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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. 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... 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 );