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/*
* QTest testcase for Microbit board using the Nordic Semiconductor nRF51 SoC.
*
* nRF51:
* Reference Manual: http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.pdf
* Product Spec: http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.1.pdf
*
* Microbit Board: http://microbit.org/
*
* Copyright 2018 Steffen Görtz <contrib@steffen-goertz.de>
*
* This code is licensed under the GPL version 2 or later. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "exec/hwaddr.h"
#include "libqtest.h"
#include "hw/arm/nrf51.h"
#include "hw/gpio/nrf51_gpio.h"
#include "hw/timer/nrf51_timer.h"
#include "hw/i2c/microbit_i2c.h"
/* Read a byte from I2C device at @addr from register @reg */
static uint32_t i2c_read_byte(uint32_t addr, uint32_t reg)
{
uint32_t val;
writel(NRF51_TWI_BASE + NRF51_TWI_REG_ADDRESS, addr);
writel(NRF51_TWI_BASE + NRF51_TWI_TASK_STARTTX, 1);
writel(NRF51_TWI_BASE + NRF51_TWI_REG_TXD, reg);
val = readl(NRF51_TWI_BASE + NRF51_TWI_EVENT_TXDSENT);
g_assert_cmpuint(val, ==, 1);
writel(NRF51_TWI_BASE + NRF51_TWI_TASK_STOP, 1);
writel(NRF51_TWI_BASE + NRF51_TWI_TASK_STARTRX, 1);
val = readl(NRF51_TWI_BASE + NRF51_TWI_EVENT_RXDREADY);
g_assert_cmpuint(val, ==, 1);
val = readl(NRF51_TWI_BASE + NRF51_TWI_REG_RXD);
writel(NRF51_TWI_BASE + NRF51_TWI_TASK_STOP, 1);
return val;
}
static void test_microbit_i2c(void)
{
uint32_t val;
/* We don't program pins/irqs but at least enable the device */
writel(NRF51_TWI_BASE + NRF51_TWI_REG_ENABLE, 5);
/* MMA8653 magnetometer detection */
val = i2c_read_byte(0x3A, 0x0D);
g_assert_cmpuint(val, ==, 0x5A);
val = i2c_read_byte(0x3A, 0x0D);
g_assert_cmpuint(val, ==, 0x5A);
/* LSM303 accelerometer detection */
val = i2c_read_byte(0x3C, 0x4F);
g_assert_cmpuint(val, ==, 0x40);
writel(NRF51_TWI_BASE + NRF51_TWI_REG_ENABLE, 0);
}
static void test_nrf51_gpio(void)
{
size_t i;
uint32_t actual, expected;
struct {
hwaddr addr;
uint32_t expected;
} const reset_state[] = {
{NRF51_GPIO_REG_OUT, 0x00000000}, {NRF51_GPIO_REG_OUTSET, 0x00000000},
{NRF51_GPIO_REG_OUTCLR, 0x00000000}, {NRF51_GPIO_REG_IN, 0x00000000},
{NRF51_GPIO_REG_DIR, 0x00000000}, {NRF51_GPIO_REG_DIRSET, 0x00000000},
{NRF51_GPIO_REG_DIRCLR, 0x00000000}
};
/* Check reset state */
for (i = 0; i < ARRAY_SIZE(reset_state); i++) {
expected = reset_state[i].expected;
actual = readl(NRF51_GPIO_BASE + reset_state[i].addr);
g_assert_cmpuint(actual, ==, expected);
}
for (i = 0; i < NRF51_GPIO_PINS; i++) {
expected = 0x00000002;
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START + i * 4);
g_assert_cmpuint(actual, ==, expected);
}
/* Check dir bit consistency between dir and cnf */
/* Check set via DIRSET */
expected = 0x80000001;
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_DIRSET, expected);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR);
g_assert_cmpuint(actual, ==, expected);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_END) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
/* Check clear via DIRCLR */
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_DIRCLR, 0x80000001);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR);
g_assert_cmpuint(actual, ==, 0x00000000);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START) & 0x01;
g_assert_cmpuint(actual, ==, 0x00);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_END) & 0x01;
g_assert_cmpuint(actual, ==, 0x00);
/* Check set via DIR */
expected = 0x80000001;
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR, expected);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR);
g_assert_cmpuint(actual, ==, expected);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_END) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
/* Reset DIR */
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR, 0x00000000);
/* Check Input propagates */
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x00);
qtest_set_irq_in(global_qtest, "/machine/nrf51", "unnamed-gpio-in", 0, 0);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x00);
qtest_set_irq_in(global_qtest, "/machine/nrf51", "unnamed-gpio-in", 0, 1);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
qtest_set_irq_in(global_qtest, "/machine/nrf51", "unnamed-gpio-in", 0, -1);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x02);
/* Check pull-up working */
qtest_set_irq_in(global_qtest, "/machine/nrf51", "unnamed-gpio-in", 0, 0);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0000);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x00);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b1110);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x02);
