Hello guys,
I'm trying to run uart example from https://github.com/andenore/NordicSnippets/blob/master/examples/uart/main.c extended by interrupts call after transmission end on nRF52840 Dongle. I'm not able to successfully make CPU to call an interrupt handler. Bypassing "NVIC_SetVector", causes handler to not be called at all. And when I call "NVIC_SetVector" on configuration step and point to my interrupt handler, cpu restart after interrupt is enabled. I read that the interrupts are managed by the MBR that my board has, is this require some special configuration? I'm using an nRF Connect Programmer to upload hex file.
I tried with and without softdevice, with handler name "UART0_IRQHandler" and "UARTE0_UART0_IRQHandler", with different interrupt priorities and different interrupts enabled. It's always same effect, restart or no reaction at all. As far I can tell without debugger, interrupt routine is never called. I will appreciate the help very much. I just started with nRF52 and I'm already pulling my hair out ;)
I'm using Visual Studio Code 1.68.1, with nRF Connect for VS Code Extension Pack v2022.5.1, project use nRF SDK in version 1.9.1.
uart.c
#include "uart.h"
#define RING_BUF_SIZE 4096
uint8_t txRingBufferData[RING_BUF_SIZE];
struct ring_buf txRingBuffer;
static uint8_t txBuffer[30];
void UART0_IRQHandler(void){
if (NRF_UARTE0->EVENTS_ENDTX) {
if (!ring_buf_is_empty(&txRingBuffer)) {
uint32_t dataSize = ring_buf_get(&txRingBuffer, txBuffer, sizeof(txBuffer));
NRF_UARTE0->TXD.PTR = (uint32_t)&txBuffer;
NRF_UARTE0->TXD.MAXCNT = dataSize;
NRF_UARTE0->TASKS_STARTTX = 1;
}
NRF_UARTE0->EVENTS_ENDTX = 0;
}
}
void uart_init(uint32_t txPin, uint32_t rxPin, uint32_t baudrate) {
// Disable UART
NRF_UARTE0->ENABLE = (UARTE_ENABLE_ENABLE_Disabled << UARTE_ENABLE_ENABLE_Pos);
// Configure the UARTE with no flow control, one parity bit and 115200 baud rate
NRF_UARTE0->CONFIG = (UART_CONFIG_HWFC_Disabled << UART_CONFIG_HWFC_Pos) | (UARTE_CONFIG_PARITY_Excluded << UART_CONFIG_PARITY_Pos);
NRF_UARTE0->BAUDRATE = baudrate;
// Select TX and RX pins
NRF_UARTE0->PSEL.TXD = (txPin << UARTE_PSEL_TXD_PIN_Pos) & UARTE_PSEL_TXD_PIN_Msk;
NRF_UARTE0->PSEL.RXD = (rxPin << UARTE_PSEL_RXD_PIN_Pos) & UARTE_PSEL_RXD_PIN_Msk;
ring_buf_init(&txRingBuffer, sizeof(txRingBufferData), txRingBufferData);
// Enable the UART (starts using the TX/RX pins)
NRF_UARTE0->ENABLE = UARTE_ENABLE_ENABLE_Enabled << UARTE_ENABLE_ENABLE_Pos;
// Enable UART TX End interrupt only
NRF_UARTE0->INTENSET = (UARTE_INTENSET_ENDTX_Set << UARTE_INTENSET_ENDTX_Pos);
NVIC_SetVector(UARTE0_UART0_IRQn, (uint32_t)UART0_IRQHandler);
NVIC_SetPriority(UARTE0_UART0_IRQn, 6);
NVIC_ClearPendingIRQ(UARTE0_UART0_IRQn);
NVIC_EnableIRQ(UARTE0_UART0_IRQn);
}
void uart_send(const uint8_t *data, uint32_t size) {
int rb_len = ring_buf_put(&txRingBuffer, data, size);
// // if (rb_len < size) {
// // LOG_ERR("Drop %u bytes", size - rb_len);
// // }
uint32_t dataSize = ring_buf_get(&txRingBuffer, txBuffer, sizeof(txBuffer));
NRF_UARTE0->TXD.PTR = (uint32_t)&txBuffer;
NRF_UARTE0->TXD.MAXCNT = dataSize;
NRF_UARTE0->EVENTS_ENDTX = 0;
NRF_UARTE0->TASKS_STARTTX = 1;
}
main.c
#include "nrf.h"
#include "uart.h"
#define PIN_LED_STATUS (6UL)
#define PIN_LED_GREEN (9UL)
#define PIN_LED_RED (8UL)
#define PIN_LED_BLUE (12UL)
#define PIN_TXD (29)
#define PIN_RXD (31)
void main(void) {
NRF_P0->PIN_CNF[PIN_LED_STATUS] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos) |
(GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
