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29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \brief ADC hardware-specific implementation
35 * This ADC module should be use both whit kernel or none.
36 * If you are using a kernel, the adc drive does not wait the finish of
37 * conversion but use a singal every time a required conversion are
38 * ended. This signal wake up a process that return a result of
39 * conversion. Otherwise, if you not use a kernl, this module wait
40 * whit a loop the finishing of conversion.
43 * \author Daniele Basile <asterix@develer.com>
51 #include "cfg/cfg_adc.h"
52 #include "cfg/cfg_proc.h"
53 #include "cfg/cfg_signal.h"
55 #include <cfg/macros.h>
56 #include <cfg/compiler.h>
57 #include <cfg/debug.h>
59 // Define log settings for cfg/log.h.
60 #define LOG_LEVEL ADC_LOG_LEVEL
61 #define LOG_FORMAT ADC_LOG_FORMAT
65 #include <drv/clock_stm32.h>
66 #include <drv/gpio_stm32.h>
72 #include <cfg/module.h>
74 #include <kern/proc.h>
75 #include <kern/signal.h>
77 #include <drv/irq_cm3.h>
80 #if !CONFIG_KERN_SIGNALS
81 #error Signals must be active to use ADC with kernel
84 /* Signal adc convertion end */
85 #define SIG_ADC_COMPLETE SIG_USER0
87 /* ADC waiting process */
88 static struct Process *adc_process;
92 * Simply signal the adc process that convertion is complete.
94 static DECLARE_ISR(adc_conversion_end_irq)
96 sig_post(adc_process, SIG_ADC_COMPLETE);
98 /* Clear the status bit */
101 static void adc_enable_irq(void)
103 /* Register the IRQ handler */
104 //sysirq_setHandler(ADC_IRQHANDLER, adc_conversion_end_irq);
107 #endif /* CONFIG_KERN */
110 * Select mux channel \a ch.
111 * Generally the stm32 cpu family allow us to program the order
112 * of adc channel that we want to read.
113 * In this driver implementation we put as fist channel to read the
116 void adc_hw_select_ch(uint8_t ch)
118 /* We sample only from one channel */
122 * Start an ADC convertion.
123 * If a kernel is present, preempt until convertion is complete, otherwise
124 * a busy wait on ADC_DRDY bit is done.
126 uint16_t adc_hw_read(void)
129 /* Ensure ADC is not already in use by another process */
130 ASSERT(adc_process == NULL);
131 adc_process = proc_current();
134 /* Start convertion */
135 adc->CR2 |= CR2_EXTTRIG_SWSTRT_SET;
138 /* Ensure IRQs enabled. */
139 IRQ_ASSERT_ENABLED();
140 sig_wait(SIG_ADC_COMPLETE);
142 /* Prevent race condition in case of preemptive kernel */
148 /* Wait in polling until conversion is done */
149 //while (!(adc->SR & BV(SR_EOC)));
151 /* Return the last converted data */
159 void adc_hw_init(void)