I'm attempting to build a project to use easyDMA with PWM, but as there are no applicable examples in SDK 15, I am working on it myself. I originally asked for help here: https://devzone.nordicsemi.com/f/nordic-q-a/33473/using-sdk-15-0-and-pca10040-would-like-to-create-a-repeating-sawtooth-waveform-using-pwm-and-easydma
but didn't get any responses so I am converting a code example that I referenced in my previous post to be compatible with SDK 15.
I've currently got one build error caused by NRFX_PWM0_INST_IDX being undefined.
It's used in line 78 of nrfx_pwm.h (see line 21 below)
/**
* @brief PWM driver instance data structure.
*/
typedef struct
{
NRF_PWM_Type * p_registers; ///< Pointer to the structure with PWM peripheral instance registers.
uint8_t drv_inst_idx; ///< Driver instance index.
} nrfx_pwm_t;
/**
* @brief Macro for creating a PWM driver instance.
*/
#define NRFX_PWM_INSTANCE(id) \
{ \
.p_registers = NRFX_CONCAT_2(NRF_PWM, id), \
.drv_inst_idx = NRFX_CONCAT_3(NRFX_PWM, id, _INST_IDX), \
}
enum {
#if NRFX_CHECK(NRFX_PWM0_ENABLED)
NRFX_PWM0_INST_IDX,
#endif
#if NRFX_CHECK(NRFX_PWM1_ENABLED)
NRFX_PWM1_INST_IDX,
#endif
#if NRFX_CHECK(NRFX_PWM2_ENABLED)
NRFX_PWM2_INST_IDX,
#endif
#if NRFX_CHECK(NRFX_PWM3_ENABLED)
NRFX_PWM3_INST_IDX,
#endif
NRFX_PWM_ENABLED_COUNT
};
I don't think I'm missing any include files, does anyone have some hints? You won't find anything mentioning this value anywhere!
Here is my current code, which is an example I found which I converted to be compatible with SDK 15:
// for PWM
#include <stdio.h>
#include "nrfx_pwm.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "boards.h"
#include "bsp.h"
#include "app_timer.h"
#include "nrf_drv_clock.h"
#include "nrf_delay.h"
// other items for PWM
#define OUTPUT_PIN 26
#define DUTY_A 50
#define DUTY_B 80
#define NRFX_PWM0_INST_IDX 0 // <<-- just added this as it was undefined
static nrfx_pwm_t m_pwm0 = NRFX_PWM_INSTANCE(0);
static nrf_pwm_values_common_t /*const*/ seq0_values[] =
{
DUTY_A,DUTY_A,DUTY_A
};
nrf_pwm_sequence_t const seq0 =
{
.values.p_common = seq0_values,
.length = NRF_PWM_VALUES_LENGTH(seq0_values),
.repeats = 0,
.end_delay = 0
};
static nrf_pwm_values_common_t /*const*/ seq1_values[] =
{
DUTY_B,DUTY_B,DUTY_B,DUTY_B,DUTY_B,DUTY_B,DUTY_B
};
nrf_pwm_sequence_t const seq1 =
{
.values.p_common = seq1_values,
.length = NRF_PWM_VALUES_LENGTH(seq1_values),
.repeats = 36,
.end_delay = 0
};
static void pwm_init(void)
{
nrfx_pwm_config_t const config0 =
{
.output_pins =
{
OUTPUT_PIN, // channel 0
NRFX_PWM_PIN_NOT_USED, // channel 1
NRFX_PWM_PIN_NOT_USED, // channel 2
NRFX_PWM_PIN_NOT_USED, // channel 3
},
.irq_priority = APP_IRQ_PRIORITY_LOWEST,
.base_clock = NRF_PWM_CLK_1MHz,
.count_mode = NRF_PWM_MODE_UP,
.top_value = 100,
.load_mode = NRF_PWM_LOAD_COMMON,
.step_mode = NRF_PWM_STEP_AUTO
};
// Init PWM without error handler
APP_ERROR_CHECK(nrfx_pwm_init(&m_pwm0, &config0, NULL));
}
// end PWM
// and here is main()
/**@brief Function for application main entry.
*/
int main(void)
{
bool erase_bonds;
// Initialize modules.
log_init();
clock_init();
#ifdef TRC_USE_TRACEALYZER_RECORDER
#if (TRC_CFG_RECORDER_MODE == TRC_RECORDER_MODE_STREAMING)
vTraceEnable(TRC_INIT);
#else
vTraceEnable(TRC_START);
#endif
#endif
// Do not start any interrupt that uses system functions before system initialisation.
// The best solution is to start the OS before any other initalisation.
#if NRF_LOG_ENABLED
// Start execution.
if (pdPASS != xTaskCreate(logger_thread, "LOGGER", 256, NULL, 1, &m_logger_thread))
{
APP_ERROR_HANDLER(NRF_ERROR_NO_MEM);
}
#endif
// Activate deep sleep mode.
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
// Configure and initialize the BLE stack.
ble_stack_init();
// Initialize modules.
timers_init();
buttons_leds_init(&erase_bonds);
gap_params_init();
gatt_init();
advertising_init();
services_init();
sensor_simulator_init();
conn_params_init();
peer_manager_init();
application_timers_start();
BattChn=xTraceRegisterString("Battery Level");
RateChn=xTraceRegisterString("Heart Rate");
// PWM
// Start clock for accurate frequencies
NRF_CLOCK->TASKS_HFCLKSTART = 1;
// Wait for clock to start
while(NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
pwm_init();
APP_ERROR_CHECK(nrfx_pwm_complex_playback(&m_pwm0, &seq0, &seq1, 1,
NRFX_PWM_FLAG_LOOP ));
// end PWM
// Create a FreeRTOS task for the BLE stack.
// The task will run advertising_start() before entering its loop.
nrf_sdh_freertos_init(advertising_start, &erase_bonds);
NRF_LOG_INFO("HRS FreeRTOS example started.");
// Start FreeRTOS scheduler.
vTaskStartScheduler();
for (;;)
{
APP_ERROR_HANDLER(NRF_ERROR_FORBIDDEN);
}
}
Currently, the linker is giving these two errors:
Any ideas?
