nrf52820_hic: update to nrfx v2.5.0 (2/3)

Update flash.c to new nrf_nmvc API

Author: mbrossard

source/hic_hal/nordic/nrf52820/flash.c

@@ -20,7 +20,6 @@
  */
 
 #include "target_config.h"
-
 #include "nrf_nvmc.h"
 
 uint32_t Init(uint32_t adr, uint32_t clk, uint32_t fnc)
@@ -40,12 +39,26 @@ uint32_t EraseChip(void)
 
 uint32_t EraseSector(uint32_t adr)
 {
-    nrf_nvmc_page_erase(adr);
+    nrf_nvmc_mode_set(NRF_NVMC, NRF_NVMC_MODE_ERASE);
+    nrf_nvmc_page_erase_start(NRF_NVMC, adr);
+    while (!nrf_nvmc_ready_check(NRF_NVMC)) {
+        // Wait for controller to be ready
+    }
+    nrf_nvmc_mode_set(NRF_NVMC, NRF_NVMC_MODE_READONLY);
+
     return 0;
 }
 
 uint32_t ProgramPage(uint32_t adr, uint32_t sz, uint32_t *buf)
 {
-    nrf_nvmc_write_words(adr, buf, sz / 4);
+    nrf_nvmc_mode_set(NRF_NVMC, NRF_NVMC_MODE_WRITE);
+    for (uint32_t i = 0; i < sz / 4; i++) {
+        ((volatile uint32_t *)adr)[i] = buf[i];
+        while (!nrf_nvmc_ready_check(NRF_NVMC)) {
+            // Wait for controller to be ready
+        }
+    }
+    nrf_nvmc_mode_set(NRF_NVMC, NRF_NVMC_MODE_READONLY);
+
     return 0;
 }