fixes and start of ADC. Not really working yet

FreeRTOSConfig.h

@@ -153,7 +153,7 @@ to exclude the API function. */
 #elif defined(GEX_PLAT_F072_DISCOVERY)
     // This is for F072
     #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY   3
-    #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 3
+    #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 1
 
     #define configPRIO_BITS         2
 

framework/resources.h

@@ -38,7 +38,7 @@ void rsc_init_registry(void);
  * @param pin - pin number 0-15
  * @return success
  */
-error_t rsc_claim_pin(Unit *unit, char port_name, uint8_t pin);
+error_t rsc_claim_pin(Unit *unit, char port_name, uint8_t pin) __attribute__((warn_unused_result));
 
 /**
  * Claim a resource by the Resource enum
@@ -47,7 +47,7 @@ error_t rsc_claim_pin(Unit *unit, char port_name, uint8_t pin);
  * @param rsc - resource to claim
  * @return success
  */
-error_t rsc_claim(Unit *unit, Resource rsc);
+error_t rsc_claim(Unit *unit, Resource rsc) __attribute__((warn_unused_result));
 
 /**
  * Claim a range of resources (use for resources of the same type, e.g. USART1-5)
@@ -57,7 +57,7 @@ error_t rsc_claim(Unit *unit, Resource rsc);
  * @param rsc1 - last resource to claim
  * @return success (E_SUCCESS = complete claim)
  */
-error_t rsc_claim_range(Unit *unit, Resource rsc0, Resource rsc1);
+error_t rsc_claim_range(Unit *unit, Resource rsc0, Resource rsc1) __attribute__((warn_unused_result));
 
 /**
  * Claim GPIOs by bitmask and port name, atomically.
@@ -68,7 +68,7 @@ error_t rsc_claim_range(Unit *unit, Resource rsc0, Resource rsc1);
  * @param pins - pins, bitmask
  * @return success (E_SUCCESS = complete claim)
  */
-error_t rsc_claim_gpios(Unit *unit, char port_name, uint16_t pins);
+error_t rsc_claim_gpios(Unit *unit, char port_name, uint16_t pins) __attribute__((warn_unused_result));
 
 /**
  * Release all resources held by a unit, de-init held GPIOs

framework/unit_registry.c

@@ -606,7 +606,7 @@ void ureg_tick_units(void)
     UlistEntry *li = ulist_head;
     while (li != NULL) {
         Unit *const pUnit = &li->unit;
-        if (pUnit->status == E_SUCCESS && pUnit->tick_interval > 0) {
+        if (pUnit && pUnit->data && pUnit->status == E_SUCCESS && pUnit->tick_interval > 0) {
             if (pUnit->_tick_cnt == 0) {
                 if (pUnit->driver->updateTick) {
                     pUnit->driver->updateTick(pUnit);

freertos.c

@@ -146,6 +146,8 @@ void MX_FREERTOS_Init(void) {
   /* USER CODE BEGIN Init */
   stackmon_register("Main", mainTaskStack, sizeof(mainTaskStack));
   stackmon_register("Job+Msg", msgJobQueTaskStack, sizeof(msgJobQueTaskStack));
+  stackmon_register("Idle", xIdleStack, sizeof(xIdleStack));
+  stackmon_register("Timers", xTimersStack, sizeof(xTimersStack));
   /* USER CODE END Init */
 
   /* Create the mutex(es) */

gex.mk

@@ -13,6 +13,7 @@ GEX_SRC_DIR = \
     User/units/1wire \
     User/units/i2c \
     User/units/spi \
+    User/units/adc \
     User/TinyFrame \
     User/CWPack \
     User/tasks

platform/debug_uart.c

@@ -66,7 +66,10 @@ void DebugUart_PreInit(void)
 {
     // configure AF only if platform uses AF numbers
 #if !PLAT_NO_AFNUM
-    hw_configure_gpio_af(DEBUG_USART_PORT, DEBUG_USART_PIN, DEBUG_USART_AF);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
+    (void) hw_configure_gpio_af(DEBUG_USART_PORT, DEBUG_USART_PIN, DEBUG_USART_AF);
+#pragma GCC diagnostic pop
 #endif
 
     hw_periph_clock_enable(DEBUG_USART);

platform/hw_utils.c

@@ -4,6 +4,7 @@
 
 #include "platform.h"
 #include <utils/avrlibc.h>
+#include <math.h>
 #include "hw_utils.h"
 #include "macro.h"
 
@@ -263,16 +264,64 @@ char * pinmask2str(uint16_t pins, char *buffer)
                 if (!first) {
                     b += SPRINTF(b, ", ");
                 }
+
                 if (start == (uint32_t)(i+1)) {
                     b += SPRINTF(b, "%"PRIu32, start);
                 }
-//                else if (start == (uint32_t)(i+2)) {
-//                    // exception for 2-long ranges - don't show as range
-//                    b += SPRINTF(b, "%"PRIu32",%"PRIu32, start, i + 1);
-//                }
                 else {
                     b += SPRINTF(b, "%"PRIu32"-%"PRIu32, start, i + 1);
                 }
+
+                first = false;
+                on = false;
+            }
+        }
+    }
+
+    return buffer;
+}
+
+char * pinmask2str_up(uint16_t pins, char *buffer)
+{
+    char *b = buffer;
+    uint32_t start = 0;
+    bool on = false;
+    bool first = true;
+
+    // shortcut if none are set
+    if (pins == 0) {
+        buffer[0] = 0;
+        return buffer;
+    }
+
+    for (int32_t i = 0; i <= 16; i++) {
+        bool bit;
+
+        if (i == 16) {
+            bit = false;
+        } else {
+            bit = 0 != (pins & 1);
+            pins >>= 1;
+        }
+
+        if (bit) {
+            if (!on) {
+                start = (uint32_t) i;
+                on = true;
+            }
+        } else {
+            if (on) {
+                if (!first) {
+                    b += SPRINTF(b, ", ");
+                }
+
+                if (start == (uint32_t)(i-1)) {
+                    b += SPRINTF(b, "%"PRIu32, start);
+                }
+                else {
+                    b += SPRINTF(b, "%"PRIu32"-%"PRIu32, start, i - 1);
+                }
+
                 first = false;
                 on = false;
             }
@@ -387,6 +436,36 @@ error_t hw_configure_sparse_pins(char port_name, uint16_t mask, GPIO_TypeDef **p
     return E_SUCCESS;
 }
 
