Ref:TMS320x2833x Analog-to-Digital Converter (ADC) Module

Functions of the ADC module include:

內建取樣與保持電路（S / H），兩組12位元的ADC轉換模組。
類比輸入:0~3V
ADC時鐘快速轉換時間運行在12.5 MHz，或6.25 MSPS
16個多工類比輸入訊號(ADCIN0-ADCIN15)
SEQ(倫循順序)可以作為兩個獨立的8狀態定序器或作為倫循順序來操作或一個大的16倫循順序狀態來操作
輸入模擬電壓的數字值由下式導出
靈活的中斷控制允許每個序列結束（EOS）或每個其他EOS的中斷請求
ePWM觸發器可以在雙音序器模式下獨立運行
作為轉換開始（SOC）序列的源的多個觸發器
1. 　　軟體觸發(SOC_SEQn位元設定)
2. ePWM 1-6
3. GPIO XINT2

Block Diagram of the ADC Module

ADC Operating Modes

ADC In Cascaded Mode (16個狀態的單一串接自動輪序方塊結構圖)

CONV.xx由4位元來定義輸入接腳，來選擇ADCINXX被輸入取樣保持和緩衝

最高為元選擇ADCINA or ADCINB 0:A 1:B

後三位元選擇ADCINX0-7

Ex:

CONVxx=0101=> ADCINA5
CONVxx=1011=> ADCINB3

雙8狀態的ADC自動輪序方塊結構圖

在此模式下，CONVxx的最高為元失去意義，只有三位元去選擇ADCINA0-7 and ADCINB0-7

在此雙輪序模式中，SEQ1有最高的耶先續，例如SEQ1 and SEQ2同時提出要求，會先執行SEQ1

若處理SEQ1輪序期間，SEQ1 & SEQ2又提出要求，則ADC依然會選擇SEQ1做處理

輪序器運作於8狀態與16狀態的些微差異表

可以注意到只有SEQ1右外接腳的SOC

Example 1-1.Simultaneous Sampling Dual Sequencer Mode Example(同時採樣雙序列器模式示例)

Example initialization:
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0x1; // 設置同步採樣MODE
AdcRegs.ADCMAXCONV.all = 0x0033; // 每個排序器4個轉換(共八個)
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; // Setup conv from ADCINA0 & ADCINB0
AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1; // Setup conv from ADCINA1 & ADCINB1
AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2; // Setup conv from ADCINA2 & ADCINB2
AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3; // Setup conv from ADCINA3 & ADCINB3
AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x4; // Setup conv from ADCINA4 & ADCINB4
AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x5; // Setup conv from ADCINA5 & ADCINB5
AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0x6; // Setup conv from ADCINA6 & ADCINB6
AdcRegs.ADCCHSELSEQ3.bit.CONV11 = 0x7; // Setup conv from ADCINA7 & ADCINB7
If SEQ1 and SEQ2 were both executed, the results would go to the following RESULT registers:
ADCINA0 -> ADCRESULT0
ADCINB0 -> ADCRESULT1
ADCINA1 -> ADCRESULT2
ADCINB1 -> ADCRESULT3
ADCINA2 -> ADCRESULT4
ADCINB2 -> ADCRESULT5
ADCINA3 -> ADCRESULT6
ADCINB3 -> ADCRESULT7
ADCINA4 -> ADCRESULT8
ADCINB4 -> ADCRESULT9
ADCINA5 -> ADCRESULT10
ADCINB5 -> ADCRESULT11
ADCINA6 -> ADCRESULT12
ADCINB6 -> ADCRESULT13
ADCINA7 -> ADCRESULT14
ADCINB7 -> ADCRESULT15

ADC MAXCONV Register(ADCMAXCONV小補充)

BIT定義每個觸發器的轉換次數（二進制+1）

每個排序器從“初始狀態”開始並順序前進
除非軟件提早重置，否則每個都會以“結束狀態”進行換行

ADC Input Channel Select Registers(ADCCHSELSEQn 小補充)

ADC輸入通道選擇排序控制寄存器

Example 1-2. Simultaneous Sampling Cascaded Sequencer Mode Example(級聯排序列同步採樣模式示例)

AdcRegs.ADCTRL3.bit.SMODE_SEL = 0x1; // Setup simultaneous sampling mode  同步採樣模式
AdcRegs.ADCTRL1.bit.SEQ_CASC = 0x1; // Setup cascaded sequencer mode   設置級聯排序器模式
AdcRegs.ADCMAXCONV.all = 0x0007; // 8 double conv's (16 total)         每個排序器8個轉換(共16個)
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; // Setup conv from ADCINA0 & ADCINB0
AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1; // Setup conv from ADCINA1 & ADCINB1
AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2; // Setup conv from ADCINA2 & ADCINB2
AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3; // Setup conv from ADCINA3 & ADCINB3
AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4; // Setup conv from ADCINA4 & ADCINB4
AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5; // Setup conv from ADCINA5 & ADCINB5
AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6; // Setup conv from ADCINA6 & ADCINB6
AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7; // Setup conv from ADCINA7 & ADCINB7
If the cascaded SEQ was executed, the results would go to the following ADCRESULT registers:
ADCINA0 -> ADCRESULT0
ADCINB0 -> ADCRESULT1
ADCINA1 -> ADCRESULT2
ADCINB1 -> ADCRESULT3
ADCINA2 -> ADCRESULT4
ADCINB2 -> ADCRESULT5
ADCINA3 -> ADCRESULT6
ADCINB3 -> ADCRESULT7
ADCINA4 -> ADCRESULT8
ADCINB4 -> ADCRESULT9
ADCINA5 -> ADCRESULT10
ADCINB5 -> ADCRESULT11
ADCINA6 -> ADCRESULT12
ADCINB6 -> ADCRESULT13
ADCINA7 -> ADCRESULT14
ADCINB7 -> ADCRESULT15

Example 1-3. Conversion in Dual-Sequencer Mode Using SEQ1 (使用SEQ1的雙輪序模式之轉換)

假如要用SEQ1做7個輪序轉換(例如在自動輪序期間，通道2、3、2、3、6、7、12需要被轉換)，則ADCMAXCONV.all=0x006 (6+1=7)

同時ADCCHSELSEQn 需要設計為下表的值

```
CONV00 = 2
```
```
CONV01 = 3
```
```
CONV02 = 2
```
```
CONV03 = 3
```
```
CONV04 = 6
```
```
CONV05 = 7
```
```
CONV06 = 12
```

Flow Chart for Uninterrupted Autosequenced Mode(連續自動排序模式程式運作流程圖)

DSP_Analog to Digital Converter