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[color=rgba(0, 0, 0, 0.87)]本文介绍RTOS 中DMA 驱动的接口及使用方法，为DMA 的使用者提供参考。 [color=rgba(0, 0, 0, 0.87)]DMA 主要实现设备与设备、设备与 memory、memory 与 memory 之间的数据搬运与传输；BSP DMA 驱动主要实现设备驱动的底层细节，并为上层提供一套标准的 API 接口以供使用。 文档约定[color=rgba(0, 0, 0, 0.87)]数据 说明
DRQSRC_XXX源 DRQ 号
DRQDST_XXX目的 DRQ 号
模块配置 code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">Drivers Options —> soc related device drivers —> DMA Devices —> [* enable dma driver [* enable dma hal API test command源码结构 code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal/source/dma/ ---- 驱动源码├── hal_dma.c├── Kconfig├── Makefile├── platform│ └── dma-sun20iw3.h├── platform-dma.hinclude/hal/ ---- 驱动APIs声明头文件└── hal_dma.h驱动框架[color=rgba(0, 0, 0, 0.87)] [color=var(--md-typeset-a-color)]![]() [color=rgba(0, 0, 0, 0.87)]头文件： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">#include <hal_dma.h>#include <sunxi_hal_common.h>申请 DMA 通道[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_chan_status_t hal_dma_chan_request(struct sunxi_dma_chan **dma_chan)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_CHAN_STATUS_BUSY: 申请失败
- HAL_DMA_CHAN_STATUS_FREE: 申请成功
释放 DMA 通道[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_chan_free(struct sunxi_dma_chan *chan)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_ERROR: 失败
- HAL_DMA_STATUS_OK: 成功
释放 DMA 通道描述符[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_chan_desc_free(struct sunxi_dma_chan *chan)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_ERROR: 失败
- HAL_DMA_STATUS_OK: 成功
初始化环形 DMA 传输[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_prep_cyclic(struct sunxi_dma_chan *chan, uint32_t buf_addr, uint32_t buf_len, uint32_t period_len, enum dma_transfer_direction dir)[color=rgba(0, 0, 0, 0.87)]参数： - chan:DMA 通道结构体指针变量
- buf_addr: 数据缓冲区
- buf_len: 数据缓冲区长度
- period_len: 单次 DMA 搬运长度
- dir:DMA 传输方向
[color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_INVALID_PARAMETER: 参数非法
- HAL_DMA_STATUS_ERROR: 失败
- HAL_DMA_STATUS_OK: 成功
初始化 memory to memory DMA 传输[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_prep_memcpy(struct sunxi_dma_chan *chan, uint32_t dest, uint32_t src, uint32_t len)[color=rgba(0, 0, 0, 0.87)]参数： - chan:DMA 通道结构体指针变量
- dest: 目的地址
- src: 源地址
- len: 传输长度
[color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_INVALID_PARAMETER: 参数非法
- HAL_DMA_STATUS_ERROR: 失败
- HAL_DMA_STATUS_OK: 成功
初始化通用 DMA 传输[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_prep_device(struct sunxi_dma_chan *chan, uint32_t dest, uint32_t src, uint32_t len, enum dma_transfer_direction dir)[color=rgba(0, 0, 0, 0.87)]参数： - chan:DMA 通道结构体指针变量
- dest: 目的地址
- src: 源地址
- len: 传输长度
- dir:DMA 传输方向
[color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_INVALID_PARAMETER: 参数非法
- HAL_DMA_STATUS_ERROR: 失败
- HAL_DMA_STATUS_OK: 成功
注册 DMA 回调函数[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_callback_install(struct sunxi_dma_chan *chan, dma_callback callback, void *callback_param)[color=rgba(0, 0, 0, 0.87)]参数： - chan:DMA 通道结构体指针变量
- callback: 回调函数 handler
- callback_param: 回调函数传参
[color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_INVALID_PARAMETER: 参数非法
- HAL_DMA_STATUS_OK: 成功
配置 DMA 描述符传输信息[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_slave_config(struct sunxi_dma_chan *chan, struct dma_slave_config *config)[color=rgba(0, 0, 0, 0.87)]参数： - chan:DMA 通道结构体指针变量
- config:DMA 描述符结构体指针变量
[color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_INVALID_PARAMETER: 参数非法
- HAL_DMA_STATUS_OK: 成功
获取 DMA 发送状态[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">enum dma_status hal_dma_tx_status(struct sunxi_dma_chan *chan, uint32_t *left_size)[color=rgba(0, 0, 0, 0.87)]参数： - chan:DMA 通道结构体指针变
- left_size: 存放剩余长度的指针变量
[color=rgba(0, 0, 0, 0.87)]返回值： - DMA_INVALID_PARAMETER: 参数非法
- DMA_IN_PROGRESS: 正在进行
- DMA_COMPLETE: 传输完成
启动 DMA 传输[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_start(struct sunxi_dma_chan *chan)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_INVALID_PARAMETER: 参数非法
