tests/qtest/microbit-test.c

   1 /*
   2  * QTest testcase for Microbit board using the Nordic Semiconductor nRF51 SoC.
   3  *
   4  * nRF51:
   5  * Reference Manual: http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.pdf
   6  * Product Spec: http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.1.pdf
   7  *
   8  * Microbit Board: http://microbit.org/
   9  *
  10  * Copyright 2018 Steffen Görtz <contrib@steffen-goertz.de>
  11  *
  12  * This code is licensed under the GPL version 2 or later.  See
  13  * the COPYING file in the top-level directory.
  14  */
  15
  16
  17 #include "qemu/osdep.h"
  18 #include "exec/hwaddr.h"
  19 #include "libqtest.h"
  20
  21 #include "hw/arm/nrf51.h"
  22 #include "hw/char/nrf51_uart.h"
  23 #include "hw/gpio/nrf51_gpio.h"
  24 #include "hw/nvram/nrf51_nvm.h"
  25 #include "hw/timer/nrf51_timer.h"
  26 #include "hw/i2c/microbit_i2c.h"
  27
  28 static bool uart_wait_for_event(QTestState *qts, uint32_t event_addr)
  29 {
  30     time_t now, start = time(NULL);
  31
  32     while (true) {
  33         if (qtest_readl(qts, event_addr) == 1) {
  34             qtest_writel(qts, event_addr, 0x00);
  35             return true;
  36         }
  37
  38         /* Wait at most 10 minutes */
  39         now = time(NULL);
  40         if (now - start > 600) {
  41             break;
  42         }
  43         g_usleep(10000);
  44     }
  45
  46     return false;
  47 }
  48
  49 static void uart_rw_to_rxd(QTestState *qts, int sock_fd, const char *in,
  50                            char *out)
  51 {
  52     int i, in_len = strlen(in);
  53
  54     g_assert_true(send(sock_fd, in, in_len, 0) == in_len);
  55     for (i = 0; i < in_len; i++) {
  56         g_assert_true(uart_wait_for_event(qts, NRF51_UART_BASE +
  57                                                A_UART_RXDRDY));
  58         out[i] = qtest_readl(qts, NRF51_UART_BASE + A_UART_RXD);
  59     }
  60     out[i] = '\0';
  61 }
  62
  63 static void uart_w_to_txd(QTestState *qts, const char *in)
  64 {
  65     int i, in_len = strlen(in);
  66
  67     for (i = 0; i < in_len; i++) {
  68         qtest_writel(qts, NRF51_UART_BASE + A_UART_TXD, in[i]);
  69         g_assert_true(uart_wait_for_event(qts, NRF51_UART_BASE +
  70                                                A_UART_TXDRDY));
  71     }
  72 }
  73
  74 static void test_nrf51_uart(void)
  75 {
  76     int sock_fd;
  77     char s[10];
  78     QTestState *qts = qtest_init_with_serial("-M microbit", &sock_fd);
  79
  80     g_assert_true(send(sock_fd, "c", 1, 0) == 1);
  81     g_assert_cmphex(qtest_readl(qts, NRF51_UART_BASE + A_UART_RXD), ==, 0x00);
  82
  83     qtest_writel(qts, NRF51_UART_BASE + A_UART_ENABLE, 0x04);
  84     qtest_writel(qts, NRF51_UART_BASE + A_UART_STARTRX, 0x01);
  85
  86     g_assert_true(uart_wait_for_event(qts, NRF51_UART_BASE + A_UART_RXDRDY));
  87     qtest_writel(qts, NRF51_UART_BASE + A_UART_RXDRDY, 0x00);
  88     g_assert_cmphex(qtest_readl(qts, NRF51_UART_BASE + A_UART_RXD), ==, 'c');
  89
  90     qtest_writel(qts, NRF51_UART_BASE + A_UART_INTENSET, 0x04);
  91     g_assert_cmphex(qtest_readl(qts, NRF51_UART_BASE + A_UART_INTEN), ==, 0x04);
  92     qtest_writel(qts, NRF51_UART_BASE + A_UART_INTENCLR, 0x04);
  93     g_assert_cmphex(qtest_readl(qts, NRF51_UART_BASE + A_UART_INTEN), ==, 0x00);
  94
  95     uart_rw_to_rxd(qts, sock_fd, "hello", s);
  96     g_assert_true(memcmp(s, "hello", 5) == 0);
  97
  98     qtest_writel(qts, NRF51_UART_BASE + A_UART_STARTTX, 0x01);
  99     uart_w_to_txd(qts, "d");
 100     g_assert_true(recv(sock_fd, s, 10, 0) == 1);
 101     g_assert_cmphex(s[0], ==, 'd');
 102
 103     qtest_writel(qts, NRF51_UART_BASE + A_UART_SUSPEND, 0x01);
 104     qtest_writel(qts, NRF51_UART_BASE + A_UART_TXD, 'h');
 105     qtest_writel(qts, NRF51_UART_BASE + A_UART_STARTTX, 0x01);
 106     uart_w_to_txd(qts, "world");
 107     g_assert_true(recv(sock_fd, s, 10, 0) == 5);
 108     g_assert_true(memcmp(s, "world", 5) == 0);
 109
 110     closesocket(sock_fd);
 111
 112     qtest_quit(qts);
 113 }
 114
