mirror of https://github.com/xemu-project/xemu.git
tests/qtest: Add tests for the STM32L4x5 USART
Test: - read/write from/to the usart registers - send/receive a character/string over the serial port Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr> Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20240329174402.60382-6-arnaud.minier@telecom-paris.fr [PMM: fix checkpatch nits, remove commented out code] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Arnaud Minier
Peter Maydell
parent
92741432ed
commit
214652da12
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@ -7,6 +7,7 @@ slow_qtests = {
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'npcm7xx_pwm-test': 300,
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'npcm7xx_watchdog_timer-test': 120,
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'qom-test' : 900,
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'stm32l4x5_usart-test' : 600,
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'test-hmp' : 240,
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'pxe-test': 610,
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'prom-env-test': 360,
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@ -205,7 +206,8 @@ qtests_stm32l4x5 = \
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['stm32l4x5_exti-test',
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'stm32l4x5_syscfg-test',
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'stm32l4x5_rcc-test',
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'stm32l4x5_gpio-test']
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'stm32l4x5_gpio-test',
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'stm32l4x5_usart-test']
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qtests_arm = \
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(config_all_devices.has_key('CONFIG_MPS2') ? ['sse-timer-test'] : []) + \
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@ -0,0 +1,315 @@
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/*
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* QTest testcase for STML4X5_USART
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*
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* Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr>
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* Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "libqtest.h"
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#include "hw/misc/stm32l4x5_rcc_internals.h"
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#include "hw/registerfields.h"
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#define RCC_BASE_ADDR 0x40021000
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/* Use USART 1 ADDR, assume the others work the same */
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#define USART1_BASE_ADDR 0x40013800
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/* See stm32l4x5_usart for definitions */
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REG32(CR1, 0x00)
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FIELD(CR1, M1, 28, 1)
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FIELD(CR1, OVER8, 15, 1)
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FIELD(CR1, M0, 12, 1)
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FIELD(CR1, PCE, 10, 1)
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FIELD(CR1, TXEIE, 7, 1)
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FIELD(CR1, RXNEIE, 5, 1)
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FIELD(CR1, TE, 3, 1)
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FIELD(CR1, RE, 2, 1)
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FIELD(CR1, UE, 0, 1)
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REG32(CR2, 0x04)
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REG32(CR3, 0x08)
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FIELD(CR3, OVRDIS, 12, 1)
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REG32(BRR, 0x0C)
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REG32(GTPR, 0x10)
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REG32(RTOR, 0x14)
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REG32(RQR, 0x18)
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REG32(ISR, 0x1C)
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FIELD(ISR, TXE, 7, 1)
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FIELD(ISR, RXNE, 5, 1)
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FIELD(ISR, ORE, 3, 1)
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REG32(ICR, 0x20)
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REG32(RDR, 0x24)
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REG32(TDR, 0x28)
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#define NVIC_ISPR1 0XE000E204
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#define NVIC_ICPR1 0xE000E284
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#define USART1_IRQ 37
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static bool check_nvic_pending(QTestState *qts, unsigned int n)
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{
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/* No USART interrupts are less than 32 */
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assert(n > 32);
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n -= 32;
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return qtest_readl(qts, NVIC_ISPR1) & (1 << n);
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}
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static bool clear_nvic_pending(QTestState *qts, unsigned int n)
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{
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/* No USART interrupts are less than 32 */
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assert(n > 32);
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n -= 32;
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qtest_writel(qts, NVIC_ICPR1, (1 << n));
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return true;
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}
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/*
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* Wait indefinitely for the flag to be updated.
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* If this is run on a slow CI runner,
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* the meson harness will timeout after 10 minutes for us.
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*/
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static bool usart_wait_for_flag(QTestState *qts, uint32_t event_addr,
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uint32_t flag)
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{
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while (true) {
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if ((qtest_readl(qts, event_addr) & flag)) {
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return true;
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}
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g_usleep(1000);
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}
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return false;
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}
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static void usart_receive_string(QTestState *qts, int sock_fd, const char *in,
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char *out)
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{
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int i, in_len = strlen(in);
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g_assert_true(send(sock_fd, in, in_len, 0) == in_len);
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for (i = 0; i < in_len; i++) {
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g_assert_true(usart_wait_for_flag(qts,
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USART1_BASE_ADDR + A_ISR, R_ISR_RXNE_MASK));
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out[i] = qtest_readl(qts, USART1_BASE_ADDR + A_RDR);
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}
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out[i] = '\0';
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}
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static void usart_send_string(QTestState *qts, const char *in)
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{
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int i, in_len = strlen(in);
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for (i = 0; i < in_len; i++) {
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qtest_writel(qts, USART1_BASE_ADDR + A_TDR, in[i]);
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g_assert_true(usart_wait_for_flag(qts,
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USART1_BASE_ADDR + A_ISR, R_ISR_TXE_MASK));
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}
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}
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/* Init the RCC clocks to run at 80 MHz */
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static void init_clocks(QTestState *qts)
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{
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uint32_t value;
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/* MSIRANGE can be set only when MSI is OFF or READY */
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qtest_writel(qts, (RCC_BASE_ADDR + A_CR), R_CR_MSION_MASK);
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/* Clocking from MSI, in case MSI was not the default source */
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qtest_writel(qts, (RCC_BASE_ADDR + A_CFGR), 0);
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/*
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* Update PLL and set MSI as the source clock.
