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JN-AN-1229
zigbee document upload 23/7/2019
- 2020-06-21 18:00:02下载
- 积分：1
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【19】DMA PWM WS2812 GPIO输出16组
STM32作为主控芯片，72Mhz，利用DMA+PWM实现驱动WS2812，创建16个并行800kBit / s数据流的想法如下：
使用定时器每1.25us创建一个800kHz的时基和一个DMA请求。
使用2个比较模块在低位时间（350ns）和高位时间（700ns）下创建DMA请求
1.25us DMA请求将GPIO端口的所有位设置为高电平
350ns DMA请求将数据从帧缓冲区传输到GPIO端口。如果该位为0，GPIO引脚将变为低电平，否则将保持高电平。
700ns DMA请求将所有GPIO引脚设置为低电平。
重复步骤1到3，直到发送所有位。
这产生脉冲周期为1.25us，脉冲宽度为350ns或700ns的脉冲流，具体取决于脉冲表示的位值，通过DMA将数据传输到GPIO端口意味着每16个LED每位需要一个字（两个字节）。每个LED 24位，每16个LED 24个字（48个字节）。(The idea to create 16 parallel 800kBit/s data streams is the following:
Use a Timer to create an 800kHz time base and a DMA request every 1.25us.
Use 2 compare modules to create DMA requests at the low bit time (350ns) and the high bit time (700ns)
The 1.25us DMA request sets all bits of the GPIO port high
The 350ns DMA request transfers the data from the frame buffer to the GPIO port. If the bit is a 0, the GPIO pin will go low, otherwise it will stay high.
The 700ns DMA request sets all GPIO pins low.
Repeat steps 1 to 3 until all bits have been transmitted.
This creates a stream of pulses with a pulse period of 1.25us and a pulse width of either 350ns or 700ns depending on the bit value the pulse represents.
Transferring the data via DMA to the GPIO port means that per 16 LEDs one half word (two bytes) is needed per bit. At 24 bits per LED that makes 24 half words (48 bytes) per 16 LEDs.)
- 2020-12-15 10:49:13下载
- 积分：1
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俄罗斯方块
说明： 单片机设计，设计俄罗斯方块，包含主程序、工程文件等，欢迎下载(MCU design, design tetris, including the main program, project files, etc., welcome to download)
- 2019-04-23 10:03:05下载
- 积分：1
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minge7
一个用C语言控制的读写7022，存储数据，485上传数据，向液晶模块显示数据的程序。此程序为测试程序，所有与模块通讯功能都能实现。(A use of C language to read and write control 7022, data storage, 485 From the data, display data to the LCD module procedures. This procedure for testing procedure, all communication functions and modules can achieve.)
- 2008-01-25 16:41:24下载
- 积分：1
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STM32-bit-band-understand
对意法半导体最常用的32位单片机位带操作的理解(STMicroelectronics appreciated that the most commonly used 32-bit microcontroller operation)
- 2017-03-30 09:39:18下载
- 积分：1
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Intelligent-Robot
智能防撞机器人系列实验的源代码，包括定时器，红外检测，按键中断，声音识别，蜂鸣器等(Intelligent Robot Series test source code)
- 2015-07-08 17:29:30下载
- 积分：1
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shubiao
鼠标图案显示，用单片机控制在1602上显示的简单程序设计，主要含有1602液晶的所有函数(The mouse pattern MCU control display simple program designed in 1602, mainly contain all of the 1602 LCD function)
- 2012-12-03 22:28:37下载
- 积分：1
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LKT4200
LKT4200 32位高端加密IC是目前行业最高端性能的防盗版加密芯片，芯片采用32位CPU(获得全球最高安全等级EAL5+的智能卡芯片),10K RAM ,支持ISO7816及UART通信，通讯速率最高可达近1Mbps 用户程序存储区容量最高可达420K字节。在超高安全等级加密的同时，速度大大超越一般8位或16位加密芯片。(LKT4200 32-bit high-end encryption IC is currently the industry s most high-end performance of the anti-piracy encryption chip, chip 32-bit CPU (the world s highest level of security EAL5+ smart card chip), 10K RAM, support the ISO7816 and UART communication, communication speed up nearly 1Mbps User program memory capacity of up to 420K bytes. Encrypted in the ultra-high level of security at the same time, the speed far beyond the general 8-bit or 16-bit encryption chip.)
- 2012-09-26 14:30:09下载
- 积分：1
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mmc环流抑制
mmc基本仿真,用于mmc环流抑制，包含了三相不平衡负序分量的处理(Basic simulation of mmc)
- 2020-08-13 17:08:27下载
- 积分：1
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PID控制PWM风机LCD显示
说明： PID控制pwm风扇，可吹小球，附带激光测距，可通过LCD显示(PID control PWM fan, can blow small ball, with laser ranging, can be displayed by LCD)
- 2021-02-02 23:10:51下载
- 积分：1