+/** Solve a timer/counter's count and prescaller value */
+bool solve_timer(uint32_t base_freq, uint32_t required_freq, bool is16bit,
+                 uint16_t *presc, uint32_t *count, float *real_freq)
+{
+    if (required_freq == 0) return false;
+    const float fPresc = base_freq / required_freq;
+    uint32_t wCount = (uint32_t) lrintf(fPresc);
+
+    const uint32_t ceil = is16bit ? UINT16_MAX : UINT32_MAX;
+
+    uint32_t wPresc = 1;
+    while (wCount > ceil) {
+        wPresc <<= 1;
+        wCount >>= 1;
+    }
+
+    if (wPresc > ceil || count == 0) {
+        return false;
+    }
+
+    *count = wCount;
+    *presc = (uint16_t) wPresc;
+
+    if (wPresc * wCount == 0) return false;
+    *real_freq = (base_freq / (wPresc * wCount));
+
+    return true;
+}
+
+
 void hw_periph_clock_enable(void *periph)
 {
     // GPIOs are enabled by default on start-up

platform/hw_utils.h

@@ -78,6 +78,7 @@ uint16_t parse_pinmask(const char *value, bool *suc);
 
 /**
  * Convert a pin bitmap to the ASCII format understood by str_parse_pinmask()
+ * This is the downto variant (15..0)
  *
  * @param pins - sparse pin map
  * @param buffer - output string buffer
@@ -85,6 +86,16 @@ uint16_t parse_pinmask(const char *value, bool *suc);
  */
 char * pinmask2str(uint16_t pins, char *buffer);
 
+/**
+ * Convert a pin bitmap to the ASCII format understood by str_parse_pinmask()
+ * This is the ascending variant (0..15)
+ *
+ * @param pins - sparse pin map
+ * @param buffer - output string buffer
+ * @return the output buffer
+ */
+char * pinmask2str_up(uint16_t pins, char *buffer);
+
 /**
  * Spread packed port pins using a mask
  *
@@ -126,7 +137,7 @@ void hw_deinit_unit_pins(Unit *unit);
  * @param ll_af - LL alternate function constant
  * @return success
  */
-error_t hw_configure_gpio_af(char port_name, uint8_t pin_num, uint32_t ll_af);
+error_t hw_configure_gpio_af(char port_name, uint8_t pin_num, uint32_t ll_af) __attribute__((warn_unused_result));
 
 /**
  * Configure multiple pins using the bitmap pattern
@@ -140,7 +151,7 @@ error_t hw_configure_gpio_af(char port_name, uint8_t pin_num, uint32_t ll_af);
  */
 error_t hw_configure_sparse_pins(char port_name,
                                  uint16_t mask, GPIO_TypeDef **port_dest,
-                                 uint32_t ll_mode, uint32_t ll_otype);
+                                 uint32_t ll_mode, uint32_t ll_otype) __attribute__((warn_unused_result));
 
 /** Helper struct for defining alternate mappings */
 struct PinAF {
@@ -161,6 +172,22 @@ void hw_periph_clock_enable(void *periph);
  */
 void hw_periph_clock_disable(void *periph);
 
+/**
+ * Solve a timer/counter's count and prescaller value to meet the desired
+ * overflow frequency. The resulting values are the dividing factors;
+ * subtract 1 before writing them into the peripheral registers.
+ *
+ * @param[in] base_freq - the counter's input clock frequency in Hz
+ * @param[in] required_freq - desired overflow frequency
+ * @param[in] is16bit - limit counter to 16 bits (prescaller is always 16-bit)
+ * @param[out] presc - field for storing the computed prescaller value
+ * @param[out] count - field for storing the computed counter value
+ * @param[out] real_freq - field for storing the computed real frequency
+ * @return true on success
+ */
+bool solve_timer(uint32_t base_freq, uint32_t required_freq, bool is16bit,
+                 uint16_t *presc, uint32_t *count, float *real_freq);
+
 // ---------- LL extras ------------
 
 static inline bool LL_DMA_IsActiveFlag_G(uint32_t isr_snapshot, uint8_t channel)

platform/irq_dispatcher.c

@@ -61,6 +61,10 @@ static struct callbacks_ {
     struct cbslot dma2_7;
     struct cbslot dma2_8;
 
+    struct cbslot tim6;
+    struct cbslot tim7;
+    struct cbslot tim15;
+
     // XXX add more callbacks here when needed
 } callbacks;
 
@@ -68,41 +72,62 @@ void irqd_init(void)
 {
     memset(&callbacks, 0, sizeof(callbacks));
 
