spi-master: initial busy sending test stub.

Basic framework.  now we can build on it.

tests/spi-master/Makefile.stm32l1-generic

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+BOARD = stm32l1-generic
+PROJECT = spi-master-$(BOARD)
+BUILD_DIR = bin-$(BOARD)
+
+SHARED_DIR = ../../shared
+
+CFILES = main-$(BOARD).c
+#CFILES += spi-master.c
+CFILES += trace.c trace_stdio.c
+
+VPATH += $(SHARED_DIR)
+
+INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR))
+
+OPENCM3_DIR=../../libopencm3
+DEVICE=stm32l151xb
+OOCD_FILE = openocd.stm32l1-generic.cfg
+include ../../rules.mk

tests/spi-master/README.md

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+SPI master mode tests
+
+While some of the disco boards have some form of spi device onboard,
+which would, on the face of it, make testing easy, it's a different
+device on each board, and there are boards without it.
+
+Instead, use a known SPI peripheral on all boards, and require/expect
+a known fixed SPI slave device.  Use a soft controller SPI slave device
+for the far side, for double the test coverage!
+
+the "trigger" pin is bounced when each iteration of the test code starts,
+allowing synchronization with a sigrok script that helps assure that
+results are as expected.
+
+Debug is via SWO wherever possible, PA2 (tx only) on less capable cores
+
+Pinouts:
+		(red)  (orange) (yellow)(brown)		(black)
+board		SCK	MISO	MOSI	CS	periph	trigger
+f4-disco	PB13	PB14	PB15	PB12	spi2	PB11
+l1-disco	PB13	PB14	PB15	PB12	spi2	PB11
+
+
+Notes for monitoring with sigrok:
+$ sigrok-cli -d fx2lafw -C D0=TRIG,D1=CS,D2=CLK,D3=MISO,D4=MOSI -c samplerate=12Mhz:captureratio=4 --time=150ms  -t TRIG=r -P spi:clk=CLK:miso=MISO:mosi=MOSI -l 4 2>/dev/null | grep -- -data

tests/spi-master/hw.h

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+/*
+ * March 2017 Karl Palsson <karlp@tweak.net.au>
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#pragma once
+
+struct hw_detail
+{
+       uint32_t periph; /* eg: SPI2 */
+       uint32_t periph_rcc; /* eg: RCC_SPI2 */
+       uint32_t periph_rst; /* eg: RST_SPI2 */
+       uint32_t pins; /* to set to the AF for the periph */
+       uint32_t port; /* eg GPIOB */
+       uint32_t port_rcc; /* for the gpio pins */
+       uint32_t trigger_rcc;
+       uint32_t trigger_port;
+       uint32_t trigger_pin;
+};
+
+extern struct hw_detail hw_details;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+        * Expected to setup clocks, turn on all peripherals, and configure
+        * any gpios necessary.
+        * @param hw pointer to hw details necessary
+        */
+       void hw_setup(struct hw_detail* hw);
+
+       /* let devices have a status led */
+       void hw_set_led(bool val);
+
+#ifdef __cplusplus
+}
+#endif

tests/spi-master/main-stm32l1-generic.c

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+/*
+ * March 2017 Karl Palsson <karlp@tweak.net.au>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/spi.h>
+#include <libopencm3/stm32/rcc.h>
+
+#include "trace.h"
+
+#include "hw.h"
+//#include "i2c-master.h"
+
+#define LED_DISCO_GREEN_PORT GPIOB
+#define LED_DISCO_GREEN_PIN GPIO7
+
+
+struct hw_detail hw_details = {
+	.periph = SPI2,
+	.periph_rcc = RCC_SPI2,
+	.periph_rst = RST_SPI2,
+	.pins = GPIO13| GPIO14 | GPIO15, /* SPI pins for setting AF with */
+	.port = GPIOB,
+	.port_rcc = RCC_GPIOB,
+	.trigger_rcc = RCC_GPIOB,
+	.trigger_port = GPIOB,
+	.trigger_pin = GPIO11,
+};
+
+
+/* provided in board files please*/
+/**
+ * Setup any gpios or anything hardware specific.
+ * Should _only_ be things that can't be done in shared init()
+ */
+static void hw_init(void)
+{
+	/* trigger pin gpio */
+	rcc_periph_clock_enable(hw_details.trigger_rcc);
+	gpio_mode_setup(hw_details.trigger_port, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, hw_details.trigger_pin);
+
+	/* spi control lines */
+	rcc_periph_clock_enable(hw_details.port_rcc);
+	gpio_mode_setup(hw_details.port, GPIO_MODE_AF, GPIO_PUPD_NONE, hw_details.pins);
+	gpio_set_output_options(hw_details.port, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, hw_details.pins);
+	gpio_set_af(hw_details.port, GPIO_AF5, hw_details.pins);
+}
+
+static void test_init(void)
+{
+        /* Setup SPI parameters. */
+	rcc_periph_clock_enable(hw_details.periph_rcc);
+        spi_init_master(hw_details.periph, SPI_CR1_BAUDRATE_FPCLK_DIV_16, SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE,
+                SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
+        /* Ignore the stupid NSS pin. */
+        spi_enable_software_slave_management(hw_details.periph);
+        //spi_enable_ss_output(MRF_SPI);
+        spi_set_nss_high(hw_details.periph);
+        /* Finally enable the SPI. */
+        spi_enable(hw_details.periph);
+}
+
+static void test_task(void) {
+	static int i = 0;
+	printf("Test iteration %d\n", i++);
+	gpio_set(hw_details.trigger_port, hw_details.trigger_pin);
+	spi_xfer(hw_details.periph, 0xaa);
+	spi_xfer(hw_details.periph, 0x42);
+	spi_xfer(hw_details.periph, 0x69);
+	gpio_clear(hw_details.trigger_port, hw_details.trigger_pin);
+}
+
+static void setup(void)
+{
+	printf("hi guys!\n");
+	hw_init();
+	test_init();
+}
+
+
+int main(void)
+{
+	int i, j;
+	rcc_clock_setup_pll(&rcc_clock_config[RCC_CLOCK_VRANGE1_HSI_PLL_32MHZ]);
+	/* green led for ticking */
+	rcc_periph_clock_enable(RCC_GPIOB);
+	gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
+		LED_DISCO_GREEN_PIN);
+	setup();
+
+	while (1) {
+		test_task();
+		gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
+		for (i = 0; i < 0x800000; i++) { /* Wait a bit. */
+                        __asm__("NOP");
+                }
+	}
+	return 0;
+}