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-rw-r--r--CMakeLists.txt8
-rw-r--r--cmake/fiddle.cmake10
-rw-r--r--fdl/ch573/spi.fdl31
-rw-r--r--include/spi.h5
-rw-r--r--src/main.c41
-rw-r--r--src/spi.c62
6 files changed, 130 insertions, 27 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e53af7f..d20fe90 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,13 @@ set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
set(TC_PREFIX riscv32-picolibc-elf-)
# Set compiler and tools
set(CMAKE_C_COMPILER "${TC_PREFIX}gcc" CACHE INTERNAL "C Compiler")
-set(CMAKE_OBJCOPY "${TC_PREFIX}objcopy" CACHE INTERNAL "Object Copier")
+find_program(CMAKE_OBJCOPY "${TC_PREFIX}objcopy")
+
+if (CMAKE_OBJCOPY)
+ message(STATUS "Found objcopy at ${CMAKE_OBJCOPY}")
+else()
+ message(FATAL_ERROR "Could not find ${TC_PREFIX}objcopy.")
+endif()
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
file(REAL_PATH "stubs/libgloss_stub.c" LIBGLOSS_STUB)
diff --git a/cmake/fiddle.cmake b/cmake/fiddle.cmake
index 6b151a2..6830ce5 100644
--- a/cmake/fiddle.cmake
+++ b/cmake/fiddle.cmake
@@ -1,3 +1,11 @@
+find_program(FIDDLEC "fiddlec")
+
+if (FIDDLEC)
+ message (STATUS "Found fiddlec at ${FIDDLEC}")
+else()
+ message (FATAL_ERROR "Could not find fiddlec. Please download and build it at git@git.josher.dev:fiddle.git")
+endif()
+
function(add_fiddle_source header_out fdl_file)
get_filename_component(dir_path ${fdl_file} DIRECTORY)
get_filename_component(file_name_without_extension ${fdl_file} NAME_WE)
@@ -13,7 +21,7 @@ function(add_fiddle_source header_out fdl_file)
DEPENDS ${fdl_file}
COMMENT "Fiddle compile ${fdl_file} -> ${output_header}"
COMMAND ${CMAKE_COMMAND} -E make_directory "${output_dir}"
- COMMAND fiddlec -Lc -h ${output_header} -I ${CMAKE_SOURCE_DIR}/fdl/ --intf-dir ${CMAKE_BINARY_DIR}/fdli/ ${CMAKE_SOURCE_DIR}/${fdl_file}
+ COMMAND ${FIDDLEC} -Lc -h ${output_header} -I ${CMAKE_SOURCE_DIR}/fdl/ --intf-dir ${CMAKE_BINARY_DIR}/fdli/ ${CMAKE_SOURCE_DIR}/${fdl_file}
)
# Make the output header file available as a source file for the target
diff --git a/fdl/ch573/spi.fdl b/fdl/ch573/spi.fdl
index 855d17f..cec88f3 100644
--- a/fdl/ch573/spi.fdl
+++ b/fdl/ch573/spi.fdl
@@ -8,6 +8,7 @@ package ch573.spi {
using ch573.common;
type spi_t : struct {
+ assert_pos(0x0);
/** SPI0 Control Mode Register */
reg ctrl_mod(8) : struct {
/** SPI master/slave mode select */
@@ -18,18 +19,32 @@ package ch573.spi {
wire_2_mod : bit_t;
union {
/** Clock idle mode select in master mode */
- mst_sck_mod : bit_t;
+ mst_sck_mod : enum(1) {
+ [[ c: unqualified ]]
+ CLOCK_IDLE_LOW = 0,
+
+ [[ c: unqualified ]]
+ CLOCK_IDLE_HIGH = 1,
+ };
/** First byte command mode select in slave mode */
slv_cmd_mod : bit_t;
};
/** FIFO direction setting bit */
- fifo_dir : bit_t;
- /** SCK output enable bit */
- sck_oe : bit_t;
- /** MOSI output enable bit */
- mosi_oe : bit_t;
- /** MISO output enable bit */
- miso_oe : bit_t;
+ fifo_dir : enum(1) {
+ [[ c: unqualified ]]
+ FIFO_DIR_INPUT = 1,
+
+ [[ c: unqualified ]]
+ FIFO_DIR_OUTPUT = 0,
+ };
+ struct {
+ /** SCK output enable bit */
+ sck_oe : enable_t;
+ /** MOSI output enable bit */
+ mosi_oe : enable_t;
+ /** MISO output enable bit */
+ miso_oe : enable_t;
+ } pin_enable;
};
/** SPI0 Control Configuration Register */
diff --git a/include/spi.h b/include/spi.h
new file mode 100644
index 0000000..65e3a9d
--- /dev/null
+++ b/include/spi.h
@@ -0,0 +1,5 @@
+#pragma once
+
+void enable_spi(void);
+
+void run_spi(void);
diff --git a/src/main.c b/src/main.c
index f06a775..8bf8e15 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,6 +5,7 @@
#include "ch573/pwr.h"