 115 /* Read a byte from I2C device at @addr from register @reg */
 116 static uint32_t i2c_read_byte(QTestState *qts, uint32_t addr, uint32_t reg)
 117 {
 118     uint32_t val;
 119
 120     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_REG_ADDRESS, addr);
 121     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_TASK_STARTTX, 1);
 122     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_REG_TXD, reg);
 123     val = qtest_readl(qts, NRF51_TWI_BASE + NRF51_TWI_EVENT_TXDSENT);
 124     g_assert_cmpuint(val, ==, 1);
 125     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_TASK_STOP, 1);
 126
 127     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_TASK_STARTRX, 1);
 128     val = qtest_readl(qts, NRF51_TWI_BASE + NRF51_TWI_EVENT_RXDREADY);
 129     g_assert_cmpuint(val, ==, 1);
 130     val = qtest_readl(qts, NRF51_TWI_BASE + NRF51_TWI_REG_RXD);
 131     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_TASK_STOP, 1);
 132
 133     return val;
 134 }
 135
 136 static void test_microbit_i2c(void)
 137 {
 138     uint32_t val;
 139     QTestState *qts = qtest_init("-M microbit");
 140
 141     /* We don't program pins/irqs but at least enable the device */
 142     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_REG_ENABLE, 5);
 143
 144     /* MMA8653 magnetometer detection */
 145     val = i2c_read_byte(qts, 0x3A, 0x0D);
 146     g_assert_cmpuint(val, ==, 0x5A);
 147
 148     val = i2c_read_byte(qts, 0x3A, 0x0D);
 149     g_assert_cmpuint(val, ==, 0x5A);
 150
 151     /* LSM303 accelerometer detection */
 152     val = i2c_read_byte(qts, 0x3C, 0x4F);
 153     g_assert_cmpuint(val, ==, 0x40);
 154
 155     qtest_writel(qts, NRF51_TWI_BASE + NRF51_TWI_REG_ENABLE, 0);
 156
 157     qtest_quit(qts);
 158 }
 159
 160 #define FLASH_SIZE          (256 * NRF51_PAGE_SIZE)
 161
 162 static void fill_and_erase(QTestState *qts, hwaddr base, hwaddr size,
 163                            uint32_t address_reg)
 164 {
 165     hwaddr i;
 166
 167     /* Erase Page */
 168     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x02);
 169     qtest_writel(qts, NRF51_NVMC_BASE + address_reg, base);
 170     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 171
 172     /* Check memory */
 173     for (i = 0; i < size / 4; i++) {
 174         g_assert_cmpuint(qtest_readl(qts, base + i * 4), ==, 0xFFFFFFFF);
 175     }
 176
 177     /* Fill memory */
 178     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x01);
 179     for (i = 0; i < size / 4; i++) {
 180         qtest_writel(qts, base + i * 4, i);
 181         g_assert_cmpuint(qtest_readl(qts, base + i * 4), ==, i);
 182     }
 183     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 184 }
 185
 186 static void test_nrf51_nvmc(void)
 187 {
 188     uint32_t value;
 189     hwaddr i;
 190     QTestState *qts = qtest_init("-M microbit");
 191
 192     /* Test always ready */
 193     value = qtest_readl(qts, NRF51_NVMC_BASE + NRF51_NVMC_READY);
 194     g_assert_cmpuint(value & 0x01, ==, 0x01);
 195
 196     /* Test write-read config register */
 197     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x03);
 198     g_assert_cmpuint(qtest_readl(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG),
 199                      ==, 0x03);
 200     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 201     g_assert_cmpuint(qtest_readl(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG),
 202                      ==, 0x00);
 203
 204     /* Test PCR0 */
 205     fill_and_erase(qts, NRF51_FLASH_BASE, NRF51_PAGE_SIZE,
 206                    NRF51_NVMC_ERASEPCR0);
 207     fill_and_erase(qts, NRF51_FLASH_BASE + NRF51_PAGE_SIZE,
 208                    NRF51_PAGE_SIZE, NRF51_NVMC_ERASEPCR0);
 209
 210     /* Test PCR1 */
 211     fill_and_erase(qts, NRF51_FLASH_BASE, NRF51_PAGE_SIZE,
 212                    NRF51_NVMC_ERASEPCR1);
 213     fill_and_erase(qts, NRF51_FLASH_BASE + NRF51_PAGE_SIZE,
 214                    NRF51_PAGE_SIZE, NRF51_NVMC_ERASEPCR1);
 215
 216     /* Erase all */
 217     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x02);
 218     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_ERASEALL, 0x01);
