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< span class = "edit-link" style = "font-size:12px; opacity:0.6; text-align:right; vertical-align:middle" > < a target = "_blank" href = "http://aicdocco/taskstopics/sdk/dma/dma-demo-lite.dita" > Edit online< / a > < / span > < h1 class = "- topic/title title topictitle1" id = "ariaid-title1" > Demo< / h1 >
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< div class = "date inPage" > 16 May 2025< / div > < div style = "color: gray;" >
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Read time: 6 minute(s)
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< section class = "- topic/section section" id = "demo__section_fgt_2zf_f1c" data-ofbid = "demo__section_fgt_2zf_f1c" > < h2 class = "- topic/title title sectiontitle" > Mem to Device< / h2 >
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< div class = "- topic/p p" data-ofbid = "d54179e41__20250519091507" > SPI 驱动（详见
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< span class = "+ topic/ph sw-d/filepath ph filepath" > bsp/artinchip/hal/qspi/aic_hal_qspi.c< / span > ）中调用了 DMA 进行数据传输，其使用过程可以当作 Demo 参考：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "demo__codeblock_wqc_3qs_c1c" data-ofbid = "demo__codeblock_wqc_3qs_c1c" > < strong class = "hl-keyword" > static< / strong > s32 qspi_tx_rx_dma(u32 base, u8 *tx, u32 txlen, u8 *rx, u32 rxlen)
{
u32 poll_time, single_len;
s32 ret = < span class = "hl-number" > 0< / span > ;
single_len = < span class = "hl-number" > 0< / span > ;
< strong class = "hl-keyword" > struct< / strong > aic_dma_chan *rx_dma, *tx_dma;
< strong class = "hl-keyword" > struct< / strong > dma_slave_config dmacfg;
qspi_reset_fifo(base);
tx_dma = NULL;
rx_dma = NULL;
< strong class = "hl-keyword" > if< / strong > (tx) {
spi_setbits(FCR_BIT_TX_DMA_EN, SPI_REG_FCR(base));
< strong class = "hl-keyword" > if< / strong > (qspi_in_single_mode(base))
single_len = txlen;
qspi_set_xfer_cnt(base, txlen, < span class = "hl-number" > 0< / span > , single_len, < span class = "hl-number" > 0< / span > );
tx_dma = hal_request_dma_chan();
< strong class = "hl-keyword" > if< / strong > (!tx_dma)
< strong class = "hl-keyword" > goto< / strong > out;
dmacfg.direction = DMA_MEM_TO_DEV;
dmacfg.src_addr = (< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )tx;
dmacfg.dst_addr = (< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )SPI_REG_TXD(base);
dmacfg.src_addr_width = DMA_SLAVE_BUSWIDTH_< span class = "hl-number" > 4< / span > _BYTES;
dmacfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_< span class = "hl-number" > 4< / span > _BYTES;
dmacfg.src_maxburst = < span class = "hl-number" > 1< / span > ;
dmacfg.dst_maxburst = < span class = "hl-number" > 1< / span > ;
dmacfg.slave_id = < span class = "hl-number" > 10< / span > ; < em class = "hl-comment" > // FIXME: should set id according spi id< / em >
ret = hal_dma_chan_config(tx_dma, & dmacfg);
< strong class = "hl-keyword" > if< / strong > (ret)
< strong class = "hl-keyword" > goto< / strong > out;
ret = hal_dma_chan_prep_device(
tx_dma, (uint32_t)(< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )SPI_REG_TXD(base),
(uint32_t)(< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )tx, txlen, DMA_MEM_TO_DEV);
< strong class = "hl-keyword" > if< / strong > (ret)
< strong class = "hl-keyword" > goto< / strong > out;
ret = hal_dma_chan_start(tx_dma);
< strong class = "hl-keyword" > if< / strong > (ret)
< strong class = "hl-keyword" > goto< / strong > out;
< em class = "hl-comment" > /* Start transfer */< / em >
spi_setbits(TCR_BIT_XCH, SPI_REG_TCR(base));
poll_time = < span class = "hl-number" > 0x7FFFFFFF< / span > ;
< strong class = "hl-keyword" > while< / strong > (!(readl(SPI_REG_ISR(base)) & ISR_BIT_TC)) {
poll_time--;
