From 61262435a88aa5683eac403f532fc519dbf4aa07 Mon Sep 17 00:00:00 2001
From: Edward Emelianov <edward.emelianoff@gmail.com>
Date: Sun, 15 Mar 2026 02:24:58 +0300
Subject: [PATCH] start adding PWM

---
 F0:F030,F042,F072/usbcan_gpio/gpio.c          | 100 +++++++++++++++---
 F0:F030,F042,F072/usbcan_gpio/gpio.h          |  12 +++
 F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp   |  24 ++++-
 F0:F030,F042,F072/usbcan_gpio/pwm.c           |  32 ++++++
 F0:F030,F042,F072/usbcan_gpio/pwm.h           |  21 ++++
 F0:F030,F042,F072/usbcan_gpio/usbcangpio.bin  | Bin 24296 -> 24872 bytes
 .../usbcan_gpio/usbcangpio.creator.user       |   2 +-
 .../usbcan_gpio/usbcangpio.files              |   2 +
 F0:F030,F042,F072/usbcan_gpio/version.inc     |   4 +-
 9 files changed, 175 insertions(+), 22 deletions(-)
 create mode 100644 F0:F030,F042,F072/usbcan_gpio/pwm.c
 create mode 100644 F0:F030,F042,F072/usbcan_gpio/pwm.h

diff --git a/F0:F030,F042,F072/usbcan_gpio/gpio.c b/F0:F030,F042,F072/usbcan_gpio/gpio.c
index ff86226..ad1edf9 100644
--- a/F0:F030,F042,F072/usbcan_gpio/gpio.c
+++ b/F0:F030,F042,F072/usbcan_gpio/gpio.c
@@ -42,41 +42,93 @@ typedef struct{
 #define CANUSART(x) ((x) & (1<<FUNC_USART))
 #define CANSPI(x)   ((x) & (1<<FUNC_SPI))
 #define CANI2C(x)   ((x) & (1<<FUNC_I2C))
+#define CANPWM(x)   ((x) & (1<<FUNC_PWM))
 
