ARM·Embedded Hardware and Interface Development-EEWORLD

Collect

【Contents of this chapter】

1. Understand the hardware circuit design of the development board

2. Understand typical embedded system circuits

3. Understand the working principles of system clock, GPIN, serial port, etc. under S3C2440

4. Master the ARM interrupt processing mechanism

5. Understand the interrupt processing flow under S3C2440 processor

【Chapter Structure】

【ARM·Embedded Hardware and Interface Development】

[Overview of ARM application system design]

The design of embedded application systems requires a balance and compromise between hardware and software design.

Hardware implementation: high execution speed, concise code, but the circuit complexity is relatively high

Software implementation: can execute complex algorithms, can reduce hardware design area and save costs, but the software is complex and the execution speed is slow

【S3C2440A】

【Architecture】

*Integrated systems for handheld devices or general embedded applications

*32-bit RISC architecture, including high-efficiency and powerful ARM920T processor core

* Enhanced ARM architecture MMU

*Instruction cache, data cache, write buffer

* Cost-effective debugging solution based on JTAG interface

【CPU core】

*Supports both ARM and Thumb processor states

*Supports both big and small byte order

* With 7 operation modes: user mode, FIQ fast interrupt mode, IRQ external interrupt mode, management mode, abnormal termination mode, system mode, undefined mode

* 37 registers, including 31 general registers and 6 program status registers

*Has a common instruction construction method

[The more important on-chip peripheral function models of S3C2440A include]

*External Memory Controller

*LCD interface

*3 UART channels/2 SPI channels

*4 DMA channels

*1 I2C channel/1 I2S channel

*1 SD card/MMC card interface

*2 USB host ports/1 USB device port

*4 PWM timers and one internal timer

*1 watchdog timer

*130 programmable I/O ports/24 external interrupt sources

*Power controller, supports 4 modes: Normal, Slow, Idle and Power-off

*8-channel 10-bit ADC and touch screen interface

* Real-time clock RTC with calendar function

* On-chip clock generator with PLL

(I will need to deepen my understanding in the future)

UART communication, SPI communication, I2C communication

【S3C2440A storage system】

0x0000 0000 -0x3FFF FFFF, 1GB is external addressable space;

0x4800 0000 -0x5FFF FFFF is the register address inside the processor;

The rest of the address space is not used (this is why the address space is theoretically 4GB, but less than 4GB can be accessed)

s3c2440A external lead

27 address lines: ADDR0-ADDR26

8 chip select signals: nGCS0-nGCS7 (each chip select signal corresponds to a Bankx)

(When the chip select signal is selected, the peripherals are controlled by bankx)

【Bank】Introduction

Keywords：ARM Reference address：ARM·Embedded Hardware and Interface Development

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