4 * This file is part of BeRTOS.
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29 * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
33 * \brief ADC hardware-specific definition
35 * \author Daniele Basile <asterix@develer.com>
38 #ifndef DRV_ADC_AT91_H
39 #define DRV_ADC_AT91_H
41 #include <hw/hw_cpufreq.h>
43 #include "cfg/cfg_adc.h"
45 #include <cfg/compiler.h>
50 #define ADC_MUX_MAXCH 8 //Max number of channel for ADC.
51 #define ADC_BITS 10 //Bit resolution for ADC converter.
54 * Macro for computing correct value to write into ADC
57 #define ADC_COMPUTED_PRESCALER (DIV_ROUNDUP(CPU_FREQ, 2 * CONFIG_ADC_CLOCK) - 1)
58 #define ADC_COMPUTED_CLOCK (CPU_FREQ / ((ADC_COMPUTED_PRESCALER + 1) * 2))
59 #define ADC_COMPUTED_STARTUPTIME (((CONFIG_ADC_STARTUP_TIME * ADC_COMPUTED_CLOCK) / 8000000UL) - 1)
60 #define ADC_COMPUTED_SHTIME ((uint32_t)((CONFIG_ADC_SHTIME * (uint64_t)ADC_COMPUTED_CLOCK) / 1000000000UL) - 1)
63 * Init pins macro for adc.
67 * Define PIO controller for enable ADC function.
71 #define ADC_PIO_DISABLE PIOB_PDR
72 #define ADC_PIO_EN_FUNC PIOB_ASR
74 #elif CPU_ARM_SAM7S_LARGE
75 #define ADC_PIO_DISABLE PIOA_PDR
76 #define ADC_PIO_EN_FUNC PIOA_BSR
79 #error No ADC pins name definitions for selected ARM CPU
85 * Implement it if necessary.
87 #define ADC_INIT_PINS() \
91 void adc_hw_select_ch(uint8_t ch);
92 uint16_t adc_hw_read(void);
93 void adc_hw_init(void);
95 #endif /* DRV_ADC_AT91_H */