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十七、从0开始卷出一个新项目之瑞萨RZN2L定时器(GPT)+DMA生成PWM的运动控制

news 来源：原创 2025/6/17 20:03:27

一、概述

嵌入式科普(34)通过对比看透DMA的本质
分享瑞萨RZN2L使用DMA生成PWM的运动控制的例程源码
rzn2l必要的外设资源：
- rzn2l拥有32-bit timer General PWM Timer (GPT) with 18 channels
- CPU、GPT最高频率400Mhz
- DMAC0 and DMAC1 8 channels + 8 channels
- 还有cmt、cmtw、mtu3等其他定时器
- ESC控制器

二、工程源码

__asm volatile ("cpsie i");

    g_timer0.p_api->open(g_timer0.p_ctrl, g_timer0.p_cfg);
    g_timer0.p_api->enable(g_timer0.p_ctrl);
    g_timer0.p_api->start(g_timer0.p_ctrl);

    g_transfer0.p_api->open(g_transfer0.p_ctrl, g_transfer0.p_cfg);

    g_transfer0_ctrl.p_cfg->p_info->p_src = (void*)&buf_left[0];
    g_transfer0_ctrl.p_cfg->p_info->p_dest = (void*)&g_timer0_ctrl.p_reg->GTPBR;//(void*)&buf_des[0];//(void*)&g_timer0_ctrl.p_reg->GTPBR;
    g_transfer0_ctrl.p_cfg->p_info->length = 40;
    g_transfer0.p_api->reconfigure(g_transfer0.p_ctrl, g_transfer0_ctrl.p_cfg->p_info);

    g_transfer0.p_api->enable(g_transfer0.p_ctrl);
    g_transfer0.p_api->softwareStart(g_transfer0.p_ctrl, (transfer_start_mode_t)0);