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fixed i2c (internal pullup + right scan method)

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This commit is contained in:
Edward Emelianov 2023-01-10 23:45:27 +03:00
parent f88e9ec4df
commit ed5a19f8bb
4 changed files with 17 additions and 16 deletions
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5
G0:G070/i2c/Makefile
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@ -68,8 +68,7 @@ CFLAGS += -fno-common -ffunction-sections -fdata-sections
###############################################################################
# Linker flags
LDFLAGS += --static -nostartfiles
#--specs=nano.specs
LDFLAGS += --static -nostartfiles --specs=nano.specs
LDFLAGS += -L$(LIB_DIR)
LDFLAGS += -T$(LDSCRIPT)
LDFLAGS += -Wl,-Map=$(OBJDIR)/$(BINARY).map
@ -146,7 +145,7 @@ clean:
@rmdir $(OBJDIR) 2>/dev/null || true
size: $(ELF)
$(SIZE) $(ELF)
$(SIZE) -Ax $(ELF)
flash: $(BIN)
@echo " FLASH $(BIN)"

11
G0:G070/i2c/i2c.c
View File

@ -59,6 +59,8 @@ void i2c_setup(I2C_SPEED speed){
6 << (6 * 4) | 6 << (7 * 4);
GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODE6 | GPIO_MODER_MODE7)) |
GPIO_MODER_MODER6_AF | GPIO_MODER_MODER7_AF;
GPIOB->PUPDR = (GPIOB->PUPDR & !(GPIO_PUPDR_PUPD6 | GPIO_PUPDR_PUPD7)) |
GPIO_PUPDR6_PU | GPIO_PUPDR7_PU; // pullup
GPIOB->OTYPER |= GPIO_OTYPER_OT6 | GPIO_OTYPER_OT7; // both open-drain outputs
// I2C (default timing from PCLK - 64MHz)
RCC->APBENR1 |= RCC_APBENR1_I2C1EN; // clocking
@ -142,7 +144,7 @@ static uint8_t write_i2cs(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t s
return 0;
}
if(Tms - cntr > I2C_TIMEOUT){
USND("Timeout\n");
//USND("Timeout\n");
return 0;
}
}
@ -198,11 +200,11 @@ static uint8_t read_i2cb(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t bu
IWDG->KR = IWDG_REFRESH;
if(I2C1->ISR & I2C_ISR_NACKF){
I2C1->ICR |= I2C_ICR_NACKCF;
USND("NAK\n");
//USND("NAK\n");
return 0;
}
if(Tms - cntr > I2C_TIMEOUT){
USND("Timeout\n");
//USND("Timeout\n");
return 0;
}
}
@ -261,7 +263,8 @@ int i2c_scan_next_addr(uint8_t *addr){
/*while(!u3txrdy);
USND("Addr: "); USND(uhex2str(i2caddr)); USND("\n");
usart3_sendbuf();*/
if(!read_i2c_reg((i2caddr++)<<1, 0, NULL, 0)) return 0;
uint8_t byte;
if(!read_i2c((i2caddr++)<<1, &byte, 1)) return 0;
return 1;
}

BIN
G0:G070/i2c/i2cscan.bin
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Binary file not shown.

15
G0:G070/i2c/usart.c
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@ -27,17 +27,17 @@
#define DMATXCCR (DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE | DMA_CCR_TEIE)
volatile int u3txrdy = 1, u3rxrdy = 0; // transmission done, next line received
static int bufovr = 0, wasbufovr = 0; // Rx buffer overflow or error flag -> delete next line
static int rbufno = 0, tbufno = 0; // current buf number
static char rbuf[2][UARTBUFSZ], tbuf[2][UARTBUFSZ]; // receive & transmit buffers
static int rxlen[2] = {0}, txlen[2] = {0};
static volatile int bufovr = 0, wasbufovr = 0; // Rx buffer overflow or error flag -> delete next line
static volatile int rbufno = 0, tbufno = 0; // current buf number
static volatile char rbuf[2][UARTBUFSZ], tbuf[2][UARTBUFSZ]; // receive & transmit buffers
static volatile int rxlen[2] = {0}, txlen[2] = {0};
char *usart3_getline(int *wasbo){
if(wasbo) *wasbo = wasbufovr;
wasbufovr = 0;
if(!u3rxrdy) return NULL;
u3rxrdy = 0; // clear ready flag
return rbuf[!rbufno]; // current buffer is in filling stage, return old - filled - buffer
return (char*)rbuf[!rbufno]; // current buffer is in filling stage, return old - filled - buffer
}
#define USART_BRR(speed) ((64000000 + speed/2) / speed)
@ -84,7 +84,7 @@ int usart3_send(const char *str, int len){
int rest = UARTBUFSZ - txlen[tbufno];
if(rest == 0 && !u3txrdy) return 0; // buffer is full while transmission in process
if(len < rest) rest = len;
mymemcpy(tbuf[tbufno] + txlen[tbufno], str, rest);
mymemcpy((char*)(tbuf[tbufno] + txlen[tbufno]), str, rest);
txlen[tbufno] += rest;
if(!u3txrdy) return rest;
if(txlen[tbufno] == UARTBUFSZ) usart3_sendbuf();
@ -92,7 +92,7 @@ int usart3_send(const char *str, int len){
len -= rest;
// now fill another - empty - buffer
if(len > UARTBUFSZ) len = UARTBUFSZ;
mymemcpy(tbuf[tbufno], str + rest, len);
mymemcpy((char*)tbuf[tbufno], str + rest, len);
txlen[tbufno] = len;
return rest + len;
}
@ -157,7 +157,6 @@ void dma1_channel2_3_isr(){
uint32_t isr = DMA1->ISR;
if(isr & (DMA_ISR_TCIF2 | DMA_ISR_TEIF2)){ // transfer complete or error
u3txrdy = 1;
//DMA1_Channel2->CCR = DMATXCCR;
}
if(isr & (DMA_ISR_TCIF3 | DMA_ISR_TEIF3)){ // receive complete or error -> buffer overflow
if(rbuf[rbufno][UARTBUFSZ-1] != '\n'){ // last symbol is not a newline