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oscilloscope.c
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oscilloscope.c
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#include <stdint.h>
#include "../registers/converters/adc1.h"
#include "../registers/memory/dma.h"
#include "../registers/system/pin_manager.h"
#include "../registers/timers/tmr5.h"
#include "../bus/spi/spi_driver.h"
#include "../bus/uart/uart1.h"
#include "../helpers/buffer.h"
#include "../commands.h"
/* Static function prototypes */
static void Capture(void);
static void ResetTrigger(void);
static void SetTimeGap(void);
static void SetCS(uint8_t channel, uint8_t value);
response_t OSCILLOSCOPE_CaptureOne(void) {
SetCHANNELS(0); // Capture one channel.
Capture();
return SUCCESS;
}
response_t OSCILLOSCOPE_CaptureTwo(void) {
SetCHANNELS(1); // Capture two channels.
Capture();
return SUCCESS;
}
response_t OSCILLOSCOPE_CaptureThree(void) {
SetCHANNELS(2); // Capture four channels, but ignore the fourth.
Capture();
return SUCCESS;
}
response_t OSCILLOSCOPE_CaptureFour(void) {
SetCHANNELS(3); // Capture four channels.
Capture();
return SUCCESS;
}
static void Capture(void) {
uint8_t config = UART1_Read();
SetSAMPLES_REQUESTED(UART1_ReadInt());
SetDELAY(UART1_ReadInt()); // Wait DELAY / 8 us between samples.
uint8_t ch0sa = config & 0x0F;
uint8_t ch123sa = config & 0x10;
uint8_t trigger = config & 0x80;
ADC1_SetOperationMode(ADC1_10BIT_SIMULTANEOUS_MODE, ch0sa, ch123sa);
ADC1_ConversionChannelsSet(GetCHANNELS());
if (trigger) ResetTrigger();
else SetTRIGGERED(1);
int i;
for (i = 0; i <= GetCHANNELS(); i++) {
SetBUFFER_IDX(i, &BUFFER[i * GetSAMPLES_REQUESTED()]);
}
SetSAMPLES_CAPTURED(0);
SetBUFFER_IDX(0, &BUFFER[0]);
SetTimeGap();
LED_SetLow();
}
response_t OSCILLOSCOPE_CaptureDMA(void) {
uint8_t config = UART1_Read();
SetSAMPLES_REQUESTED(UART1_ReadInt());
SetDELAY(UART1_ReadInt()); // Wait DELAY / 8 us between samples.
uint8_t ch0sa = config & 0x0F;
uint8_t mode = config & 0x80 ? ADC1_12BIT_DMA_MODE : ADC1_10BIT_DMA_MODE;
SetCHANNELS(0); // Capture one channel.
ADC1_SetOperationMode(mode, ch0sa, 0);
DMA_StartAddressASet(DMA_CHANNEL_0, (uint16_t) &BUFFER[0]);
DMA_PeripheralAddressSet(DMA_CHANNEL_0, (uint16_t) &ADC1BUF0);
DMA_TransferCountSet(DMA_CHANNEL_0, GetSAMPLES_REQUESTED() - 1);
DMA_FlagInterruptClear(DMA_CHANNEL_0);
DMA_InterruptEnable(DMA_CHANNEL_0);
DMA_ChannelEnable(DMA_CHANNEL_0);
SetSAMPLES_CAPTURED(GetSAMPLES_REQUESTED()); // Assume it's all over already.
SetTimeGap();
LED_SetLow();
return SUCCESS;
}
static void ResetTrigger(void) {
SetTRIGGER_WAITING(0);
SetTRIGGER_READY(0);
SetTRIGGERED(0);
}
static void SetTimeGap(void) {
TMR5_Initialize();
TMR5_StopWhenIdle();
TMR5_Period16BitSet(GetDELAY() - 1);
TMR5_SetPrescaler(TMR_PRESCALER_8);
TMR5_InterruptFlagClear();
TMR5_InterruptDisable();
TMR5_Start();
}
response_t OSCILLOSCOPE_GetCaptureStatus(void) {
UART1_Write(GetCONVERSION_DONE());
UART1_WriteInt(GetSAMPLES_CAPTURED());
return SUCCESS;
}
response_t OSCILLOSCOPE_ConfigureTrigger(void) {
uint8_t config = UART1_Read();
SetTRIGGER_CHANNEL(config & 0x03);
SetTRIGGER_PRESCALER(config >> 4);
SetTRIGGER_LEVEL(UART1_ReadInt());
return SUCCESS;
}
response_t OSCILLOSCOPE_SetPGAGain(void) {
uint8_t channel = UART1_Read();
uint8_t gain = UART1_Read();
uint16_t write_register = 0x4000;
uint16_t cmd = write_register | gain;
SPI_DRIVER_Close();
SPI_DRIVER_Open(PGA_CONFIG);
SetCS(channel, 0);
SPI_DRIVER_ExchangeWord(cmd);
SetCS(channel, 1);
SPI_DRIVER_Close();
LED_SetHigh();
return SUCCESS;
}
static void SetCS(uint8_t channel, uint8_t value) {
switch(channel) {
case 1:
CS_CH1_Setter = value;
break;
case 2:
CS_CH2_Setter = value;
break;
default:
return;
}
}