From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:40354) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghWpK-0000IW-BB for qemu-devel@nongnu.org; Thu, 10 Jan 2019 04:40:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghWpJ-0007aY-9w for qemu-devel@nongnu.org; Thu, 10 Jan 2019 04:40:38 -0500 From: Stefan Hajnoczi Date: Thu, 10 Jan 2019 09:40:20 +0000 Message-Id: <20190110094020.18354-3-stefanha@redhat.com> In-Reply-To: <20190110094020.18354-1-stefanha@redhat.com> References: <20190110094020.18354-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PATCH v2 2/2] tests/microbit-test: add TWI stub device test List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Laurent Vivier , Joel Stanley , Peter Maydell , jim@groklearning.com, qemu-arm@nongnu.org, jusual@mail.ru, Thomas Huth , contrib@steffen-goertz.de, Stefan Hajnoczi This test verifies that we read back the expected I2C WHO_AM_I register values for the accelerometer/magnetometer. Signed-off-by: Stefan Hajnoczi --- tests/microbit-test.c | 44 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/tests/microbit-test.c b/tests/microbit-test.c index 0c125535f6..dcdc0cd41a 100644 --- a/tests/microbit-test.c +++ b/tests/microbit-test.c @@ -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 =3D readl(NRF51_TWI_BASE + NRF51_TWI_EVENT_TXDSENT); + g_assert_cmpuint(val, =3D=3D, 1); + writel(NRF51_TWI_BASE + NRF51_TWI_TASK_STOP, 1); + + writel(NRF51_TWI_BASE + NRF51_TWI_TASK_STARTRX, 1); + val =3D readl(NRF51_TWI_BASE + NRF51_TWI_EVENT_RXDREADY); + g_assert_cmpuint(val, =3D=3D, 1); + val =3D 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 =3D i2c_read_byte(0x3A, 0x0D); + g_assert_cmpuint(val, =3D=3D, 0x5A); + + val =3D i2c_read_byte(0x3A, 0x0D); + g_assert_cmpuint(val, =3D=3D, 0x5A); + + /* LSM303 accelerometer detection */ + val =3D i2c_read_byte(0x3C, 0x4F); + g_assert_cmpuint(val, =3D=3D, 0x40); + + writel(NRF51_TWI_BASE + NRF51_TWI_REG_ENABLE, 0); +} =20 static void test_nrf51_gpio(void) { @@ -247,6 +290,7 @@ int main(int argc, char **argv) =20 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); =20 ret =3D g_test_run(); =20 --=20 2.20.1