1.在sdk_config.h中加入宏
// SAADC_ENABLED - nrf_drv_saadc - SAADC peripheral driver - legacy layer //========================================================== #ifndef SAADC_ENABLED #define SAADC_ENABLED 1 #endif // SAADC_CONFIG_RESOLUTION - Resolution // 8 bit // 10 bit // 12 bit // 14 bit
#ifndef SAADC_CONFIG_RESOLUTION #define SAADC_CONFIG_RESOLUTION 2 #endif
// SAADC_CONFIG_OVERSAMPLE - Sample period // Disabled // 2x // 4x // 8x // 16x // 32x // 64x // 128x // 256x
#ifndef SAADC_CONFIG_OVERSAMPLE #define SAADC_CONFIG_OVERSAMPLE 0 #endif
// SAADC_CONFIG_LP_MODE - Enabling low power mode
#ifndef SAADC_CONFIG_LP_MODE #define SAADC_CONFIG_LP_MODE 0 #endif
// SAADC_CONFIG_IRQ_PRIORITY - Interrupt priority
// Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice // 0 (highest) // 1 // 2 // 3 // 4 // 5 // 6 // 7
#ifndef SAADC_CONFIG_IRQ_PRIORITY #define SAADC_CONFIG_IRQ_PRIORITY 6 #endif
// TIMER_ENABLED - nrf_drv_timer - TIMER periperal driver - legacy layer //========================================================== #ifndef TIMER_ENABLED #define TIMER_ENABLED 1 #endif // TIMER_DEFAULT_CONFIG_FREQUENCY - Timer frequency if in Timer mode // 16 MHz // 8 MHz // 4 MHz // 2 MHz // 1 MHz // 500 kHz // 250 kHz // 125 kHz // 62.5 kHz // 31.25 kHz
#ifndef TIMER_DEFAULT_CONFIG_FREQUENCY #define TIMER_DEFAULT_CONFIG_FREQUENCY 4 #endif
// TIMER_DEFAULT_CONFIG_MODE - Timer mode or operation // Timer // Counter
#ifndef TIMER_DEFAULT_CONFIG_MODE #define TIMER_DEFAULT_CONFIG_MODE 0 #endif
// TIMER_DEFAULT_CONFIG_BIT_WIDTH - Timer counter bit width // 16 bit // 8 bit // 24 bit // 32 bit
#ifndef TIMER_DEFAULT_CONFIG_BIT_WIDTH #define TIMER_DEFAULT_CONFIG_BIT_WIDTH 3 #endif
// TIMER_DEFAULT_CONFIG_IRQ_PRIORITY - Interrupt priority
// Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice // 0 (highest) // 1 // 2 // 3 // 4 // 5 // 6 // 7
#ifndef TIMER_DEFAULT_CONFIG_IRQ_PRIORITY #define TIMER_DEFAULT_CONFIG_IRQ_PRIORITY 6 #endif
#ifndef TIMER0_ENABLED #define TIMER0_ENABLED 1 #endif
// TIMER1_ENABLED - Enable TIMER1 instance
#ifndef TIMER1_ENABLED #define TIMER1_ENABLED 1 #endif
// TIMER2_ENABLED - Enable TIMER2 instance
#ifndef TIMER2_ENABLED #define TIMER2_ENABLED 1 #endif
// TIMER3_ENABLED - Enable TIMER3 instance
#ifndef TIMER3_ENABLED #define TIMER3_ENABLED 0 #endif
// TIMER4_ENABLED - Enable TIMER4 instance
#ifndef TIMER4_ENABLED #define TIMER4_ENABLED 0 #endif
// TIMER_CONFIG_LOG_ENABLED - Enables logging in the module. //========================================================== #ifndef TIMER_CONFIG_LOG_ENABLED #define TIMER_CONFIG_LOG_ENABLED 0 #endif // TIMER_CONFIG_LOG_LEVEL - Default Severity level // Off // Error // Warning // Info // Debug
#ifndef TIMER_CONFIG_LOG_LEVEL #define TIMER_CONFIG_LOG_LEVEL 3 #endif
// TIMER_CONFIG_INFO_COLOR - ANSI escape code prefix. // Default // Black // Red // Green // Yellow // Blue // Magenta // Cyan // White
#ifndef TIMER_CONFIG_INFO_COLOR #define TIMER_CONFIG_INFO_COLOR 0 #endif
// TIMER_CONFIG_DEBUG_COLOR - ANSI escape code prefix. // Default // Black // Red // Green // Yellow // Blue // Magenta // Cyan // White
#ifndef TIMER_CONFIG_DEBUG_COLOR #define TIMER_CONFIG_DEBUG_COLOR 0 #endif 2.导入文件nrfx_saadc.c,nrfx_timer.c到工程中
3.引入头文件
#include "nrf_drv_timer.h" #include "nrf_drv_saadc.h"
4.定义变量及宏
#define SAMPLES_IN_BUFFER 4 volatile uint8_t state = 1;
static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(0); static nrf_saadc_value_t m_buffer_pool[2][SAMPLES_IN_BUFFER]; static nrf_ppi_channel_t m_ppi_channel; static uint32_t m_adc_evt_counter;
5.事件及定时器函数
void timer_handler(nrf_timer_event_t event_type, void * p_context) { ret_code_t err_code; switch(event_type) { case NRF_TIMER_EVENT_COMPARE0: err_code = nrfx_saadc_sample(); APP_ERROR_CHECK(err_code); break; default: break; } }
void saadc_callback(nrf_drv_saadc_evt_t const * p_event) { if (p_event->type == NRF_DRV_SAADC_EVT_DONE) { ret_code_t err_code;
err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER); APP_ERROR_CHECK(err_code);
int i; printf("\nADC event number: %d\n", (int)m_adc_evt_counter); for(int i=0;idata.done.p_buffer[i]); m_adc_evt_counter++; } } 6.初时化 void saadc_init(void) { ret_code_t err_code; nrf_drv_saadc_config_t saadc_config = NRF_DRV_SAADC_DEFAULT_CONFIG; saadc_config.resolution = NRF_SAADC_RESOLUTION_12BIT; err_code = nrf_drv_saadc_init(&saadc_config, saadc_callback); APP_ERROR_CHECK(err_code); nrf_saadc_channel_config_t channel_config_7 = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN7);
err_code = nrf_drv_saadc_channel_init(0, &channel_config_7); APP_ERROR_CHECK(err_code); nrf_saadc_channel_config_t channel_config_6 = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN6);
err_code = nrf_drv_saadc_channel_init(1, &channel_config_6); APP_ERROR_CHECK(err_code); nrf_saadc_channel_config_t channel_config_5 = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN5);
err_code = nrf_drv_saadc_channel_init(2, &channel_config_5); APP_ERROR_CHECK(err_code); nrf_saadc_channel_config_t channel_config_4 = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN4);
err_code = nrf_drv_saadc_channel_init(3, &channel_config_4); APP_ERROR_CHECK(err_code); err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER); APP_ERROR_CHECK(err_code);
// err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER); // APP_ERROR_CHECK(err_code);
}
7.在主函数中的处理
saadc_init(); saadc_sampling_event_init();