< strong class = "hl-keyword" > if< / strong > (poll_time == < span class = "hl-number" > 0< / span > ) {
ret = -< span class = "hl-number" > 1< / span > ;
spi_clrbits(FCR_BIT_TX_DMA_EN, SPI_REG_FCR(base));
hal_log_err(< span class = "hl-string" > "TX Transfer complete timeout at the end.\n"< / span > );
< strong class = "hl-keyword" > goto< / strong > out;
}
}
spi_setbits(ISR_BIT_TX_EMP, SPI_REG_ISR(base));
spi_setbits(ISR_BIT_TX_FULL, SPI_REG_ISR(base));
spi_setbits(ISR_BIT_TX_RDY, SPI_REG_ISR(base));
spi_setbits(ISR_BIT_TC, SPI_REG_ISR(base));
spi_clrbits(FCR_BIT_TX_DMA_EN, SPI_REG_FCR(base));
}
< strong class = "hl-keyword" > if< / strong > (rx) {
spi_setbits(FCR_BIT_RX_DMA_EN, SPI_REG_FCR(base));
qspi_set_xfer_cnt(base, < span class = "hl-number" > 0< / span > , rxlen, < span class = "hl-number" > 0< / span > , < span class = "hl-number" > 0< / span > );
rx_dma = hal_request_dma_chan();
< strong class = "hl-keyword" > if< / strong > (!rx_dma)
< strong class = "hl-keyword" > goto< / strong > out;
dmacfg.direction = DMA_DEV_TO_MEM;
dmacfg.src_addr = (< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )SPI_REG_RXD(base);
dmacfg.dst_addr = (< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )rx;
dmacfg.src_addr_width = DMA_SLAVE_BUSWIDTH_< span class = "hl-number" > 4< / span > _BYTES;
dmacfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_< span class = "hl-number" > 4< / span > _BYTES;
dmacfg.src_maxburst = < span class = "hl-number" > 1< / span > ;
dmacfg.dst_maxburst = < span class = "hl-number" > 1< / span > ;
dmacfg.slave_id = < span class = "hl-number" > 10< / span > ; < em class = "hl-comment" > // FIXME: should set id according spi id< / em >
ret = hal_dma_chan_config(rx_dma, & dmacfg);
< strong class = "hl-keyword" > if< / strong > (ret)
< strong class = "hl-keyword" > goto< / strong > out;
ret =
hal_dma_chan_prep_device(rx_dma, (uint32_t)(< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )rx,
(uint32_t)(< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )SPI_REG_RXD(base),
rxlen, DMA_DEV_TO_MEM);
< strong class = "hl-keyword" > if< / strong > (ret)
< strong class = "hl-keyword" > goto< / strong > out;
ret = hal_dma_chan_start(rx_dma);
< strong class = "hl-keyword" > if< / strong > (ret)
< strong class = "hl-keyword" > goto< / strong > out;
< em class = "hl-comment" > /* Start transfer */< / em >
spi_setbits(TCR_BIT_XCH, SPI_REG_TCR(base));
poll_time = < span class = "hl-number" > 0x7FFFFFFF< / span > ;
< strong class = "hl-keyword" > while< / strong > (!(readl(SPI_REG_ISR(base)) & ISR_BIT_TC)) {
poll_time--;
< strong class = "hl-keyword" > if< / strong > (poll_time == < span class = "hl-number" > 0< / span > ) {
ret = -< span class = "hl-number" > 1< / span > ;
spi_clrbits(FCR_BIT_TX_DMA_EN, SPI_REG_FCR(base));
hal_log_err(< span class = "hl-string" > "RX Transfer complete timeout at the end.\n"< / span > );
< strong class = "hl-keyword" > goto< / strong > out;
}
}
spi_setbits(ISR_BIT_TC, SPI_REG_ISR(base));
spi_setbits(ISR_BIT_RX_EMP, SPI_REG_ISR(base));
spi_setbits(ISR_BIT_RX_FULL, SPI_REG_ISR(base));
spi_setbits(ISR_BIT_RX_RDY, SPI_REG_ISR(base));
spi_clrbits(FCR_BIT_TX_DMA_EN, SPI_REG_FCR(base));
}
out:
< strong class = "hl-keyword" > if< / strong > (tx_dma) {
hal_dma_chan_stop(tx_dma);
hal_release_dma_chan(tx_dma);
}
< strong class = "hl-keyword" > if< / strong > (rx_dma) {
hal_dma_chan_stop(rx_dma);
hal_release_dma_chan(rx_dma);
}
< strong class = "hl-keyword" > return< / strong > ret;
}< / pre > < / div >
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< / section >
< section class = "- topic/section section" id = "demo__section_xnr_hzf_f1c" data-ofbid = "demo__section_xnr_hzf_f1c" > < h2 class = "- topic/title title sectiontitle" > Mem to Mem< / h2 >
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< div class = "- topic/p p" data-ofbid = "d54179e55__20250519091507" > 本 Demo 是 test_dma_memcpy
