AVR32音頻比特流DAC驅(qū)動(dòng)例如烷基芐基二甲基銨氯化物

　　AVR32音頻比特流DAC驅(qū)動(dòng)例如烷基芐基二甲基銨氯化物

　　這周在AVR32單片機(jī)烷基芐基二甲基銨氯化物是相當(dāng)適合生成音頻播放。本文將解釋如何執(zhí)行此操作，并包括一個(gè)生成正弦波輸出的示例驅(qū)動(dòng)程序的鏈接。

　　許多嵌入式應(yīng)用程序越來(lái)越多地具有音頻回放功能，無(wú)論是對(duì)用戶輸入的簡(jiǎn)單的音頻反饋還是完全的高速流音頻。通過(guò)使用通用的時(shí)鐘界面，基于ATMEL AVR32單片機(jī)的烷基芐基二甲基銨氯化物能夠支持廣泛的播放頻率。

　　功能描述

　　這是一個(gè)非常簡(jiǎn)單的外圍烷基芐基二甲基銨氯化物及其使用的是簡(jiǎn)單的。它需要從通用時(shí)鐘系統(tǒng)提供的時(shí)鐘信號(hào)，以及對(duì)通道的數(shù)據(jù)輸入。圖1中的框圖給出了模塊的概述。詳細(xì)描述了周圍看到的烷基芐基二甲基銨氯化物裝置的數(shù)據(jù)表。

　　Generic clock

　　The ABDAC uses a generic clock to provide the sample frequency. This generic clock is hard wired inside the device and must be 256 times the sample frequency.

　　The generic clock should be configured and enabled before the ABDAC is enabled. For a description of which generic clock is used， see the clock section in the datasheet for the device. Further configurations of the generic clock are also described in this section.

　　The generic clock output range may be limited by its source clock frequency. It is therefore vital to design in an oscillator which can provide a base frequency that is dividable by the generic clock divider in order to reach the required output sample rate. Table 1 shows examples.