Commit b36356f6 authored by Stefan Hajnoczi's avatar Stefan Hajnoczi Committed by Peter Maydell
Browse files

tests/microbit-test: add TWI stub device test 



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

Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Message-id: 20190110094020.18354-3-stefanha@redhat.com
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 9d68bf56

tests/microbit-test.c

+44 −0
Original line number Diff line number Diff line
@@ -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();