+    // TODO move the priorities to some define
+
 //    NVIC_EnableIRQ(WWDG_IRQn);                  /*!< Window WatchDog Interrupt                                       */
 //    NVIC_EnableIRQ(PVD_VDDIO2_IRQn);            /*!< PVD & VDDIO2 Interrupt through EXTI Lines 16 and 31             */
 //    NVIC_EnableIRQ(RTC_IRQn);                   /*!< RTC Interrupt through EXTI Lines 17, 19 and 20                  */
 //    NVIC_EnableIRQ(FLASH_IRQn);                 /*!< FLASH global Interrupt                                          */
 //    NVIC_EnableIRQ(RCC_CRS_IRQn);               /*!< RCC & CRS global Interrupt                                      */
+
     NVIC_EnableIRQ(EXTI0_1_IRQn);               /*!< EXTI Line 0 and 1 Interrupt                                     */
     NVIC_EnableIRQ(EXTI2_3_IRQn);               /*!< EXTI Line 2 and 3 Interrupt                                     */
     NVIC_EnableIRQ(EXTI4_15_IRQn);              /*!< EXTI Line 4 to 15 Interrupt                                     */
+    HAL_NVIC_SetPriority(EXTI0_1_IRQn, 2, 0);
+    HAL_NVIC_SetPriority(EXTI2_3_IRQn, 2, 0);
+    HAL_NVIC_SetPriority(EXTI4_15_IRQn, 2, 0);
+
 //    NVIC_EnableIRQ(TSC_IRQn);                   /*!< Touch Sensing Controller Interrupts                             */
+
     NVIC_EnableIRQ(DMA1_Channel1_IRQn);         /*!< DMA1 Channel 1 Interrupt                                        */
     NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);       /*!< DMA1 Channel 2 and Channel 3 Interrupt                          */
     NVIC_EnableIRQ(DMA1_Channel4_5_6_7_IRQn);   /*!< DMA1 Channel 4 to Channel 7 Interrupt                           */
-    HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 3, 0);
+    HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 2, 0);
-    HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 3, 0);
+    HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 2, 0);
-    HAL_NVIC_SetPriority(DMA1_Channel4_5_6_7_IRQn, 3, 0);
+    HAL_NVIC_SetPriority(DMA1_Channel4_5_6_7_IRQn, 2, 0);
+
 //    NVIC_EnableIRQ(ADC1_COMP_IRQn);             /*!< ADC1 and COMP interrupts (ADC interrupt combined with EXTI Lines 21 and 22 */
 //    NVIC_EnableIRQ(TIM1_IRQn);                  /*!< TIM1 global Interrupt                                          */
 //    NVIC_EnableIRQ(TIM2_IRQn);                  /*!< TIM2 global Interrupt                                           */
 //    NVIC_EnableIRQ(TIM3_IRQn);                  /*!< TIM3 global Interrupt                                           */
-//    NVIC_EnableIRQ(TIM6_DAC_IRQn);              /*!< TIM6 global and DAC channel underrun error Interrupt            */
+
-//    NVIC_EnableIRQ(TIM7_IRQn);                  /*!< TIM7 global Interrupt                                           */
+    NVIC_EnableIRQ(TIM6_DAC_IRQn);              /*!< TIM6 global and DAC channel underrun error Interrupt            */
-//  --used internally--  NVIC_EnableIRQ(TIM14_IRQn);                 /*!< TIM14 global Interrupt                                          */
+    HAL_NVIC_SetPriority(TIM7_IRQn, 2, 0); // Used for DAC timing
-//    NVIC_EnableIRQ(TIM15_IRQn);                 /*!< TIM15 global Interrupt                                          */
+
+    NVIC_EnableIRQ(TIM7_IRQn);                  /*!< TIM7 global Interrupt                                           */
+    HAL_NVIC_SetPriority(TIM7_IRQn, 2, 0);
+
+    /* Tim14 is used for HAL timebase, because SysTick is used to time FreeRTOS and has the lowest priority. */
+    /* Tim14's priority is set to 0 in the init routine, which runs early in the startup sequence */
+    //  NVIC_EnableIRQ(TIM14_IRQn); /*!< TIM14 global Interrupt */
+
+    NVIC_EnableIRQ(TIM15_IRQn);                 /*!< TIM15 global Interrupt                                          */
+    HAL_NVIC_SetPriority(TIM15_IRQn, 2, 0);
+
 //    NVIC_EnableIRQ(TIM16_IRQn);                 /*!< TIM16 global Interrupt                                          */
 //    NVIC_EnableIRQ(TIM17_IRQn);                 /*!< TIM17 global Interrupt                                          */
 //    NVIC_EnableIRQ(I2C1_IRQn);                  /*!< I2C1 Event Interrupt & EXTI Line23 Interrupt (I2C1 wakeup)      */
 //    NVIC_EnableIRQ(I2C2_IRQn);                  /*!< I2C2 Event Interrupt                                            */
 //    NVIC_EnableIRQ(SPI1_IRQn);                  /*!< SPI1 global Interrupt                                           */
 //    NVIC_EnableIRQ(SPI2_IRQn);                  /*!< SPI2 global Interrupt                                           */
+
     NVIC_EnableIRQ(USART1_IRQn);                /*!< USART1 global Interrupt & EXTI Line25 Interrupt (USART1 wakeup) */
     NVIC_EnableIRQ(USART2_IRQn);                /*!< USART2 global Interrupt & EXTI Line26 Interrupt (USART2 wakeup) */
     NVIC_EnableIRQ(USART3_4_IRQn);              /*!< USART3 and USART4 global Interrupt                              */
-    HAL_NVIC_SetPriority(USART1_IRQn, 3, 0);
+    HAL_NVIC_SetPriority(USART1_IRQn, 2, 0);
-    HAL_NVIC_SetPriority(USART2_IRQn, 3, 0);
+    HAL_NVIC_SetPriority(USART2_IRQn, 2, 0);
-    HAL_NVIC_SetPriority(USART3_4_IRQn, 3, 0);
+    HAL_NVIC_SetPriority(USART3_4_IRQn, 2, 0);
+
 //    NVIC_EnableIRQ(CEC_CAN_IRQn);               /*!< CEC and CAN global Interrupts & EXTI Line27 Interrupt           */
 
 //    NVIC_EnableIRQ(TIM1_BRK_UP_TRG_COM_IRQn);   /*!< TIM1 Break, Update, Trigger and Commutation Interrupt           */ // - handled by hal msp init
@@ -130,6 +155,10 @@ static struct cbslot *get_slot_for_periph(void *periph)
         else if (periph == USART5) slot = &callbacks.usart5;
 #endif
 
+    else if (periph == TIM6) slot = &callbacks.tim6;
+    else if (periph == TIM7) slot = &callbacks.tim7;
+    else if (periph == TIM15) slot = &callbacks.tim15;
+
     else if (periph >= EXTIS[0] && periph <= EXTIS[15]) {
         slot = &callbacks.exti[periph - EXTIS[0]];
     }
@@ -265,6 +294,26 @@ void EXTI4_15_IRQHandler(void)
 }
 
 
+// ------------ INTERRUPTS -------------
+
+// TIM14 is used to generate HAL timebase and its handler is in the file "timebase.c"
+
+void TIM6_DAC_IRQHandler(void)
+{
+    CALL_IRQ_HANDLER(callbacks.tim6);
+}
+
+void TIM7_IRQHandler(void)
+{
+    CALL_IRQ_HANDLER(callbacks.tim7);
+}
+
+void TIM15_IRQHandler(void)
+{
+    CALL_IRQ_HANDLER(callbacks.tim15);
+}
+
+
 // other ISRs...
 