 // AF for USART, SPI, I2C:
 #define _U(x)  [FUNC_USART] = x
 // _S(0) or _U(0) have no sence, but lets understand that this pin have SPI or USART
 #define _S(x)  [FUNC_SPI] = x
 #define _I(x)  [FUNC_I2C] = x
+#define _P(x)  [FUNC_PWM] = x
+// Here included only common AF for STM32F042 and STM32F072 and without negative timer outputs (stars - collisions)
 static const pinprops_t pin_props[2][16] = {
     [0] = { // PORT A
-        [0]  = { .funcs = 0b00000001, .AF = {0}}, // PA0: ADC0, AF2 (TIM2_CH1)
-        [1]  = { .funcs = 0b00000001, .AF = {0}}, // PA1: ADC1, AF2 (TIM2_CH2)
-        [2]  = { .funcs = 0b00000011, .AF = {_U(1)}}, // PA2: ADC2, AF2 (TIM2_CH3), AF1 (USART2_TX)
-        [3]  = { .funcs = 0b00000011, .AF = {_U(1)}}, // PA3: ADC3, AF2 (TIM2_CH4), AF1 (USART2_RX)
+        [0]  = { .funcs = 0b00000001, .AF = {0}}, // PA0: ADC0
+        [1]  = { .funcs = 0b00010001, .AF = {_P(2)}}, // PA1: ADC1, AF2 (TIM2_CH2*)
+        [2]  = { .funcs = 0b00010011, .AF = {_U(1), _P(2)}}, // PA2: ADC2, AF2 (TIM2_CH3**), AF1 (USART2_TX)
+        [3]  = { .funcs = 0b00010011, .AF = {_U(1), _P(2)}}, // PA3: ADC3, AF2 (TIM2_CH4***), AF1 (USART2_RX)
         [5]  = { .funcs = 0b00000101, .AF = {_S(0)}}, // PA5: ADC5, AF9 (SPI1_SCK)
-        [6]  = { .funcs = 0b00000101, .AF = {_S(0)}}, // PA6: ADC6, AF0 (SPI1_MISO)
-        [7]  = { .funcs = 0b00000101, .AF = {_S(0)}}, // PA7: ADC7, AF0 (SPI1_MOSI)
-        [9]  = { .funcs = 0b00000010, .AF = {_U(1)}}, // PA9: AF1 (USART1_TX)
-        [10] = { .funcs = 0b00000010, .AF = {_U(1)}}, // PA10: AF1 (USART1_RX)
+        [6]  = { .funcs = 0b00010101, .AF = {_S(0), _P(5)}}, // PA6: ADC6, AF0 (SPI1_MISO), AF5 (TIM16_CH1)
+        [7]  = { .funcs = 0b00010101, .AF = {_S(0), _P(4)}}, // PA7: ADC7, AF0 (SPI1_MOSI), AF4 (TIM14_CH1)
+        [9]  = { .funcs = 0b00010010, .AF = {_U(1), _P(2)}}, // PA9: AF1 (USART1_TX), AF2 (TIM1_CH2)
+        [10] = { .funcs = 0b00010010, .AF = {_U(1), _P(2)}}, // PA10: AF1 (USART1_RX), AF2 (TIM1_CH3)
     },
     [1] = { // PORT B
-        [0]  = { .funcs = 0b00000001, .AF = {0}}, // PB0: ADC8, AF1 (TIM3_CH3), AF2 (TIM1_CH2N)
-        [1]  = { .funcs = 0b00000001, .AF = {0}}, // PB1: ADC9, AF0 (TIM14_CH1), AF1 (TIM3_CH4), AF2 (TIM1_CH3N)
+        [0]  = { .funcs = 0b00010001, .AF = {_P(1)}}, // PB0: ADC8, AF1 (TIM3_CH3)
+        [1]  = { .funcs = 0b00010001, .AF = {_P(1)}}, // PB1: ADC9, AF1 (TIM3_CH4)
         [2]  = { .funcs = 0b00000000, .AF = {0}}, // PB2: nothing except GPIO
-        [3]  = { .funcs = 0b00000100, .AF = {_S(0)}}, // PB3: AF0, (SPI1_SCK), AF2 (TIM2_CH2)
-        [4]  = { .funcs = 0b00000100, .AF = {_S(0)}}, // PB4: AF0 (SPI1_MISO), AF1 (TIM3_CH1)
-        [5]  = { .funcs = 0b00000100, .AF = {_S(0)}}, // PB5: AF0 (SPI1_MOSI), AF1 (TIM3_CH2)
-        [6]  = { .funcs = 0b00001010, .AF = {_U(0), _I(1)}}, // PB6: AF0 (USART1_TX), AF1 (I2C1_SCL), AF2 (TIM16_CH1N)
-        [7]  = { .funcs = 0b00001010, .AF = {_U(0), _I(1)}}, // PB7: AF0 (USART1_RX), AF1 (I2C1_SDA), AF2 (TIM17_CH1N)
-        [10] = { .funcs = 0b00001000, .AF = {_I(1)}}, // PB10: AF1 (I2C1_SCL), AF2 (TIM2_CH3)
-        [11] = { .funcs = 0b00001000, .AF = {_I(1)}}, // PB11: AF1 (I2C1_SDA), AF2 (TIM2_CH4)
+        [3]  = { .funcs = 0b00010100, .AF = {_S(0), _P(2)}}, // PB3: AF0, (SPI1_SCK), AF2 (TIM2_CH2*)
+        [4]  = { .funcs = 0b00010100, .AF = {_S(0), _P(1)}}, // PB4: AF0 (SPI1_MISO), AF1 (TIM3_CH1)
+        [5]  = { .funcs = 0b00010100, .AF = {_S(0), _P(1)}}, // PB5: AF0 (SPI1_MOSI), AF1 (TIM3_CH2)
+        [6]  = { .funcs = 0b00001010, .AF = {_U(0), _I(1)}}, // PB6: AF0 (USART1_TX), AF1 (I2C1_SCL)
+        [7]  = { .funcs = 0b00001010, .AF = {_U(0), _I(1)}}, // PB7: AF0 (USART1_RX), AF1 (I2C1_SDA)
+        [10] = { .funcs = 0b00011000, .AF = {_I(1), _P(2)}}, // PB10: AF1 (I2C1_SCL), AF2 (TIM2_CH3**)
+        [11] = { .funcs = 0b00011000, .AF = {_I(1), _P(2)}}, // PB11: AF1 (I2C1_SDA), AF2 (TIM2_CH4***)
     }
 };
 #undef _U
 #undef _S
 #undef _I
 