 219     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 220
 221     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x01);
 222     for (i = 0; i < FLASH_SIZE / 4; i++) {
 223         qtest_writel(qts, NRF51_FLASH_BASE + i * 4, i);
 224         g_assert_cmpuint(qtest_readl(qts, NRF51_FLASH_BASE + i * 4), ==, i);
 225     }
 226     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 227
 228     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x02);
 229     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_ERASEALL, 0x01);
 230     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 231
 232     for (i = 0; i < FLASH_SIZE / 4; i++) {
 233         g_assert_cmpuint(qtest_readl(qts, NRF51_FLASH_BASE + i * 4),
 234                          ==, 0xFFFFFFFF);
 235     }
 236
 237     /* Erase UICR */
 238     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x02);
 239     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_ERASEUICR, 0x01);
 240     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 241
 242     for (i = 0; i < NRF51_UICR_SIZE / 4; i++) {
 243         g_assert_cmpuint(qtest_readl(qts, NRF51_UICR_BASE + i * 4),
 244                          ==, 0xFFFFFFFF);
 245     }
 246
 247     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x01);
 248     for (i = 0; i < NRF51_UICR_SIZE / 4; i++) {
 249         qtest_writel(qts, NRF51_UICR_BASE + i * 4, i);
 250         g_assert_cmpuint(qtest_readl(qts, NRF51_UICR_BASE + i * 4), ==, i);
 251     }
 252     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 253
 254     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x02);
 255     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_ERASEUICR, 0x01);
 256     qtest_writel(qts, NRF51_NVMC_BASE + NRF51_NVMC_CONFIG, 0x00);
 257
 258     for (i = 0; i < NRF51_UICR_SIZE / 4; i++) {
 259         g_assert_cmpuint(qtest_readl(qts, NRF51_UICR_BASE + i * 4),
 260                          ==, 0xFFFFFFFF);
 261     }
 262
 263     qtest_quit(qts);
 264 }
 265
 266 static void test_nrf51_gpio(void)
 267 {
 268     size_t i;
 269     uint32_t actual, expected;
 270
 271     struct {
 272         hwaddr addr;
 273         uint32_t expected;
 274     } const reset_state[] = {
 275         {NRF51_GPIO_REG_OUT, 0x00000000}, {NRF51_GPIO_REG_OUTSET, 0x00000000},
 276         {NRF51_GPIO_REG_OUTCLR, 0x00000000}, {NRF51_GPIO_REG_IN, 0x00000000},
 277         {NRF51_GPIO_REG_DIR, 0x00000000}, {NRF51_GPIO_REG_DIRSET, 0x00000000},
 278         {NRF51_GPIO_REG_DIRCLR, 0x00000000}
 279     };
 280
 281     QTestState *qts = qtest_init("-M microbit");
 282
 283     /* Check reset state */
 284     for (i = 0; i < ARRAY_SIZE(reset_state); i++) {
 285         expected = reset_state[i].expected;
 286         actual = qtest_readl(qts, NRF51_GPIO_BASE + reset_state[i].addr);
 287         g_assert_cmpuint(actual, ==, expected);
 288     }
 289
 290     for (i = 0; i < NRF51_GPIO_PINS; i++) {
 291         expected = 0x00000002;
 292         actual = qtest_readl(qts, NRF51_GPIO_BASE +
 293                                   NRF51_GPIO_REG_CNF_START + i * 4);
 294         g_assert_cmpuint(actual, ==, expected);
 295     }
 296
 297     /* Check dir bit consistency between dir and cnf */
 298     /* Check set via DIRSET */
 299     expected = 0x80000001;
 300     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_DIRSET, expected);
 301     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR);
 302     g_assert_cmpuint(actual, ==, expected);
 303     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START)
 304              & 0x01;
 305     g_assert_cmpuint(actual, ==, 0x01);
 306     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_END) & 0x01;
 307     g_assert_cmpuint(actual, ==, 0x01);
 308
 309     /* Check clear via DIRCLR */
 310     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_DIRCLR, 0x80000001);
 311     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR);
 312     g_assert_cmpuint(actual, ==, 0x00000000);
 313     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START)