 #if 0

platform/platform.c

@@ -13,6 +13,7 @@
 #include "units/neopixel/unit_neopixel.h"
 #include "units/i2c/unit_i2c.h"
 #include "units/1wire/unit_1wire.h"
+#include "units/adc/unit_adc.h"
 #include "units/test/unit_test.h"
 #include "units/usart/unit_usart.h"
 #include "units/spi/unit_spi.h"
@@ -84,6 +85,7 @@ void plat_init_resources(void)
     ureg_add_type(&UNIT_SPI);
     ureg_add_type(&UNIT_USART);
     ureg_add_type(&UNIT_1WIRE);
+    ureg_add_type(&UNIT_ADC);
 
     // Free all present resources
     {

platform/platform.h

@@ -13,6 +13,7 @@
 #include <stddef.h>
 #include <string.h>
 #include <malloc.h>
+#include <math.h>
 
 // FreeRTOS includes
 #include <cmsis_os.h>

platform/timebase.c

@@ -15,6 +15,8 @@ HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
     // This makes it a good choice for the timebase generation. We set it to generate
     // an interrupt every 1 ms
 
+    assert_param(TickPriority == 0); // any other setting can lead to crashes
+
     // - TIM14 is always up-counting
     // - using APB1 clock
     __HAL_RCC_TIM14_CLK_ENABLE();

units/1wire/_ow_init.c

@@ -7,7 +7,6 @@
 
 #define OW_INTERNAL
 #include "_ow_internal.h"
-#include "_ow_init.h"
 
 /** Allocate data structure and set defaults */
 error_t OW_preInit(Unit *unit)

units/1wire/_ow_internal.h

@@ -27,9 +27,6 @@ struct priv {
     struct ow_search_state searchState;
 };
 
-/** Allocate data structure and set defaults */
-error_t OW_preInit(Unit *unit);
-
 /** Load from a binary buffer stored in Flash */
 void OW_loadBinary(Unit *unit, PayloadParser *pp);
 

units/1wire/_ow_search.c

@@ -9,7 +9,6 @@
 #include "_ow_search.h"
 #include "_ow_internal.h"
 #include "_ow_low_level.h"
-#include "_ow_checksum.h"
 #include "_ow_commands.h"
 
 void ow_search_init(Unit *unit, uint8_t command, bool test_checksums)

units/1wire/_ow_settings.c

@@ -7,7 +7,6 @@
 
 #define OW_INTERNAL
 #include "_ow_internal.h"
-#include "_ow_settings.h"
 
 /** Load from a binary buffer stored in Flash */
 void OW_loadBinary(Unit *unit, PayloadParser *pp)

units/1wire/unit_1wire.c

@@ -9,8 +9,6 @@
 // 1WIRE master
 #define OW_INTERNAL
 #include "_ow_internal.h"
-#include "_ow_init.h"
-#include "_ow_settings.h"
 #include "_ow_low_level.h"
 
 /**

units/adc/_adc_init.c

@@ -8,29 +8,241 @@
 #define ADC_INTERNAL
 #include "_adc_internal.h"
 
+const uint32_t LL_ADC_SAMPLETIMES[] = {
+    LL_ADC_SAMPLINGTIME_1CYCLE_5,
+    LL_ADC_SAMPLINGTIME_7CYCLES_5,
+    LL_ADC_SAMPLINGTIME_13CYCLES_5,
+    LL_ADC_SAMPLINGTIME_28CYCLES_5,
+    LL_ADC_SAMPLINGTIME_41CYCLES_5,
+    LL_ADC_SAMPLINGTIME_55CYCLES_5,
+    LL_ADC_SAMPLINGTIME_71CYCLES_5,
+    LL_ADC_SAMPLINGTIME_239CYCLES_5,
+};
+
+
 /** Allocate data structure and set defaults */
 error_t UADC_preInit(Unit *unit)
 {
     struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
     if (priv == NULL) return E_OUT_OF_MEM;
 
-    //
+    priv->channels = 1; // PA0
+    priv->enable_tsense = false;
+    priv->enable_vref = false;
+    priv->sample_time = 0b010; // 13.5c
+    priv->frequency = 4; //1000
 
     return E_SUCCESS;
 }
 
+static void UADC_DMA_Handler(void *arg)
+{
+    Unit *unit = arg;
+
+    dbg("ADC DMA ISR hit");
+    assert_param(unit);
+    struct priv *priv = unit->data;
+    assert_param(priv);
+
+    const uint32_t isrsnapshot = priv->DMAx->ISR;
+
+    if (LL_DMA_IsActiveFlag_G(isrsnapshot, priv->dma_chnum)) {
+        bool tc = LL_DMA_IsActiveFlag_TC(isrsnapshot, priv->dma_chnum);
+        bool ht = LL_DMA_IsActiveFlag_HT(isrsnapshot, priv->dma_chnum);
+
+        // Here we have to either copy it somewhere else, or notify another thread (queue?)
+        // that the data is ready for reading
+
+        if (ht) {
+            uint16_t start = 0;
+            uint16_t end = (uint16_t) (priv->dma_buffer_size / 2);
+            // TODO handle first half
+            LL_DMA_ClearFlag_HT(priv->DMAx, priv->dma_chnum);
+        }
+
+        if (tc) {
+            uint16_t start = (uint16_t) (priv->dma_buffer_size / 2);
+            uint16_t end = (uint16_t) priv->dma_buffer_size;
+            // TODO handle second half
+            LL_DMA_ClearFlag_TC(priv->DMAx, priv->dma_chnum);
+        }
+
+        if (LL_DMA_IsActiveFlag_TE(isrsnapshot, priv->dma_chnum)) {
+            // this shouldn't happen - error
+            dbg("ADC DMA TE!");
+            LL_DMA_ClearFlag_TE(priv->DMAx, priv->dma_chnum);
+        }
+    }
+}
+
 /** Finalize unit set-up */
 error_t UADC_init(Unit *unit)
 {
     bool suc = true;
     struct priv *priv = unit->data;
 
