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Add DMA to I2C reading/writing

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This commit is contained in:
Edward Emelianov
2023-01-08 18:37:08 +03:00
parent dd8d567464
commit c76d7aacb0
10 changed files with 251 additions and 101 deletions
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53
G0:G070/i2c/proto.c
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@@ -28,10 +28,13 @@ static uint8_t locBuffer[LOCBUFFSZ];
const char *helpstring =
"i0..2 - setup I2C with lowest..highest speed (7.7, 10 and 100kHz)\n"
"Ia addr - set I2C address\n"
"Ig - dump content of I2Cbuf\n"
"Iw bytes - send bytes (hex/dec/oct/bin) to I2C\n"
"IW bytes - the same over DMA\n"
"Ir reg n - read n bytes from I2C reg\n"
"IR reg16 n - read n bytes from 16-bit register\n"
"I2 reg16 n - read n bytes from 16-bit register\n"
"In n - just read n bytes\n"
"IN n - the same but with DMA\n"
"Is - scan I2C bus\n"
"U - send long buffer over USART\n"
;
@@ -47,7 +50,7 @@ static void U3sendlong(const char *str){
}
static uint8_t i2cinited = 0;
static inline char *setupI2C(char *buf){
TRUE_INLINE char *setupI2C(char *buf){
buf = omit_spaces(buf);
if(*buf < '0' || *buf > '2') return "Wrong speed";
i2c_setup(*buf - '0');
@@ -56,27 +59,30 @@ static inline char *setupI2C(char *buf){
}
static uint8_t I2Caddress = 0;
static inline char *saI2C(char *buf){
TRUE_INLINE char *saI2C(char *buf){
uint32_t addr;
if(!getnum(buf, &addr) || addr > 0x7f) return "Wrong address";
I2Caddress = (uint8_t) addr << 1;
USND("I2Caddr="); USND(uhex2str(addr)); USND("\n");
return "OK";
}
static inline void rdI2C(char *buf, int is16){
static void rdI2C(char *buf, int is16){
uint32_t N;
int noreg = 0;
int noreg = 0; // write register (==1 - just read, ==2 - -//- using DMA)
char *nxt = NULL;
if(*buf != 'n'){
if(*buf == 'n'){
++buf;
noreg = 1;
}else if(*buf == 'N'){
++buf;
noreg = 2;
}else{
nxt = getnum(buf, &N);
if(!nxt || buf == nxt || N > 0xffff || (!is16 && N > 0xff)){
USND("Bad register number\n");
return;
}
buf = nxt;
}else{
++buf;
noreg = 1;
}
uint16_t reg = N;
nxt = getnum(buf, &N);
@@ -86,8 +92,16 @@ static inline void rdI2C(char *buf, int is16){
}
const char *erd = "Error reading I2C\n";
if(noreg){ // don't write register
if(!read_i2c(I2Caddress, locBuffer, N)){
USND(erd);
if(noreg == 1){
USND("Simple read:\n");
if(!read_i2c(I2Caddress, locBuffer, N)){
USND(erd);
return;
}
}else{
USND("Try to read using DMA .. ");
if(!read_i2c_dma(I2Caddress, N)) USND(erd);
else USND("OK\n");
return;
}
}else{
@@ -104,11 +118,11 @@ static inline void rdI2C(char *buf, int is16){
}
}
if(N == 0){ USND("OK"); return; }
USND("Register "); USND(uhex2str(reg)); USND(":\n");
if(!noreg){USND("Register "); USND(uhex2str(reg)); USND(":\n");}
hexdump(usart3_sendstr, locBuffer, N);
}
// read N numbers from buf, @return 0 if wrong or none
static uint16_t readNnumbers(char *buf){
TRUE_INLINE uint16_t readNnumbers(char *buf){
uint32_t D;
char *nxt;
uint16_t N = 0;
@@ -120,9 +134,11 @@ static uint16_t readNnumbers(char *buf){
USND("Send "); USND(u2str(N)); USND(" bytes\n");
return N;
}
static inline char *wrI2C(char *buf){
static char *wrI2C(char *buf, int isdma){
uint16_t N = readNnumbers(buf);
if(!write_i2c(I2Caddress, locBuffer, N)) return "Error writing I2C";
int result = isdma ? write_i2c_dma(I2Caddress, locBuffer, N) :
write_i2c(I2Caddress, locBuffer, N);
if(!result) return "Error writing I2C";
return "OK";
}
@@ -138,10 +154,13 @@ char *parse_cmd(char *buf){
buf = omit_spaces(buf + 1);
if(*buf == 'a') return saI2C(buf + 1);
else if(*buf == 'r'){ rdI2C(buf + 1, 0); return NULL; }
else if(*buf == 'R'){ rdI2C(buf + 1, 1); return NULL; }
else if(*buf == '2'){ rdI2C(buf + 1, 1); return NULL; }
else if(*buf == 'n'){ rdI2C(buf, 0); return NULL; }
else if(*buf == 'w') return wrI2C(buf + 1);
else if(*buf == 'N'){ rdI2C(buf, 0); return NULL; }
else if(*buf == 'w') return wrI2C(buf + 1, 0);
else if(*buf == 'W') return wrI2C(buf + 1, 1);
else if(*buf == 's'){ i2c_init_scan_mode(); return "Start scan\n"; }
else if(*buf == 'g'){ i2c_bufdudump(); return NULL; }
else return "Command should be 'Ia', 'Iw', 'Ir' or 'Is'\n";
break;
}