2094-BMP5-M 因?yàn)閿?shù)碼管屬于低速設(shè)備，其正常的掃描頻率為 500~10KHz，掃描頻率太快，會(huì)導(dǎo)致系統(tǒng)功耗增加，顯示效果變暗。掃描頻率太慢，會(huì)有明顯的閃爍感。本實(shí)驗(yàn)通過調(diào)試觀察，選擇以 1KHz 作為掃描頻率，實(shí)際顯示效果非常好。 因此本實(shí)驗(yàn)首先就需要產(chǎn)生一個(gè) 1KHz 的掃描時(shí)鐘，該時(shí)鐘由系統(tǒng)時(shí)鐘分頻得到。產(chǎn)生 1KHz 掃描時(shí)鐘的代碼如下：
其中，定義了一個(gè)全局參數(shù) system_clk，該參數(shù)為 Clk 的頻率，不同的時(shí)鐘頻率，只需要更改該參數(shù)，就可改變分頻計(jì)數(shù)器的計(jì)數(shù)值，以保證 1KHz分頻的精準(zhǔn)性。 在驅(qū)動(dòng)中，數(shù)碼管的位選以掃描時(shí)鐘的速率進(jìn)行切換，因?yàn)橹挥?6 位數(shù)碼管，因此當(dāng)位選計(jì)數(shù)到 6-1 后必須清零從頭開始計(jì)數(shù)。相關(guān)代碼如下：
每個(gè)數(shù)碼管需要顯示的內(nèi)容都不相同，由 Data 中相應(yīng)的位，Data中各位與數(shù)碼管的位對(duì)應(yīng)關(guān)系如下：
因此需要從 Data 中將每個(gè)數(shù)碼管被選中時(shí)需要顯示的數(shù)據(jù)提取出來，提取數(shù)據(jù)的代碼如下所示：
因?yàn)樘崛〕鰜淼臄?shù)據(jù)還是 BCD 碼的形式，還需要將 BCD 碼對(duì)應(yīng)的數(shù)據(jù)翻譯成為數(shù)碼管顯示對(duì)應(yīng)字符時(shí)應(yīng)該點(diǎn)亮或熄滅的對(duì)應(yīng)的 LED 的控制信號(hào)，因此必須還有一個(gè) BCD 碼譯碼的過程，該過程代碼如下所示：
控制部分相對(duì)簡(jiǎn)單，只需要根據(jù)對(duì)應(yīng)的 按鍵信息，給待顯示的數(shù)據(jù)加上一個(gè)對(duì)應(yīng)的值
2094-BMP5-M
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Honeywell ABHP Pressure Transducer 9222502 200PSIG USED
New EUCHNER 091493 STP3A-2131A024M Safety Switch
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PowerDAQ PD2-DIO-128I/MT DIO Board Used Spare
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25 NEUTRIK NC3FM-C 3 pole unisex XLR cable connectors
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Fujitsu-Siemens ScenicView B22W-5 22 inch Wide TFT LCD
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SAM ELECTRONICS BLOCK Transformer B 9908133 128VA
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