Errata nRF52840 - RADIO: High packet error rate in BLE Long Range mode

This anomaly applies to IC Rev. Engineering B, build codes QIAA-BA0, QIAA-BB0, CKAA-AA0.

Symptoms

High packet error rate.

BLE Long Range mode.

Poor communication link.

Use the following setting for the radio in BLE LR mode (set after power-on-reset and whenever NRF_RADIO->POWER has been low):


*(volatile uint32_t *) 0x40001740 = ((*((volatile uint32_t *) 0x40001740)) & 0x7FFF00FF) | 0x80000000 | (((uint32_t)(196)) << 8);

When switching from BLE LR mode to any other radio mode, use the following code to return to default settings:


*(volatile uint32_t *) 0x40001740 = ((*((volatile uint32_t *) 0x40001740)) & 0x7FFFFFFF);