marcel van de Kamp
program for external ADC ADS8320 Based on the program for the SCP1000. Still figuring out timing issues
Revision 0:918a2b064be6, committed 2011-02-18
- Comitter:
- marcelvandekamp
- Date:
- Fri Feb 18 13:46:46 2011 +0000
- Commit message:
- V3
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ads8320/ads8320.cpp Fri Feb 18 13:46:46 2011 +0000
@@ -0,0 +1,50 @@
+
+
+#include "ads8320.h"
+
+ads8320::ads8320(PinName mosi, PinName miso, PinName sclk, PinName cs)
+ : m_spi(mosi, miso, sclk)
+ , m_cs(cs) {
+ m_cs=1;
+ m_spi.frequency(1000000); // the fastest of the sensor
+ m_spi.format(8, 0); // duda son dos palabras de 8 bits?
+ // wait(0.5);
+ //------------------------------------------------
+ // pc.printf("RESET\r\n");
+ write_register(0x06,0x01);
+ // wait(0.5);
+
+ // pc.printf("Initialize High Resolution Constant Reading Mode\r\n");
+ write_register(0x03,0x0A);
+ //wait(0.5);
+}
+
+
+ unsigned int ads8320::readTemperature() { //was float
+ unsigned int temp_in = read_register16(TEMP);
+ // temp_in /= 20;
+ unsigned int Ti = temp_in;
+ return Ti; //return temp_in;
+}
+
+void ads8320::write_register(char register_name, char register_value) {
+ register_name <<= 2;
+ register_name |= 0x02; //write command
+ m_cs=0; //Select SPI device
+ m_spi.write(register_name); //Send register location
+ m_spi.write(register_value); //Send value to record into register
+ m_cs=1;
+}
+
+unsigned int ads8320::read_register16(char register_name) {
+ register_name <<= 2;
+ register_name &= 0xFC; //Read command
+ m_cs=0; //Select SPI Device
+ m_spi.write(register_name); //Write byte to device
+ unsigned int in_byte1 = m_spi.write(0x00); //(was zonder unsigned)
+ unsigned int in_byte2 = m_spi.write(0x00);
+ m_cs=1;
+ //float in_word= (in_byte1<<=8) | (in_byte2);
+ unsigned int in_word= (in_byte1<<=8) | (in_byte2);
+ return(in_word);
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ads8320/ads8320.h Fri Feb 18 13:46:46 2011 +0000
@@ -0,0 +1,41 @@
+
+
+#ifndef _ads8320_H
+#define _ads8320_H
+
+#include "mbed.h"
+
+class ads8320 {
+ public:
+ /**
+ * Constructor.
+ *
+ * @param mosi SPI MOSI pin
+ * @param miso SPI MISO pin
+ * @param sclk SPI SCLK pin
+ * @param cs Chip select pin
+ */
+ ads8320(PinName mosi, PinName miso, PinName sclk, PinName cs);
+
+ ~ads8320() { /* empty */ };
+
+
+ unsigned long readPressure();
+
+
+
+ unsigned int readTemperature(); //was float
+
+ private:
+
+ static const char TEMP = 0x21; //16 bit temp
+ SPI m_spi;
+ DigitalOut m_cs;
+
+ // char read_register(char register_name);
+ void write_register(char register_name, char register_value);
+ // float read_register16(char register_name);
+ unsigned int read_register16(char register_name);
+};
+
+#endif // _
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Feb 18 13:46:46 2011 +0000
@@ -0,0 +1,68 @@
+#include "mbed.h"
+#include "ads8320.h"
+
+
+# define SAMPLENRS 7000
+# define SAMPLES_SEC 161364
+# define SAMPLERATE 9600
+
+Serial pc(USBTX, USBRX);
+ads8320 adsx8320(p5,p6,p7,p8);
+Serial lcd (p28, p27);
+InterruptIn Potmeter(p23);
+DigitalOut led(LED1);
+
+void clear(void);
+void Measure(void);
+unsigned int samples[SAMPLENRS];
+unsigned int average;
+unsigned int sum;
+Timer t;
+
+int main() {
+ Potmeter.rise(&Measure); //if P5 high, then measure
+ while (1) {
+ led = !led;
+ wait(0.25);
+ pc.printf("say something");
+ }
+}
+
+
+
+void Measure() {
+__disable_irq();
+ unsigned int pause = (SAMPLES_SEC/SAMPLERATE) / SAMPLES_SEC;
+ int c=0;
+ clear();
+ lcd.baud(9600);
+ while (1) {
+
+ t.reset();
+ t.start();
+ /* for (int i=0; i < SAMPLENRS; i++) {
+ samples[i] = adsx8320.readTemperature();
+ sum+= samples[i];
+ wait(0.0001041); //divider 0.0001355
+ }*/
+ pc.printf("waarde is: %u \n\r",adsx8320.readTemperature());
+ t.stop();
+ clear();
+ average = sum/SAMPLENRS;
+ //lcd.printf("gem is %u\n\r", average);
+ //lcd.printf("t: %f \n\r", t.read());
+ sum =0;
+ wait(1);
+ clear();
+ average=0;
+__enable_irq();
+
+ }
+}
+
+void clear(void) {
+ // lcd.putc(0xFE);
+ lcd.putc(0x01);
+ lcd.printf(" \n\r");
+ lcd.printf(" \n\r");
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Feb 18 13:46:46 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912