eddy/stm32samples
1
0
Fork 0
mirror of https://github.com/eddyem/stm32samples.git synced 2026-03-21 17:21:04 +03:00
Code Issues Packages Projects Releases Wiki Activity

I2C works

Browse Source
This commit is contained in:
Edward Emelianov
2026-03-17 21:17:45 +03:00
parent 03b05051aa
commit 165780bef9
11 changed files with 558 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

108
F0:F030,F042,F072/usbcan_gpio/gpio.c
View File

@@ -22,6 +22,7 @@
#include "adc.h"
#include "flash.h"
#include "gpio.h"
#include "i2c.h"
#include "pwm.h"
#include "usart.h"
@@ -39,12 +40,6 @@ typedef struct{
uint8_t AF[FUNC_AMOUNT]; // alternate function number for corresponding `FuncNames` number
} pinprops_t;
#define CANADC(x) ((x) & (1<<FUNC_AIN))
#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
@@ -81,17 +76,28 @@ static const pinprops_t pin_props[2][16] = {
#undef _S
#undef _I
typedef struct{
uint8_t isrx : 1;
uint8_t istx : 1;
} usart_props_t;
#define CANADC(x) ((x) & (1<<FUNC_AIN))
#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))
static uint8_t haveI2C = 0; // ==1 if chkpinconf found I2C
// return pin_props[port][pin].funcs for listing or -1 if disabled
int pinfuncs(uint8_t port, uint8_t pin){
if(is_disabled(port, pin)) return -1;
return (int) pin_props[port][pin].funcs;
}
/**
* @brief get_usart_index - get USART index (0 or 1 for USART1 or USART2) by given pin
* @param port
* @param pin
* @return -1 if error
*/
static int get_usart_index(uint8_t port, uint8_t pin, usart_props_t *p){
int get_usart_index(uint8_t port, uint8_t pin, usart_props_t *p){
if(port > 1 || pin > 15 || !CANUSART(pin_props[port][pin].funcs)) return -1;
int idx = -1;
usart_props_t curprops = {0};
if(port == 0){ // GPIOA
@@ -133,6 +139,37 @@ static int get_usart_index(uint8_t port, uint8_t pin, usart_props_t *p){
return idx;
}
// return -1 if pin can't I2C, or return 0 and fill `p`
int get_i2c_index(uint8_t port, uint8_t pin, i2c_props_t *p){
if(port > 1 || pin > 15 || !CANI2C(pin_props[port][pin].funcs)) return -1;
int idx = -1; // I2C1 is alone
i2c_props_t curprops = {0};
if(port == 1){ // only GPIOB
switch(pin){
case 6: // PB6 - I2C1_SCL
idx = 0;
curprops.isscl = 1;
break;
case 7: // PB7 - I2C1_SDA
idx = 0;
curprops.issda = 1;
break;
case 10: // PB10 - I2C1_SCL
idx = 0;
curprops.isscl = 1;
break;
case 11: // PB11 - I2C1_SDA
idx = 0;
curprops.issda = 1;
break;
default:
break;
}
}
if(p) *p = curprops;
return idx;
}
// default config
static void defconfig(pinconfig_t *cfg){
if(!cfg) return;
@@ -158,6 +195,8 @@ int chkpinconf(){
UC.RXen = 0; UC.TXen = 0; UC.monitor = 0;
}
int active_usart = -1; // number of USART if user selects it (we can't check it by UC->idx)
int active_i2c = -1;
uint8_t i2c_scl_pin = 0xFF, i2c_sda_pin = 0xFF; // to check SCL/SDA collisions and (SCL&SDA)
for(int port = 0; port < 2; ++port){
for(int pin = 0; pin < 16; ++pin){
pinconfig_t *cfg = &pinconfig[port][pin];
@@ -210,6 +249,41 @@ int chkpinconf(){
break;
}
}
break;
case FUNC_I2C:{
i2c_props_t ip;
int i2c_idx = get_i2c_index(port, pin, &ip);
if(i2c_idx < 0){
defconfig(cfg);
ret = FALSE;
break;
}
// maybe for 2 I2Cs
if(active_i2c == -1) active_i2c = i2c_idx;
else if(active_i2c != i2c_idx){
// collision
defconfig(cfg);
ret = FALSE;
break;
}
if(ip.isscl){
if(i2c_scl_pin != 0xFF){ // two SCLs
defconfig(cfg);
ret = FALSE;
break;
}
i2c_scl_pin = (port << 4) | pin;
}
if(ip.issda){
if(i2c_sda_pin != 0xFF){ // two SDAs
defconfig(cfg);
ret = FALSE;
break;
}
i2c_sda_pin = (port << 4) | pin;
}
}
break;
default: break; // later fill other functions
}
}
@@ -226,11 +300,19 @@ int chkpinconf(){
get_defusartconf(&UC); // clear global configuration
the_conf.usartconfig = UC;
}
// check active I2C
if(active_i2c != -1){
if(i2c_scl_pin == 0xFF || i2c_sda_pin == 0xFF){
DBG("Need two pins for I2C\n");
ret = FALSE;
haveI2C = 0;
}else haveI2C = 1;
}else i2c_stop();
return ret;
}
int is_disabled(uint8_t port, uint8_t pin){
if(port > 1 || pin > 15) return FALSE;
if(port > 1 || pin > 15) return TRUE;
if(the_conf.pinconfig[port][pin].enable) return FALSE;
return TRUE;
}
@@ -371,6 +453,8 @@ int gpio_reinit(){
if(!usart_config(NULL)) ret = FALSE;
else if(!usart_start()) ret = FALSE;
}else usart_stop();
if(haveI2C) i2c_setup((i2c_speed_t) the_conf.I2Cspeed);
else i2c_stop();
return ret;
}