ZYNQ中使用AXI总线进行PS与PL的交互很方便，STM32可以使用FSMC模拟AXI交互，实测效果还不错，只不过AXI总线可以直接交互32位数据，STM32的FSMC一般只有8/16位，我使用的是16位的。先对FSMC初始化
#include "fsmc.h"
void FSMC_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure;
FSMC_NORSRAMTimingInitTypeDef readWriteTiming;
//时钟使能
RCC_AHB3PeriphClockCmd(RCC_AHB3Periph_FSMC, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOE | RCC_AHB1Periph_GPIOG, ENABLE);
//IO初始化
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_FSMC);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource0, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource1, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource3, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource4, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource7, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource10, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource11, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_FSMC);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 |
GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 |
GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource2 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource3 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource4 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource5 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource6 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource7 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource8 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource9 , GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource10, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource11, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource12, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource13, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource14, GPIO_AF_FSMC);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource15, GPIO_AF_FSMC);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 |
GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOE, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOG, GPIO_PinSource13, GPIO_AF_FSMC);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_Init(GPIOG, &GPIO_InitStructure);
//FSMC初始化
readWriteTiming.FSMC_AddressSetupTime = 1;
readWriteTiming.FSMC_AddressHoldTime = 0;
readWriteTiming.FSMC_DataSetupTime = 4;
readWriteTiming.FSMC_BusTurnAroundDuration = 0;
readWriteTiming.FSMC_CLKDivision = 0;
readWriteTiming.FSMC_DataLatency = 0;
readWriteTiming.FSMC_AccessMode = FSMC_AccessMode_A;
FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1;
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Enable;
FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM;
FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &readWriteTiming;
FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &readWriteTiming;
FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
//FSMC Bank1_SRAM1 Bank使能
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE);
}
对应FPGA模块如下
module fsmc(
ab,
db,
wrn,
rdn,
csn,
PLL_100M,
RST_n,
nadv
);
input [8:0]ab;
inout [15:0]db;
input wrn;
input rdn;
input csn;
input PLL_100M;
input RST_n;
input nadv;
wire rd;
wire wr;
assign rd = (csn | rdn);
assign wr = (csn | wrn);
wire [15:0]DB_OUT;
assign db = !rd ? DB_OUT : 16'hzzzz;
reg wr_clk1,wr_clk2;
always @(posedge PLL_100M or negedge RST_n)
begin
if(!RST_n)
begin
wr_clk1 <= 1'd1;
wr_clk2 <= 1'd1;
end
else
{wr_clk2,wr_clk1} <= {wr_clk1,wr}; //提取写时钟
end
reg rd_clk;
always @(posedge PLL_100M or negedge RST_n)
begin
if(!RST_n)
rd_clk <= 1'd1;
else
rd_clk <= rd; //提取读时钟
end
wire clk = (!wr_clk2 | !rd);
my_ram u1( //ram块例化
.address(ab),
.clock(clk),
.data(db),
.wren(!wr),
.rden(!rd),
.q(DB_OUT),
);
endmodule
交互核心代码就一句话，但是需要注意的是在《STM32F4XX中文参考手册》中有说
因为使用的是16位数据宽度，总线内部会自动右移一位，所以我们多左移一位
#define FPGA_OFFSET_ADDR(reg) *((volatile unsigned short int *)(0x60000000 + ((reg) << 17)))
这句代码中的reg参数是与FPGA约定的寄存器地址，我们的数据是16位的，使用方法如下：文章来源：https://www.toymoban.com/news/detail-689336.html
uint16_t id;
id = FPGA_OFFSET_ADDR(5); //从寄存器5读出数据放到变量id里面
FPGA_OFFSET_ADDR(6) = 0xAF14; //往寄存器6里面写入数据0xAF14
参考代码文章来源地址https://www.toymoban.com/news/detail-689336.html
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