+#if 0
+PWM (start - collisions):
+PxN XY (XY: TIMX_CHY)
+PA1  22 *
+PA2  23 **
+PA3  24 ***
+PA6  161
+PA7  141
+PA9  12
+PA10 13
+PB0  33
+PB1  34
+PB3  22 *
+PB4  31
+PB5  32
+PB10 23 **
+PB11 24 ***
+-> need to set up timers / channels
+TIM1 / 2 3
+TIM2 / 2 3 4
+TIM3 / 1 2 3 4
+TIM14 / 1
+TIM16 / 1
+#endif
+
+#define PT(t, ch)               {.tim = t, .chidx = ch}
+#define PTC(t, ch, P, p)     {.tim = t, .chidx = ch, .collision = 1, .collport = P, .collpin = p}
+static const pwmtimer_t timer_map[2][16] = {
+    [0] = {
+        [1]  = PTC(TIM2, 1, 1, 3),
+        [2]  = PTC(TIM2, 2, 1, 10),
+        [3]  = PTC(TIM2, 3, 1, 11),
+        [6]  = PT(TIM16, 0),
+        [7]  = PT(TIM14, 0),
+        [9]  = PT(TIM1, 1),
+        [10] = PT(TIM1, 2)
+    },
+    [1] = {
+        [0]  = PT(TIM3, 2),
+        [1]  = PT(TIM3, 3),
+        [3]  = PTC(TIM2, 1, 0, 1),
+        [4]  = PT(TIM3, 0),
+        [5]  = PT(TIM3, 1),
+        [10] = PTC(TIM2, 2, 0, 2),
+        [11] = PTC(TIM2, 3, 0, 3)
+    }
+};
+#undef PT
+#undef PTC
 
 typedef struct{
     uint8_t isrx : 1;
@@ -434,3 +486,17 @@ uint16_t gpio_alert(uint8_t port){
     }
     return alert;
 }
+
+/**
+ * @brief canPWM - check if pin have PWM ability
+ * @param port - port (0/1 for GPIOA/GPIOB)
+ * @param pin - pin (0..15)
+ * @param t (o) - struct for pin's PWM timer
+ * @return TRUE if can, FALSE if no
+ */
+int canPWM(uint8_t port, uint8_t pin, pwmtimer_t *t){
+    if(port > 1 || pin > 15) return 0;
+    if(t) *t = timer_map[port][pin];
+    if(timer_map[port][pin].tim) return TRUE;
+    return FALSE;
+}
diff --git a/F0:F030,F042,F072/usbcan_gpio/gpio.h b/F0:F030,F042,F072/usbcan_gpio/gpio.h
index 4d5992d..826471e 100644
--- a/F0:F030,F042,F072/usbcan_gpio/gpio.h
+++ b/F0:F030,F042,F072/usbcan_gpio/gpio.h
@@ -19,6 +19,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <stm32f0.h>
 
 #ifdef EBUG
 #define USBIF   IGPIO
@@ -90,6 +91,15 @@ typedef struct{
     uint16_t threshold;  // threshold for ADC measurement
 } pinconfig_t;
 
+// Timers for PWM
+typedef struct{
+    volatile TIM_TypeDef *tim;  // timer
+    uint8_t chidx : 2;          // channel index (0..3)
+    uint8_t collision : 1;      // have collision with other channel (1)
+    uint8_t collport : 1;       // collision port index (0 - GPIOA, 1 - GPIOB)
+    uint8_t collpin : 4;        // collision pin index (0..15)
+} pwmtimer_t;
+
 /*
 typedef struct{
     uint32_t speed;
@@ -111,3 +121,5 @@ int gpio_reinit();
 int pin_out(uint8_t port, uint8_t pin, uint8_t newval);
 int16_t pin_in(uint8_t port, uint8_t pin);
 uint16_t gpio_alert(uint8_t port);
+
+int canPWM(uint8_t port, uint8_t pin, pwmtimer_t *t);
diff --git a/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp b/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp
index 3b52601..9cde6ca 100644
--- a/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp
+++ b/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp
@@ -54,7 +54,8 @@ static uint8_t hex_input_mode = 0; // ==0 for text input, 1 for HEX + text in qu
     COMMAND(mcureset,   "reset MCU") \
     COMMAND(PA,         "GPIOA setter/getter (type PA0=help for further info)") \
     COMMAND(PB,         "GPIOB setter/getter") \
-    COMMAND(readconf,  "re-read config from flash") \
+    COMMAND(pwmmap,     "show pins with PWM ability") \
+    COMMAND(readconf,   "re-read config from flash") \
     COMMAND(reinit,     "apply pin config") \
     COMMAND(saveconf,   "save current user configuration into flash") \
     COMMAND(sendcan,    "send all after '=' to CAN USB interface") \
@@ -679,7 +680,7 @@ static errcodes_t cmd_help(const char _U_ *cmd, char _U_ *args){
     return ERR_AMOUNT;
 }
 