-    //
+    // Written for F072 which has only one ADC
+
+    TRY(rsc_claim(unit, R_ADC1));
+    TRY(rsc_claim(unit, R_DMA1_1));
+    TRY(rsc_claim(unit, R_TIM15));
+
+    priv->DMAx = DMA1;
+    priv->DMA_CHx = DMA1_Channel1;
+    priv->dma_chnum = 1;
+    priv->ADCx = ADC1;
+    priv->ADCx_Common = ADC1_COMMON;
+    priv->TIMx = TIM15;
+
+    // ----------------------- CONFIGURE PINS --------------------------
+    {
+        // Claim and configure all analog pins
+        priv->nb_channels = 0;
+        for (uint8_t i = 0; i < 16; i++) {
+            if (priv->channels & (1 << i)) {
+                char c;
+                uint8_t num;
+                if (i <= 7) {
+                    c = 'A';
+                    num = i;
+                }
+                else if (i <= 9) {
+                    c = 'B';
+                    num = (uint8_t) (i - 8);
+                }
+                else {
+                    c = 'C';
+                    num = (uint8_t) (i - 10);
+                }
+
+                TRY(rsc_claim_pin(unit, c, num));
+                uint32_t ll_pin = hw_pin2ll(num, &suc);
+                GPIO_TypeDef *port = hw_port2periph(c, &suc);
+                assert_param(suc);
+
+                LL_GPIO_SetPinPull(port, ll_pin, LL_GPIO_PULL_NO);
+                LL_GPIO_SetPinMode(port, ll_pin, LL_GPIO_MODE_ANALOG);
+                priv->nb_channels++;
+            }
+        }
+        if (priv->enable_tsense) priv->nb_channels++;
+        if (priv->enable_vref) priv->nb_channels++;
+
+        if (priv->nb_channels == 0) {
+            dbg("!! Need at least 1 channel");
+            return E_BAD_CONFIG;
+        }
+    }
+
+    // ------------------- ENABLE CLOCKS --------------------------
+    {
+        // enable peripherals clock
+        hw_periph_clock_enable(priv->ADCx);
+        hw_periph_clock_enable(priv->TIMx);
+    }
+
+    // ------------------- CONFIGURE THE TIMER --------------------------
+    dbg("Setting up TIMER");
+    {
+        // Find suitable timer values
+        uint16_t presc;
+        uint32_t count;
+        float real_freq;
+        if (!solve_timer(PLAT_APB1_HZ, priv->frequency, true, &presc, &count,
+                         &real_freq)) {
+            dbg("Failed to resolve timer params.");
+            return E_BAD_VALUE;
+        }
+        dbg("Frequency error %d ppm, presc %d, count %d",
+            (int) lrintf(1000000.0f * ((real_freq - priv->frequency) / (float)priv->frequency)), (int) presc, (int) count);
+
+        LL_TIM_SetPrescaler(priv->TIMx, (uint32_t) (presc - 1));
+        LL_TIM_SetAutoReload(priv->TIMx, count - 1);
+        LL_TIM_EnableARRPreload(priv->TIMx);
+        LL_TIM_EnableUpdateEvent(priv->TIMx);
+        LL_TIM_GenerateEvent_UPDATE(priv->TIMx); // load the prescaller value
+    }
+
+    // --------------------- CONFIGURE THE ADC ---------------------------
+    dbg("Setting up ADC");
+    {
+        // Calibrate the ADC
+        dbg("Wait for calib");
+        LL_ADC_StartCalibration(priv->ADCx);
+        while (LL_ADC_IsCalibrationOnGoing(priv->ADCx)) {}
+        dbg("ADC calibrated.");
+
+        uint32_t mask = 0;
+        if (priv->enable_vref) mask |= LL_ADC_PATH_INTERNAL_VREFINT;
+        if (priv->enable_tsense) mask |= LL_ADC_PATH_INTERNAL_TEMPSENSOR;
+        LL_ADC_SetCommonPathInternalCh(priv->ADCx_Common, mask);
+        LL_ADC_SetDataAlignment(priv->ADCx, LL_ADC_DATA_ALIGN_RIGHT);
+        LL_ADC_SetResolution(priv->ADCx, LL_ADC_RESOLUTION_12B);
+        LL_ADC_REG_SetDMATransfer(priv->ADCx, LL_ADC_REG_DMA_TRANSFER_UNLIMITED);
+
+        // configure channels
+        LL_ADC_REG_SetSequencerChannels(priv->ADCx, priv->channels);
+        if (priv->enable_tsense) LL_ADC_REG_SetSequencerChAdd(priv->ADCx, LL_ADC_CHANNEL_TEMPSENSOR);
+        if (priv->enable_vref) LL_ADC_REG_SetSequencerChAdd(priv->ADCx, LL_ADC_CHANNEL_VREFINT);
+
+        LL_ADC_REG_SetTriggerSource(priv->ADCx, LL_ADC_REG_TRIG_EXT_TIM15_TRGO);
+
+        LL_ADC_SetSamplingTimeCommonChannels(priv->ADCx, LL_ADC_SAMPLETIMES[priv->sample_time]);
+
+        LL_ADC_Enable(priv->ADCx);
+    }
+
+    // --------------------- CONFIGURE DMA -------------------------------
+    dbg("Setting up DMA");
+    {
+        // The length must be a 2*multiple of the number of channels
+        // this is a horrible way to do it but will work
+        uint16_t itemcount = (uint16_t) (priv->nb_channels * (uint16_t) (UADC_DMA_MAX_BUF_LEN / (2 * priv->nb_channels)));
+        priv->dma_buffer_size = (uint16_t) (itemcount * 2);
+        dbg("DMA item count is %d (%d bytes)", itemcount, priv->dma_buffer_size);
+
+        priv->dma_buffer = malloc_ck(priv->dma_buffer_size);
+        if (NULL == priv->dma_buffer) return E_OUT_OF_MEM;
+        assert_param(((uint32_t) priv->dma_buffer & 3) == 0); // must be aligned
+
+        {
+            LL_DMA_InitTypeDef init;
+            LL_DMA_StructInit(&init);
+            init.Direction = LL_DMA_DIRECTION_PERIPH_TO_MEMORY;
+
+            init.Mode = LL_DMA_MODE_CIRCULAR;
+            init.NbData = itemcount;
+
+            init.PeriphOrM2MSrcAddress = (uint32_t) &priv->ADCx->DR;
+            init.PeriphOrM2MSrcDataSize = LL_DMA_PDATAALIGN_HALFWORD;
+            init.PeriphOrM2MSrcIncMode = LL_DMA_PERIPH_NOINCREMENT;
+
+            init.MemoryOrM2MDstAddress = (uint32_t) priv->dma_buffer;
+            init.MemoryOrM2MDstDataSize = LL_DMA_MDATAALIGN_HALFWORD;
+            init.MemoryOrM2MDstIncMode = LL_DMA_MEMORY_INCREMENT;
+
+            assert_param(SUCCESS == LL_DMA_Init(priv->DMAx, priv->dma_chnum, &init));
+
+            irqd_attach(priv->DMA_CHx, UADC_DMA_Handler, unit);
+            // Interrupt on transfer 1/2 and complete
+            // We will capture the first and second half and send it while the other half is being filled.
+            LL_DMA_EnableIT_HT(priv->DMAx, priv->dma_chnum);
+            LL_DMA_EnableIT_TC(priv->DMAx, priv->dma_chnum);
+        }
+
+        LL_DMA_EnableChannel(priv->DMAx, priv->dma_chnum);
+    }
+
+    dbg("ADC inited, starting the timer ...");
+
+    // FIXME - temporary demo - counter start...
+    LL_TIM_EnableCounter(priv->TIMx);
 
