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fixed some errors; renew readme

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This commit is contained in:
Edward Emelianov
2026-10-01 16:23:50 +03:00
parent 8200366090
commit a2cb827a76
12 changed files with 472 additions and 296 deletions
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10
F1:F103/FX3U/modbusrtu.c
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@@ -47,7 +47,7 @@ static void us(){
static volatile int modbus_txrdy = 1;
static volatile int modbus_rdy = 0 // received data ready
,dlen = 0 // length of data (including '\n') in current buffer
,dlen = 0 // length of data in current buffer
,bufovr = 0 // input buffer overfull
;
@@ -83,6 +83,7 @@ static uint16_t getCRC(uint8_t *data, int l){
*/
int modbus_receive(uint8_t **packet){
if(!modbus_rdy) return 0;
if(dlen < 4) return -1; // broken packet
if(bufovr){
DBG("Modbus buffer overflow\n");
bufovr = 0;
@@ -112,9 +113,9 @@ static int senddata(int l){
DMA2_Channel5->CCR &= ~DMA_CCR_EN;
DMA2_Channel5->CMAR = (uint32_t) tbuf[tbufno]; // mem
DMA2_Channel5->CNDTR = l + 2; // + CRC
_485_Tx();
DMA2_Channel5->CCR |= DMA_CCR_EN;
tbufno = !tbufno;
_485_Tx();
return l;
}
@@ -139,7 +140,7 @@ int modbus_send_request(modbus_request *r){
*curbuf++ = (uint8_t) r->regno; // L
// if r->datalen == 0 - this is responce for request with fcode > 4
if((r->Fcode == MC_WRITE_MUL_COILS || r->Fcode == MC_WRITE_MUL_REGS) && r->datalen){ // request with data
if(r->datalen > MODBUSBUFSZO - 7) return -1;
if(r->datalen > MODBUSBUFSZO - 9) return -1; // 6 previous + 1 for datalen + 2 for CRC
*curbuf++ = r->datalen;
memcpy(curbuf, r->data, r->datalen);
n += r->datalen + 1; // + data length byte
@@ -164,7 +165,7 @@ int modbus_get_request(modbus_request* r){
if(l > 6){ // request with data
if(r->Fcode != MC_WRITE_MUL_COILS && r->Fcode != MC_WRITE_MUL_REGS) return -1; // bad request
r->datalen = pack[4];
if(r->datalen > l-6) r->datalen = l-6; // fix if data bytes less than field
if(r->datalen > l - 7) r->datalen = l - 7; // fix if data bytes less than field
r->data = pack + 5;
}else{
r->datalen = 0;
@@ -227,6 +228,7 @@ void modbus_setup(uint32_t speed){
NVIC_SetPriority(DMA2_Channel3_IRQn, 2);
NVIC_EnableIRQ(DMA2_Channel3_IRQn);
// setup uart4
if(speed < 1200) speed = 1200;
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
uint32_t tmout = 16000000;