超音波位置認識装置
AD変換をしている(DMA)
Revision 0:a621ce2e8838, committed 2018-07-17
- Comitter:
- k0050288
- Date:
- Tue Jul 17 04:52:19 2018 +0000
- Commit message:
- AD??(DMA)
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ADC.lib Tue Jul 17 04:52:19 2018 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/teams/1529561000/code/ADC/#c5f50c994173
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SD.lib Tue Jul 17 04:52:19 2018 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/teams/1529561000/code/SD/#8023ba647c93
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Jul 17 04:52:19 2018 +0000
@@ -0,0 +1,48 @@
+// F446RE ADC with DMA
+// ADC read shifted to 16 bits, our readn is only 12 bits
+// messy, TODO need ADC channel from pin number
+
+#include "mbed.h"
+#include "adc.h"
+#include "SD.h"
+
+adc gadc;
+SD gSD;
+
+DigitalIn btn(USER_BUTTON); // User button
+PwmOut OSILO_PWM(PC_7);
+Serial pc(USBTX, USBRX); // tx, rx
+
+void user_system_create()
+{
+ gadc.init();
+ gSD.init();
+
+ // PWM出力の初期化処理 <PWM出力開始>
+ OSILO_PWM.period_ms(1); // PWM周波数は1kHz(周期:1ms)
+ OSILO_PWM.write(0.5f); // Duty比:50%
+}
+
+int main()
+{
+ /* init */
+ user_system_create();
+
+ pc.printf("PUSH USER BUTTON\n");
+ while(btn); // Wait user button
+
+ /* Start ADC with DMA */
+ pc.printf("Start ADC\n");
+ gadc.read(gadc.ADCVal, sizeof(gadc.ADCVal));
+
+ for(int i = 0; i < ADC_TIMES; i++) {
+ pc.printf("%d,%d\n",i,gadc.ADCVal[i]);
+ }
+
+ for(int i = 0; i < ADC_TIMES; i++) {
+ gSD.setData(i, gadc.ADCVal[i]);
+ gSD.write();
+ }
+
+ gSD.finish();
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Jul 17 04:52:19 2018 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/a7c7b631e539 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/readme.txt Tue Jul 17 04:52:19 2018 +0000 @@ -0,0 +1,14 @@ +DMAでAD変換をするプログラム + +AD変換した値をSDカードにcsvで保存しています． + +問題点(2018/07/13現在) +adc.cppの74行目 + +hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH; + +DMA_PRIORITY_HIGH を DMA_PRIORITY_VERY_HIGH +にしてしまうとAD変換が行われない問題がある． + +DMA_PRIORITY_VERY_HIGH にすると変換速度が上がると思うけど… +DMA_PRIORITY_HIGH だと1.5MHzの変換速度を達成している． \ No newline at end of file