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);

三、测试效果

四、总结

• rzn2l具备实现运动控制的重要资源，可实现1Mhz的效果

• 例程仅提供GPT+DMA的使用