Uses timer to set interval between ADC single conversions that are then sent as stream messages to host. More...

#include "asc_exception.h"
#include "asc_helpers.h"
#include "ascii_serial_com.h"
#include "ascii_serial_com_device.h"
#include "ascii_serial_com_register_pointers.h"
#include "avr/avr_uart.h"
#include "circular_buffer.h"
#include "millisec_timer.h"
#include <avr/interrupt.h>
#include <avr/io.h>
#include <util/atomic.h>

Include dependency graph for arduino_uno_adc_streaming.c:

Go to the source code of this file.

Macros
#define	F_CPU 16000000L

#define	BAUD 9600

#define	MYUBRR (F_CPU / 16 / BAUD - 1)

#define	UART_NO 0

#define	have_finished_ADC_conversion (!(ADCSRA & (1 << ADSC)))

#define	nRegs 10

Functions
	DECLARE_ASC_DEVICE_W_REGISTER_POINTERS () CEXCEPTION_T e

int	main (void)

	def_usart_isr_push_rx_to_circ_buf (USART_RX_vect, UDR0, &extraInputBuffer) MILLISEC_TIMER_AVR_TIMER0_ISR

Variables
bool	have_started_ADC_conversion = false

millisec_timer	adc_timer

uint32_t	adc_sample_period_ms = 1000

volatile REGTYPE *	register_map [nRegs]
	Register Map.

REGTYPE	register_write_masks [nRegs]
	Write masks for register_map.

uint16_t	nExceptions

Detailed Description

Uses timer to set interval between ADC single conversions that are then sent as stream messages to host.

On receiving 'n' message, begins streaming ADC values to host (by default the ADC is connected to ground) Stops when 'f' message is received.

ADC channel selection and time between ADC conversions are configurable with registers.

You can also turn on and off the user LED with register 0, bit 5

Register map is documented at register_map

Definition in file arduino_uno_adc_streaming.c.

Macro Definition Documentation

◆ BAUD

#define BAUD 9600

Definition at line 32 of file arduino_uno_adc_streaming.c.

◆ F_CPU

#define F_CPU 16000000L

Definition at line 31 of file arduino_uno_adc_streaming.c.

◆ have_finished_ADC_conversion

#define have_finished_ADC_conversion (!(ADCSRA & (1 << ADSC)))

Definition at line 37 of file arduino_uno_adc_streaming.c.

◆ MYUBRR

#define MYUBRR (F_CPU / 16 / BAUD - 1)

Definition at line 33 of file arduino_uno_adc_streaming.c.

◆ nRegs

#define nRegs 10

Definition at line 42 of file arduino_uno_adc_streaming.c.

◆ UART_NO

#define UART_NO 0

Definition at line 34 of file arduino_uno_adc_streaming.c.

Function Documentation

◆ DECLARE_ASC_DEVICE_W_REGISTER_POINTERS()

DECLARE_ASC_DEVICE_W_REGISTER_POINTERS ( )

Definition at line 155 of file stm32f091nucleo64_adc_streaming.c.

◆ main()

int main ( void )

Definition at line 108 of file arduino_uno_adc_streaming.c.

Variable Documentation

◆ adc_sample_period_ms

uint32_t adc_sample_period_ms = 1000

Definition at line 40 of file arduino_uno_adc_streaming.c.

◆ adc_timer

millisec_timer adc_timer

Definition at line 39 of file arduino_uno_adc_streaming.c.

◆ have_started_ADC_conversion

bool have_started_ADC_conversion = false

Definition at line 36 of file arduino_uno_adc_streaming.c.

◆ nExceptions

uint16_t nExceptions

Definition at line 107 of file arduino_uno_adc_streaming.c.

◆ register_map

volatile REGTYPE* register_map[nRegs]

Initial value:

= {
    &PORTB,
    &ADMUX,
    &((uint8_t *)(&adc_sample_period_ms))[0],
    &((uint8_t *)(&adc_sample_period_ms))[1],
    &((uint8_t *)(&adc_sample_period_ms))[2],
    &((uint8_t *)(&adc_sample_period_ms))[3],
    &((uint8_t *)(&MILLISEC_TIMER_NOW))[0],
    &((uint8_t *)(&MILLISEC_TIMER_NOW))[1],
    &((uint8_t *)(&MILLISEC_TIMER_NOW))[2],
    &((uint8_t *)(&MILLISEC_TIMER_NOW))[3],
}

Register Map.

Lower byte of the 16 bit variables is in lower register number

Register Number	Description	r/w	Default
0	PORTB, bit 5 is LED	r, bit 5 is w	0
1	ADMUX	r, lower 4 bits w	0x4F (ground)
2	adc_sample_period_ms lowest 8 bits	r/w	0xe8 (1000)
3	adc_sample_period_ms bits 8-15	r/w	0x03
4	adc_sample_period_ms bits 16-23	r/w	0
5	adc_sample_period_ms bits 24-21	r/w	0
6	MILLISEC_TIMER_NOW lowest 8 bits	r	counting
7	MILLISEC_TIMER_NOW bits 8-15	r	counting
8	MILLISEC_TIMER_NOW bits 16-23	r	counting
9	MILLISEC_TIMER_NOW bits 24-21	r	counting

ADMUX: the upper half of the register is the read only ADC reference selection. The bottom 4 bits are r/w and are the channel selection. values of 0-7 select the ADC channel to read from and 0xF is GND. Don't write any values besides 0-7 and 0xF, as it could cause issues.

adc_sample_period_ms: the time between ADC conversion in milliseconds. default: 1000 ms = 1 s

See also: register_write_masks

Definition at line 72 of file arduino_uno_adc_streaming.c.

◆ register_write_masks

REGTYPE register_write_masks[nRegs]