     return E_SUCCESS;
 }
 
 
+
 /** Tear down the unit */
 void UADC_deInit(Unit *unit)
 {
@@ -38,7 +250,14 @@ void UADC_deInit(Unit *unit)
 
     // de-init peripherals
     if (unit->status == E_SUCCESS ) {
-        //
+        //LL_ADC_DeInit(priv->ADCx);
+        LL_ADC_CommonDeInit(priv->ADCx_Common);
+        LL_TIM_DeInit(priv->TIMx);
+
+        irqd_detach(priv->DMAx, UADC_DMA_Handler);
+        LL_DMA_DeInit(priv->DMAx, priv->dma_chnum);
+
+        free_ck(priv->dma_buffer);
     }
 
     // Release all resources, deinit pins

units/adc/_adc_internal.h

@@ -14,10 +14,32 @@
 /** Private data structure */
 struct priv {
     // settings
+    uint16_t channels;    //!< bit flags (will be recorded in order 0-15)
+    bool enable_tsense;   //!< append a signal from the temperature channel (voltage proportional to Tj)
+    bool enable_vref;  //!< append a signal from the internal voltage reference
+    uint8_t sample_time;  //!< 0-7 (corresponds to 1.5-239.5 cycles) - time for the sampling capacitor to charge
+    uint32_t frequency;   //!< Timer frequency in Hz. Note: not all frequencies can be achieved accurately
+
+    // TODO averaging (maybe a separate component?)
+    // TODO threshold watchdog with hysteresis (maybe a separate component?)
+    // TODO trigger level, edge direction, hold-off, pre-trigger buffer (extract from the DMA buffer)
 
     // internal state
+    ADC_TypeDef *ADCx;
+    ADC_Common_TypeDef *ADCx_Common;
+    TIM_TypeDef *TIMx;
+    DMA_TypeDef *DMAx;
+    uint8_t dma_chnum;
+    DMA_Channel_TypeDef *DMA_CHx;
+    uint16_t *dma_buffer;
+    uint8_t nb_channels; // nr of enabled adc channels
+    uint16_t dma_buffer_size; // real number of bytes
 };
 
+// max size of the DMA buffer. The actual buffer size will be adjusted to accommodate
+// an even number of sample groups (sets of channels)
+#define UADC_DMA_MAX_BUF_LEN 512
+
 /** Allocate data structure and set defaults */
 error_t UADC_preInit(Unit *unit);
 

units/adc/_adc_settings.c

@@ -16,7 +16,11 @@ void UADC_loadBinary(Unit *unit, PayloadParser *pp)
     uint8_t version = pp_u8(pp);
     (void)version;
 
-    //
+    priv->channels = pp_u16(pp);
+    priv->enable_tsense = pp_bool(pp);
+    priv->enable_vref = pp_bool(pp);
+    priv->sample_time = pp_u8(pp);
+    priv->frequency = pp_u32(pp);
 }
 
 /** Write to a binary buffer for storing in Flash */
@@ -26,7 +30,11 @@ void UADC_writeBinary(Unit *unit, PayloadBuilder *pb)
 
     pb_u8(pb, 0); // version
 
-    //
+    pb_u16(pb, priv->channels);
+    pb_bool(pb, priv->enable_tsense);
+    pb_bool(pb, priv->enable_vref);
+    pb_u8(pb, priv->sample_time);
+    pb_u32(pb, priv->frequency);
 }
 
 // ------------------------------------------------------------------------
@@ -37,8 +45,21 @@ error_t UADC_loadIni(Unit *unit, const char *key, const char *value)
     bool suc = true;
     struct priv *priv = unit->data;
 