-static errcodes_t cmd_hexinput(const char *cmd, char *args) {
+static errcodes_t cmd_hexinput(const char *cmd, char *args){
     int32_t val;
     if(argsvals(args, NULL, &val)){
         if(val == 0 || val == 1) hex_input_mode = (uint8_t)val;
@@ -690,6 +691,25 @@ static errcodes_t cmd_hexinput(const char *cmd, char *args) {
     return ERR_AMOUNT;
 }
 
+static errcodes_t cmd_pwmmap(const char _U_ *cmd, char _U_ *args){
+    pwmtimer_t t;
+    SEND("PWM pins:\n");
+    for(int port = 0; port < 2; ++port){
+        for(int pin = 0; pin < 16; ++pin){
+            if(!canPWM(port, pin, &t)) continue;
+            SEND((port == 0) ? "PA" : "PB");
+            SEND(u2str(pin));
+            if(t.collision){
+                SEND(" conflicts with ");
+                SEND((t.collport == 0) ? "PA" : "PB");
+                SEND(u2str(t.collpin));
+            }
+            NL();
+        }
+    }
+    return ERR_AMOUNT;
+}
+
 static int sendfun(const char *s){
     if(!s) return 0;
     return USB_sendstr(IGPIO, s);
diff --git a/F0:F030,F042,F072/usbcan_gpio/pwm.c b/F0:F030,F042,F072/usbcan_gpio/pwm.c
new file mode 100644
index 0000000..4e45470
--- /dev/null
+++ b/F0:F030,F042,F072/usbcan_gpio/pwm.c
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the usbcangpio project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "pwm.h"
+
+/*
+ * initial setup of all available PWM timers / channels:
+ * TIM1 / 2 3
+ * TIM2 / 2 3 4
+ * TIM3 / 1 2 3 4
+ * TIM14 / 1
+ * TIM16 / 1
+ */
+
+void pwm_setup(){
+    ;
+}
diff --git a/F0:F030,F042,F072/usbcan_gpio/pwm.h b/F0:F030,F042,F072/usbcan_gpio/pwm.h
new file mode 100644
index 0000000..1a04315
--- /dev/null
+++ b/F0:F030,F042,F072/usbcan_gpio/pwm.h
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the usbcangpio project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+void pwm_setup();
diff --git a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.bin b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.bin
index f5500feebd1801f6a4372ac85faffd9cb6ff57c5..25457cc09da79fa5c0b9657bc89d1fda25f8d4ff 100755
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diff --git a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user
index aa40037..765e6fb 100644
--- a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user
+++ b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 18.0.2, 2026-03-14T01:13:52. -->
+<!-- Written by QtCreator 18.0.2, 2026-03-15T02:24:04. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
diff --git a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.files b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.files
index 1df8100..7e44667 100644
--- a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.files
+++ b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.files
@@ -16,6 +16,8 @@ hashgen/Readme
 hashgen/hashgen.c
 hashgen/mktestdic
 main.c
+pwm.c
+pwm.h
 ringbuffer.c
 ringbuffer.h
 strfunc.c
diff --git a/F0:F030,F042,F072/usbcan_gpio/version.inc b/F0:F030,F042,F072/usbcan_gpio/version.inc
index 4d56d69..951c9c1 100644
--- a/F0:F030,F042,F072/usbcan_gpio/version.inc
+++ b/F0:F030,F042,F072/usbcan_gpio/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "190"
-#define BUILD_DATE "2026-03-14"
+#define BUILD_NUMBER "192"
+#define BUILD_DATE "2026-03-15"