From 45aa04f4acda9d4e67eedef84bb2b8e87994f999 Mon Sep 17 00:00:00 2001
From: Joey Castillo <joeycastillo@utexas.edu>
Date: Thu, 27 Jan 2022 14:28:37 -0500
Subject: spi test: set first 4096 bytes to 0

---
 apps/spi-test/app.c | 44 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 33 insertions(+), 11 deletions(-)

(limited to 'apps')

diff --git a/apps/spi-test/app.c b/apps/spi-test/app.c
index fc78bbc5..006067a4 100644
--- a/apps/spi-test/app.c
+++ b/apps/spi-test/app.c
@@ -6,15 +6,30 @@
 
 // this is a very basic app to confirm that SPI is working, tested with board OSO-MISC-21-017 and a GD25Q16C Flash chip.
 
+static bool wait_for_flash_ready(void) {
+    watch_set_pin_level(A3, false);
+    bool ok = true;
+    uint8_t read_status_response[1] = {0x00};
+    do {
+        ok = spi_flash_read_command(CMD_READ_STATUS, read_status_response, 1);
+    } while (ok && (read_status_response[0] & 0x3) != 0);
+    watch_set_pin_level(A3, true);
+    return ok;
+}
+
 void app_init(void) {
     spi_flash_init();
+    delay_ms(5000);
 
-    uint8_t buf[3] = {1, 2, 3};
-    watch_set_pin_level(A3, false);
-    spi_flash_command(CMD_ENABLE_WRITE);
-    watch_set_pin_level(A3, true);
-    // note that you will need to erase the sector to write different values later
-    spi_flash_write_data(0, buf, 3);
+    uint8_t buf[256] = {0};
+    for(int i = 1; i < 16; i++) {
+        wait_for_flash_ready();
+        watch_set_pin_level(A3, false);
+        spi_flash_command(CMD_ENABLE_WRITE);
+        watch_set_pin_level(A3, true);
+        wait_for_flash_ready();
+        spi_flash_write_data(i * 256, buf, 256);
+    }
 }
 
 void app_wake_from_backup(void) {
@@ -31,13 +46,20 @@ void app_wake_from_standby(void) {
 
 
 bool app_loop(void) {
-    uint8_t buf[3] = {0};
+    uint8_t buf[4100] = {0};
+    printf("loop\n");
 
-    // should print 1, 2, 3
-    spi_flash_read_data(0, buf, 3);
-    printf("data: %x, %x, %x\n", buf[0], buf[1], buf[2]);
+    wait_for_flash_ready();
+    spi_flash_read_data(0, buf, 4100);
+    for(int i = 0; i < 4100; i++) {
+        if (buf[i] > 0) {
+            // should break at "byte 4096 is 255"
+            printf("    byte %d is %d!\n", i, buf[i]);
+            break;
+        }
+    }
 
-    delay_ms(100);
+    delay_ms(10000);
 
     return false;
 }
-- 
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