 314              & 0x01;
 315     g_assert_cmpuint(actual, ==, 0x00);
 316     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_END) & 0x01;
 317     g_assert_cmpuint(actual, ==, 0x00);
 318
 319     /* Check set via DIR */
 320     expected = 0x80000001;
 321     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR, expected);
 322     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR);
 323     g_assert_cmpuint(actual, ==, expected);
 324     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START)
 325              & 0x01;
 326     g_assert_cmpuint(actual, ==, 0x01);
 327     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_END) & 0x01;
 328     g_assert_cmpuint(actual, ==, 0x01);
 329
 330     /* Reset DIR */
 331     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_DIR, 0x00000000);
 332
 333     /* Check Input propagates */
 334     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x00);
 335     qtest_set_irq_in(qts, "/machine/nrf51", "unnamed-gpio-in", 0, 0);
 336     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 337     g_assert_cmpuint(actual, ==, 0x00);
 338     qtest_set_irq_in(qts, "/machine/nrf51", "unnamed-gpio-in", 0, 1);
 339     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 340     g_assert_cmpuint(actual, ==, 0x01);
 341     qtest_set_irq_in(qts, "/machine/nrf51", "unnamed-gpio-in", 0, -1);
 342     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 343     g_assert_cmpuint(actual, ==, 0x01);
 344     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x02);
 345
 346     /* Check pull-up working */
 347     qtest_set_irq_in(qts, "/machine/nrf51", "unnamed-gpio-in", 0, 0);
 348     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0000);
 349     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 350     g_assert_cmpuint(actual, ==, 0x00);
 351     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b1110);
 352     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 353     g_assert_cmpuint(actual, ==, 0x01);
 354     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x02);
 355
 356     /* Check pull-down working */
 357     qtest_set_irq_in(qts, "/machine/nrf51", "unnamed-gpio-in", 0, 1);
 358     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0000);
 359     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 360     g_assert_cmpuint(actual, ==, 0x01);
 361     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0110);
 362     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 363     g_assert_cmpuint(actual, ==, 0x00);
 364     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0x02);
 365     qtest_set_irq_in(qts, "/machine/nrf51", "unnamed-gpio-in", 0, -1);
 366
 367     /* Check Output propagates */
 368     qtest_irq_intercept_out(qts, "/machine/nrf51");
 369     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b0011);
 370     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTSET, 0x01);
 371     g_assert_true(qtest_get_irq(qts, 0));
 372     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTCLR, 0x01);
 373     g_assert_false(qtest_get_irq(qts, 0));
 374
 375     /* Check self-stimulation */
 376     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b01);
 377     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTSET, 0x01);
 378     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 379     g_assert_cmpuint(actual, ==, 0x01);
 380
 381     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTCLR, 0x01);
 382     actual = qtest_readl(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_IN) & 0x01;
 383     g_assert_cmpuint(actual, ==, 0x00);
 384
 385     /*
 386      * Check short-circuit - generates an guest_error which must be checked
 387      * manually as long as qtest can not scan qemu_log messages
 388      */
 389     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_CNF_START, 0b01);
 390     qtest_writel(qts, NRF51_GPIO_BASE + NRF51_GPIO_REG_OUTSET, 0x01);
 391     qtest_set_irq_in(qts, "/machine/nrf51", "unnamed-gpio-in", 0, 0);
 392
 393     qtest_quit(qts);
 394 }
 395
 396 static void timer_task(QTestState *qts, hwaddr task)
