffersize){ dma_inittypedef dma_initstructure; dma_clearflag(sd_sdio_dma_flag_tc | sd_sdio_dma_flag_te | sd_sdio_dma_flag_ht | sd_sdio_dma_flag_gl); /*!< dma2 channel4 disable */ dma_cmd(sd_sdio_dma_channel, disable); /*!< sdio dma channel config */ dma_initstructure.dma_peripheralbaseaddr = (uint32_t)sdio_fifo_address; dma_initstructure.dma_memorybaseaddr = (uint32_t)buffersrc; dma_initstructure.dma_dir = dma_dir_peripheraldst; dma_initstructure.dma_buffersize = buffersize / 4; dma_initstructure.dma_peripheralinc = dma_peripheralinc_disable; dma_initstructure.dma_memoryinc = dma_memoryinc_enable; dma_initstructure.dma_peripheraldatasize = dma_peripheraldatasize_word; dma_initstructure.dma_memorydatasize = dma_memorydatasize_word; dma_initstructure.dma_mode = dma_mode_normal; dma_initstructure.dma_priority = dma_priority_high; dma_initstructure.dma_m2m = dma_m2m_disable; dma_init(sd_sdio_dma_channel, &dma_initstructure); dma_itconfig(sd_sdio_dma_channel, dma_it_tc, enable); /*!< sdio dma channel enable */ dma_cmd(sd_sdio_dma_channel, enable); }void sd_lowlevel_dma_rxconfig(uint32_t *bufferdst, uint32_t buffersize){ dma_inittypedef dma_initstructure; dma_clearflag(sd_sdio_dma_flag_tc | sd_sdio_dma_flag_te | sd_sdio_dma_flag_ht | sd_sdio_dma_flag_gl); /*!< sdio dma channel disable */ dma_cmd(sd_sdio_dma_channel, disable); /*!< sdio dma channel config */ dma_initstructure.dma_peripheralbaseaddr = (uint32_t)sdio_fifo_address; dma_initstructure.dma_memorybaseaddr = (uint32_t)bufferdst; dma_initstructure.dma_dir = dma_dir_peripheralsrc; dma_initstructure.dma_buffersize = buffersize / 4; dma_initstructure.dma_peripheralinc = dma_peripheralinc_disable; dma_initstructure.dma_memoryinc = dma_memoryinc_enable; dma_initstructure.dma_peripheraldatasize = dma_peripheraldatasize_word; dma_initstructure.dma_memorydatasize = dma_memorydatasize_word; dma_initstructure.dma_mode = dma_mode_normal; dma_initstructure.dma_priority = dma_priority_high; dma_initstructure.dma_m2m = dma_m2m_disable; dma_init(sd_sdio_dma_channel, &dma_initstructure); dma_itconfig(sd_sdio_dma_channel, dma_it_tc, enable); /*!< sdio dma channel enable */ dma_cmd(sd_sdio_dma_channel, enable); } uint32_t sd_dmaendoftransferstatus(void){ return (uint32_t)dma_getflagstatus(dma2_flag_tc4);} sdio函数中断部分
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