- HAL_DMA_STATUS_ERROR: 失败
- HAL_DMA_STATUS_OK: 成功
停止 DMA 传输[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">hal_dma_status_t hal_dma_stop(struct sunxi_dma_chan *chan)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： - HAL_DMA_STATUS_INVALID_PARAMETER: 参数非法
- HAL_DMA_STATUS_ERROR: 失败
- HAL_DMA_STATUS_OK: 成功
初始化 DMA 控制器驱动[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">void hal_dma_init(void)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： 申请一致性内存[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">void *dma_alloc_coherent(size_t size)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： 释放一致性内存[color=rgba(0, 0, 0, 0.87)]函数原型： code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">void dma_free_coherent(void *addr)[color=rgba(0, 0, 0, 0.87)]参数： [color=rgba(0, 0, 0, 0.87)]返回值： 调试节点模块使用范例 code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">#include <stdio.h>#include <stdlib.h>#include <string.h>#include <hal_log.h>#include <hal_cmd.h>#include <hal_mem.h>#include <hal_cache.h>#include <hal_dma.h>#include <sunxi_hal_common.h>#define DMA_TEST_LEN 1024static void dma_test_cb(void *param){ hal_log_info("DMA finished, callback to do something...\n");}int cmd_test_dma(int argc, char **argv){ int ret, i; struct sunxi_dma_chan *hdma = NULL; char *buf1 = NULL,*buf2 = NULL; struct dma_slave_config config = {0}; uint32_t size = 0; hal_log_info("run in dma test"); buf2 = dma_alloc_coherent(DMA_TEST_LEN); buf1 = dma_alloc_coherent(DMA_TEST_LEN); if (buf1 == NULL) { hal_log_err("malloc buf1 error!"); goto end; } if (buf2 == NULL) { hal_log_err("malloc buf2 error!"); goto end; } memset(buf1, 0, DMA_TEST_LEN); memset(buf2, 0, DMA_TEST_LEN); for (i = 0;i < DMA_TEST_LEN; i++) buf1[i = i & 0xff; hal_dcache_clean_invalidate((unsigned long)buf1, DMA_TEST_LEN); hal_dcache_clean_invalidate((unsigned long)buf2, DMA_TEST_LEN); /* request dma chan */ ret = hal_dma_chan_request(&hdma); if (ret == HAL_DMA_CHAN_STATUS_BUSY) { hal_log_err("dma channel busy!"); goto end; } /* register dma callback */ ret = hal_dma_callback_install(hdma, dma_test_cb, hdma); if (ret != HAL_DMA_STATUS_OK) { hal_log_err("register dma callback failed!"); goto end; } config.direction = DMA_MEM_TO_MEM; config.dst_addr_width = DMA_SLAVE_BUSWIDTH_8_BYTES; config.src_addr_width = DMA_SLAVE_BUSWIDTH_8_BYTES; config.dst_maxburst = DMA_SLAVE_BURST_16; config.src_maxburst = DMA_SLAVE_BURST_16; config.slave_id = sunxi_slave_id(DRQDST_SDRAM, DRQSRC_SDRAM); ret = hal_dma_slave_config(hdma, &config); if (ret != HAL_DMA_STATUS_OK) { hal_log_err("dma config error, ret:%d", ret); goto end; } ret = hal_dma_prep_memcpy(hdma, (unsigned long)buf2, (unsigned long)buf1, DMA_TEST_LEN); if (ret != HAL_DMA_STATUS_OK) { hal_log_err("dma prep error, ret:%d", ret); goto end; } ret = hal_dma_start(hdma); if (ret != HAL_DMA_STATUS_OK) { hal_log_err("dma start error, ret:%d", ret); goto end; } while (hal_dma_tx_status(hdma, &size)!= 0); ret = hal_dma_stop(hdma); if (ret != HAL_DMA_STATUS_OK) { hal_log_err("dma stop error, ret:%d", ret); goto end; } ret = hal_dma_chan_free(hdma); if (ret != HAL_DMA_STATUS_OK) { hal_log_err("dma free error, ret:%d", ret); goto end; } hal_dcache_invalidate((unsigned long)buf2, DMA_TEST_LEN); hal_log_info("src buf:\n"); for (i = 0;i < DMA_TEST_LEN; i++) { if (i % 16 == 0) printf("\n"); printf("%02x ", buf1[i); } printf("\n\n\n"); hal_log_info("dst buf:\n"); for (i = 0;i < DMA_TEST_LEN; i++) { if (i % 16 == 0) printf("\n"); printf("%02x ", buf2[i); } printf("\n\n\n"); if (memcmp(buf1, buf2, DMA_TEST_LEN) != 0) printf("dma test fail\n"); else printf("dma test pass\n");end: dma_free_coherent(buf1); dma_free_coherent(buf2); return 0;}FINSH_FUNCTION_EXPORT_CMD(cmd_test_dma, hal_dma, dma hal APIs tests)常见问题[color=rgba(0, 0, 0, 0.87)]确保传输内存使用 dma_alloc_coherent 申请
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