 397 {
 398     qtest_writel(qts, NRF51_TIMER_BASE + task, NRF51_TRIGGER_TASK);
 399 }
 400
 401 static void timer_clear_event(QTestState *qts, hwaddr event)
 402 {
 403     qtest_writel(qts, NRF51_TIMER_BASE + event, NRF51_EVENT_CLEAR);
 404 }
 405
 406 static void timer_set_bitmode(QTestState *qts, uint8_t mode)
 407 {
 408     qtest_writel(qts, NRF51_TIMER_BASE + NRF51_TIMER_REG_BITMODE, mode);
 409 }
 410
 411 static void timer_set_prescaler(QTestState *qts, uint8_t prescaler)
 412 {
 413     qtest_writel(qts, NRF51_TIMER_BASE + NRF51_TIMER_REG_PRESCALER, prescaler);
 414 }
 415
 416 static void timer_set_cc(QTestState *qts, size_t idx, uint32_t value)
 417 {
 418     qtest_writel(qts, NRF51_TIMER_BASE + NRF51_TIMER_REG_CC0 + idx * 4, value);
 419 }
 420
 421 static void timer_assert_events(QTestState *qts, uint32_t ev0, uint32_t ev1,
 422                                 uint32_t ev2, uint32_t ev3)
 423 {
 424     g_assert(qtest_readl(qts, NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_0)
 425              == ev0);
 426     g_assert(qtest_readl(qts, NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_1)
 427              == ev1);
 428     g_assert(qtest_readl(qts, NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_2)
 429              == ev2);
 430     g_assert(qtest_readl(qts, NRF51_TIMER_BASE + NRF51_TIMER_EVENT_COMPARE_3)
 431              == ev3);
 432 }
 433
 434 static void test_nrf51_timer(void)
 435 {
 436     uint32_t steps_to_overflow = 408;
 437     QTestState *qts = qtest_init("-M microbit");
 438
 439     /* Compare Match */
 440     timer_task(qts, NRF51_TIMER_TASK_STOP);
 441     timer_task(qts, NRF51_TIMER_TASK_CLEAR);
 442
 443     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_0);
 444     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_1);
 445     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_2);
 446     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_3);
 447
 448     timer_set_bitmode(qts, NRF51_TIMER_WIDTH_16); /* 16 MHz Timer */
 449     timer_set_prescaler(qts, 0);
 450     /* Swept over, during the first step */
 451     timer_set_cc(qts, 0, 2);
 452     /* Barely miss, after the second step */
 453     timer_set_cc(qts, 1, 162);
 454     /* Spot on, after the third step */
 455     timer_set_cc(qts, 2, 480);
 456
 457     timer_assert_events(qts, 0, 0, 0, 0);
 458
 459     timer_task(qts, NRF51_TIMER_TASK_START);
 460     qtest_clock_step(qts, 10000);
 461     timer_assert_events(qts, 1, 0, 0, 0);
 462
 463     /* Swept over on first overflow */
 464     timer_set_cc(qts, 3, 114);
 465
 466     qtest_clock_step(qts, 10000);
 467     timer_assert_events(qts, 1, 1, 0, 0);
 468
 469     qtest_clock_step(qts, 10000);
 470     timer_assert_events(qts, 1, 1, 1, 0);
 471
 472     /* Wrap time until internal counter overflows */
 473     while (steps_to_overflow--) {
 474         timer_assert_events(qts, 1, 1, 1, 0);
 475         qtest_clock_step(qts, 10000);
 476     }
 477
 478     timer_assert_events(qts, 1, 1, 1, 1);
 479
 480     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_0);
 481     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_1);
 482     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_2);
 483     timer_clear_event(qts, NRF51_TIMER_EVENT_COMPARE_3);
 484     timer_assert_events(qts, 0, 0, 0, 0);
 485
 486     timer_task(qts, NRF51_TIMER_TASK_STOP);
 487
 488     /* Test Proposal: Stop/Shutdown */
 489     /* Test Proposal: Shortcut Compare -> Clear */
 490     /* Test Proposal: Shortcut Compare -> Stop */
 491     /* Test Proposal: Counter Mode */
 492
 493     qtest_quit(qts);
 494 }
 495
 496 int main(int argc, char **argv)
 497 {
 498     g_test_init(&argc, &argv, NULL);
 499
 500     qtest_add_func("/microbit/nrf51/uart", test_nrf51_uart);
 501     qtest_add_func("/microbit/nrf51/gpio", test_nrf51_gpio);
 502     qtest_add_func("/microbit/nrf51/nvmc", test_nrf51_nvmc);
 503     qtest_add_func("/microbit/nrf51/timer", test_nrf51_timer);
 504     qtest_add_func("/microbit/microbit/i2c", test_microbit_i2c);
 505
 506     return g_test_run();
 507 }