10000 stm32/rfcore: Intercept addr-resolution HCI cmd to work around BLE bug. by dpgeorge · Pull Request #7111 · micropython/micropython · GitHub
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stm32/rfcore: Intercept addr-resolution HCI cmd to work around BLE bug. #7111

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Merged
merged 1 commit into from
Apr 12, 2021
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stm32/rfcore: Intercept addr-resolution HCI cmd to work around BLE bug. #7111

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18 changes: 18 additions & 0 deletions ports/stm32/rfcore.c
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Original file line number Diff line number Diff line change
Expand Up @@ -610,6 +610,24 @@ void rfcore_ble_hci_cmd(size_t len, const uint8_t *src) {
tl_list_node_t *n;
uint32_t ch;
if (src[0] == HCI_KIND_BT_CMD) {
// The STM32WB has a problem when address resolution is enabled: under certain
// conditions the MCU can get into a state where it draws an additional 10mA
// or so and eventually ends up with a broken BLE RX path in the silicon. A
// simple way to reproduce this is to enable address resolution (which is the
// default for NimBLE) and start the device advertising. If there is enough
// BLE activity in the vicinity then the device will at some point enter the
// bad state and, if left long enough, will have permanent BLE RX damage.
//
// STMicroelectronics are aware of this issue. The only known workaround at
// this stage is to not enable address resolution. We do that here by
// intercepting any command that enables address resolution and convert it
// into a command that disables address resolution.
//
// OGF=0x08 OCF=0x002d HCI_LE_Set_Address_Resolution_Enable
if (len == 5 && memcmp(src + 1, "\x2d\x20\x01\x01", 4) == 0) {
src = (const uint8_t *)"\x01\x2d\x20\x01\x00";
}

n = (tl_list_node_t *)&ipcc_membuf_ble_cmd_buf[0];
ch = IPCC_CH_BLE;
} else if (src[0] == HCI_KIND_BT_ACL) {
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