/* Check pull-down working */
qtest_set_irq_in(global_qtest, "/machine/nrf51", "unnamed-gpio-in", 0, 1);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0000);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0110);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x00);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x02);
qtest_set_irq_in(global_qtest, "/machine/nrf51", "unnamed-gpio-in", 0, -1);
/* Check Output propagates */
irq_intercept_out("/machine/nrf51");
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0011);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTSET, 0x01);
g_assert_true(get_irq(0));
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTCLR, 0x01);
g_assert_false(get_irq(0));
/* Check self-stimulation */
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b01);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTSET, 0x01);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x01);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTCLR, 0x01);
actual = readl(NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
g_assert_cmpuint(actual, ==, 0x00);
/*
* Check short-circuit - generates an guest_error which must be checked
* manually as long as qtest can not scan qemu_log messages
*/
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b01);
writel(NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTSET, 0x01);
qtest_set_irq_in(global_qtest, "/machine/nrf51", "unnamed-gpio-in", 0, 0);
}
static void timer_task(hwaddr task)
{
writel(NRF51_TIMER_BASE + task, NRF51_TRIGGER_TASK);
}
static void timer_clear_event(hwaddr event)
{
writel(NRF51_TIMER_BASE + event, NRF51_EVENT_CLEAR);
}
static void timer_set_bitmode(uint8_t mode)
{
writel(NRF51_TIMER_BASE + NRF51_TIMER_REG_BITMODE, mode);
}
static void timer_set_prescaler(uint8_t prescaler)
{
writel(NRF51_TIMER_BASE + NRF51_TIMER_REG_PRESCALER, prescaler);
}
static void timer_set_cc(size_t idx, uint32_t value)
{
writel(NRF51_TIMER_BASE + NRF51_TIMER_REG_CC0 + idx * 4, value);
}
static void timer_assert_events(uint32_t ev0, uint32_t ev1, uint32_t ev2,
uint32_t ev3)
{
g_assert(readl(NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_0) == ev0);
g_assert(readl(NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_1) == ev1);
g_assert(readl(NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_2) == ev2);
g_assert(readl(NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_3) == ev3);
}
static void test_nrf51_timer(void)
{
uint32_t steps_to_overflow = 408;
/* Compare Match */
timer_task(NRF51_TIMER_TASK_STOP);
timer_task(NRF51_TIMER_TASK_CLEAR);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_0);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_1);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_2);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_3);
timer_set_bitmode(NRF51_TIMER_WIDTH_16); /* 16 MHz Timer */
timer_set_prescaler(0);
/* Swept over in first step */
timer_set_cc(0, 2);
/* Barely miss on first step */
timer_set_cc(1, 162);
/* Spot on on third step */
timer_set_cc(2, 480);
timer_assert_events(0, 0, 0, 0);
timer_task(NRF51_TIMER_TASK_START);
clock_step(10000);
timer_assert_events(1, 0, 0, 0);
/* Swept over on first overflow */
timer_set_cc(3, 114);
clock_step(10000);
timer_assert_events(1, 1, 0, 0);
clock_step(10000);
timer_assert_events(1, 1, 1, 0);
/* Wrap time until internal counter overflows */
while (steps_to_overflow--) {
timer_assert_events(1, 1, 1, 0);
clock_step(10000);
}
timer_assert_events(1, 1, 1, 1);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_0);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_1);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_2);
timer_clear_event(NRF51_TIMER_EVENT_COMPARE_3);
timer_assert_events(0, 0, 0, 0);
timer_task(NRF51_TIMER_TASK_STOP);
/* Test Proposal: Stop/Shutdown */
/* Test Proposal: Shortcut Compare -> Clear */
/* Test Proposal: Shortcut Compare -> Stop */
/* Test Proposal: Counter Mode */
}
int main(int argc, char **argv)
{
int ret;
g_test_init(&argc, &argv, NULL);
global_qtest = qtest_initf("-machine microbit");
qtest_add_func("/microbit/nrf51/gpio", test_nrf51_gpio);
qtest_add_func("/microbit/nrf51/timer", test_nrf51_timer);
qtest_add_func("/microbit/microbit/i2c", test_microbit_i2c);
ret = g_test_run();
qtest_quit(global_qtest);
return ret;
}
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