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的源码（< span class = "+ topic/ph sw-d/filepath ph filepath" > bsp/examples/test-dma/test_dma.c< / span > ），完成一次 Mem
的拷贝操作：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "demo__codeblock_cb5_3zf_f1c" data-ofbid = "demo__codeblock_cb5_3zf_f1c" > < strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > void< / strong > dma_test_cb(< strong class = "hl-keyword" > void< / strong > *param)
{
printf(< span class = "hl-string" > "DMA complete, callback....\n"< / span > );
}
< strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > void< / strong > cmd_test_dma_memcpy(< strong class = "hl-keyword" > int< / strong > argc, < strong class = "hl-keyword" > char< / strong > **argv)
{
< strong class = "hl-keyword" > struct< / strong > dma_chan *chan = NULL;
uint32_t test_len = < span class = "hl-number" > 0< / span > , align_len = < span class = "hl-number" > 0< / span > ;
< strong class = "hl-keyword" > char< / strong > *src = NULL, *dest = NULL;
< strong class = "hl-keyword" > int< / strong > ret, i;
uint32_t size = < span class = "hl-number" > 0< / span > ;
#ifdef RT_USING_POSIX_CLOCK
< strong class = "hl-keyword" > struct< / strong > timespec start, end;
#endif
< strong class = "hl-keyword" > if< / strong > (argc != < span class = "hl-number" > 2< / span > ) {
pr_err(< span class = "hl-string" > "Invalid parameter\n"< / span > );
< strong class = "hl-keyword" > return< / strong > ;
}
sscanf((< strong class = "hl-keyword" > char< / strong > *)argv[< span class = "hl-number" > 1< / span > ], < span class = "hl-string" > "%u"< / span > , & test_len);
test_len = roundup(test_len, < span class = "hl-number" > 8< / span > );
align_len = roundup(test_len, CACHE_LINE_SIZE);
src = aicos_malloc_align(< span class = "hl-number" > 0< / span > , align_len, CACHE_LINE_SIZE);
dest = aicos_malloc_align(< span class = "hl-number" > 0< / span > , align_len, CACHE_LINE_SIZE);
< strong class = "hl-keyword" > if< / strong > ((src == NULL) || (dest == NULL)){
pr_err(< span class = "hl-string" > "Alloc %d mem fail!\n "< / span > , align_len);
< strong class = "hl-keyword" > goto< / strong > free_mem;
}
printf(< span class = "hl-string" > "DMA memcpy test: src = 0x%lx, dest = 0x%lx, len = 0x%x\n"< / span > ,
(< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )src, (< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )dest, test_len);
< strong class = "hl-keyword" > for< / strong > (i = < span class = "hl-number" > 0< / span > ;i < test_len; i++)
src[i] = i & < span class = "hl-number" > 0xff< / span > ;
#ifdef RT_USING_POSIX_CLOCK
clock_gettime(CLOCK_REALTIME, & start);
#endif
chan = dma_request_channel();
< strong class = "hl-keyword" > if< / strong > (chan == NULL){
pr_err(< span class = "hl-string" > "Alloc dma chan fail!\n "< / span > );
< strong class = "hl-keyword" > goto< / strong > free_mem;
}
ret = dmaengine_prep_dma_memcpy(chan, (< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )dest, (< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > )src, test_len);
< strong class = "hl-keyword" > if< / strong > (ret){
pr_err(< span class = "hl-string" > "dmaengine_prep_dma_memcpy fail! ret = %d\n "< / span > , ret);
< strong class = "hl-keyword" > goto< / strong > free_chan;
}
ret = dmaengine_submit(chan, dma_test_cb, chan);
< strong class = "hl-keyword" > if< / strong > (ret){
pr_err(< span class = "hl-string" > "dmaengine_submit fail! ret = %d\n "< / span > , ret);
< strong class = "hl-keyword" > goto< / strong > free_chan;
}
dma_async_issue_pending(chan);
< strong class = "hl-keyword" > while< / strong > (dmaengine_tx_status(chan, & size) != DMA_COMPLETE);
aicos_dcache_invalid_range((< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > *)src, align_len);
