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            EEPW首頁(yè) > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > 深入理解ARM體系架構(gòu)(S3C6410)---PWM實(shí)例

            深入理解ARM體系架構(gòu)(S3C6410)---PWM實(shí)例

            作者: 時(shí)間:2016-11-09 來(lái)源:網(wǎng)絡(luò) 收藏
            S3C6410X中有5個(gè)定時(shí)器,這些定時(shí)器產(chǎn)生內(nèi)部中斷。其中,Timer0和Timer1具有PWM功能,而Timer2,3,4沒(méi)有此功能。

            The S3C6410X RISC microprocessorcomprises of five 32-bit timers. These timers are used to generate internal interruptsto the ARM subsystem. In addition, Timers 0 and 1 include a PWM function (PulseWidth Modulation),which can drive an external I/O signal. The PWM for timer 0and 1 have an optional dead-zone generator capability, which can be utilized tosupport a large current device. Timer 2, 3 and 4 are internal timers with no outputpins.

            本文引用地址:http://www.biyoush.com/article/201611/317827.htm

            PWM具有兩種操作模式:自動(dòng)裝載模式,一次觸發(fā)模式。為實(shí)現(xiàn)PWM功能,芯片提供了16個(gè)功能寄存器。這些功能寄存器都連接APB總線

            總體架構(gòu)圖如下:

            S3C6410X中有5個(gè)定時(shí)器,這些定時(shí)器產(chǎn)生內(nèi)部中斷。其中,Timer0和Timer1具有PWM功能,而Timer2,3,4沒(méi)有此功能。定時(shí)器具有雙緩沖特性,這樣就能在不停止當(dāng)前定時(shí)器操作的情況下,為下次定時(shí)器運(yùn)行裝入新的數(shù)值。盡管為定時(shí)器設(shè)置了新數(shù)值,但當(dāng)前的定時(shí)操作能夠成功完成。定時(shí)器從TCNTBn讀取的值是為下次延時(shí)定時(shí)用的,并不影響當(dāng)前定時(shí)器的運(yùn)行。當(dāng)TCNTn減小到0的時(shí)候,TCNTBn的值會(huì)自動(dòng)復(fù)制到TCNTn中,這就是說(shuō)的自動(dòng)裝載操作。定時(shí)器的當(dāng)前技術(shù)數(shù)值可以從定時(shí)計(jì)數(shù)觀察寄存器中TCNTOn讀取。如果TCNTn為0且從裝載也為0的話則TCNTn不在進(jìn)行下次操作。

            寄存器介紹:

            1、總寄存器映射圖

            2、TCFG0寄存器:

            3、TCFG1寄存器:

            4、TCON控制寄存器:

            mini6410蜂鳴器原理圖:

            定義寄存器:


            1. #definerTCFG0(*(volatileunsigned*)(0x7F006000))
            2. #definerTCFG1(*(volatileunsigned*)(0x7F006004))
            3. #definerTCON(*(volatileunsigned*)(0x7F006008))
            4. #definerTCNTB0(*(volatileunsigned*)(0x7F00600C))
            5. #definerTCMPB0(*(volatileunsigned*)(0x7F006010))
            6. #definerTCNTO0(*(volatileunsigned*)(0x7F006014))
            7. #definerTCNTB1(*(volatileunsigned*)(0x7F006018))
            8. #definerTCMPB1(*(volatileunsigned*)(0x7F00601c))
            9. #definerTCNTO1(*(volatileunsigned*)(0x7F006020))
            10. #definerTCNTB2(*(volatileunsigned*)(0x7F006024))
            11. #definerTCNTO2(*(volatileunsigned*)(0x7F00602c))
            12. #definerTCNTB3(*(volatileunsigned*)(0x7F006030))
            13. #definerTCNTO3(*(volatileunsigned*)(0x7F006038))
            14. #definerTCNTB4(*(volatileunsigned*)(0x7F00603c))
            15. #definerTCNTO4(*(volatileunsigned*)(0x7F006040))
            16. #definerTINT_CSTAT(*(volatileunsigned*)(0x7F006044))

            編寫(xiě)初始化函數(shù):


            1. voidinit_pwm()
            2. {
            3. rGPFCON&=~(0x3U<<28);
            4. rGPFCON|=(0x2U<<28);
            5. rTCFG0&=~0xff;
            6. rTCFG0|=(50-1);
            7. rTCFG1=0x4;
            8. #definefreq800
            9. rTCNTB0=(133000000/50/16)/freq;
            10. rTCMPB0=rTCNTB0/2;
            11. rTCON&=~0x1f;
            12. rTCON|=0xb;//disabledeadzone,auto-reload,inv-off,updateTCNTB0&TCMPB0,starttimer0
            13. rTCON&=~2;//clearmanualupdatebit
            14. }

            在main函數(shù)中:


            1. init_pwm();
            2. while(1);



            關(guān)鍵詞: ARM體系架構(gòu)S3C6410PW

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