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Flush the uart tx fifo before a restart. (#274)

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Also comment the point at which the bus clock that drives the uart changes on startup and comment out the change in the uart divisor. This at least allows a consistent uart baud rate during a restart if using the rate 115200.
This commit is contained in:
Our Air Quality 2016-11-18 20:34:03 +11:00 • committed by sheinz
parent 0dadda86de
commit 1728ef3dfc
2 changed files with 27 additions and 6 deletions
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17
core/app_main.c
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@ -254,12 +254,25 @@ static void zero_bss(void) {
// .Lfunc006 -- .irom0.text+0x70
static void init_networking(sdk_phy_info_t *phy_info, uint8_t *mac_addr) {
// The call to sdk_register_chipv6_phy appears to change the bus clock,
// perhaps from 40MHz to 26MHz, at least it has such an effect on the uart
// baud rate. The caller flushes the TX fifos.
if (sdk_register_chipv6_phy(phy_info)) {
printf("FATAL: sdk_register_chipv6_phy failed");
abort();
}
uart_set_baud(0, 74906);
uart_set_baud(1, 74906);
// The boot rom initializes uart0 for a 115200 baud rate but the bus clock
// does not appear to be as expected so the initial baud rate is actually
// 74906. On a cold boot, to keep the 74906 baud rate the uart0 divisor
// would need to changed here to 74906. On a warm boot the bus clock is
// expected to have already been set so the boot baud rate is 115200.
// Reset the rate here and settle on a 115200 baud rate.
if (sdk_rst_if.reason > 0) {
uart_set_baud(0, 115200);
uart_set_baud(1, 115200);
}
sdk_phy_disable_agc();
sdk_ieee80211_phy_init(sdk_g_ic.s.phy_mode);
sdk_lmacInit();