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doc timeouts

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Philippe Teuwen 2019-04-21 01:44:52 +02:00
parent a77ea12b77
commit 59963eb41e
1 changed files with 29 additions and 0 deletions
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29
doc/new_frame_format.txt
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@ -192,3 +192,32 @@ TODO
We need to be very careful to make a flasher that can deal with old & new bootroms.
New bootrom might need to also still support old frame format, to ease flashing back to repos supporting the old format...
Timings
=======
Needed to increase client RX uart timeout: it was 30ms, we put arbitrarily 300ms as for TCP
(uart/uart_posix.c)
struct timeval timeout = {
.tv_sec = 0, // 0 second
.tv_usec = 300000 // 300 000 micro seconds
};
Add automatically some communication delay in the WaitForResponseTimeout timeout
Only when using FPC, timeout = 2* empirically measured delay (FTDI cable)
(client/comms.c)
static size_t communication_delay(void) {
if (send_via_fpc) // needed also for Windows USB USART??
return 2 * (12000000 / uart_speed);
return 100;
}
Needed to tune pm3 RX usart maxtry
(common/usart.c)
uint32_t usart_read_ng(uint8_t *data, size_t len) {
// Empirical max try observed: 3000000 / USART_BAUD_RATE
// Let's take 10x
uint32_t maxtry = 10 * ( 3000000 / USART_BAUD_RATE );