-    if (false) {
+    if (streq(key, "channels")) {
-        //
+        priv->channels = parse_pinmask(value, &suc);
+    }
+    else if (streq(key, "enable_tsense")) {
+        priv->enable_tsense = str_parse_yn(value, &suc);
+    }
+    else if (streq(key, "enable_vref")) {
+        priv->enable_vref = str_parse_yn(value, &suc);
+    }
+    else if (streq(key, "sample_time")) {
+        priv->sample_time = (uint8_t) avr_atoi(value);
+        if (priv->sample_time > 7) return E_BAD_VALUE;
+    }
+    else if (streq(key, "frequency")) {
+        priv->frequency = (uint32_t) avr_atoi(value);
     }
     else {
         return E_BAD_KEY;
@@ -53,6 +74,20 @@ void UADC_writeIni(Unit *unit, IniWriter *iw)
 {
     struct priv *priv = unit->data;
 
-    //
+    iw_comment(iw, "Enabled channels, comma separated");
+    iw_comment(iw, "0-7 = A0-A7, 8-9 = B0-B1, 10-15 = C0-C5");
+    iw_entry(iw, "channels", "%s", pinmask2str_up(priv->channels, unit_tmp512));
+
+    iw_comment(iw, "Enable Tsense channel");
+    iw_entry(iw, "enable_tsense", str_yn(priv->enable_tsense));
+
+    iw_comment(iw, "Enable Vref channel");
+    iw_entry(iw, "enable_vref", str_yn(priv->enable_tsense));
+
+    iw_comment(iw, "Sampling time (0-7)");
+    iw_entry(iw, "sample_time", "%d", (int)priv->sample_time);
+
+    iw_comment(iw, "Sampling frequency (Hz)");
+    iw_entry(iw, "frequency", "%d", (int)priv->frequency);
 }
 

units/adc/unit_adc.c

@@ -11,7 +11,7 @@
 // ------------------------------------------------------------------------
 
 enum TplCmd_ {
-    //
+    CMD_DUMMY,
 };
 
 /** Handle a request message */
@@ -28,7 +28,7 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
 /** Unit template */
 const UnitDriver UNIT_ADC = {
     .name = "ADC",
-    .description = "Template unit",
+    .description = "Analog inputs",
     // Settings
     .preInit = UADC_preInit,
     .cfgLoadBinary = UADC_loadBinary,

units/digital_in/_din_init.c

@@ -7,8 +7,6 @@
 
 #define DIN_INTERNAL
 #include "_din_internal.h"
-#include "_din_init.h"
-#include "_din_exti.h"
 
 /** Allocate data structure and set defaults */
 error_t DIn_preInit(Unit *unit)

units/digital_in/_din_settings.c

@@ -7,7 +7,6 @@
 
 #define DIN_INTERNAL
 #include "_din_internal.h"
-#include "_din_settings.h"
 
 /** Load from a binary buffer stored in Flash */
 void DIn_loadBinary(Unit *unit, PayloadParser *pp)

units/digital_in/unit_din.c

@@ -7,8 +7,6 @@
 
 #define DIN_INTERNAL
 #include "_din_internal.h"
-#include "_din_settings.h"
-#include "_din_init.h"
 
 // ------------------------------------------------------------------------
 

units/digital_out/_dout_init.c

@@ -7,7 +7,6 @@
 
 #define DOUT_INTERNAL
 #include "_dout_internal.h"
-#include "_dout_init.h"
 
 /** Allocate data structure and set defaults */
 error_t DOut_preInit(Unit *unit)

units/digital_out/_dout_settings.c

@@ -7,7 +7,6 @@
 
 #define DOUT_INTERNAL
 #include "_dout_internal.h"
-#include "_dout_settings.h"
 
 /** Load from a binary buffer stored in Flash */
 void DOut_loadBinary(Unit *unit, PayloadParser *pp)

units/i2c/_i2c_init.c

@@ -118,8 +118,8 @@ error_t UI2C_init(Unit *unit)
     TRY(rsc_claim_pin(unit, portname, pin_sda));
     TRY(rsc_claim_pin(unit, portname, pin_scl));
 
-    hw_configure_gpio_af(portname, pin_sda, af_i2c);
+    TRY(hw_configure_gpio_af(portname, pin_sda, af_i2c));
-    hw_configure_gpio_af(portname, pin_scl, af_i2c);
+    TRY(hw_configure_gpio_af(portname, pin_scl, af_i2c));
 
     hw_periph_clock_enable(priv->periph);
 

units/i2c/_i2c_settings.c

@@ -7,7 +7,6 @@
 
 #define I2C_INTERNAL
 #include "_i2c_internal.h"
-#include "_i2c_settings.h"
 
 /** Load from a binary buffer stored in Flash */
 void UI2C_loadBinary(Unit *unit, PayloadParser *pp)

units/neopixel/_npx_init.c

@@ -13,7 +13,7 @@
 error_t Npx_preInit(Unit *unit)
 {
     struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
-    if (priv == NULL)
+    if (priv == NULL) return E_OUT_OF_MEM;
 
     // some defaults
     priv->pin_number = 0;

units/spi/_spi_init.c

@@ -132,9 +132,9 @@ error_t USPI_init(Unit *unit)
     TRY(rsc_claim_pin(unit, spi_portname, pin_miso));
     TRY(rsc_claim_pin(unit, spi_portname, pin_sck));
 
-    hw_configure_gpio_af(spi_portname, pin_mosi, af_spi);
+    TRY(hw_configure_gpio_af(spi_portname, pin_mosi, af_spi));
-    hw_configure_gpio_af(spi_portname, pin_miso, af_spi);
+    TRY(hw_configure_gpio_af(spi_portname, pin_miso, af_spi));
-    hw_configure_gpio_af(spi_portname, pin_sck, af_spi);
+    TRY(hw_configure_gpio_af(spi_portname, pin_sck, af_spi));
 
