blog:2025-07-23-002
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blog:2025-07-23-002 [2025/07/23 08:59] jethro created |
blog:2025-07-23-002 [2025/07/23 09:03] (current) jethro |
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| ====== Local Backup ====== | ====== Local Backup ====== | ||
| * I2C 協定規範： | * I2C 協定規範： | ||
| - | * {{:qlink:memo_used_photo:20250715:pasted:20250723-085607.png?300}} | + | * {{:qlink:memo_used_photo:20250715:pasted:20250723-085607.png?600}} |
| * 一、時鐘 | * 一、時鐘 | ||
| * 首先第一步是產生fast-mode的400khz的scl速率，假設方波高低電平各佔一半，即1.25us，理論上不滿足規範上scl低週期1.3us，但是絕大多數裝置都支援稍微超過400khz的速率。 | * 首先第一步是產生fast-mode的400khz的scl速率，假設方波高低電平各佔一半，即1.25us，理論上不滿足規範上scl低週期1.3us，但是絕大多數裝置都支援稍微超過400khz的速率。 | ||
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| end | end | ||
| endcase</sxh> | endcase</sxh> | ||
| - | * 每次發送3位元組的數據，addr+reg+data。 cnt_byte是計數3個位元組的cnt_bit是計數每個位元組內的bit位元。藍色是相應位。\\ {{:qlink:memo_used_photo:20250715:pasted:20250723-085822.png?300}} | + | * 每次發送3位元組的數據，addr+reg+data。 cnt_byte是計數3個位元組的cnt_bit是計數每個位元組內的bit位元。藍色是相應位。\\ {{:qlink:memo_used_photo:20250715:pasted:20250723-085822.png?600}} |
| - | * start條件。發送的資料是AA，即10101010，跟計數位元相對應。\\ {{:qlink:memo_used_photo:20250715:pasted:20250723-085840.png?300}} | + | * start條件。發送的資料是AA，即10101010，跟計數位元相對應。\\ {{:qlink:memo_used_photo:20250715:pasted:20250723-085840.png?600}} |
| - | * stop條件。\\ {{:qlink:memo_used_photo:20250715:pasted:20250723-085858.png?300}} | + | * stop條件。\\ {{:qlink:memo_used_photo:20250715:pasted:20250723-085858.png?600}} |
| ===== TAGS ===== | ===== TAGS ===== | ||
| * | * | ||
blog/2025-07-23-002.txt · Last modified: 2025/07/23 09:03 by jethro
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