Is there a way to not have to poll the UART of an AVR?Using the arduino toolchain as a convenent way to get...
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Is there a way to not have to poll the UART of an AVR?
Using the arduino toolchain as a convenent way to get GCC - Can you disable the code-munging?AVR USART Not ReceivingAVR external crystal not working with UARTPIC32 does not get UART RX interrupts in xc32 CompilerValid use of ISR_NOBLOCKAVR sending message via UARTBest way to connect to UART lines to multiple entitiesAVR UART synchronization problemAVR interrupt setup seems to stop program executionWhere MOSI is triggered low or high
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So I'm receiving data over UART from another AVR. However I'm doing other stuff so dont want to have constantly keep polling the UART. I know there are interrupts but i can only see one for receive complete. Which I assume still requires me to poll to the complete the transfer.
avr embedded
asked 7 hours ago
Adam MakinAdam Makin
604
$endgroup$
add a comment |
$begingroup$
So I'm receiving data over UART from another AVR. However I'm doing other stuff so dont want to have constantly keep polling the UART. I know there are interrupts but i can only see one for receive complete. Which I assume still requires me to poll to the complete the transfer.
avr embedded
asked 7 hours ago
Adam MakinAdam Makin
604
$endgroup$
1
$begingroup$
Why would you need to poll to initiate a transfer? Anyway, there are interrupts for transmission completion as well. I am not very into AVR, but these can be called "TX empty" or "FIFO empty" or FIFO threshold" or similar.
$endgroup$
– Eugene Sh.
7 hours ago
add a comment |
$begingroup$
So I'm receiving data over UART from another AVR. However I'm doing other stuff so dont want to have constantly keep polling the UART. I know there are interrupts but i can only see one for receive complete. Which I assume still requires me to poll to the complete the transfer.
avr embedded
asked 7 hours ago
Adam MakinAdam Makin
604
$endgroup$
So I'm receiving data over UART from another AVR. However I'm doing other stuff so dont want to have constantly keep polling the UART. I know there are interrupts but i can only see one for receive complete. Which I assume still requires me to poll to the complete the transfer.
avr embedded
avr embedded
asked 7 hours ago
Adam MakinAdam Makin
604
asked 7 hours ago
Adam MakinAdam Makin
604
edited 7 hours ago
Adam Makin
asked 7 hours ago
Adam MakinAdam Makin
604
asked 7 hours ago
Adam MakinAdam Makin
604
asked 7 hours ago
Adam MakinAdam Makin
604
604
1
$begingroup$
Why would you need to poll to initiate a transfer? Anyway, there are interrupts for transmission completion as well. I am not very into AVR, but these can be called "TX empty" or "FIFO empty" or FIFO threshold" or similar.
$endgroup$
– Eugene Sh.
7 hours ago
add a comment |
1
$begingroup$
Why would you need to poll to initiate a transfer? Anyway, there are interrupts for transmission completion as well. I am not very into AVR, but these can be called "TX empty" or "FIFO empty" or FIFO threshold" or similar.
$endgroup$
– Eugene Sh.
7 hours ago
1
1
$begingroup$
Why would you need to poll to initiate a transfer? Anyway, there are interrupts for transmission completion as well. I am not very into AVR, but these can be called "TX empty" or "FIFO empty" or FIFO threshold" or similar.
$endgroup$
– Eugene Sh.
7 hours ago
$begingroup$
Why would you need to poll to initiate a transfer? Anyway, there are interrupts for transmission completion as well. I am not very into AVR, but these can be called "TX empty" or "FIFO empty" or FIFO threshold" or similar.
$endgroup$
– Eugene Sh.
7 hours ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
There are interrupt vectors for both RXC and TXC (RX and TX complete) on AVRs. You should never have to poll for these unless you want to.
AVRFreaks has a nice post on this, and so does the manufacturer.
answered 7 hours ago
evildemonicevildemonic
2,110719
$endgroup$
add a comment |
$begingroup$
The interrupt routine stores the data in a buffer (a circular buffer with put and get pointers works nicely). The main loop checks to see if there is data in the buffer and when there is, takes it out. The main loop can do other things but needs to check and remove the data before the interrupt buffer overflows (when the put meets up with the get).
It won't compile but this illustrates the method.
char circ_buf[BUFFER_SIZE];
int get_index, put_index;
void initialize(void) {
get_index = 0;
put_index = 0;
}
isr serial_port_interrupt(void) { // interrupt
circ_buf[put_index++] = SERIAL_PORT_REGISTER;
if(put_index==BUFFER_SIZE) put_index = 0; // circular buffer
if(put_index==get_index) error("buffer overflow"); // oops
}
void background routine(void) {
while(put_index!=get_index) { // or if()
ch = circ_buf[get_index++];
// do something with ch
if(get_index==BUFFER_SIZE) get_index = 0;
}
}
answered 1 hour ago
WarrenWarren
763
$endgroup$
add a comment |
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2 Answers
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active
oldest
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2 Answers
2
active
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$begingroup$
There are interrupt vectors for both RXC and TXC (RX and TX complete) on AVRs. You should never have to poll for these unless you want to.
AVRFreaks has a nice post on this, and so does the manufacturer.
answered 7 hours ago
evildemonicevildemonic
2,110719
$endgroup$
add a comment |
$begingroup$
There are interrupt vectors for both RXC and TXC (RX and TX complete) on AVRs. You should never have to poll for these unless you want to.
