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add modbus RTU

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This commit is contained in:
Edward Emelianov 2024-09-24 18:13:23 +03:00
parent 22a205001a
commit 03772fce3a
9 changed files with 83 additions and 26 deletions
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1
F1:F103/FX3U/can.c
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@ -122,6 +122,7 @@ void CAN_setup(uint32_t speed){
uint32_t tmout = 16000000;
// Configure GPIO: PD0 - CAN_Rx, PD1 - CAN_Tx
AFIO->MAPR |= AFIO_MAPR_CAN_REMAP_REMAP3;
AFIO->MAPR |= AFIO_MAPR_SWJ_CFG_DISABLE; // I don't know why, but without this string JTAG works (despite on turning it off in hardware.c)!
GPIOD->CRL = (GPIOD->CRL & ~(CRL(0,0xf)|CRL(1,0xf))) |
CRL(0, CNF_FLINPUT | MODE_INPUT) | CRL(1, CNF_AFPP | MODE_NORMAL);
/* Enable the peripheral clock CAN */

1
F1:F103/FX3U/canproto.c
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@ -163,6 +163,7 @@ static errcodes u32setget(CAN_message *msg){
case CMD_INCHNLS: val = inchannels(); ptr = &val; break;
case CMD_OUTCHNLS: val = outchannels(); ptr = &val; break;
case CMD_MODBUSID: ptr = &the_conf.modbusID; break;
case CMD_MODBUSSPEED: ptr = &the_conf.modbusspeed; break;
default: break;
}
if(!ptr) return ERR_CANTRUN; // unknown error

BIN
F1:F103/FX3U/fx3u.bin
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Binary file not shown.

