I have just discovered ChibiOS and I begin to test it with my Nucleo boards (F103RB & F401RE).
Very cool indeed ! Congratulation Giovanni. Great and elegant. The concept is very interesting.
Thanks a lot for sharing.
I have tested Serial, PWM, Events, Shell and ADC with success.
ADC is a little tedious to configure for beginners.
If it can help, here is a little example from the good software of Mathias & Resset here:
https://github.com/resset/STM32F4-Disco ... ample-code
Code: Select all
/**
*
* @file ChibiOS_3/myprogsNucleoF401RE/ADC2/main.c
*
* @brief buttonUser on => ADC (single) conversion on PC5 pin (send on serial terminal via USB)
* @details error at compilation with chprintf.h. It was not in ../os/hal/include
* and no more in ../os/various. Copy it from /os/hal/lib/streams and add to Makefile:
* $(CHIBIOS)/os/hal/lib/streams/chprintf.c (line 105)
*
* In order to use the PAL driver the HAL_USE_PAL option must be enabled in halconf.h.
* You must enable too, the ADC subsystem in halconf.h
*
* In mcuconf.h, set:
* STM32_ADC_USE_ADC1 TRUE
* STM32_SERIAL_USE_USART2 TRUE
*/
#include "ch.h"
#include "hal.h"
#include "chprintf.h"
/*
* Defines for single scan conversion
*/
#define ADC_GRP1_NUM_CHANNELS 1
#define ADC_GRP1_BUF_DEPTH 2048*2*4
/*
* Buffer for single conversion
*/
static adcsample_t samples1[ADC_GRP1_NUM_CHANNELS * ADC_GRP1_BUF_DEPTH];
/*
* ADC conversion group.
* Mode: Linear buffer, 8 samples of 1 channel, SW triggered.
* Channels: IN15 = PC5 = Morpho Nucleo CN10-pin 6.
*/
static const ADCConversionGroup adcgrpcfg1 = {
FALSE, // circular buffer mode
ADC_GRP1_NUM_CHANNELS, // Number of the analog channels
NULL, // Callback function (not needed here)
NULL, // Error callback
0, // CR1
ADC_CR2_SWSTART, // CR2
ADC_SMPR1_SMP_AN15(ADC_SAMPLE_3), // sample times ch10-18
0, // sample times ch0-9
ADC_SQR1_NUM_CH(ADC_GRP1_NUM_CHANNELS),// SQR1: Conversion group sequence 13...16 + sequence length
0, // SQR2: Conversion group sequence 7...12
ADC_SQR3_SQ1_N(ADC_CHANNEL_IN15) // SQR3: Conversion group sequence 1...6
};
int main(void) {
halInit();
chSysInit();
/*
* ADC init
*/
palSetPadMode(GPIOC, GPIOC_PIN5, PAL_MODE_INPUT_ANALOG);
adcStart(&ADCD1, NULL);
/*
* Activates the serial driver 2 using the driver default configuration:
* 38400 bauds, 8bits, 1 stop-bit, no parity
*/
sdStart(&SD2, NULL);
/*
* Normal main() thread activity, in this demo it does nothing except
* sleeping in a loop and check the button state.
*/
while (TRUE)
{
if (!palReadPad(GPIOC, GPIOC_BUTTON)){ // user button pushed
/*
* single analog conversion
* converts ADC_GRP1_BUF_DEPTH samples and averages them
* with ADC_GRP1_BUF_DEPTH==2048 this gives around 14 bit precision
* even though the ADC hardware has only 12 bits internal precision
* also at 2048 samples the 14 bit are nearly noise free, while
* each sample is very noisy.
* WARNING: If you average to many samples, the variable containing
* the sum may overflow. That means that your readings will be wrong.
* However: With the ADC delivering a max value of 2^12, with uint32_t
* you can average 2^20 = 1048576 samples.
*/
uint32_t sum=0;
unsigned int i;
adcConvert(&ADCD1, &adcgrpcfg1, samples1, ADC_GRP1_BUF_DEPTH);
//prints the first measured value
chprintf((BaseSequentialStream *)&SD2, "Measured: %d ", samples1[0]*16);
sum=0;
for (i=0;i<ADC_GRP1_BUF_DEPTH;i++){
sum += samples1[i];
}
//prints the averaged value with two digits precision
chprintf((BaseSequentialStream *)&SD2, "%U\r\n", sum/(ADC_GRP1_BUF_DEPTH/16));
}
chThdSleepMilliseconds(500);
}
} 
