From 1660b283c4e40687c8ff865a31c4cafbbc7904d3 Mon Sep 17 00:00:00 2001
From: FallenSigh <fallensigh@gmail.com>
Date: Wed, 24 Jun 2026 23:52:30 +0800
Subject: [PATCH] Move DMA files to asm/, remove from common.mk

---
 sdk/software/bsp/common.mk      |  3 +--
 sdk/software/examples/asm/dma.c | 37 +++++++++++++++++++++++++++++++++
 sdk/software/examples/asm/dma.h | 30 ++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 2 deletions(-)
 create mode 100644 sdk/software/examples/asm/dma.c
 create mode 100644 sdk/software/examples/asm/dma.h

diff --git a/sdk/software/bsp/common.mk b/sdk/software/bsp/common.mk
index 0878350..88764f5 100644
--- a/sdk/software/bsp/common.mk
+++ b/sdk/software/bsp/common.mk
@@ -39,8 +39,7 @@ C_SRCS   += $(COMMON_DIR)/drivers/core_time.c
 C_SRCS   += $(COMMON_DIR)/drivers/common_func.c
 C_SRCS   += $(COMMON_DIR)/drivers/dvi.c \
 			$(COMMON_DIR)/drivers/led.c \
-			$(COMMON_DIR)/drivers/seg7.c \
-			$(COMMON_DIR)/drivers/dma.c
+			$(COMMON_DIR)/drivers/seg7.c
 
 INCLUDES += -I./ \
 			-I$(COMMON_DIR)/include \
diff --git a/sdk/software/examples/asm/dma.c b/sdk/software/examples/asm/dma.c
new file mode 100644
index 0000000..551b725
--- /dev/null
+++ b/sdk/software/examples/asm/dma.c
@@ -0,0 +1,37 @@
+#include "dma.h"
+
+void dma_start_transfer(int ch_id, uint32_t src, uint32_t dst, uint32_t bytes, uint32_t tag) {
+    volatile dma_ch_regs_t* ch = DMA_CH(ch_id);
+
+    // 检查通道是否空闲 防止覆盖正在运行的任务
+    if (ch->STATUS & STATUS_BUSY_BIT) {
+        // printf("channel %d busy\n", ch_id);
+        return; // 通道正忙，处理报错或重试
+    }
+
+    // 写入基本地址和长度
+    ch->SRC_ADDR = src;
+    ch->DST_ADDR = dst;
+    ch->LENGTH   = bytes;
+    ch->TAG      = tag; // 可选，填入任务ID
+
+    // 置 Burst 属性并触发传输
+    // AXI SIZE: 2 (代表 2^2 = 4 Bytes，与 32-bit 数据线匹配)
+    // AXI LEN: 15 (代表 16 beats 突发传输，最高效)
+    uint32_t ctrl_val = CTRL_BURST_SIZE(2) | CTRL_BURST_LEN(15);
+    
+    // 写入 CTRL 并拉高 Bit 0 (Start)
+    ch->CTRL = ctrl_val | CTRL_START_BIT;
+}
+
+void dma_wait_polling(int ch_id) {
+    volatile dma_ch_regs_t* ch = DMA_CH(ch_id);
+    
+    // 死等 Done bit 置 1
+    while (!(ch->STATUS & STATUS_DONE_BIT)) {
+    }
+
+    // 清除 Done 标志位 (Write 1 to Clear Bit 1)
+    // 注意：写 1 清 0 的设计，所以我们对 bit 1 写入 1
+    ch->STATUS = STATUS_DONE_BIT; 
+}
\ No newline at end of file
diff --git a/sdk/software/examples/asm/dma.h b/sdk/software/examples/asm/dma.h
new file mode 100644
index 0000000..8187fb9
--- /dev/null
+++ b/sdk/software/examples/asm/dma.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdint.h>
+
+
+typedef struct {
+    volatile uint32_t SRC_ADDR;  // 0x00: 源地址
+    volatile uint32_t DST_ADDR;  // 0x04: 目的地址
+    volatile uint32_t LENGTH;    // 0x08: 传输总字节数
+    volatile uint32_t TAG;       // 0x0C: 软件 Tag (硬件不处理，留给软件标记任务用)
+    volatile uint32_t CTRL;      // 0x10: 控制寄存器 (配置 Burst 属性 + 启动)
+    volatile uint32_t STATUS;    // 0x14: 状态寄存器 (Busy, Done)
+    volatile uint32_t RESV[10];  // 0x18 ~ 0x3C: 保留空间，凑齐 0x40 字节
+} dma_ch_regs_t;
+
+// DMA 控制器基地址
+#define CDMA_MUX_BASE 0xbf300000
+#define DMA_CH(i)     ((volatile dma_ch_regs_t*)(CDMA_MUX_BASE + (i) * 0x40))
+
+// CTRL 寄存器位定义
+#define CTRL_START_BIT       (1 << 0)
+#define CTRL_BURST_SIZE(x)   (((x) & 0x7) << 3)  // Bits [5:3]: AXI AxSIZE (0=1B, 1=2B, 2=4B, 3=8B)
+#define CTRL_BURST_LEN(x)    (((x) & 0xFF) << 6) // Bits [13:6]: AXI AxLEN (0=1 beat, 15=16 beats)
+
+// STATUS 寄存器位定义
+#define STATUS_BUSY_BIT      (1 << 0)
+#define STATUS_DONE_BIT      (1 << 1)
+
+void dma_start_transfer(int ch_id, uint32_t src, uint32_t dst, uint32_t bytes, uint32_t tag);
+void dma_wait_polling(int ch_id);
\ No newline at end of file