Merge pull request #1909 from xoviat/adc

stm32: generate adc_common and misc.

embassy-stm32/build.rs

@@ -817,6 +817,17 @@ fn main() {
     let mut peripherals_table: Vec<Vec<String>> = Vec::new();
     let mut pins_table: Vec<Vec<String>> = Vec::new();
     let mut dma_channels_table: Vec<Vec<String>> = Vec::new();
+    let mut adc_common_table: Vec<Vec<String>> = Vec::new();
+
+    /*
+        If ADC3_COMMON exists, ADC3 and higher are assigned to it
+        All other ADCs are assigned to ADC_COMMON
+
+        ADC3 and higher are assigned to the adc34 clock in the table
+        The adc3_common cfg directive is added if ADC3_COMMON exists
+    */
+    let has_adc3 = METADATA.peripherals.iter().find(|p| p.name == "ADC3_COMMON").is_some();
+    let set_adc345 = HashSet::from(["ADC3", "ADC4", "ADC5"]);
 
     for m in METADATA
         .memory
@@ -854,6 +865,17 @@ fn main() {
                 }
             }
 
+            if regs.kind == "adc" {
+                let (adc_common, adc_clock) = if set_adc345.contains(p.name) && has_adc3 {
+                    ("ADC3_COMMON", "adc34")
+                } else {
+                    ("ADC_COMMON", "adc")
+                };
+
+                let row = vec![p.name.to_string(), adc_common.to_string(), adc_clock.to_string()];
+                adc_common_table.push(row);
+            }
+
             for irq in p.interrupts {
                 let row = vec![
                     p.name.to_string(),
@@ -932,6 +954,7 @@ fn main() {
     make_table(&mut m, "foreach_peripheral", &peripherals_table);
     make_table(&mut m, "foreach_pin", &pins_table);
     make_table(&mut m, "foreach_dma_channel", &dma_channels_table);
+    make_table(&mut m, "foreach_adc", &adc_common_table);
 
     let out_dir = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
     let out_file = out_dir.join("_macros.rs").to_string_lossy().to_string();
@@ -973,6 +996,12 @@ fn main() {
         println!("cargo:rustc-cfg={}x{}", &chip_name[..9], &chip_name[10..11]);
     }
 
+    // =======
+    // ADC3_COMMON is present
+    if has_adc3 {
+        println!("cargo:rustc-cfg={}", "adc3_common");
+    }
+
     // =======
     // Features for targeting groups of chips
 

embassy-stm32/src/adc/f3.rs

@@ -50,7 +50,7 @@ impl<'d, T: Instance> Adc<'d, T> {
         while T::regs().cr().read().adcal() {}
 
         // Wait more than 4 clock cycles after adcal is cleared (RM0364 p. 223)
-        delay.delay_us(6 * 1_000_000 / Self::freq().0);
+        delay.delay_us(1 + (6 * 1_000_000 / Self::freq().0));
 
         // Enable the adc
         T::regs().cr().modify(|w| w.set_aden(true));

embassy-stm32/src/adc/mod.rs

@@ -56,127 +56,21 @@ pub trait Instance: sealed::Instance + crate::Peripheral<P = Self> + crate::rcc:
 pub trait AdcPin<T: Instance>: sealed::AdcPin<T> {}
 pub trait InternalChannel<T>: sealed::InternalChannel<T> {}
 
-#[cfg(not(any(stm32h7, adc_f3, adc_v4)))]
+foreach_adc!(
-foreach_peripheral!(
+    ($inst:ident, $common_inst:ident, $clock:ident) => {
-    (adc, $inst:ident) => {
         impl crate::adc::sealed::Instance for peripherals::$inst {
             fn regs() -> crate::pac::adc::Adc {
                 crate::pac::$inst
             }
+
             #[cfg(not(any(adc_f1, adc_v1, adc_f3_v2, adc_g0)))]
             fn common_regs() -> crate::pac::adccommon::AdcCommon {
-                foreach_peripheral!{
-                    (adccommon, $common_inst:ident) => {
                 return crate::pac::$common_inst
-                    };
-                }
-            }
-        }
-
-        impl crate::adc::Instance for peripherals::$inst {}
-    };
-);
-
-#[cfg(any(stm32h7, adc_f3, adc_v4))]
-foreach_peripheral!(
-    (adc, ADC3) => {
-        impl crate::adc::sealed::Instance for peripherals::ADC3 {
-            fn regs() -> crate::pac::adc::Adc {
-                crate::pac::ADC3
-            }
-            #[cfg(all(not(adc_f1), not(adc_v1)))]
-            #[allow(unreachable_code)]
-            fn common_regs() -> crate::pac::adccommon::AdcCommon {
-                foreach_peripheral!{
-                    (adccommon, ADC3_COMMON) => {
-                        return crate::pac::ADC3_COMMON
-                    };
-                    // Fall back to ADC_COMMON if ADC3_COMMON does not exist
-                    (adccommon, ADC_COMMON) => {
-                        return crate::pac::ADC_COMMON
-                    };
-                }
             }
 