39
F1:F103/FX3U/hardware.c
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@ -69,7 +69,9 @@ Xn - inputs, Yn - outputs, ADCn - ADC inputs
| 67 | PA8 | Y2 | PPOUT | |
| 68 | PA9 | RS TX | AFPP | |
| 69 | PA10 | RS RX | FLIN | |
| 76 | PA14/SWCLK | 485 DE * | (default) | (Not now) RS-485 Data Enable |
| 76 | PA14/SWCLK | 485 DE | PPOUT | RS-485 Data Tx Enable |
| 78 | PC10 | 485 TX | AFPP | RS-485 Tx |
| 79 | PC11 | 485 RX | FLIN | RS-485 Rx |
| 81 | PD0 | CAN RX | FLIN | |
| 82 | PD1 | CAN TX | AFPP | |
| 89 | PB3/JTDO | Y4 | PPOUT | |
@ -82,27 +84,32 @@ void gpio_setup(void){
// PD0 & PD1 (CAN) setup in can.c; PA9 & PA10 (USART) in usart.c
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN |
RCC_APB2ENR_IOPEEN | RCC_APB2ENR_AFIOEN;
// Turn off JTAG
AFIO->MAPR = AFIO_MAPR_SWJ_CFG_JTAGDISABLE;
GPIOA->CRL = CRL(0, CNF_PPOUTPUT|MODE_NORMAL) | CRL(1, CNF_ANALOG) | CRL(2, CNF_PPOUTPUT|MODE_NORMAL) |
CRL(3, CNF_ANALOG) | CRL(6, CNF_PPOUTPUT|MODE_NORMAL) | CRL(7, CNF_PPOUTPUT|MODE_NORMAL);
GPIOA->CRH = CRH(8, CNF_PPOUTPUT|MODE_NORMAL);
GPIOB->CRL = CRL(2, CNF_PUDINPUT) | CRL(3, CNF_PPOUTPUT|MODE_NORMAL);
GPIOB->CRH = CRH(10, CNF_PUDINPUT) | CRH(11, CNF_PUDINPUT) | CRH(12, CNF_PUDINPUT) | CRH(13, CNF_PUDINPUT) |
CRH(14, CNF_PUDINPUT) | CRH(15, CNF_PPOUTPUT|MODE_NORMAL);
GPIOC-> CRL = CRL(0, CNF_ANALOG) | CRL(1, CNF_ANALOG) | CRL(4, CNF_ANALOG) | CRL(5, CNF_ANALOG);
GPIOC->CRH = CRH(8, CNF_PPOUTPUT|MODE_NORMAL) | CRH(9, CNF_PPOUTPUT|MODE_NORMAL);
GPIOD->CRL = 0;
GPIOD->CRH = CRH(10, CNF_PPOUTPUT|MODE_NORMAL) | CRH(12, CNF_PPOUTPUT|MODE_NORMAL);
GPIOE->CRL = CRL(7, CNF_PUDINPUT);
GPIOE->CRH = CRH(8, CNF_PUDINPUT) | CRH(9, CNF_PUDINPUT) | CRH(10, CNF_PUDINPUT) | CRH(11, CNF_PUDINPUT) |
CRH(12, CNF_PUDINPUT) | CRH(13, CNF_PUDINPUT) | CRH(14, CNF_PUDINPUT) | CRH(15, CNF_PUDINPUT);
// Turn off JTAG/SWD to use PA14
AFIO->MAPR |= AFIO_MAPR_SWJ_CFG_DISABLE;
// be sure that all OK
// __ISB();
// __DSB();
// pullups & initial values
GPIOA->ODR = 0;
GPIOB->ODR = (1<<2) | (1<<10) | (1<<11) | (1<<12) | (1<<13) | (1<<14);
GPIOC->ODR = 0;
GPIOD->ODR = (1<<10); // turn off LED
GPIOE->ODR = (1<<7) | (1<<8) | (1<<9) | (1<<10) | (1<<11) | (1<<12) | (1<<13) | (1<<14) | (1<<15);
// configuration
GPIOA->CRL = CRL(0, CNF_PPOUTPUT|MODE_NORMAL) | CRL(1, CNF_ANALOG) | CRL(2, CNF_PPOUTPUT|MODE_NORMAL) |
CRL(3, CNF_ANALOG) | CRL(6, CNF_PPOUTPUT|MODE_NORMAL) | CRL(7, CNF_PPOUTPUT|MODE_NORMAL);
//GPIOA->CRH = CRH(8, CNF_PPOUTPUT|MODE_NORMAL) | CRH(14, CNF_PPOUTPUT|MODE_NORMAL);
GPIOA->CRH = CRH(8, CNF_PPOUTPUT|MODE_NORMAL) | CRH(14, CNF_ODOUTPUT|MODE_NORMAL);
GPIOB->CRL = CRL(2, CNF_PUDINPUT) | CRL(3, CNF_PPOUTPUT|MODE_NORMAL);
GPIOB->CRH = CRH(10, CNF_PUDINPUT) | CRH(11, CNF_PUDINPUT) | CRH(12, CNF_PUDINPUT) | CRH(13, CNF_PUDINPUT) |
CRH(14, CNF_PUDINPUT) | CRH(15, CNF_PPOUTPUT|MODE_NORMAL);
GPIOC->CRL = CRL(0, CNF_ANALOG) | CRL(1, CNF_ANALOG) | CRL(4, CNF_ANALOG) | CRL(5, CNF_ANALOG);
GPIOC->CRH = CRH(8, CNF_PPOUTPUT|MODE_NORMAL) | CRH(9, CNF_PPOUTPUT|MODE_NORMAL);
GPIOD->CRL = 0;
GPIOD->CRH = CRH(10, CNF_PPOUTPUT|MODE_NORMAL) | CRH(12, CNF_PPOUTPUT|MODE_NORMAL);
GPIOE->CRL = CRL(7, CNF_PUDINPUT);
GPIOE->CRH = CRH(8, CNF_PUDINPUT) | CRH(9, CNF_PUDINPUT) | CRH(10, CNF_PUDINPUT) | CRH(11, CNF_PUDINPUT) |
CRH(12, CNF_PUDINPUT) | CRH(13, CNF_PUDINPUT) | CRH(14, CNF_PUDINPUT) | CRH(15, CNF_PUDINPUT);
}

4
F1:F103/FX3U/hardware.h
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@ -41,6 +41,10 @@
#define LEDPORT GPIOD
#define LEDPIN (1<<10)
// RS-485 receive/transmit (PA14: 0-Rx, 1-Tx)
#define RS485_TX() pin_set(GPIOA, (1<<14))
#define RS485_RX() pin_clear(GPIOA, (1<<14))
extern volatile uint32_t Tms;
void gpio_setup(void);

