altos/stm32f1: Add eeprom emulation using flash

[fw/altos] / src / stm32f1 / ao_flash_stm.c

diff --git a/src/stm32f1/ao_flash_stm.c b/src/stm32f1/ao_flash_stm.c
index 48c702f7a8d893a9e5af316d5323610326846b75..103e83a5e4b1df5892992736bbfe7d6aa124ef23 100644 (file)
--- a/src/stm32f1/ao_flash_stm.c
+++ b/src/stm32f1/ao_flash_stm.c
@@ -104,13 +104,13 @@ ao_flash_erase_page(uint32_t *page)
 }
 
 static void __attribute__ ((section(".sdata2.flash"), noinline))
-_ao_flash_page(uint16_t *dst, uint16_t *src)
+_ao_flash_page(uint16_t *dst, uint16_t *src, unsigned int shorts)
 {
        uint8_t         i;
 
        stm_flash.cr |= (1 << STM_FLASH_CR_PG);
 
-       for (i = 0; i < 128; i++) {
+       for (i = 0; i < shorts; i++) {
                *dst++ = *src++;
                ao_flash_wait_bsy();
        }
@@ -126,7 +126,24 @@ ao_flash_page(uint32_t *page, uint32_t *src)
        ao_arch_block_interrupts();
        ao_flash_unlock();
 
-       _ao_flash_page((uint16_t *) page, (uint16_t *) src);
+       _ao_flash_page((uint16_t *) page, (uint16_t *) src, 128);
+
+       ao_flash_lock();
+       ao_arch_release_interrupts();
+}
+
+/* Stores less than a full page while still smashing the full page */
+void
+ao_flash_bytes(void *page, void *src, size_t size)
+{
+       unsigned int shorts = (unsigned int) ((size + 1) >> 1);
+
+       ao_flash_erase_page(page);
+
+       ao_arch_block_interrupts();
+       ao_flash_unlock();
+
+       _ao_flash_page((uint16_t *) page, (uint16_t *) src, shorts);
 
        ao_flash_lock();
        ao_arch_release_interrupts();