             #[cfg(adc_f3)]
             fn frequency() -> crate::time::Hertz {
-                unsafe { crate::rcc::get_freqs() }.adc34.unwrap()
+                unsafe { crate::rcc::get_freqs() }.$clock.unwrap()
-            }
-        }
-
-        impl crate::adc::Instance for peripherals::ADC3 {}
-    };
-    (adc, ADC4) => {
-        impl crate::adc::sealed::Instance for peripherals::ADC4 {
-            fn regs() -> crate::pac::adc::Adc {
-                crate::pac::ADC4
-            }
-            #[cfg(not(any(adc_f1, adc_v1)))]
-            #[allow(unreachable_code)]
-            fn common_regs() -> crate::pac::adccommon::AdcCommon {
-                foreach_peripheral!{
-                    (adccommon, ADC3_COMMON) => {
-                        return crate::pac::ADC3_COMMON
-                    };
-                    // Fall back to ADC_COMMON if ADC3_COMMON does not exist
-                    (adccommon, ADC_COMMON) => {
-                        return crate::pac::ADC_COMMON
-                    };
-                }
-            }
-
-            #[cfg(adc_f3)]
-            fn frequency() -> crate::time::Hertz {
-                unsafe { crate::rcc::get_freqs() }.adc34.unwrap()
-            }
-        }
-
-        impl crate::adc::Instance for peripherals::ADC4 {}
-    };
-    (adc, ADC5) => {
-        impl crate::adc::sealed::Instance for peripherals::ADC5 {
-            fn regs() -> crate::pac::adc::Adc {
-                crate::pac::ADC5
-            }
-            #[cfg(not(any(adc_f1, adc_v1)))]
-            #[allow(unreachable_code)]
-            fn common_regs() -> crate::pac::adccommon::AdcCommon {
-                foreach_peripheral!{
-                    (adccommon, ADC3_COMMON) => {
-                        return crate::pac::ADC3_COMMON
-                    };
-                    // Fall back to ADC_COMMON if ADC3_COMMON does not exist
-                    (adccommon, ADC_COMMON) => {
-                        return crate::pac::ADC_COMMON
-                    };
-                }
-            }
-
-            #[cfg(adc_f3)]
-            fn frequency() -> crate::time::Hertz {
-                unsafe { crate::rcc::get_freqs() }.adc34.unwrap()
-            }
-        }
-
-        impl crate::adc::Instance for peripherals::ADC5 {}
-    };
-    (adc, $inst:ident) => {
-        impl crate::adc::sealed::Instance for peripherals::$inst {
-            fn regs() -> crate::pac::adc::Adc {
-                crate::pac::$inst
-            }
-            #[cfg(not(any(adc_f1, adc_v1)))]
-            fn common_regs() -> crate::pac::adccommon::AdcCommon {
-                foreach_peripheral!{
-                    (adccommon, ADC_COMMON) => {
-                        return crate::pac::ADC_COMMON
-                    };
-                }
-            }
-
-            #[cfg(adc_f3)]
-            fn frequency() -> crate::time::Hertz {
-                unsafe { crate::rcc::get_freqs() }.adc.unwrap()
             }
         }
 

embassy-stm32/src/rcc/f3.rs

@@ -280,7 +280,7 @@ pub(crate) unsafe fn init(config: Config) {
         }
     });
 
-    #[cfg(rcc_f3)]
+    #[cfg(all(rcc_f3, adc3_common))]
     let adc34 = config.adc.map(|adc| {
         if !adc.is_bus() {
             RCC.cfgr2().modify(|w| {
@@ -291,9 +291,13 @@ pub(crate) unsafe fn init(config: Config) {
                 Hertz(sysclk / adc as u32)
             })
         } else {
-            // TODO: need to use only if adc32_common is present
+            crate::pac::ADC3_COMMON.ccr().modify(|w| {
+                assert!(!(adc.bus_div() == 1 && hpre_bits != Hpre::DIV1));
 
-            todo!()
+                w.set_ckmode(adc.into());
+
+                Hertz(sysclk / adc.bus_div() as u32)
+            })
         }
     });
 
@@ -323,8 +327,10 @@ pub(crate) unsafe fn init(config: Config) {
         ahb1: Hertz(hclk),
         #[cfg(rcc_f3)]
         adc: adc,
-        #[cfg(rcc_f3)]
+        #[cfg(all(rcc_f3, adc3_common))]
         adc34: adc34,
+        #[cfg(all(rcc_f3, not(adc3_common)))]
+        adc34: None,
         #[cfg(stm32f334)]
         hrtim: hrtim,
     });