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* PLLM = 1 --> 000
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* PLLN = 40 --> 40
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* PPLLR = 2 --> 00
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* PLLDIV = unused, PLLP = unused (SAI3), PLLQ = unused (48M1)
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* SRC = MSI --> 01
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*/
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qtest_writel(qts, (RCC_BASE_ADDR + A_PLLCFGR), R_PLLCFGR_PLLREN_MASK |
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(40 << R_PLLCFGR_PLLN_SHIFT) |
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(0b01 << R_PLLCFGR_PLLSRC_SHIFT));
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/* PLL activation */
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value = qtest_readl(qts, (RCC_BASE_ADDR + A_CR));
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qtest_writel(qts, (RCC_BASE_ADDR + A_CR), value | R_CR_PLLON_MASK);
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/* RCC_CFGR is OK by defaut */
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qtest_writel(qts, (RCC_BASE_ADDR + A_CFGR), 0);
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/* CCIPR : no periph clock by default */
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qtest_writel(qts, (RCC_BASE_ADDR + A_CCIPR), 0);
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/* Switches on the PLL clock source */
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value = qtest_readl(qts, (RCC_BASE_ADDR + A_CFGR));
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qtest_writel(qts, (RCC_BASE_ADDR + A_CFGR), (value & ~R_CFGR_SW_MASK) |
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(0b11 << R_CFGR_SW_SHIFT));
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/* Enable SYSCFG clock enabled */
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qtest_writel(qts, (RCC_BASE_ADDR + A_APB2ENR), R_APB2ENR_SYSCFGEN_MASK);
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/* Enable the IO port B clock (See p.252) */
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qtest_writel(qts, (RCC_BASE_ADDR + A_AHB2ENR), R_AHB2ENR_GPIOBEN_MASK);
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/* Enable the clock for USART1 (cf p.259) */
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/* We rewrite SYSCFGEN to not disable it */
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qtest_writel(qts, (RCC_BASE_ADDR + A_APB2ENR),
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R_APB2ENR_SYSCFGEN_MASK | R_APB2ENR_USART1EN_MASK);
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/* TODO: Enable usart via gpio */
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/* Set PCLK as the clock for USART1(cf p.272) i.e. reset both bits */
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qtest_writel(qts, (RCC_BASE_ADDR + A_CCIPR), 0);
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/* Reset USART1 (see p.249) */
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qtest_writel(qts, (RCC_BASE_ADDR + A_APB2RSTR), 1 << 14);
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qtest_writel(qts, (RCC_BASE_ADDR + A_APB2RSTR), 0);
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}
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static void init_uart(QTestState *qts)
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{
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uint32_t cr1;
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init_clocks(qts);
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/*
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* For 115200 bauds, see p.1349.
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* The clock has a frequency of 80Mhz,
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* for 115200, we have to put a divider of 695 = 0x2B7.
