cpu/nrf5x_common: implement periph_timer_query_freqs

cpu/nrf53/Kconfig

@@ -16,6 +16,7 @@ config CPU_FAM_NRF53
     select HAS_PERIPH_GPIO
     select HAS_PERIPH_GPIO_IRQ
     select HAS_PERIPH_TIMER_PERIODIC
+    select HAS_PERIPH_TIMER_QUERY_FREQS
     select HAS_PERIPH_UART_MODECFG
     select HAS_PERIPH_WDT
     select HAS_PERIPH_WDT_CB

cpu/nrf5x_common/Kconfig

@@ -20,6 +20,7 @@ depends on !CPU_FAM_NRF53
     select HAS_PERIPH_HWRNG
     select HAS_PERIPH_TEMPERATURE
     select HAS_PERIPH_TIMER_PERIODIC
+    select HAS_PERIPH_TIMER_QUERY_FREQS
     select HAS_PERIPH_RTT_OVERFLOW
     select HAS_PERIPH_UART_MODECFG
     select HAS_PERIPH_WDT

cpu/nrf5x_common/Makefile.features

@@ -5,6 +5,7 @@ FEATURES_PROVIDED += periph_flashpage_in_address_space
 FEATURES_PROVIDED += periph_flashpage_pagewise
 FEATURES_PROVIDED += periph_gpio periph_gpio_irq
 FEATURES_PROVIDED += periph_timer_periodic
+FEATURES_PROVIDED += periph_timer_query_freqs
 FEATURES_PROVIDED += periph_uart_modecfg
 FEATURES_PROVIDED += periph_wdt periph_wdt_cb
 

cpu/nrf5x_common/include/periph_cpu_common.h

@@ -257,6 +257,16 @@ typedef struct {
  */
 #define PERIPH_TIMER_PROVIDES_SET   1
 
+/**
+ * @brief   Maximum number of channels
+ *
+ * @note    NRF_TIMER1 and NRF_TIMER2 only have 4 hardware channels (and 3 of
+ *          of them are available to the application, as one has to be used
+ *          to implement timer_read()). Use @ref timer_query_channel_numof to
+ *          check the actual number of supported channels for a given timer.
+ */
+#define TIMER_CHANNEL_NUMOF 5
+
 #ifndef DOXYGEN
 /**
  * @brief   Override SPI mode values

cpu/nrf5x_common/periph/timer.c

@@ -45,6 +45,30 @@ static inline NRF_TIMER_Type *dev(tim_t tim)
     return timer_config[tim].dev;
 }
 
+uword_t timer_query_freqs_numof(tim_t dev)
+{
+    assert(dev < TIMER_NUMOF);
+    (void)dev;
+    return 10;
+}
+
+uword_t timer_query_channel_numof(tim_t dev)
+{
+    assert(dev < TIMER_NUMOF);
+    return timer_config[dev].channels;
+}
+
+uint32_t timer_query_freqs(tim_t dev, uword_t index)
+{
+    assert(dev < TIMER_NUMOF);
+    (void)dev;
+    if (index >= 10) {
+        return 0;
+    }
+
+    return F_TIMER >> index;
+}
+
 int timer_init(tim_t tim, uint32_t freq, timer_cb_t cb, void *arg)
 {
     /* make sure the given timer is valid */
@@ -75,7 +99,7 @@ int timer_init(tim_t tim, uint32_t freq, timer_cb_t cb, void *arg)
             dev(tim)->PRESCALER = i;
             break;
         }
-        cando /= 2;
+        cando >>= 1;
     }
     if (i == 10) {
         return -1;

cpu/nrf9160/Kconfig

@@ -17,6 +17,7 @@ config CPU_FAM_NRF9160
     select HAS_PERIPH_GPIO_LL_IRQ
     select HAS_PERIPH_GPIO_LL_IRQ_UNMASK
     select HAS_PERIPH_TIMER_PERIODIC
+    select HAS_PERIPH_TIMER_QUERY_FREQS
     select HAS_PERIPH_UART_MODECFG
     select HAS_PERIPH_SPI_GPIO_MODE
     select HAS_PERIPH_WDT