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Add support for STM32 Potentiometer via ADC3

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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4252 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo
2012-01-02 18:22:19 +00:00
parent 3d3bc75c12
commit 4f07eda719
10 changed files with 244 additions and 58 deletions
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nuttx/configs/stm3210e-eval/src/up_adc.c
+49 -30
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@@ -2,7 +2,7 @@
* configs/stm3210e-eval/src/up_adc.c
* arch/arm/src/board/up_adc.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -73,10 +73,13 @@
#endif
#if defined(CONFIG_STM32_ADC1) || defined(CONFIG_STM32_ADC2) || defined(CONFIG_STM32_ADC3)
#ifndef CONFIG_STM32_ADC1
# warning "Channel information only available for ADC1"
#endif
/* The number of ADC channels in the conversion list */
#define ADC_NCHANNELS 1
#define ADC1_NCHANNELS 1
/************************************************************************************
* Private Data
@@ -84,11 +87,13 @@
/* Identifying number of each ADC channel: Variable Resistor */
static const uint8_t g_chanlist[ADC_NCHANNELS] = {14};
#ifdef CONFIG_STM32_ADC1
static const uint8_t g_chanlist[ADC1_NCHANNELS] = {14};
/* Configurations of pins used byte each ADC channels */
static const uint32_t g_pinlist[ADC_NCHANNELS] = {GPIO_ADC1_IN14};
static const uint32_t g_pinlist[ADC1_NCHANNELS] = {GPIO_ADC1_IN14};
#endif
/************************************************************************************
* Private Functions
@@ -99,47 +104,61 @@ static const uint32_t g_pinlist[ADC_NCHANNELS] = {GPIO_ADC1_IN14};
************************************************************************************/
/************************************************************************************
* Name: stm32_boardinitialize
* Name: adc_devinit
*
* Description:
* All STM32 architectures must provide the following entry point. This entry point
* is called early in the intitialization -- after all memory has been configured
* and mapped but before any devices have been initialized.
* All STM32 architectures must provide the following interface to work with
* examples/adc.
*
************************************************************************************/
int adc_devinit(void)
{
#ifdef CONFIG_STM32_ADC1
static bool initialized = false;
struct adc_dev_s *adc;
int ret;
int i;
/* Configure the pins as analog inputs for the selected channels */
/* Check if we have already initialized */
for(i = 0; i < ADC_NCHANNELS; i++)
if (!initialized)
{
stm32_configgpio(g_pinlist[i]);
/* Configure the pins as analog inputs for the selected channels */
for (i = 0; i < ADC1_NCHANNELS; i++)
{
stm32_configgpio(g_pinlist[i]);
}
/* Call stm32_adcinitialize() to get an instance of the ADC interface */
adc = stm32_adcinitialize(1, g_chanlist, ADC1_NCHANNELS);
if (adc == NULL)
{
adbg("ERROR: Failed to get ADC interface\n");
return;
}
/* Register the ADC driver at "/dev/adc0" */
ret = adc_register("/dev/adc0", adc);
if (ret < 0)
{
adbg("adc_register failed: %d\n", ret);
return ret;
}
/* Now we are initialized */
initialized = true;
}
/* Call stm32_adcinitialize() to get an instance of the ADC interface */
adc = stm32_adcinitialize(1, g_chanlist, ADC_NCHANNELS);
if (adc == NULL)
{
adbg("ERROR: Failed to get ADC interface\n");
return;
}
/* Register the ADC driver at "/dev/adc0" */
ret = adc_register("/dev/adc0", adc);
if (ret < 0)
{
adbg("adc_register failed: %d\n", ret);
}
return ret;
return OK;
#else
return -ENOSYS;
#endif
}
#endif /* CONFIG_STM32_ADC || CONFIG_STM32_ADC2 || CONFIG_STM32_ADC3 */
#endif /* CONFIG_STM32_ADC1 || CONFIG_STM32_ADC2 || CONFIG_STM32_ADC3 */
#endif /* CONFIG_ADC */