AVRFreaks has a nice post on this, and so does the manufacturer.
answered 7 hours ago
evildemonicevildemonic
2,110719
$endgroup$
add a comment |
$begingroup$
There are interrupt vectors for both RXC and TXC (RX and TX complete) on AVRs. You should never have to poll for these unless you want to.
AVRFreaks has a nice post on this, and so does the manufacturer.
answered 7 hours ago
evildemonicevildemonic
2,110719
$endgroup$
There are interrupt vectors for both RXC and TXC (RX and TX complete) on AVRs. You should never have to poll for these unless you want to.
AVRFreaks has a nice post on this, and so does the manufacturer.
answered 7 hours ago
evildemonicevildemonic
2,110719
answered 7 hours ago
evildemonicevildemonic
2,110719
answered 7 hours ago
evildemonicevildemonic
2,110719
answered 7 hours ago
evildemonicevildemonic
2,110719
2,110719
add a comment |
add a comment |
$begingroup$
The interrupt routine stores the data in a buffer (a circular buffer with put and get pointers works nicely). The main loop checks to see if there is data in the buffer and when there is, takes it out. The main loop can do other things but needs to check and remove the data before the interrupt buffer overflows (when the put meets up with the get).
It won't compile but this illustrates the method.
char circ_buf[BUFFER_SIZE];
int get_index, put_index;
void initialize(void) {
get_index = 0;
put_index = 0;
}
isr serial_port_interrupt(void) { // interrupt
circ_buf[put_index++] = SERIAL_PORT_REGISTER;
if(put_index==BUFFER_SIZE) put_index = 0; // circular buffer
if(put_index==get_index) error("buffer overflow"); // oops
}
void background routine(void) {
while(put_index!=get_index) { // or if()
ch = circ_buf[get_index++];
// do something with ch
if(get_index==BUFFER_SIZE) get_index = 0;
}
}
answered 1 hour ago
WarrenWarren
763
$endgroup$
add a comment |
$begingroup$
The interrupt routine stores the data in a buffer (a circular buffer with put and get pointers works nicely). The main loop checks to see if there is data in the buffer and when there is, takes it out. The main loop can do other things but needs to check and remove the data before the interrupt buffer overflows (when the put meets up with the get).
It won't compile but this illustrates the method.
char circ_buf[BUFFER_SIZE];
int get_index, put_index;
void initialize(void) {
get_index = 0;
put_index = 0;
}
isr serial_port_interrupt(void) { // interrupt
circ_buf[put_index++] = SERIAL_PORT_REGISTER;
if(put_index==BUFFER_SIZE) put_index = 0; // circular buffer
if(put_index==get_index) error("buffer overflow"); // oops
}
void background routine(void) {
while(put_index!=get_index) { // or if()
ch = circ_buf[get_index++];
// do something with ch
if(get_index==BUFFER_SIZE) get_index = 0;
}
}
answered 1 hour ago
WarrenWarren
763
$endgroup$
add a comment |
$begingroup$
The interrupt routine stores the data in a buffer (a circular buffer with put and get pointers works nicely). The main loop checks to see if there is data in the buffer and when there is, takes it out. The main loop can do other things but needs to check and remove the data before the interrupt buffer overflows (when the put meets up with the get).
It won't compile but this illustrates the method.
char circ_buf[BUFFER_SIZE];
int get_index, put_index;
void initialize(void) {
get_index = 0;
put_index = 0;
}
isr serial_port_interrupt(void) { // interrupt
circ_buf[put_index++] = SERIAL_PORT_REGISTER;
if(put_index==BUFFER_SIZE) put_index = 0; // circular buffer
if(put_index==get_index) error("buffer overflow"); // oops
}
void background routine(void) {
while(put_index!=get_index) { // or if()
ch = circ_buf[get_index++];
// do something with ch
if(get_index==BUFFER_SIZE) get_index = 0;
}
}
answered 1 hour ago
WarrenWarren
763
$endgroup$
The interrupt routine stores the data in a buffer (a circular buffer with put and get pointers works nicely). The main loop checks to see if there is data in the buffer and when there is, takes it out. The main loop can do other things but needs to check and remove the data before the interrupt buffer overflows (when the put meets up with the get).
It won't compile but this illustrates the method.
char circ_buf[BUFFER_SIZE];
int get_index, put_index;
void initialize(void) {
get_index = 0;
put_index = 0;
}
isr serial_port_interrupt(void) { // interrupt
circ_buf[put_index++] = SERIAL_PORT_REGISTER;
if(put_index==BUFFER_SIZE) put_index = 0; // circular buffer
if(put_index==get_index) error("buffer overflow"); // oops
}
void background routine(void) {
while(put_index!=get_index) { // or if()
ch = circ_buf[get_index++];
// do something with ch
if(get_index==BUFFER_SIZE) get_index = 0;
}
}
answered 1 hour ago
WarrenWarren
763
answered 1 hour ago
WarrenWarren
763
answered 1 hour ago
WarrenWarren
763
answered 1 hour ago
WarrenWarren
763
763
add a comment |
add a comment |
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$begingroup$
Why would you need to poll to initiate a transfer? Anyway, there are interrupts for transmission completion as well. I am not very into AVR, but these can be called "TX empty" or "FIFO empty" or FIFO threshold" or similar.
$endgroup$
– Eugene Sh.
7 hours ago