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十八、从0开始卷出一个新项目之瑞萨RZN2L使用ADC+DMA接收数据流

news 2025/9/11 5:41:11

一、概述

二、对比stm32 adc+dma“双buf模式”

三、瑞萨rzn2l dma寄存器模式(双配置模式)

四、例程源码

五、总结

一、概述

嵌入式科普(34)通过对比看透DMA的本质
如何高效的、无损的接收adc的连续数据流，分享RZN2L使用DMA连续接收ADC数据的例程源码
对比stm32 dma所谓的“循环/双buf模式”，和TI dma所的的“pingpong模式”。rzn2l如何实现？优劣势又是什么？

二、对比stm32 adc+dma“双buf模式”

网上非常多的文章介绍，其核心就是DMA的“循环/双buf模式”
https://blog.csdn.net/sherlock_cp/article/details/128308375

三、瑞萨rzn2l dma寄存器模式(双配置模式)

但是rzn2l dma没有“循环/双buf模式”
如何按照“双buf模式”，去分析dma框图，很可能会造成思路混乱、逻辑不通。因为只有一张单方向传输的框图。
个人总结rzn2l dma的“双buf模式”应该叫“双配置模式”

四、例程源码

__asm volatile ("cpsie i");// Must be before dma cfg!!!!!!!!!!!!g_adc103.p_api->open(g_adc103.p_ctrl, g_adc103.p_cfg);#if ENABLE_DMAg_transfer0.p_api->open(g_transfer0.p_ctrl, g_transfer0.p_cfg);g_transfer0_ctrl.p_cfg->p_info->p_src = (void*)&g_adc103_ctrl.p_reg->ADDR[3];g_transfer0_ctrl.p_cfg->p_info->p_dest = (void*)&adc_dest0[0];g_transfer0_ctrl.p_cfg->p_info->length = sizeof(g_adc103_ctrl.p_reg->ADDR[3]) * BUF_LEN;
#if 1g_transfer0_ctrl.p_cfg->p_info->p_next1_src = (void*)&g_adc103_ctrl.p_reg->ADDR[3];g_transfer0_ctrl.p_cfg->p_info->p_next1_dest = (void*)&adc_dest1[0];g_transfer0_ctrl.p_cfg->p_info->next1_length = sizeof(g_adc103_ctrl.p_reg->ADDR[3]) * BUF_LEN;
#endifg_transfer0.p_api->reconfigure(g_transfer0.p_ctrl, g_transfer0_ctrl.p_cfg->p_info);//reconfigure auto enable dma//g_transfer0.p_api->enable(g_transfer0.p_ctrl);//g_transfer0.p_api->softwareStart(g_transfer0.p_ctrl, (transfer_start_mode_t)0);
#endifg_adc103.p_api->scanCfg(g_adc103.p_ctrl, g_adc103.p_channel_cfg);g_adc103.p_api->scanStart(g_adc103.p_ctrl);

void g_transfer0CB(transfer_callback_args_t *p_args)
{(void)(p_args);dma_end_flg++;//To perform transfers in series, write 1 to the REN bit in the CHCFG_n register immediately!!!//So you can't resume debugging from the pause!!!//p_instance_ctrl->p_reg->GRP[group].CH[channel].CHCFG_b.REN = 1;g_transfer0_ctrl.p_reg->GRP[0].CH[0].CHCFG_b.REN = 1;if(dma_end_flg == 1){//todo:data parse}else if(dma_end_flg == 2){dma_end_flg = 0;//todo:data parse}return;
}