spi clock

author: gooogleman@foxmail.com // sort out a good technical document later, now, you need to reserve your first account. { . CLK ={ . name = "sclk_fimd", . ID =-1, . enable = s5pv210_clk_ip1_ctrl, . ctrlbit = (1 }, . sources = clkset_group2, // # define s5p_clk_src1 s5p_clkreg (0x204) // # define s5p_clk_div1 s5p_clkreg (0x304) . reg_src = {. reg = s5p_clk_src1 ,. shift = 20 ,. size = 4 }, . Reg_div = {. Reg = s5p_clk_div1,. Shift = 20,. size = 4 }, /*

requires downgrading. Therefore, the fclk frequency is reduced to pclk and hclk by the divider. How can we reduce the workload? You can use the clkdivn Sub-division control register to control the sub-division.For example, when clkdivn is assigned 0x5, that is, fclk: hclk: pclk = 400 MHz: 100 MHz: 50 MHz.There are two peripheral clock types for S3C2440: pclk and hclk.Peripherals using pclk include: wdt, IIS, I2C, PWM timer, MMC interface, ADC, UART,

S3C2410 has three clock flck, hclk, and pclk (these three are the core hour hands) The S3C2410 chip has such a paragraph: Fclk is used by ARM920T, kernel clock, clock speed. Hclk is used for AHB Bus, which is used by the ARM920T, the memory controller, the interrupt controller, the LCD controller, the DMA and USB Host block. that is, it provides

S3C2440 clock C code about clock in ads1.2:Changempllvalue (mpll_val> 12) 0xff, (mpll_val> 4) 0x3f, mpll_val 3 ); Changeclockdivider (Key, 12 ); 1) Relationship between flck, hclk and pclkThe S3C2440 has three clock types: flck, hclk, and pclk. According to the S3C2440 official manual: fclk is used by ARM920T,Hclk is used for AHB Bus, which is used by the ARM

Tags: assignment suspend use ROC equals create principle Register oneFirst, prefaceClock is the basis of a timer, and any timer needs to work on a given clock. The kernel maintains a number of clock, the second chapter of this article describes the basic concept of clock and some statically defined POSIX clock. Accordi

, MMC interface, ADC, UART, gpio, RTC, and SPI. These three system clocks (fclk, hclk, and pclk) have a proportional relationship, which is controlled by the hdivn bit and pdivn bit in the clkdivn register, therefore, as long as we know the fclk, and then through the control of the two, we can determine the hclk and pclk. How does fclk get it? It is obtained by inputting the frequency of the clock (that is,

I. Clock 1. Three different clock sources can be used to drive the system clock (sysclk ): . HSI oscillator clock high speed internal . HSE oscillator clock high speed external . PLL Clock Phase Locked Loop 2. These devices have t

Recently, for Linux development on arm, C Programs Written in windows need to be transplanted to Linux. The underlying SPI driver implementation and socket communication on the upper layer need to be rewritten, the application also needs to be changed. It does not take much effort to make the program run smoothly throughout the process. Thanks to the powerful eclipse + arm-Linux-GCC combination, however, many interesting problems are found during debu

Original Address http://www.dzsc.com/data/html/2011-1-17/88338.html1 IntroductionIn distributed systems, a global time is often needed to determine the sequence of events in the system, to coordinate the transmission of various messages, and to control and monitor the state of the system. It is necessary to unify the local time of each part in the system and clock synchronization. With the widespread application of distributed simulation system and te

1. Clock resource Overview The clock facility provides a series of low-capacitance, low-jitter Interconnect Lines that are ideal for transmitting high-frequency signals and minimizing clock jitter. These connection resources can be connected to DCM, PLL, and so on. Each Spartan-6 Chip provides 16 high-speed, low-jitter global

In the previous section of the discussion, we have been based on the assumption that the clock events in Linux are provided by a cycle clock, regardless of whether the clock_event_device in the system is working in a cycle-triggered mode or in a single-trigger mode, regardless of whether the timer system is operating in a low-resolution mode, or high-precision mode, the kernel does its best to provide cycle

First, s3c2440 clock introductionThere are three kinds of clocks in s3c2440: FCLK,HCLK,PCLK.FCLK for CPU cores, HCLK for Devices on AHB (Advanced high performance bus) buses, such as CPU cores, memory controllers, interrupt controllers, LCD controllers, DMA and USB host modules, etc. PCLK is used for devices on the APB (Advanced peripheral bus) buses such as Watchdog, IIS, I²c, PWM timers, MMC interfaces, ADCs, UART, GPIO, RTC, and

1. Clock source Three different clock sources can do the system clock (SYSCLK):HSI oscillator Clock: high-speed internal clockHSE oscillator Clock: high-speed external clockPLL ClockTwo x two-level clocksLSI (Low speed internal