NRF_P0->PIN_CNF[PIN_LED_RED] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos) |
(GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
NRF_P0->PIN_CNF[PIN_LED_BLUE] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos) |
(GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
NRF_P1->PIN_CNF[PIN_LED_GREEN] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos) |
(GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
NRF_P0->OUTSET = (1UL << PIN_LED_STATUS);
NRF_P0->OUTSET = (1UL << PIN_LED_BLUE);
NRF_P0->OUTCLR = (1UL << PIN_LED_RED);
NRF_P1->OUTSET = (1UL << PIN_LED_GREEN);
// Enable HF clock
NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
NRF_CLOCK->TASKS_HFCLKSTART = 1;
while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0) {}
// Enable LF clock
NRF_CLOCK->LFCLKSRC = CLOCK_LFCLKSRC_SRC_Xtal;
NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
NRF_CLOCK->TASKS_LFCLKSTART = 1;
while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) {}
NRF_P0->OUTSET = (1UL << PIN_LED_RED);
NRF_P0->OUTCLR = (1UL << PIN_LED_STATUS);
uart_init(PIN_TXD, PIN_RXD, UARTE_BAUDRATE_BAUDRATE_Baud115200);
while (1) {
uint8_t buf1[] = "Foo baz, some entry.\r\n";
uart_send(buf1, sizeof(buf1));
uint32_t volatile tmo = 5000000;
//while (tmo--);
// uint8_t buf2[] = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse aliquet placerat nunc vitae luctus.\r\n";
// uart_send(buf2, sizeof(buf2));
tmo = 10000000;
while (tmo--);
}
}
Build log:
> Executing task: nRF Connect: Build: radio_module/build (active) <
Building radio_module
west build --build-dir e:\nRF52\Projects\radio_module\build e:\nRF52\Projects\radio_module
[0/1] Re-running CMake...
Including boilerplate (Zephyr base (cached)): C:/Users/Marek/ncs/v1.9.1/zephyr/cmake/app/boilerplate.cmake
-- Application: E:/nRF52/Projects/radio_module
-- Zephyr version: 2.7.99 (C:/Users/Marek/ncs/v1.9.1/zephyr), build: v2.7.99-ncs1-1
-- Found west (found suitable version "0.12.0", minimum required is "0.7.1")
-- Board: nrf52840dongle_nrf52840
-- Cache files will be written to: C:/Users/Marek/ncs/v1.9.1/zephyr/.cache
-- Found dtc: C:/Users/Marek/ncs/v1.9.1/toolchain/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found toolchain: gnuarmemb (c:/Users/Marek/ncs/v1.9.1/toolchain/opt)
-- Found BOARD.dts: C:/Users/Marek/ncs/v1.9.1/zephyr/boards/arm/nrf52840dongle_nrf52840/nrf52840dongle_nrf52840.dts
-- Generated zephyr.dts: E:/nRF52/Projects/radio_module/build/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: E:/nRF52/Projects/radio_module/build/zephyr/include/generated/devicetree_unfixed.h
-- Generated device_extern.h: E:/nRF52/Projects/radio_module/build/zephyr/include/generated/device_extern.h
-- Including generated dts.cmake file: E:/nRF52/Projects/radio_module/build/zephyr/dts.cmake
Parsing C:/Users/Marek/ncs/v1.9.1/zephyr/Kconfig
Loaded configuration 'E:/nRF52/Projects/radio_module/build/zephyr/.config'
Configuration saved to 'E:/nRF52/Projects/radio_module/build/zephyr/.config'
Kconfig header saved to 'E:/nRF52/Projects/radio_module/build/zephyr/include/generated/autoconf.h'
-- Configuring done
-- Generating done
-- Build files have been written to: E:/nRF52/Projects/radio_module/build
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../src/uart.c: In function 'uart_send':
e:\nRF52\Projects\radio_module\src\uart.c:49:9: warning: unused variable 'rb_len' [-Wunused-variable]
49 | int rb_len = ring_buf_put(&txRingBuffer, data, size);
| ^~~~~~
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