Use 2 UARTE with SDK15

Question

Hello, 
 I'm trying to configure 2 serial ports for a custom board with nRF52840 chip, but when I try to instance the second UART "NRF_SERIAL_UART_DEF(serial_uart1, 1);" the compiler raise an error. 
 ../../../../../../modules/nrfx/drivers/include/nrfx_uart.h:79:35: error: 'NRF_UART1' undeclared here (not in a function); did you mean 'NRF_UARTE1'? 
 I had this code working with SDK14.2, but with SDK15 this doesn't work. 
 I've compiled the example peripheral/serial changing the id instance from 0 to 1 with the same result. 
 I've activated UART1 and UARTE1 in sdk_config.h 
 Can you help me with this problem. 
 Thanks.

kl-cruz · Accepted Answer

Hi, 
 Sure! 
 That's right. UART1 is not supported. Serial peripheral with number 1 is only UARTE1 in nRF52840 SoC. 
 
 Required changes 
 To make it work with small amount of work please replace lines 77 and 78 in nRF5_SDK_15.0.0_a53641a\integration
rfx\legacy
rf_drv_uart.h file. 
 
 WIth code: 
 #define NRF_DRV_UART_CREATE_UART(id) _NRF_DRV_UART_CREATE_UART(id)
 #define _NRF_DRV_UART_CREATE_UART(id) NRF_DRV_UART_CREATE_UART_##id
 #define NRF_DRV_UART_CREATE_UART_0 \
 .uart = NRFX_UART_INSTANCE(0),
 #define NRF_DRV_UART_CREATE_UART_1 \
 .uart = { .p_reg = NULL }, 
 To achieve: 
 
 It adds support for UARTE1 in nrf_drv_uart layer. 
 
 How to catch the case when UARTE1 is using without easydma support 
 You can also add assert in nRF5_SDK_15.0.0_a53641a\integration
rfx\legacy
rf_drv_uart.c in line 115 to catch the case if somewhere UARTE1 is overriden to be used without EasyDMA support: 
 
 Please add code below: 
 #ifdef NRF52840_XXAA
 if (inst_idx == 1)
 {
 ASSERT(p_config->use_easy_dma);
 }
#endif 
 to achieve:

NRF_SERIAL with UARTE1 
 Please remember to use NRF_SERIAL_MODE_DMA when create instance for UARTE1 in nrf serial using NRF_SERIAL_CONFIG_DEF. 
 NRF_SERIAL_CONFIG_DEF(serial_config, NRF_SERIAL_MODE_DMA,
 &serial_queues, &serial_buffs, NULL, sleep_handler); 
 
 I think it should help You. In case of any problem please let me know!

Use 2 UARTE with SDK15

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