implement SPI flash chip

apps/spi-test/app.c

@@ -2,11 +2,20 @@
 #include <string.h>
 #include <peripheral_clk_config.h>
 #include "watch.h"
+#include "spiflash.h"
 
 // this is a very basic app to confirm that SPI is working, tested with board OSO-MISC-21-017 and a GD25Q16C Flash chip.
 
 void app_init(void) {
-    watch_enable_spi();
+    spi_flash_init();
+
+    uint8_t buf[3] = {1, 2, 3};
+    flash_enable();
+    spi_flash_command(CMD_ENABLE_WRITE);
+    // note that you will need to erase the sector to write different values later:
+    // spi_flash_sector_command(CMD_SECTOR_ERASE, 0);
+    spi_flash_write_data(0, buf, 3);
+    flash_disable();
 }
 
 void app_wake_from_backup(void) {
@@ -23,20 +32,13 @@ void app_wake_from_standby(void) {
 
 
 bool app_loop(void) {
-    uint8_t get_id_command[1] = {0x9F};
     uint8_t buf[3] = {0};
 
-    watch_set_pin_level(A3, false);
-
-    // should print 0, 0, 0
-    watch_spi_send(get_id_command, 1);
-    printf("blank: %x, %x, %x\n", buf[0], buf[1], buf[2]);
-
-    // should print c8, 40, 15
-    watch_spi_receive(buf, 3);
-    printf("ident: %x, %x, %x\n", buf[0], buf[1], buf[2]);
-
-    watch_set_pin_level(A3, true);
+    flash_enable();
+    // should print 1, 2, 3
+    spi_flash_read_data(0, buf, 3);
+    printf("data: %x, %x, %x\n", buf[0], buf[1], buf[2]);
+    flash_disable();
 
     delay_ms(100);
 

apps/spi-test/watch_spi.c

@@ -0,0 +1,46 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "watch_spi.h"
+
+struct io_descriptor *spi_io;
+
+void watch_enable_spi(void) {
+    SPI_0_init();
+    spi_m_sync_get_io_descriptor(&SPI_0, &spi_io);
+    spi_m_sync_enable(&SPI_0);
+}
+
+void watch_disable_spi(void) {
+    spi_m_sync_disable(&SPI_0);
+    spi_io = NULL;
+}
+
+void watch_spi_read(const uint8_t *buf, uint16_t length) {
+	io_write(spi_io, buf, length);
+}
+
+void watch_spi_read(uint8_t *buf, uint16_t length) {
+	io_read(spi_io, buf, length);
+}