10
F1:F103/FX3U/modbusproto.c
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@ -26,6 +26,7 @@
// send error
static void senderr(modbus_request *r, uint8_t exception){
if(r->ID == 0) return; // don't answer to broadcasting packets
modbus_response resp = {.ID = the_conf.modbusID, .Fcode = r->Fcode | MODBUS_RESPONSE_ERRMARK, .datalen = exception};
modbus_send_response(&resp);
}
@ -132,6 +133,7 @@ TRUE_INLINE void writecoil(modbus_request *r){
senderr(r, ME_ILLEGAL_ADDRESS);
return;
}
if(r->ID == 0) return;
modbus_send_request(r); // answer with same data
}
@ -147,6 +149,7 @@ TRUE_INLINE void writereg(modbus_request *r){
senderr(r, ME_ILLEGAL_ADDRESS);
return;
}
if(r->ID == 0) return;
modbus_send_request(r);
}
@ -171,6 +174,7 @@ TRUE_INLINE void writecoils(modbus_request *r){
senderr(r, ME_NACK);
return;
}
if(r->ID == 0) return;
r->datalen = 0;
modbus_send_request(r);
}
@ -190,6 +194,7 @@ TRUE_INLINE void writeregs(modbus_request *r){
senderr(r, ME_ILLEGAL_ADDRESS);
return;
}
if(r->ID == 0) return;
r->datalen = 0;
modbus_send_request(r);
}
@ -199,17 +204,22 @@ TRUE_INLINE void writeregs(modbus_request *r){
// Understand only requests with codes <= 6
void parse_modbus_request(modbus_request *r){
if(!r) return;
int bcast = (r->ID == 0) ? 1 : 0;
switch(r->Fcode){
case MC_READ_COIL:
if(bcast) break; // block broadcast reading requests
readcoil(r);
break;
case MC_READ_DISCRETE:
if(bcast) break;
readdiscr(r);
break;
case MC_READ_HOLDING_REG:
if(bcast) break;
readreg(r);
break;
case MC_READ_INPUT_REG:
if(bcast) break;
readadc(r);
break;
case MC_WRITE_COIL:

48
F1:F103/FX3U/modbusrtu.c
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@ -16,6 +16,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "hardware.h"
#include "modbusrtu.h"
#include "flash.h"
#include "strfunc.h"
@ -27,6 +28,20 @@
#include <stm32f1.h>
#include <string.h> // memcpy
/*
static void us(){
usart_send("MAPR="); printuhex(AFIO->MAPR);
usart_send("\nACRH="); printuhex(GPIOA->CRH);
usart_send("\nODR"); printuhex(GPIOA->ODR);
usart_send("\nIDR"); printuhex(GPIOA->IDR);
AFIO->MAPR |= AFIO_MAPR_SWJ_CFG_DISABLE;
newline();
}*/
// switch to Rx/Tx:
#define _485_Rx() do{LED(1); RS485_RX(); /*UART4->CR1 = (UART4->CR1 & ~USART_CR1_TE) | USART_CR1_RE;*/}while(0)
#define _485_Tx() do{LED(0); RS485_TX(); /*UART4->CR1 = (UART4->CR1 & ~USART_CR1_RE) | USART_CR1_TE;*/}while(0)
static volatile int modbus_txrdy = 1;
static volatile int idatalen[2] = {0,0}; // received data line length (including '\n')
@ -53,6 +68,9 @@ static uint16_t getCRC(uint8_t *data, int l){
}else crc >>= 1;
}
}
#ifdef EBUG
DBG("Calc CRC: "); printuhex(crc); newline();
#endif
// CRC have swapped bytes, so we can just send it as *((uint16_t*)&data[x]) = CRC
return crc;
}
@ -87,6 +105,7 @@ static int senddata(int l){
IWDG->KR = IWDG_REFRESH;
if(--tmout == 0) return 0;
}; // wait for previos buffer transmission
_485_Tx();
modbus_txrdy = 0;
DMA2_Channel5->CCR &= ~DMA_CCR_EN;
DMA2_Channel5->CMAR = (uint32_t) tbuf[tbufno]; // mem
@ -121,6 +140,7 @@ int modbus_send_request(modbus_request *r){
memcpy(curbuf, r->data, r->datalen);
n += r->datalen;
}
packCRC(tbuf[tbufno], n) = getCRC(tbuf[tbufno], n);
return senddata(n);
}
@ -161,6 +181,7 @@ int modbus_send_response(modbus_response *r){
if(len > MODBUSBUFSZO - 2) return -1; // too much data
memcpy(curbuf, r->data, r->datalen);
}
packCRC(tbuf[tbufno], len) = getCRC(tbuf[tbufno], len);
return senddata(len);
}
@ -187,11 +208,11 @@ int modbus_get_response(modbus_response* r){
// USART4: PC10 - Tx, PC11 - Rx
void modbus_setup(uint32_t speed){
uint32_t tmout = 16000000;
// PA9 - Tx, PA10 - Rx
// PC10 - Tx, PC11 - Rx
RCC->APB1ENR |= RCC_APB1ENR_UART4EN;
RCC->AHBENR |= RCC_AHBENR_DMA2EN;
GPIOA->CRH = (GPIOA->CRH & ~(CRH(9,0xf)|CRH(10,0xf))) |
CRH(9, CNF_AFPP|MODE_NORMAL) | CRH(10, CNF_FLINPUT|MODE_INPUT);
GPIOC->CRH = (GPIOC->CRH & ~(CRH(10,0xf)|CRH(11,0xf))) |
CRH(10, CNF_AFPP|MODE_NORMAL) | CRH(11, CNF_FLINPUT|MODE_INPUT);
// UART4 Tx DMA - Channel5 (Rx - channel 3)
DMA2_Channel5->CPAR = (uint32_t) &UART4->DR; // periph
DMA2_Channel5->CCR |= DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE; // 8bit, mem++, mem->per, transcompl irq
@ -202,15 +223,20 @@ void modbus_setup(uint32_t speed){
// setup uart4
UART4->BRR = 36000000 / speed; // APB1 is 36MHz
UART4->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE; // 1start,8data,nstop; enable Rx,Tx,USART
while(!(UART4->SR & USART_SR_TC)){if(--tmout == 0) break;} // polling idle frame Transmission
while(!(UART4->SR & USART_SR_TC)){ // polling idle frame Transmission
IWDG->KR = IWDG_REFRESH;
if(--tmout == 0) break;
}
UART4->SR = 0; // clear flags
UART4->CR1 |= USART_CR1_RXNEIE | USART_CR1_IDLEIE; // allow Rx and IDLE IRQ
UART4->CR1 |= USART_CR1_RXNEIE | USART_CR1_IDLEIE | USART_CR1_TCIE; // allow Rx and IDLE IRQ; TC IRQ for switching to Rx
UART4->CR3 = USART_CR3_DMAT; // enable DMA Tx
NVIC_EnableIRQ(UART4_IRQn);
_485_Rx();
}
void uart4_isr(){
if(UART4->SR & USART_SR_IDLE){ // idle - end of frame
usart_send("485: IDLE\n");
modbus_rdy = 1;
dlen = idatalen[rbufno];
recvdata = rbuf[rbufno];
@ -218,15 +244,22 @@ void uart4_isr(){
rbufno = !rbufno;
idatalen[rbufno] = 0;
(void) UART4->DR; // clear IDLE flag by reading DR
}
if(UART4->SR & USART_SR_RXNE){ // RX not emty - receive next char
}else if(UART4->SR & USART_SR_RXNE){ // RX not emty - receive next char
uint8_t rb = UART4->DR; // clear RXNE flag
if(idatalen[rbufno] < MODBUSBUFSZI){ // put next char into buf
rbuf[rbufno][idatalen[rbufno]++] = rb;
usart_send("485: "); usart_putchar(rb); newline();
}else{ // buffer overrun
bufovr = 1;
idatalen[rbufno] = 0;
}
}else if(UART4->SR & USART_SR_TC){
if(modbus_txrdy){
usart_send("->Rx\n");
_485_Rx();
}
usart_send("485: TC\n");
UART4->SR &= ~USART_SR_TC;
}
}
@ -236,3 +269,4 @@ void dma2_channel4_5_isr(){
modbus_txrdy = 1;
}
}

2
F1:F103/FX3U/usart.c
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@ -104,7 +104,7 @@ void usart_setup(uint32_t speed){
// PA9 - Tx, PA10 - Rx
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
RCC->AHBENR |= RCC_AHBENR_DMA1EN;
GPIOA->CRH = (GPIOA->CRH & ~(CRH(9,0xf)|CRH(10,0xf))) |
GPIOA->CRH = (GPIOA->CRH & ~(CRH(9, 0xf)|CRH(10, 0xf))) |
CRH(9, CNF_AFPP|MODE_NORMAL) | CRH(10, CNF_FLINPUT|MODE_INPUT);
// USART1 Tx DMA - Channel4 (Rx - channel 5)
DMA1_Channel4->CPAR = (uint32_t) &USART1->DR; // periph

4
F1:F103/FX3U/version.inc
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@ -1,2 +1,2 @@
#define BUILD_NUMBER "63"
#define BUILD_DATE "2024-09-19"
#define BUILD_NUMBER "85"
#define BUILD_DATE "2024-09-24"