     // configure SSN GPIOs
     {

units/test/unit_test.c

@@ -112,7 +112,7 @@ static void bw_dump(struct bulk_write *bulk, const uint8_t *chunk, uint32_t len)
     }
 
     dbg("\r\nBulk write at %d, len %d", (int)bulk->offset, (int)len);
-    PUTSN((const char *) chunk, len);
+    PUTSN((const char *) chunk, (uint16_t) len);
     PUTS("\r\n");
 }
 

units/usart/_usart_dmas.c

@@ -190,7 +190,6 @@ error_t UUSART_SetupDMAs(Unit *unit)
     LL_DMA_EnableChannel(priv->dma, priv->dma_rx_chnum);
     LL_DMA_EnableChannel(priv->dma, priv->dma_tx_chnum);
 
-    // TODO also set up usart timeout interrupt that grabs whatever is in the DMA buffer and sends it
     return E_SUCCESS;
 }
 
@@ -205,7 +204,7 @@ static void UUSART_DMA_RxHandler(void *arg)
     struct priv *priv = unit->data;
     assert_param(priv);
 
-    uint32_t isrsnapshot = priv->dma->ISR;
+    const uint32_t isrsnapshot = priv->dma->ISR;
 
     if (LL_DMA_IsActiveFlag_G(isrsnapshot, priv->dma_rx_chnum)) {
         bool tc = LL_DMA_IsActiveFlag_TC(isrsnapshot, priv->dma_rx_chnum);
@@ -228,6 +227,7 @@ static void UUSART_DMA_RxHandler(void *arg)
 
         if (LL_DMA_IsActiveFlag_TE(isrsnapshot, priv->dma_rx_chnum)) {
             // this shouldn't happen
+            dbg("USART DMA TE!");
             LL_DMA_ClearFlag_TE(priv->dma, priv->dma_rx_chnum);
         }
     }

units/usart/_usart_init.c

@@ -1,7 +1,6 @@
 //
 // Created by MightyPork on 2018/01/14.
 //
-#include <platform/irq_dispatcher.h>
 #include "platform.h"
 #include "unit_base.h"
 
@@ -25,7 +24,7 @@ error_t UUSART_preInit(Unit *unit)
     priv->baudrate = 115200;
     priv->parity = 0;         //!< 0-none, 1-odd, 2-even
     priv->stopbits = 1;       //!< 0-half, 1-one, 2-1.5, 3-two
-    priv->direction = 3; // RXTX
+    priv->direction = UUSART_DIRECTION_RXTX; // RXTX
 
     priv->hw_flow_control = false;
     priv->clock_output = false;
@@ -205,7 +204,7 @@ static inline error_t UUSART_configPins(Unit *unit)
         if (pins_wanted[i]) {
             if (mappings[i].port == 0) return E_BAD_CONFIG;
             TRY(rsc_claim_pin(unit, mappings[i].port, mappings[i].pin));
-            hw_configure_gpio_af(mappings[i].port, mappings[i].pin, mappings[i].af);
+            TRY(hw_configure_gpio_af(mappings[i].port, mappings[i].pin, mappings[i].af));
         }
     }
 
@@ -252,8 +251,8 @@ error_t UUSART_init(Unit *unit)
                                                        : LL_USART_STOPBITS_2);
 
         LL_USART_SetTransferDirection(priv->periph,
-                                      priv->direction == 1 ? LL_USART_DIRECTION_RX :
+                                      (priv->direction == UUSART_DIRECTION_RX) ? LL_USART_DIRECTION_RX :
-                                      priv->direction == 2 ? LL_USART_DIRECTION_TX
+                                      (priv->direction == UUSART_DIRECTION_TX) ? LL_USART_DIRECTION_TX
                                                                                : LL_USART_DIRECTION_TX_RX);
 
         LL_USART_SetHWFlowCtrl(priv->periph,

units/usart/_usart_internal.h

@@ -17,6 +17,10 @@
 #define UUSART_RXBUF_LEN 128
 #define UUSART_TXBUF_LEN 128
 
+#define UUSART_DIRECTION_RX 1
+#define UUSART_DIRECTION_TX 2
+#define UUSART_DIRECTION_RXTX 3
+
 /** Private data structure */
 struct priv {
     uint8_t periph_num; //!< 1-6

units/usart/_usart_settings.c

@@ -104,9 +104,9 @@ error_t UUSART_loadIni(Unit *unit, const char *key, const char *value)
     }
     else if (streq(key, "direction")) {
         priv->direction = (uint8_t) str_parse_3(value,
-                                                "RX", 1,
+                                                "RX", UUSART_DIRECTION_RX,
-                                                "TX", 2,
+                                                "TX", UUSART_DIRECTION_TX,
-                                                "RXTX", 3, &suc);
+                                                "RXTX", UUSART_DIRECTION_RXTX, &suc);
     }
     else if (streq(key, "hw-flow-control")) {
         priv->hw_flow_control = (uint8_t) str_parse_4(value,

utils/malloc_safe.h

@@ -15,10 +15,10 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-void *malloc_ck_do(size_t size, const char* file, uint32_t line) __attribute__((malloc));
+void *malloc_ck_do(size_t size, const char* file, uint32_t line) __attribute__((malloc,warn_unused_result));
-void *calloc_ck_do(size_t nmemb, size_t size, const char* file, uint32_t line) __attribute__((malloc));
+void *calloc_ck_do(size_t nmemb, size_t size, const char* file, uint32_t line) __attribute__((malloc,warn_unused_result));
-char *strdup_ck_do(const char *s, const char* file, uint32_t line) __attribute__((malloc));
+char *strdup_ck_do(const char *s, const char* file, uint32_t line) __attribute__((malloc,warn_unused_result));
-char *strndup_ck_do(const char *s, uint32_t len, const char* file, uint32_t line) __attribute__((malloc));
+char *strndup_ck_do(const char *s, uint32_t len, const char* file, uint32_t line) __attribute__((malloc,warn_unused_result));
 
 #if DEBUG_MALLOC
 

utils/stacksmon.h

@@ -12,7 +12,7 @@
 #if USE_STACK_MONITOR
 
 /** Number of tracked stacks, max */
-#define STACK_NUM 3
+#define STACK_NUM 4
 
 /**
  * Check canaries and trap if they're dead