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tests/microbit-test: add TWI stub device test

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This test verifies that we read back the expected I2C WHO_AM_I register
values for the accelerometer/magnetometer.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20190110094020.18354-3-stefanha@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Stefan Hajnoczi 2019-01-29 11:46:03 +00:00 committed by Peter Maydell
parent 9d68bf564e
commit b36356f699
1 changed files with 44 additions and 0 deletions
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44
tests/microbit-test.c
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@ -21,6 +21,49 @@
#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)
{
@ -247,6 +290,7 @@ int main(int argc, char **argv)
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();