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*/
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qtest_writel(qts, (USART1_BASE_ADDR + A_BRR), 0x2B7);
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/*
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* Set the oversampling by 16,
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* disable the parity control and
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* set the word length to 8. (cf p.1377)
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*/
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cr1 = qtest_readl(qts, (USART1_BASE_ADDR + A_CR1));
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cr1 &= ~(R_CR1_M1_MASK | R_CR1_M0_MASK | R_CR1_OVER8_MASK | R_CR1_PCE_MASK);
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qtest_writel(qts, (USART1_BASE_ADDR + A_CR1), cr1);
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/* Enable the transmitter, the receiver and the USART. */
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qtest_writel(qts, (USART1_BASE_ADDR + A_CR1),
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R_CR1_UE_MASK | R_CR1_RE_MASK | R_CR1_TE_MASK);
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}
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static void test_write_read(void)
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{
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QTestState *qts = qtest_init("-M b-l475e-iot01a");
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/* Test that we can write and retrieve a value from the device */
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qtest_writel(qts, USART1_BASE_ADDR + A_TDR, 0xFFFFFFFF);
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const uint32_t tdr = qtest_readl(qts, USART1_BASE_ADDR + A_TDR);
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g_assert_cmpuint(tdr, ==, 0x000001FF);
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}
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static void test_receive_char(void)
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{
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int sock_fd;
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uint32_t cr1;
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QTestState *qts = qtest_init_with_serial("-M b-l475e-iot01a", &sock_fd);
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init_uart(qts);
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/* Try without initializing IRQ */
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g_assert_true(send(sock_fd, "a", 1, 0) == 1);
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usart_wait_for_flag(qts, USART1_BASE_ADDR + A_ISR, R_ISR_RXNE_MASK);
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g_assert_cmphex(qtest_readl(qts, USART1_BASE_ADDR + A_RDR), ==, 'a');
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g_assert_false(check_nvic_pending(qts, USART1_IRQ));
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/* Now with the IRQ */
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cr1 = qtest_readl(qts, (USART1_BASE_ADDR + A_CR1));
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cr1 |= R_CR1_RXNEIE_MASK;
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qtest_writel(qts, USART1_BASE_ADDR + A_CR1, cr1);
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g_assert_true(send(sock_fd, "b", 1, 0) == 1);
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usart_wait_for_flag(qts, USART1_BASE_ADDR + A_ISR, R_ISR_RXNE_MASK);
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g_assert_cmphex(qtest_readl(qts, USART1_BASE_ADDR + A_RDR), ==, 'b');
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g_assert_true(check_nvic_pending(qts, USART1_IRQ));
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clear_nvic_pending(qts, USART1_IRQ);
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close(sock_fd);
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qtest_quit(qts);
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}
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static void test_send_char(void)
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{
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int sock_fd;
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char s[1];
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uint32_t cr1;
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QTestState *qts = qtest_init_with_serial("-M b-l475e-iot01a", &sock_fd);
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init_uart(qts);
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/* Try without initializing IRQ */
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qtest_writel(qts, USART1_BASE_ADDR + A_TDR, 'c');
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g_assert_true(recv(sock_fd, s, 1, 0) == 1);
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g_assert_cmphex(s[0], ==, 'c');
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g_assert_false(check_nvic_pending(qts, USART1_IRQ));
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/* Now with the IRQ */
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cr1 = qtest_readl(qts, (USART1_BASE_ADDR + A_CR1));
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cr1 |= R_CR1_TXEIE_MASK;
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qtest_writel(qts, USART1_BASE_ADDR + A_CR1, cr1);
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qtest_writel(qts, USART1_BASE_ADDR + A_TDR, 'd');
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g_assert_true(recv(sock_fd, s, 1, 0) == 1);
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g_assert_cmphex(s[0], ==, 'd');
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g_assert_true(check_nvic_pending(qts, USART1_IRQ));
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clear_nvic_pending(qts, USART1_IRQ);
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close(sock_fd);
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qtest_quit(qts);
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}
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static void test_receive_str(void)
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{
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int sock_fd;
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char s[10];
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QTestState *qts = qtest_init_with_serial("-M b-l475e-iot01a", &sock_fd);
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init_uart(qts);
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usart_receive_string(qts, sock_fd, "hello", s);
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g_assert_true(memcmp(s, "hello", 5) == 0);
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close(sock_fd);
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qtest_quit(qts);
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}
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static void test_send_str(void)
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{
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int sock_fd;
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char s[10];
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QTestState *qts = qtest_init_with_serial("-M b-l475e-iot01a", &sock_fd);
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init_uart(qts);
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usart_send_string(qts, "world");
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g_assert_true(recv(sock_fd, s, 10, 0) == 5);
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g_assert_true(memcmp(s, "world", 5) == 0);
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close(sock_fd);
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qtest_quit(qts);
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}
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int main(int argc, char **argv)
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{
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int ret;
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g_test_init(&argc, &argv, NULL);
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g_test_set_nonfatal_assertions();
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qtest_add_func("stm32l4x5/usart/write_read", test_write_read);
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qtest_add_func("stm32l4x5/usart/receive_char", test_receive_char);
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qtest_add_func("stm32l4x5/usart/send_char", test_send_char);
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qtest_add_func("stm32l4x5/usart/receive_str", test_receive_str);
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qtest_add_func("stm32l4x5/usart/send_str", test_send_str);
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ret = g_test_run();
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return ret;
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}
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