provisions for representing pins via resources in settings

framework/resources.c

@@ -21,10 +21,8 @@ const char *const rsc_names[] = {
 #undef X
 };
 
-// Check that EXTI have higher values than GPIOs in the enum
-// (determines the logic in the name generation code below)
-COMPILER_ASSERT(R_EXTI0 > R_PA0);
-
+COMPILER_ASSERT(R_PF15 < R_EXTI0);
+COMPILER_ASSERT(R_PA0 == 0);
 
 const char * rsc_get_name(Resource rsc)
 {
@@ -34,21 +32,22 @@ const char * rsc_get_name(Resource rsc)
     // we assume the returned value is not stored anywhere
     // and is directly used in a sprintf call, hence a static buffer is OK to use
 
-    if (rsc >= R_EXTI0) {
+    if (rsc >= R_EXTI0 && rsc <= R_EXTI15) {
         uint8_t index = rsc - R_EXTI0;
         SNPRINTF(gpionamebuf, 8, "EXTI%d", index);
         return gpionamebuf;
     }
 
-    if (rsc >= R_PA0) {
+    // R_PA0 is 0
+    if (rsc <= R_PF15) {
         // we assume the returned value is not stored anywhere
         // and is directly used in a sprintf call.
-        uint8_t index = rsc - R_PA0;
+        uint8_t index = rsc;
         SNPRINTF(gpionamebuf, 8, "P%c%d", 'A'+(index/16), index%16);
         return gpionamebuf;
     }
 
-    return rsc_names[rsc];
+    return rsc_names[rsc - R_EXTI15 - 1];
 }
 
 
@@ -222,7 +221,7 @@ void rsc_print_all_available(IniWriter *iw)
 
     uint32_t count0 = (iw->count + iw->skip);
     bool first = true;
-    for (uint32_t rsc = 0; rsc < R_PA0; rsc++) {
+    for (uint32_t rsc = R_EXTI15+1; rsc < R_NONE; rsc++) {
         if (RSC_IS_HELD(scratchmap, (Resource)rsc)) continue;
         if (!first) iw_string(iw, ", ");
 

framework/rsc_enum.h

@@ -59,9 +59,9 @@ typedef enum hw_resource Resource;
 /** Enum of all resources */
 enum hw_resource {
 #define X(res_name) R_##res_name,
-    XX_RESOURCES
     XX_RESOURCES_GPIO
     XX_RESOURCES_EXTI
+    XX_RESOURCES
 #undef X
     R_NONE,
     RESOURCE_COUNT = R_NONE,

platform/hw_utils.c

@@ -395,6 +395,53 @@ bool solve_timer(uint32_t base_freq, uint32_t required_freq, bool is16bit,
 }
 
 
+/** Parse a string representation of a pin directly to a resource constant */
+Resource parse_pin2rsc(const char *str, bool *suc)
+{
+    char pname;
+    uint8_t pnum;
+
+    if (!parse_pin(str, &pname, &pnum)) {
+        *suc = false;
+        return R_NONE;
+    }
+
+    return hw_pin2resource(pname, pnum, suc);
+}
+
+/** Convert a resource to a pin name - uses a static buffer, result must not be stored! */
+char *str_rsc2pin(Resource rsc)
+{
+    static char buf[4];
+    uint32_t index = rsc - R_PA0;
+    uint32_t portnum = (index/16);
+    uint8_t pinnum = (uint8_t) (index % 16);
+    if (portnum >= PORTS_COUNT) return "";
+    buf[0] = (char) ('A' + portnum);
+    if (pinnum>9) {
+        buf[1] = '1';
+        buf[2] = (char) ('0' + (pinnum - 10));
+        buf[3] = 0;
+    } else {
+        buf[1] = (char) ('0' + pinnum);
+        buf[2] = 0;
+    }
+    return buf;
+}
+
+/** Convert a pin resource to it's LL lib values */
+bool pinRsc2ll(Resource rsc, GPIO_TypeDef **port, uint32_t *llpin)
+{
+    uint32_t index = rsc - R_PA0;
+    uint32_t pname = (index/16);
+    uint8_t pnum = (uint8_t) (index % 16);
+    if (pname >= PORTS_COUNT) return false;
+    *port = GPIO_PERIPHS[pname];
+    *llpin = LL_GPIO_PINS[pnum];
+    return true;
+}
+
+
 void hw_periph_clock_enable(void *periph)
 {
     // GPIOs are enabled by default on start-up

platform/hw_utils.h

@@ -50,6 +50,33 @@ GPIO_TypeDef *hw_port2periph(char port_name, bool *suc);
  */
 bool parse_pin(const char *str, char *targetName, uint8_t *targetNumber);
 
+/**
+ * Parse a string representation of a pin directly to a resource constant
+ *
+ * @param[in]  str - source string - e.g. PA0 or A0
+ * @param[out] suc - written to false on failure
+ * @return the parsed resource
+ */
+Resource parse_pin2rsc(const char *str, bool *suc);
+
+/**
+ * Convert a pin resource to it's LL lib values
+ *
+ * @param[in]  rsc - resource to process
+ * @param[out] port - output port
+ * @param[out] llpin - output LL pin mask
+ * @return success
+ */
+bool pinRsc2ll(Resource rsc, GPIO_TypeDef **port, uint32_t *llpin);
+
+/**
+ * Convert a resource to a pin name - uses a static buffer, result must not be stored!
+ *
+ * @param[in] rsc - resource to print
+ * @return a pointer to a static buffer used for exporting the names
+ */
+char *str_rsc2pin(Resource rsc);
+
 /**
  * Parse a port name (one character) - validates that it's within range
  *