uart-basic: add functional l0 test code too.

Really need to get the rcc helpers built up and upstream!

1 files changed, 90 insertions, 0 deletions

diff --git a/tests/uart-basic/main-stm32l053disco.c b/tests/uart-basic/main-stm32l053disco.c
new file mode 100644
index 0000000..40b7682
--- /dev/null
+++ b/tests/uart-basic/main-stm32l053disco.c
@@ -0,0 +1,90 @@
+/*
+ * Oct 2017 Karl Palsson <karlp@tweak.net.au>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/crs.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/syscfg.h>
+#include <libopencm3/stm32/usart.h>
+
+#include "uart-basic.h"
+
+#define LED_DISCO_GREEN_RCC RCC_GPIOB
+#define LED_DISCO_GREEN_PORT GPIOB
+#define LED_DISCO_GREEN_PIN GPIO4
+
+void usart1_isr(void)
+{
+	ub_irq_handler();
+}
+
+static void setup_rcc_hack(void)
+{
+	/* FIXME L0 doesn't have rcc setup helpers (yet) */
+	rcc_osc_on(RCC_HSI16);
+	rcc_wait_for_osc_ready(RCC_HSI16);
+	rcc_set_sysclk_source(RCC_HSI16);
+
+	/* HSI48 needs the vrefint turned on */
+	rcc_periph_clock_enable(RCC_SYSCFG);
+	SYSCFG_CFGR3 |= SYSCFG_CFGR3_ENREF_HSI48 | SYSCFG_CFGR3_EN_VREFINT;
+	while (!(SYSCFG_CFGR3 & SYSCFG_CFGR3_REF_HSI48_RDYF));
+
+	/* For USB, but can't use HSI48 as a sysclock on L0 */
+	crs_autotrim_usb_enable();
+	rcc_set_hsi48_source_rc48();
+
+	rcc_osc_on(RCC_HSI48);
+	rcc_wait_for_osc_ready(RCC_HSI48);
+
+	/* ok, we manually poked around, let the lib know */
+	rcc_apb1_frequency = rcc_apb2_frequency = 16e6;
+}
+
+static void board_init(void)
+{
+	rcc_periph_clock_enable(RCC_GPIOA);
+	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9 | GPIO10);
+	/* usart1 is AF4 */
+	gpio_set_af(GPIOA, GPIO_AF4, GPIO9 | GPIO10);
+}
+
+int main(void)
+{
+	int i;
+	int j = 0;
+	setup_rcc_hack();
+	board_init();
+	struct ub_hw ub = {
+		.uart = USART1,
+		.uart_nvic = NVIC_USART1_IRQ,
+		.uart_rcc = RCC_USART1,
+	};
+	ub_init(&ub);
+	printf("hi guys!\n");
+	/* green led for ticking */
+	rcc_periph_clock_enable(LED_DISCO_GREEN_RCC);
+	gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
+		LED_DISCO_GREEN_PIN);
+
+
+	while (1) {
+		gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
+
+		for (i = 0; i < 0xa0000; i++) { /* Wait a bit. */
+			__asm__("NOP");
+		}
+		ub_task();
+		gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
+		for (i = 0; i < 0xa0000; i++) { /* Wait a bit. */
+			__asm__("NOP");
+		}
+	}
+
+	return 0;
+}