#include "ch573/uart.h"
#include "clock.h"
+#include "spi.h"
#include "system.h"
#define GPIO_PORT_A ch573_gpio__gpio_port_a
@@ -124,28 +125,34 @@ static void fast_delay()
*/
int main(void)
{
- GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, 8);
- GPIO_PORT.pd_drv.set(GPIO_PORT_A, 0, 8);
- GPIO_PORT.out.set(GPIO_PORT_A, OFF, 8);
+ printf("Running SPI.\n");
- GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, 11);
- GPIO_PORT.pd_drv.set(GPIO_PORT_A, 0, 11);
+ enable_spi();
- GPIO_PORT.dir.set(GPIO_PORT_A, DIR_IN, 10);
- GPIO_PORT.pd_drv.set(GPIO_PORT_A, PD_DRV_OPEN_DRAIN, 11);
+ run_spi();
- set_system_clock_6Mhz();
- uint32_t reg = (*(uint32_t*)0x40001008);
- reg &= ~0x1f;
- reg |= 10;
- enter_safe_mode();
- (*(uint32_t*)0x40001008) = reg;
+ // GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, 8);
+ // GPIO_PORT.pd_drv.set(GPIO_PORT_A, 0, 8);
+ // GPIO_PORT.out.set(GPIO_PORT_A, OFF, 8);
+ // GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, 11);
+ // GPIO_PORT.pd_drv.set(GPIO_PORT_A, 0, 11);
- for (int i = 0;; ++i) {
- GPIO_PORT.out.set(GPIO_PORT_A, ON, 8);
- GPIO_PORT.out.set(GPIO_PORT_A, OFF, 8);
- }
+ // GPIO_PORT.dir.set(GPIO_PORT_A, DIR_IN, 10);
+ // GPIO_PORT.pd_drv.set(GPIO_PORT_A, PD_DRV_OPEN_DRAIN, 11);
+
+ // set_system_clock_6Mhz();
+ // uint32_t reg = (*(uint32_t*)0x40001008);
+ // reg &= ~0x1f;
+ // reg |= 10;
+ // enter_safe_mode();
+ // (*(uint32_t*)0x40001008) = reg;
+
+
+ // for (int i = 0;; ++i) {
+ // GPIO_PORT.out.set(GPIO_PORT_A, ON, 8);
+ // GPIO_PORT.out.set(GPIO_PORT_A, OFF, 8);
+ // }
// clock_cfg_t cfg;
// for (int i = 0;; ++i) {
diff --git a/src/spi.c b/src/spi.c
new file mode 100644
index 0000000..3105f1b
--- /dev/null
+++ b/src/spi.c
@@ -0,0 +1,62 @@
+#include "spi.h"
+
+#include <stdio.h>
+
+#include "ch573/gpio.h"
+#include "ch573/spi.h"
+
+#define SPI CH573_SPI__SPI_T_INTF
+#define SPI0 ch573_spi__spi0
+
+#define GPIO_PORT_A ch573_gpio__gpio_port_a
+#define GPIO_PORT_B ch573_gpio__gpio_port_b
+#define GPIO_PORT CH573_GPIO__GPIO_PORT_T_INTF
+
+#define GPIO_I CH573_GPIO__GPIO_T_INTF
+#define GPIO ch573_gpio__gpio
+
+void enable_spi(void)
+{
+ GPIO_I.pin_alternate.pin_spi0.set(GPIO, OFF);
+
+ GPIO_PORT.out.set(GPIO_PORT_A, ON, 12);
+ GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, 12);
+ GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, 14);
+ GPIO_PORT.pd_drv.set(GPIO_PORT_A, 0, 12);
+ GPIO_PORT.pd_drv.set(GPIO_PORT_A, 0, 14);
+
+ GPIO_PORT.dir.set(GPIO_PORT_B, DIR_OUT, 12);
+ GPIO_PORT.dir.set(GPIO_PORT_B, DIR_OUT, 14);
+ GPIO_PORT.pd_drv.set(GPIO_PORT_B, 0, 12);
+ GPIO_PORT.pd_drv.set(GPIO_PORT_B, 0, 14);
+ GPIO_PORT.out.set(GPIO_PORT_B, OFF, 14);
+ GPIO_PORT.out.set(GPIO_PORT_B, ON, 12);
+
+ GPIO_PORT.dir.set(GPIO_PORT_B, DIR_IN, 13);
+ GPIO_PORT.dir.set(GPIO_PORT_B, DIR_IN, 15);
+ GPIO_PORT.dir.set(GPIO_PORT_A, DIR_IN, 13);
+ GPIO_PORT.dir.set(GPIO_PORT_A, DIR_IN, 15);
+
+ SPI.clock_div.set(SPI0, 16);
+ SPI.ctrl_mod.all_clear.set(SPI0, 1);
+ // SPI.ctrl_mod.set(SPI0, 0xe0); // Set mosi and sck
+
+ SPI.ctrl_mod.all_clear.set(SPI0, 0);
+ SPI.ctrl_mod.pin_enable.set(SPI0, 0x7); // Set mosi and sck
+ SPI.ctrl_cfg.auto_if.set(SPI0, 1);
+ SPI.ctrl_cfg.dma_enable.set(SPI0, OFF);
+}
+
+void run_spi(void)
+{
+ GPIO_PORT.out.set(GPIO_PORT_A, ON, 12);
+ while (1) {
+ GPIO_PORT_A->clr |= 1 << 12;
+ SPI.ctrl_mod.fifo_dir.set(SPI0, FIFO_DIR_OUTPUT);
+ // R8_SPI0_CTRL_MOD &= ~RB_SPI_FIFO_DIR;
+ SPI.data_buf.set(SPI0, 0xaa);
+ // R8_SPI0_BUFFER = 0xaa;
+ while (!SPI.int_flag.free.get(SPI0));
+ GPIO_PORT.out.set(GPIO_PORT_A, ON, 12);
+ }
+}
generated by cgit (git 2.34.1) at 2025-07-05 10:42:55 +0000