aicos_dcache_invalid_range((< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > *)dest, align_len);
#ifdef RT_USING_POSIX_CLOCK
clock_gettime(CLOCK_REALTIME, & end);
#endif
< strong class = "hl-keyword" > for< / strong > (i = < span class = "hl-number" > 0< / span > ;i < test_len; i++){
< strong class = "hl-keyword" > if< / strong > (dest[i] != src[i]){
printf(< span class = "hl-string" > "addr 0x%x err: src - 0x%x, dest - 0x%x\n"< / span > ,
i, src[i], dest[i]);
ret = -< span class = "hl-number" > 1< / span > ;
}
}
< strong class = "hl-keyword" > if< / strong > (ret)
printf(< span class = "hl-string" > "DMA test fail!\n"< / span > );
< strong class = "hl-keyword" > else< / strong >
printf(< span class = "hl-string" > "DMA test succeed!\n"< / span > );
#ifdef RT_USING_POSIX_CLOCK
printf(< span class = "hl-string" > "DMA memcpy %u bytes, speed %.2f MB/s\n"< / span > , align_len,
(< strong class = "hl-keyword" > float< / strong > )align_len / < span class = "hl-number" > 1024< / span > / < span class = "hl-number" > 1024< / span > / time_diff(& start, & end));
#endif
free_chan:
< strong class = "hl-keyword" > if< / strong > (chan)
dma_release_channel(chan);
free_mem:
< strong class = "hl-keyword" > if< / strong > (src)
aicos_free_align(< span class = "hl-number" > 0< / span > , src);
< strong class = "hl-keyword" > if< / strong > (dest)
aicos_free_align(< span class = "hl-number" > 0< / span > , dest);
}< / pre > < / div >
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< / section >
< / div >
< / article > < / main > < / div >
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< / div >
< nav role = "navigation" id = "wh_topic_toc" aria-label = "On this page" class = "col-lg-2 d-none d-lg-block navbar d-print-none" >
< div id = "wh_topic_toc_content" >
< div class = " wh_topic_toc " > < div class = "wh_topic_label" > 在本页上< / div > < ul > < li class = "section-item" > < div class = "section-title" > < a href = "#demo__section_fgt_2zf_f1c" data-tocid = "demo__section_fgt_2zf_f1c" > Mem to Device< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#demo__section_xnr_hzf_f1c" data-tocid = "demo__section_xnr_hzf_f1c" > Mem to Mem< / a > < / div > < / li > < / ul > < / div >
< / div >
< / nav >
< / div >
< / div >
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< footer class = "navbar navbar-default wh_footer" >
< div class = " footer-container mx-auto " >
< title > footer def< / title >
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< style >
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.p1 {
font-family: FangZhengShuSong, Times, serif;
}
.p2 {
font-family: Arial, Helvetica, sans-serif;
}
.p3 {
font-family: "Lucida Console", "Courier New", monospace;
}
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< / style >
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< div class = "webhelp.fragment.footer" >
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< p class = "p1" > Copyright © 2019-2025 广东匠芯创科技有限公司. All rights reserved.< / p >
< / div >
< div >
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< div class = "generation_time" >
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Update Time: 2025-05-19
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< / div >
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< div id = "go2top" class = "d-print-none" >
< span class = "oxy-icon oxy-icon-up" > < / span >
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< div id = "modal_img_large" class = "modal" >
< span class = "close oxy-icon oxy-icon-remove" > < / span >
< div id = "modal_img_container" > < / div >
< div id = "caption" > < / div >
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< script src = "${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer = "defer" > < / script >
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